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skia / external / github.com / rive-app / rive-cpp / 9c2eeb35dbfa91f4ecbcd4a6dfbd346ef38fe62f / . / renderer / gl / pls_render_context_gl_impl.cpp
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/*
* Copyright 2022 Rive
*/
#include "rive/pls/gl/pls_render_context_gl_impl.hpp"
#include "rive/pls/gl/pls_render_buffer_gl_impl.hpp"
#include "rive/pls/gl/pls_render_target_gl.hpp"
#include "rive/pls/pls_draw.hpp"
#include "rive/pls/pls_image.hpp"
#include "shaders/constants.glsl"
#include "shaders/out/generated/advanced_blend.glsl.hpp"
#include "shaders/out/generated/color_ramp.glsl.hpp"
#include "shaders/out/generated/constants.glsl.hpp"
#include "shaders/out/generated/common.glsl.hpp"
#include "shaders/out/generated/draw_path_common.glsl.hpp"
#include "shaders/out/generated/draw_path.glsl.hpp"
#include "shaders/out/generated/draw_image_mesh.glsl.hpp"
#include "shaders/out/generated/tessellate.glsl.hpp"
#include "shaders/out/generated/blit_texture_as_draw.glsl.hpp"
#include "shaders/out/generated/stencil_draw.glsl.hpp"
#ifdef RIVE_WEBGL
// In an effort to save space on web, and since web doesn't have ES 3.1 level support, don't include
// the atomic sources.
namespace rive::pls::glsl
{
const char atomic_draw[] = "";
}
#define DISABLE_PLS_ATOMICS
#else
#include "shaders/out/generated/atomic_draw.glsl.hpp"
#endif
#ifdef RIVE_WEBGL
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
// Emscripten has a bug with glTexSubImage2D when a PIXEL_UNPACK_BUFFER is bound. Make the call
// ourselves directly.
EM_JS(void,
webgl_texSubImage2DWithOffset,
(EMSCRIPTEN_WEBGL_CONTEXT_HANDLE gl,
GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
GLintptr offset),
{
gl = GL.getContext(gl).GLctx;
gl.texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, offset);
});
#endif
// Offset all PLS texture indices by 1 so we, and others who share our GL context, can use
// GL_TEXTURE0 as a scratch texture index.
constexpr static int kPLSTexIdxOffset = 1;
namespace rive::pls
{
PLSRenderContextGLImpl::PLSRenderContextGLImpl(const char* rendererString,
GLCapabilities capabilities,
std::unique_ptr<PLSImpl> plsImpl) :
m_capabilities(capabilities),
m_plsImpl(std::move(plsImpl)),
m_state(make_rcp<GLState>(m_capabilities))
{
m_platformFeatures.supportsPixelLocalStorage = m_plsImpl != nullptr;
m_platformFeatures.supportsRasterOrdering = m_platformFeatures.supportsPixelLocalStorage &&
m_plsImpl->supportsRasterOrdering(m_capabilities);
if (m_capabilities.KHR_blend_equation_advanced_coherent)
{
m_platformFeatures.supportsKHRBlendEquations = true;
}
if (m_capabilities.EXT_clip_cull_distance)
{
m_platformFeatures.supportsClipPlanes = true;
}
if (m_capabilities.ARB_bindless_texture)
{
m_platformFeatures.supportsBindlessTextures = true;
}
if (strstr(rendererString, "Apple") && strstr(rendererString, "Metal"))
{
// In Metal, non-flat varyings preserve their exact value if all vertices in the triangle
// emit the same value, and we also see a small (5-10%) improvement from not using flat
// varyings.
m_platformFeatures.avoidFlatVaryings = true;
}
m_platformFeatures.fragCoordBottomUp = true;
std::vector<const char*> generalDefines;
if (!m_capabilities.ARB_shader_storage_buffer_object)
{
generalDefines.push_back(GLSL_DISABLE_SHADER_STORAGE_BUFFERS);
}
const char* colorRampSources[] = {glsl::constants, glsl::common, glsl::color_ramp};
m_colorRampProgram.compileAndAttachShader(GL_VERTEX_SHADER,
generalDefines.data(),
generalDefines.size(),
colorRampSources,
std::size(colorRampSources),
m_capabilities);
m_colorRampProgram.compileAndAttachShader(GL_FRAGMENT_SHADER,
generalDefines.data(),
generalDefines.size(),
colorRampSources,
std::size(colorRampSources),
m_capabilities);
m_colorRampProgram.link();
glUniformBlockBinding(m_colorRampProgram,
glGetUniformBlockIndex(m_colorRampProgram, GLSL_FlushUniforms),
FLUSH_UNIFORM_BUFFER_IDX);
m_state->bindVAO(m_colorRampVAO);
glEnableVertexAttribArray(0);
glVertexAttribDivisor(0, 1);
const char* tessellateSources[] = {glsl::constants, glsl::common, glsl::tessellate};
m_tessellateProgram.compileAndAttachShader(GL_VERTEX_SHADER,
generalDefines.data(),
generalDefines.size(),
tessellateSources,
std::size(tessellateSources),
m_capabilities);
m_tessellateProgram.compileAndAttachShader(GL_FRAGMENT_SHADER,
generalDefines.data(),
generalDefines.size(),
tessellateSources,
std::size(tessellateSources),
m_capabilities);
m_tessellateProgram.link();
m_state->bindProgram(m_tessellateProgram);
glUniformBlockBinding(m_tessellateProgram,
glGetUniformBlockIndex(m_tessellateProgram, GLSL_FlushUniforms),
FLUSH_UNIFORM_BUFFER_IDX);
if (!m_capabilities.ARB_shader_storage_buffer_object)
{
// Our GL driver doesn't support storage buffers. We polyfill these buffers as textures.
glUniform1i(glGetUniformLocation(m_tessellateProgram, GLSL_pathBuffer),
kPLSTexIdxOffset + PATH_BUFFER_IDX);
glUniform1i(glGetUniformLocation(m_tessellateProgram, GLSL_contourBuffer),
kPLSTexIdxOffset + CONTOUR_BUFFER_IDX);
}
m_state->bindVAO(m_tessellateVAO);
for (int i = 0; i < 4; ++i)
{
glEnableVertexAttribArray(i);
// Draw two instances per TessVertexSpan: one normal and one optional reflection.
glVertexAttribDivisor(i, 1);
}
m_state->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_tessSpanIndexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(pls::kTessSpanIndices),
pls::kTessSpanIndices,
GL_STATIC_DRAW);
m_state->bindVAO(m_drawVAO);
PatchVertex patchVertices[kPatchVertexBufferCount];
uint16_t patchIndices[kPatchIndexBufferCount];
GeneratePatchBufferData(patchVertices, patchIndices);
m_state->bindBuffer(GL_ARRAY_BUFFER, m_patchVerticesBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(patchVertices), patchVertices, GL_STATIC_DRAW);
m_state->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_patchIndicesBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(patchIndices), patchIndices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(PatchVertex), nullptr);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1,
4,
GL_FLOAT,
GL_FALSE,
sizeof(PatchVertex),
reinterpret_cast<const void*>(sizeof(float) * 4));
m_state->bindVAO(m_trianglesVAO);
glEnableVertexAttribArray(0);
if (!m_capabilities.ARB_bindless_texture)
{
// We only have to draw imageRects when in atomic mode and bindless textures are not
// supported.
m_state->bindVAO(m_imageRectVAO);
m_state->bindBuffer(GL_ARRAY_BUFFER, m_imageRectVertexBuffer);
glBufferData(GL_ARRAY_BUFFER,
sizeof(pls::kImageRectVertices),
pls::kImageRectVertices,
GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(pls::ImageRectVertex), nullptr);
m_state->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_imageRectIndexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(pls::kImageRectIndices),
pls::kImageRectIndices,
GL_STATIC_DRAW);
}
m_state->bindVAO(m_imageMeshVAO);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
if (m_plsImpl != nullptr)
{
m_plsImpl->init(m_state);
}
}
PLSRenderContextGLImpl::~PLSRenderContextGLImpl()
{
glDeleteTextures(1, &m_gradientTexture);
glDeleteTextures(1, &m_tessVertexTexture);
// Because glutils wrappers delete GL objects that might affect bindings.
m_state->invalidate();
}
void PLSRenderContextGLImpl::invalidateGLState()
{
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + TESS_VERTEX_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, m_tessVertexTexture);
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + GRAD_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, m_gradientTexture);
m_state->invalidate();
}
void PLSRenderContextGLImpl::unbindGLInternalResources()
{
m_state->bindVAO(0);
m_state->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
m_state->bindBuffer(GL_ARRAY_BUFFER, 0);
m_state->bindBuffer(GL_UNIFORM_BUFFER, 0);
m_state->bindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
for (int i = 0; i <= CONTOUR_BUFFER_IDX; ++i)
{
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + i);
glBindTexture(GL_TEXTURE_2D, 0);
}
}
rcp<RenderBuffer> PLSRenderContextGLImpl::makeRenderBuffer(RenderBufferType type,
RenderBufferFlags flags,
size_t sizeInBytes)
{
return make_rcp<PLSRenderBufferGLImpl>(type, flags, sizeInBytes, m_state);
}
class PLSTextureGLImpl : public PLSTexture
{
public:
PLSTextureGLImpl(uint32_t width,
uint32_t height,
GLuint textureID,
const GLCapabilities& capabilities) :
PLSTexture(width, height), m_textureID(textureID)
{
#ifdef RIVE_DESKTOP_GL
if (capabilities.ARB_bindless_texture)
{
m_bindlessTextureHandle = glGetTextureHandleARB(m_textureID);
glMakeTextureHandleResidentARB(m_bindlessTextureHandle);
}
#endif
}
~PLSTextureGLImpl() override
{
#ifdef RIVE_DESKTOP_GL
if (m_bindlessTextureHandle != 0)
{
glMakeTextureHandleNonResidentARB(m_bindlessTextureHandle);
}
#else
assert(m_bindlessTextureHandle == 0);
#endif
}
GLuint textureID() const { return m_textureID; }
private:
GLuint m_textureID = 0;
};
rcp<PLSTexture> PLSRenderContextGLImpl::makeImageTexture(uint32_t width,
uint32_t height,
uint32_t mipLevelCount,
const uint8_t imageDataRGBA[])
{
GLuint textureID;
glGenTextures(1, &textureID);
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + IMAGE_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, textureID);
glTexStorage2D(GL_TEXTURE_2D, mipLevelCount, GL_RGBA8, width, height);
m_state->bindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glTexSubImage2D(GL_TEXTURE_2D,
0,
0,
0,
width,
height,
GL_RGBA,
GL_UNSIGNED_BYTE,
imageDataRGBA);
glutils::SetTexture2DSamplingParams(GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR);
glGenerateMipmap(GL_TEXTURE_2D);
return adoptImageTexture(width, height, textureID);
}
rcp<PLSTexture> PLSRenderContextGLImpl::adoptImageTexture(uint32_t width,
uint32_t height,
GLuint textureID)
{
return make_rcp<PLSTextureGLImpl>(width, height, textureID, m_capabilities);
}
// BufferRingImpl in GL on a given buffer target. In order to support WebGL2, we don't do hardware
// mapping.
class BufferRingGLImpl : public BufferRing
{
public:
static std::unique_ptr<BufferRingGLImpl> Make(size_t capacityInBytes,
GLenum target,
rcp<GLState> state)
{
return capacityInBytes != 0
? std::unique_ptr<BufferRingGLImpl>(
new BufferRingGLImpl(target, capacityInBytes, std::move(state)))
: nullptr;
}
~BufferRingGLImpl()
{
for (int i = 0; i < kBufferRingSize; ++i)
{
m_state->deleteBuffer(m_ids[i]);
}
}
GLuint submittedBufferID() const { return m_ids[submittedBufferIdx()]; }
protected:
BufferRingGLImpl(GLenum target, size_t capacityInBytes, rcp<GLState> state) :
BufferRing(capacityInBytes), m_target(target), m_state(std::move(state))
{
glGenBuffers(kBufferRingSize, m_ids);
for (int i = 0; i < kBufferRingSize; ++i)
{
m_state->bindBuffer(m_target, m_ids[i]);
glBufferData(m_target, capacityInBytes, nullptr, GL_DYNAMIC_DRAW);
}
}
void* onMapBuffer(int bufferIdx, size_t mapSizeInBytes) override
{
#ifdef RIVE_WEBGL
// WebGL doesn't support buffer mapping.
return shadowBuffer();
#else
m_state->bindBuffer(m_target, m_ids[bufferIdx]);
return glMapBufferRange(m_target,
0,
mapSizeInBytes,
GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT |
GL_MAP_UNSYNCHRONIZED_BIT);
#endif
}
void onUnmapAndSubmitBuffer(int bufferIdx, size_t mapSizeInBytes) override
{
m_state->bindBuffer(m_target, m_ids[bufferIdx]);
#ifdef RIVE_WEBGL
// WebGL doesn't support buffer mapping.
glBufferSubData(m_target, 0, mapSizeInBytes, shadowBuffer());
#else
glUnmapBuffer(m_target);
#endif
}
const GLenum m_target;
GLuint m_ids[kBufferRingSize];
const rcp<GLState> m_state;
};
// GL internalformat to use for a texture that polyfills a storage buffer.
static GLenum storage_texture_internalformat(pls::StorageBufferStructure bufferStructure)
{
switch (bufferStructure)
{
case pls::StorageBufferStructure::uint32x4:
return GL_RGBA32UI;
case pls::StorageBufferStructure::uint32x2:
return GL_RG32UI;
case pls::StorageBufferStructure::float32x4:
return GL_RGBA32F;
}
RIVE_UNREACHABLE();
}
// GL format to use for a texture that polyfills a storage buffer.
static GLenum storage_texture_format(pls::StorageBufferStructure bufferStructure)
{
switch (bufferStructure)
{
case pls::StorageBufferStructure::uint32x4:
return GL_RGBA_INTEGER;
case pls::StorageBufferStructure::uint32x2:
return GL_RG_INTEGER;
case pls::StorageBufferStructure::float32x4:
return GL_RGBA;
}
RIVE_UNREACHABLE();
}
// GL type to use for a texture that polyfills a storage buffer.
static GLenum storage_texture_type(pls::StorageBufferStructure bufferStructure)
{
switch (bufferStructure)
{
case pls::StorageBufferStructure::uint32x4:
return GL_UNSIGNED_INT;
case pls::StorageBufferStructure::uint32x2:
return GL_UNSIGNED_INT;
case pls::StorageBufferStructure::float32x4:
return GL_FLOAT;
}
RIVE_UNREACHABLE();
}
class StorageBufferRingGLImpl : public BufferRingGLImpl
{
public:
StorageBufferRingGLImpl(size_t capacityInBytes,
pls::StorageBufferStructure bufferStructure,
rcp<GLState> state) :
BufferRingGLImpl(
// If we don't support storage buffers, instead make a pixel-unpack buffer that
// will be used to copy data into the polyfill texture.
GL_SHADER_STORAGE_BUFFER,
capacityInBytes,
std::move(state)),
m_bufferStructure(bufferStructure)
{}
void bindToRenderContext(uint32_t bindingIdx,
size_t bindingSizeInBytes,
size_t offsetSizeInBytes) const
{
glBindBufferRange(GL_SHADER_STORAGE_BUFFER,
bindingIdx,
submittedBufferID(),
offsetSizeInBytes,
bindingSizeInBytes);
}
protected:
const pls::StorageBufferStructure m_bufferStructure;
};
class TexelBufferRingWebGL : public BufferRing
{
public:
TexelBufferRingWebGL(size_t capacityInBytes,
pls::StorageBufferStructure bufferStructure,
rcp<GLState> state) :
BufferRing(pls::StorageTextureBufferSize(capacityInBytes, bufferStructure)),
m_bufferStructure(bufferStructure),
m_state(std::move(state))
{
auto [width, height] = pls::StorageTextureSize(capacityInBytes, m_bufferStructure);
GLenum internalformat = storage_texture_internalformat(m_bufferStructure);
glGenTextures(pls::kBufferRingSize, m_textures);
glActiveTexture(GL_TEXTURE0);
for (size_t i = 0; i < pls::kBufferRingSize; ++i)
{
glBindTexture(GL_TEXTURE_2D, m_textures[i]);
glTexStorage2D(GL_TEXTURE_2D, 1, internalformat, width, height);
glutils::SetTexture2DSamplingParams(GL_NEAREST, GL_NEAREST);
}
glBindTexture(GL_TEXTURE_2D, 0);
}
~TexelBufferRingWebGL() { glDeleteTextures(pls::kBufferRingSize, m_textures); }
void* onMapBuffer(int bufferIdx, size_t mapSizeInBytes) override { return shadowBuffer(); }
void onUnmapAndSubmitBuffer(int bufferIdx, size_t mapSizeInBytes) override {}
void bindToRenderContext(uint32_t bindingIdx,
size_t bindingSizeInBytes,
size_t offsetSizeInBytes) const
{
auto [updateWidth, updateHeight] =
pls::StorageTextureSize(bindingSizeInBytes, m_bufferStructure);
m_state->bindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + bindingIdx);
glBindTexture(GL_TEXTURE_2D, m_textures[submittedBufferIdx()]);
glTexSubImage2D(GL_TEXTURE_2D,
0,
0,
0,
updateWidth,
updateHeight,
storage_texture_format(m_bufferStructure),
storage_texture_type(m_bufferStructure),
shadowBuffer() + offsetSizeInBytes);
}
protected:
const pls::StorageBufferStructure m_bufferStructure;
const rcp<GLState> m_state;
GLuint m_textures[pls::kBufferRingSize];
};
std::unique_ptr<BufferRing> PLSRenderContextGLImpl::makeUniformBufferRing(size_t capacityInBytes)
{
return BufferRingGLImpl::Make(capacityInBytes, GL_UNIFORM_BUFFER, m_state);
}
std::unique_ptr<BufferRing> PLSRenderContextGLImpl::makeStorageBufferRing(
size_t capacityInBytes,
pls::StorageBufferStructure bufferStructure)
{
if (capacityInBytes == 0)
{
return nullptr;
}
else if (m_capabilities.ARB_shader_storage_buffer_object)
{
return std::make_unique<StorageBufferRingGLImpl>(capacityInBytes, bufferStructure, m_state);
}
else
{
return std::make_unique<TexelBufferRingWebGL>(capacityInBytes, bufferStructure, m_state);
}
}
std::unique_ptr<BufferRing> PLSRenderContextGLImpl::makeVertexBufferRing(size_t capacityInBytes)
{
return BufferRingGLImpl::Make(capacityInBytes, GL_ARRAY_BUFFER, m_state);
}
std::unique_ptr<BufferRing> PLSRenderContextGLImpl::makeTextureTransferBufferRing(
size_t capacityInBytes)
{
return BufferRingGLImpl::Make(capacityInBytes, GL_PIXEL_UNPACK_BUFFER, m_state);
}
void PLSRenderContextGLImpl::resizeGradientTexture(uint32_t width, uint32_t height)
{
glDeleteTextures(1, &m_gradientTexture);
if (width == 0 || height == 0)
{
m_gradientTexture = 0;
return;
}
glGenTextures(1, &m_gradientTexture);
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + GRAD_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, m_gradientTexture);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, width, height);
glutils::SetTexture2DSamplingParams(GL_LINEAR, GL_LINEAR);
glBindFramebuffer(GL_FRAMEBUFFER, m_colorRampFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
m_gradientTexture,
0);
}
void PLSRenderContextGLImpl::resizeTessellationTexture(uint32_t width, uint32_t height)
{
glDeleteTextures(1, &m_tessVertexTexture);
if (width == 0 || height == 0)
{
m_tessVertexTexture = 0;
return;
}
glGenTextures(1, &m_tessVertexTexture);
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + TESS_VERTEX_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, m_tessVertexTexture);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA32UI, width, height);
glutils::SetTexture2DSamplingParams(GL_NEAREST, GL_NEAREST);
glBindFramebuffer(GL_FRAMEBUFFER, m_tessellateFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
m_tessVertexTexture,
0);
}
PLSRenderContextGLImpl::DrawShader::DrawShader(PLSRenderContextGLImpl* plsContextImpl,
GLenum shaderType,
pls::DrawType drawType,
ShaderFeatures shaderFeatures,
pls::InterlockMode interlockMode,
pls::ShaderMiscFlags shaderMiscFlags)
{
#ifdef DISABLE_PLS_ATOMICS
if (interlockMode == pls::InterlockMode::atomics)
{
// Don't draw anything in atomic mode if support for it isn't compiled in.
return;
}
#endif
std::vector<const char*> defines;
if (plsContextImpl->m_plsImpl != nullptr)
{
plsContextImpl->m_plsImpl->pushShaderDefines(interlockMode, &defines);
}
if (interlockMode == pls::InterlockMode::atomics)
{
// Atomics are currently always done on storage textures.
defines.push_back(GLSL_USING_PLS_STORAGE_TEXTURES);
}
for (size_t i = 0; i < kShaderFeatureCount; ++i)
{
ShaderFeatures feature = static_cast<ShaderFeatures>(1 << i);
if (shaderFeatures & feature)
{
assert((kVertexShaderFeaturesMask & feature) || shaderType == GL_FRAGMENT_SHADER);
if (interlockMode == pls::InterlockMode::depthStencil &&
feature == pls::ShaderFeatures::ENABLE_ADVANCED_BLEND &&
plsContextImpl->m_capabilities.KHR_blend_equation_advanced_coherent)
{
defines.push_back(GLSL_ENABLE_KHR_BLEND);
}
else
{
defines.push_back(GetShaderFeatureGLSLName(feature));
}
}
}
if (interlockMode == pls::InterlockMode::depthStencil)
{
defines.push_back(GLSL_USING_DEPTH_STENCIL);
}
std::vector<const char*> sources;
sources.push_back(glsl::constants);
sources.push_back(glsl::common);
if (shaderType == GL_FRAGMENT_SHADER &&
(shaderFeatures & ShaderFeatures::ENABLE_ADVANCED_BLEND))
{
sources.push_back(glsl::advanced_blend);
}
if (plsContextImpl->platformFeatures().avoidFlatVaryings)
{
sources.push_back("#define " GLSL_OPTIONALLY_FLAT "\n");
}
else
{
sources.push_back("#define " GLSL_OPTIONALLY_FLAT " flat\n");
}
switch (drawType)
{
case pls::DrawType::midpointFanPatches:
case pls::DrawType::outerCurvePatches:
if (shaderType == GL_VERTEX_SHADER)
{
defines.push_back(GLSL_ENABLE_INSTANCE_INDEX);
if (!plsContextImpl->m_capabilities.ANGLE_base_vertex_base_instance_shader_builtin)
{
defines.push_back(GLSL_ENABLE_SPIRV_CROSS_BASE_INSTANCE);
}
}
defines.push_back(GLSL_DRAW_PATH);
sources.push_back(pls::glsl::draw_path_common);
sources.push_back(interlockMode == pls::InterlockMode::atomics ? pls::glsl::atomic_draw
: pls::glsl::draw_path);
break;
case pls::DrawType::stencilClipReset:
assert(interlockMode == pls::InterlockMode::depthStencil);
sources.push_back(pls::glsl::stencil_draw);
break;
case pls::DrawType::interiorTriangulation:
defines.push_back(GLSL_DRAW_INTERIOR_TRIANGLES);
sources.push_back(pls::glsl::draw_path_common);
sources.push_back(interlockMode == pls::InterlockMode::atomics ? pls::glsl::atomic_draw
: pls::glsl::draw_path);
break;
case pls::DrawType::imageRect:
assert(interlockMode == pls::InterlockMode::atomics);
defines.push_back(GLSL_DRAW_IMAGE);
defines.push_back(GLSL_DRAW_IMAGE_RECT);
sources.push_back(pls::glsl::atomic_draw);
break;
case pls::DrawType::imageMesh:
defines.push_back(GLSL_DRAW_IMAGE);
defines.push_back(GLSL_DRAW_IMAGE_MESH);
sources.push_back(interlockMode == pls::InterlockMode::atomics
? pls::glsl::atomic_draw
: pls::glsl::draw_image_mesh);
break;
case pls::DrawType::plsAtomicResolve:
assert(interlockMode == pls::InterlockMode::atomics);
defines.push_back(GLSL_DRAW_RENDER_TARGET_UPDATE_BOUNDS);
defines.push_back(GLSL_RESOLVE_PLS);
if (shaderMiscFlags & pls::ShaderMiscFlags::coalescedResolveAndTransfer)
{
assert(shaderType == GL_FRAGMENT_SHADER);
defines.push_back(GLSL_COALESCED_PLS_RESOLVE_AND_TRANSFER);
}
sources.push_back(pls::glsl::atomic_draw);
break;
case pls::DrawType::plsAtomicInitialize:
assert(interlockMode == pls::InterlockMode::atomics);
RIVE_UNREACHABLE();
}
if (plsContextImpl->m_capabilities.ARB_bindless_texture)
{
defines.push_back(GLSL_ENABLE_BINDLESS_TEXTURES);
}
if (!plsContextImpl->m_capabilities.ARB_shader_storage_buffer_object)
{
defines.push_back(GLSL_DISABLE_SHADER_STORAGE_BUFFERS);
}
m_id = glutils::CompileShader(shaderType,
defines.data(),
defines.size(),
sources.data(),
sources.size(),
plsContextImpl->m_capabilities);
}
PLSRenderContextGLImpl::DrawProgram::DrawProgram(PLSRenderContextGLImpl* plsContextImpl,
pls::DrawType drawType,
pls::ShaderFeatures shaderFeatures,
pls::InterlockMode interlockMode,
pls::ShaderMiscFlags fragmentShaderMiscFlags) :
m_fragmentShader(plsContextImpl,
GL_FRAGMENT_SHADER,
drawType,
shaderFeatures,
interlockMode,
fragmentShaderMiscFlags),
m_state(plsContextImpl->m_state)
{
// Not every vertex shader is unique. Cache them by just the vertex features and reuse when
// possible.
ShaderFeatures vertexShaderFeatures = shaderFeatures & kVertexShaderFeaturesMask;
uint32_t vertexShaderKey = pls::ShaderUniqueKey(drawType,
vertexShaderFeatures,
interlockMode,
pls::ShaderMiscFlags::none);
const DrawShader& vertexShader = plsContextImpl->m_vertexShaders
.try_emplace(vertexShaderKey,
plsContextImpl,
GL_VERTEX_SHADER,
drawType,
vertexShaderFeatures,
interlockMode,
pls::ShaderMiscFlags::none)
.first->second;
m_id = glCreateProgram();
glAttachShader(m_id, vertexShader.id());
glAttachShader(m_id, m_fragmentShader.id());
glutils::LinkProgram(m_id);
m_state->bindProgram(m_id);
glUniformBlockBinding(m_id,
glGetUniformBlockIndex(m_id, GLSL_FlushUniforms),
FLUSH_UNIFORM_BUFFER_IDX);
if (drawType == DrawType::imageRect || drawType == DrawType::imageMesh)
{
glUniformBlockBinding(m_id,
glGetUniformBlockIndex(m_id, GLSL_ImageDrawUniforms),
IMAGE_DRAW_UNIFORM_BUFFER_IDX);
}
glUniform1i(glGetUniformLocation(m_id, GLSL_tessVertexTexture),
kPLSTexIdxOffset + TESS_VERTEX_TEXTURE_IDX);
if (!plsContextImpl->m_capabilities.ARB_shader_storage_buffer_object)
{
// Our GL driver doesn't support storage buffers. We polyfill these buffers as textures.
glUniform1i(glGetUniformLocation(m_id, GLSL_pathBuffer),
kPLSTexIdxOffset + PATH_BUFFER_IDX);
glUniform1i(glGetUniformLocation(m_id, GLSL_paintBuffer),
kPLSTexIdxOffset + PAINT_BUFFER_IDX);
glUniform1i(glGetUniformLocation(m_id, GLSL_paintAuxBuffer),
kPLSTexIdxOffset + PAINT_AUX_BUFFER_IDX);
glUniform1i(glGetUniformLocation(m_id, GLSL_contourBuffer),
kPLSTexIdxOffset + CONTOUR_BUFFER_IDX);
}
glUniform1i(glGetUniformLocation(m_id, GLSL_gradTexture), kPLSTexIdxOffset + GRAD_TEXTURE_IDX);
glUniform1i(glGetUniformLocation(m_id, GLSL_imageTexture),
kPLSTexIdxOffset + IMAGE_TEXTURE_IDX);
if (interlockMode == pls::InterlockMode::depthStencil &&
(shaderFeatures & pls::ShaderFeatures::ENABLE_ADVANCED_BLEND) &&
!plsContextImpl->m_capabilities.KHR_blend_equation_advanced_coherent)
{
glUniform1i(glGetUniformLocation(m_id, GLSL_dstColorTexture),
kPLSTexIdxOffset + DST_COLOR_TEXTURE_IDX);
}
if (!plsContextImpl->m_capabilities.ANGLE_base_vertex_base_instance_shader_builtin)
{
// This uniform is specifically named "SPIRV_Cross_BaseInstance" for compatibility with
// SPIRV-Cross sytems.
m_spirvCrossBaseInstanceLocation = glGetUniformLocation(m_id, "SPIRV_Cross_BaseInstance");
}
}
PLSRenderContextGLImpl::DrawProgram::~DrawProgram() { m_state->deleteProgram(m_id); }
static GLuint gl_buffer_id(const BufferRing* bufferRing)
{
return static_cast<const BufferRingGLImpl*>(bufferRing)->submittedBufferID();
}
static void bind_storage_buffer(const GLCapabilities& capabilities,
const BufferRing* bufferRing,
uint32_t bindingIdx,
size_t bindingSizeInBytes,
size_t offsetSizeInBytes)
{
assert(bufferRing != nullptr);
assert(bindingSizeInBytes > 0);
if (capabilities.ARB_shader_storage_buffer_object)
{
static_cast<const StorageBufferRingGLImpl*>(bufferRing)
->bindToRenderContext(bindingIdx, bindingSizeInBytes, offsetSizeInBytes);
}
else
{
static_cast<const TexelBufferRingWebGL*>(bufferRing)
->bindToRenderContext(bindingIdx, bindingSizeInBytes, offsetSizeInBytes);
}
}
void PLSRenderContextGLImpl::PLSImpl::ensureRasterOrderingEnabled(
PLSRenderContextGLImpl* plsContextImpl,
const pls::FlushDescriptor& desc,
bool enabled)
{
assert(!enabled || supportsRasterOrdering(plsContextImpl->m_capabilities));
auto rasterOrderState = enabled ? pls::TriState::yes : pls::TriState::no;
if (m_rasterOrderingEnabled != rasterOrderState)
{
onEnableRasterOrdering(enabled);
m_rasterOrderingEnabled = rasterOrderState;
// We only need a barrier when turning raster ordering OFF, because PLS already inserts the
// necessary barriers after draws when it's disabled.
if (m_rasterOrderingEnabled == pls::TriState::no)
{
onBarrier(desc);
}
}
}
// Wraps calls to glDrawElementsInstanced*(), as appropriate for the current platform.
// Also includes simple helpers for working with stencil.
class DrawIndexedInstancedHelper
{
public:
DrawIndexedInstancedHelper(const GLCapabilities& capabilities,
GLint spirvCrossBaseInstanceLocation,
GLenum primitiveTopology,
uint32_t instanceCount,
uint32_t baseInstance) :
m_hasBaseInstanceInShader(capabilities.ANGLE_base_vertex_base_instance_shader_builtin),
m_spirvCrossBaseInstanceLocation(spirvCrossBaseInstanceLocation),
m_primitiveTopology(primitiveTopology),
m_instanceCount(instanceCount),
m_baseInstance(baseInstance)
{
assert(m_hasBaseInstanceInShader == (m_spirvCrossBaseInstanceLocation < 0));
}
void setIndexRange(uint32_t indexCount, uint32_t baseIndex)
{
m_indexCount = indexCount;
m_indexOffset = reinterpret_cast<const void*>(baseIndex * sizeof(uint16_t));
}
void draw() const
{
#ifndef RIVE_WEBGL
if (m_hasBaseInstanceInShader)
{
glDrawElementsInstancedBaseInstanceEXT(m_primitiveTopology,
m_indexCount,
GL_UNSIGNED_SHORT,
m_indexOffset,
m_instanceCount,
m_baseInstance);
}
else
#endif
{
glUniform1i(m_spirvCrossBaseInstanceLocation, m_baseInstance);
glDrawElementsInstanced(m_primitiveTopology,
m_indexCount,
GL_UNSIGNED_SHORT,
m_indexOffset,
m_instanceCount);
}
}
void drawWithStencilSettings(GLenum comparator,
GLint ref,
GLuint mask,
GLenum stencilFailOp,
GLenum depthPassStencilFailOp,
GLenum depthPassStencilPassOp) const
{
glStencilFunc(comparator, ref, mask);
glStencilOp(stencilFailOp, depthPassStencilFailOp, depthPassStencilPassOp);
draw();
}
private:
const bool m_hasBaseInstanceInShader;
const GLint m_spirvCrossBaseInstanceLocation;
const GLenum m_primitiveTopology;
const uint32_t m_instanceCount;
const uint32_t m_baseInstance;
uint32_t m_indexCount = 0;
const void* m_indexOffset = nullptr;
};
void PLSRenderContextGLImpl::flush(const FlushDescriptor& desc)
{
auto renderTarget = static_cast<PLSRenderTargetGL*>(desc.renderTarget);
m_state->setWriteMasks(true, true, 0xff);
m_state->disableBlending();
// All programs use the same set of per-flush uniforms.
glBindBufferRange(GL_UNIFORM_BUFFER,
FLUSH_UNIFORM_BUFFER_IDX,
gl_buffer_id(flushUniformBufferRing()),
desc.flushUniformDataOffsetInBytes,
sizeof(pls::FlushUniforms));
// All programs use the same storage buffers.
if (desc.pathCount > 0)
{
bind_storage_buffer(m_capabilities,
pathBufferRing(),
PATH_BUFFER_IDX,
desc.pathCount * sizeof(pls::PathData),
desc.firstPath * sizeof(pls::PathData));
bind_storage_buffer(m_capabilities,
paintBufferRing(),
PAINT_BUFFER_IDX,
desc.pathCount * sizeof(pls::PaintData),
desc.firstPaint * sizeof(pls::PaintData));
bind_storage_buffer(m_capabilities,
paintAuxBufferRing(),
PAINT_AUX_BUFFER_IDX,
desc.pathCount * sizeof(pls::PaintAuxData),
desc.firstPaintAux * sizeof(pls::PaintAuxData));
}
if (desc.contourCount > 0)
{
bind_storage_buffer(m_capabilities,
contourBufferRing(),
CONTOUR_BUFFER_IDX,
desc.contourCount * sizeof(pls::ContourData),
desc.firstContour * sizeof(pls::ContourData));
}
// Render the complex color ramps into the gradient texture.
if (desc.complexGradSpanCount > 0)
{
m_state->bindBuffer(GL_ARRAY_BUFFER, gl_buffer_id(gradSpanBufferRing()));
m_state->bindVAO(m_colorRampVAO);
m_state->setCullFace(GL_BACK);
glVertexAttribIPointer(
0,
4,
GL_UNSIGNED_INT,
0,
reinterpret_cast<const void*>(desc.firstComplexGradSpan * sizeof(pls::GradientSpan)));
glViewport(0, desc.complexGradRowsTop, kGradTextureWidth, desc.complexGradRowsHeight);
glBindFramebuffer(GL_FRAMEBUFFER, m_colorRampFBO);
m_state->bindProgram(m_colorRampProgram);
GLenum colorAttachment0 = GL_COLOR_ATTACHMENT0;
glInvalidateFramebuffer(GL_FRAMEBUFFER, 1, &colorAttachment0);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, desc.complexGradSpanCount);
}
// Copy the simple color ramps to the gradient texture.
if (desc.simpleGradTexelsHeight > 0)
{
m_state->bindBuffer(GL_PIXEL_UNPACK_BUFFER, gl_buffer_id(simpleColorRampsBufferRing()));
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + GRAD_TEXTURE_IDX);
#ifdef RIVE_WEBGL
// Emscripten has a bug with glTexSubImage2D when a PIXEL_UNPACK_BUFFER is bound. Make the
// call ourselves directly.
webgl_texSubImage2DWithOffset(emscripten_webgl_get_current_context(),
GL_TEXTURE_2D,
0,
0,
0,
desc.simpleGradTexelsWidth,
desc.simpleGradTexelsHeight,
GL_RGBA,
GL_UNSIGNED_BYTE,
desc.simpleGradDataOffsetInBytes);
#else
glTexSubImage2D(GL_TEXTURE_2D,
0,
0,
0,
desc.simpleGradTexelsWidth,
desc.simpleGradTexelsHeight,
GL_RGBA,
GL_UNSIGNED_BYTE,
reinterpret_cast<const void*>(desc.simpleGradDataOffsetInBytes));
#endif
}
// Tessellate all curves into vertices in the tessellation texture.
if (desc.tessVertexSpanCount > 0)
{
m_state->bindBuffer(GL_ARRAY_BUFFER, gl_buffer_id(tessSpanBufferRing()));
m_state->bindVAO(m_tessellateVAO);
m_state->setCullFace(GL_BACK);
size_t tessSpanOffsetInBytes = desc.firstTessVertexSpan * sizeof(pls::TessVertexSpan);
for (uintptr_t i = 0; i < 3; ++i)
{
glVertexAttribPointer(i,
4,
GL_FLOAT,
GL_FALSE,
sizeof(TessVertexSpan),
reinterpret_cast<const void*>(tessSpanOffsetInBytes + i * 4 * 4));
}
glVertexAttribIPointer(
3,
4,
GL_UNSIGNED_INT,
sizeof(TessVertexSpan),
reinterpret_cast<const void*>(tessSpanOffsetInBytes + offsetof(TessVertexSpan, x0x1)));
glViewport(0, 0, pls::kTessTextureWidth, desc.tessDataHeight);
glBindFramebuffer(GL_FRAMEBUFFER, m_tessellateFBO);
m_state->bindProgram(m_tessellateProgram);
GLenum colorAttachment0 = GL_COLOR_ATTACHMENT0;
glInvalidateFramebuffer(GL_FRAMEBUFFER, 1, &colorAttachment0);
glDrawElementsInstanced(GL_TRIANGLES,
std::size(pls::kTessSpanIndices),
GL_UNSIGNED_SHORT,
0,
desc.tessVertexSpanCount);
}
// Compile the draw programs before activating pixel local storage.
// Cache specific compilations by DrawType and ShaderFeatures.
// (ANGLE_shader_pixel_local_storage doesn't allow shader compilation while active.)
for (const DrawBatch& batch : *desc.drawList)
{
auto shaderFeatures = desc.interlockMode == pls::InterlockMode::atomics
? desc.combinedShaderFeatures
: batch.shaderFeatures;
auto fragmentShaderMiscFlags = batch.drawType == pls::DrawType::plsAtomicResolve
? m_plsImpl->atomicResolveShaderMiscFlags(desc)
: pls::ShaderMiscFlags::none;
uint32_t fragmentShaderKey = pls::ShaderUniqueKey(batch.drawType,
shaderFeatures,
desc.interlockMode,
fragmentShaderMiscFlags);
m_drawPrograms.try_emplace(fragmentShaderKey,
this,
batch.drawType,
shaderFeatures,
desc.interlockMode,
fragmentShaderMiscFlags);
}
// Bind the currently-submitted buffer in the triangleBufferRing to its vertex array.
if (desc.hasTriangleVertices)
{
m_state->bindVAO(m_trianglesVAO);
m_state->bindBuffer(GL_ARRAY_BUFFER, gl_buffer_id(triangleBufferRing()));
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
}
glViewport(0, 0, renderTarget->width(), renderTarget->height());
#ifdef RIVE_DESKTOP_GL
if (m_capabilities.ANGLE_polygon_mode && desc.wireframe)
{
glPolygonModeANGLE(GL_FRONT_AND_BACK, GL_LINE_ANGLE);
glLineWidth(2);
}
#endif
auto msaaResolveAction = PLSRenderTargetGL::MSAAResolveAction::automatic;
std::array<GLenum, 3> msaaDepthStencilColor;
if (desc.interlockMode != pls::InterlockMode::depthStencil)
{
assert(desc.msaaSampleCount == 0);
m_plsImpl->activatePixelLocalStorage(this, desc);
}
else
{
// Render with MSAA in depthStencil mode.
assert(desc.msaaSampleCount > 0);
bool preserveRenderTarget = desc.colorLoadAction == pls::LoadAction::preserveRenderTarget;
bool isFBO0;
msaaResolveAction = renderTarget->bindMSAAFramebuffer(
this,
desc.msaaSampleCount,
preserveRenderTarget ? &desc.renderTargetUpdateBounds : nullptr,
&isFBO0);
// Hint to tilers to not load unnecessary buffers from memory.
if (isFBO0)
{
msaaDepthStencilColor = {GL_DEPTH, GL_STENCIL, GL_COLOR};
}
else
{
msaaDepthStencilColor = {GL_DEPTH_ATTACHMENT,
GL_STENCIL_ATTACHMENT,
GL_COLOR_ATTACHMENT0};
}
glInvalidateFramebuffer(GL_FRAMEBUFFER,
preserveRenderTarget ? 2 : 3,
msaaDepthStencilColor.data());
GLbitfield buffersToClear = GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
if (desc.colorLoadAction == pls::LoadAction::clear)
{
float cc[4];
UnpackColorToRGBA32F(desc.clearColor, cc);
glClearColor(cc[0], cc[1], cc[2], cc[3]);
buffersToClear |= GL_COLOR_BUFFER_BIT;
}
glClear(buffersToClear);
glEnable(GL_STENCIL_TEST);
glEnable(GL_DEPTH_TEST);
if (desc.combinedShaderFeatures & pls::ShaderFeatures::ENABLE_ADVANCED_BLEND)
{
if (m_capabilities.KHR_blend_equation_advanced_coherent)
{
glEnable(GL_BLEND_ADVANCED_COHERENT_KHR);
}
else
{
// Set up an internal texture to copy the framebuffer into, for in-shader blending.
renderTarget->bindInternalDstTexture(GL_TEXTURE0 + kPLSTexIdxOffset +
DST_COLOR_TEXTURE_IDX);
}
}
}
bool clipPlanesEnabled = false;
// Execute the DrawList.
for (const DrawBatch& batch : *desc.drawList)
{
if (batch.elementCount == 0)
{
continue;
}
auto shaderFeatures = desc.interlockMode == pls::InterlockMode::atomics
? desc.combinedShaderFeatures
: batch.shaderFeatures;
auto fragmentShaderMiscFlags = batch.drawType == pls::DrawType::plsAtomicResolve
? m_plsImpl->atomicResolveShaderMiscFlags(desc)
: pls::ShaderMiscFlags::none;
uint32_t fragmentShaderKey = pls::ShaderUniqueKey(batch.drawType,
shaderFeatures,
desc.interlockMode,
fragmentShaderMiscFlags);
const DrawProgram& drawProgram = m_drawPrograms.find(fragmentShaderKey)->second;
if (drawProgram.id() == 0)
{
fprintf(stderr, "WARNING: skipping draw due to missing GL program.\n");
continue;
}
m_state->bindProgram(drawProgram.id());
if (auto imageTextureGL = static_cast<const PLSTextureGLImpl*>(batch.imageTexture))
{
glActiveTexture(GL_TEXTURE0 + kPLSTexIdxOffset + IMAGE_TEXTURE_IDX);
glBindTexture(GL_TEXTURE_2D, imageTextureGL->textureID());
}
if (desc.interlockMode == pls::InterlockMode::depthStencil)
{
// Set up the next blend.
if (batch.drawContents & pls::DrawContents::opaquePaint)
{
m_state->disableBlending();
}
else if (!(batch.drawContents & pls::DrawContents::advancedBlend))
{
assert(batch.internalDrawList->blendMode() == BlendMode::srcOver);
m_state->setBlendEquation(BlendMode::srcOver);
}
else if (m_capabilities.KHR_blend_equation_advanced_coherent)
{
// When m_platformFeatures.supportsKHRBlendEquations is true in depthStencil mode,
// the renderContext does not combine draws when they have different blend modes.
m_state->setBlendEquation(batch.internalDrawList->blendMode());
}
else
{
// Read back the framebuffer where we need a dstColor for blending.
renderTarget->bindInternalFramebuffer(GL_DRAW_FRAMEBUFFER,
PLSRenderTargetGL::DrawBufferMask::color);
for (const PLSDraw* draw = batch.internalDrawList; draw != nullptr;
draw = draw->batchInternalNeighbor())
{
assert(draw->blendMode() != BlendMode::srcOver);
glutils::BlitFramebuffer(draw->pixelBounds(), renderTarget->height());
}
renderTarget->bindMSAAFramebuffer(this, desc.msaaSampleCount);
m_state->disableBlending(); // Blend in the shader instead.
}
// Set up the next clipRect.
bool needsClipPlanes = (shaderFeatures & pls::ShaderFeatures::ENABLE_CLIP_RECT);
if (needsClipPlanes != clipPlanesEnabled)
{
auto toggleEnableOrDisable = needsClipPlanes ? glEnable : glDisable;
toggleEnableOrDisable(GL_CLIP_DISTANCE0_EXT);
toggleEnableOrDisable(GL_CLIP_DISTANCE1_EXT);
toggleEnableOrDisable(GL_CLIP_DISTANCE2_EXT);
toggleEnableOrDisable(GL_CLIP_DISTANCE3_EXT);
clipPlanesEnabled = needsClipPlanes;
}
}
switch (pls::DrawType drawType = batch.drawType)
{
case DrawType::midpointFanPatches:
case DrawType::outerCurvePatches:
{
// Draw PLS patches that connect the tessellation vertices.
m_state->bindVAO(m_drawVAO);
DrawIndexedInstancedHelper drawHelper(m_capabilities,
drawProgram.spirvCrossBaseInstanceLocation(),
GL_TRIANGLES,
batch.elementCount,
batch.baseElement);
if (desc.interlockMode != pls::InterlockMode::depthStencil)
{
m_plsImpl->ensureRasterOrderingEnabled(this,
desc,
desc.interlockMode ==
pls::InterlockMode::rasterOrdering);
drawHelper.setIndexRange(pls::PatchIndexCount(drawType),
pls::PatchBaseIndex(drawType));
m_state->setCullFace(GL_BACK);
drawHelper.draw();
break;
}
// MSAA path draws require different stencil settings, depending on their
// drawContents.
bool hasActiveClip = ((batch.drawContents & pls::DrawContents::activeClip));
bool isClipUpdate = ((batch.drawContents & pls::DrawContents::clipUpdate));
bool isNestedClipUpdate =
(batch.drawContents & pls::kNestedClipUpdateMask) == pls::kNestedClipUpdateMask;
bool isEvenOddFill = (batch.drawContents & pls::DrawContents::evenOddFill);
bool isStroke = (batch.drawContents & pls::DrawContents::stroke);
if (isStroke)
{
// MSAA strokes only use the "border" section of the patch.
// (The depth test prevents double hits.)
assert(drawType == pls::DrawType::midpointFanPatches);
drawHelper.setIndexRange(pls::kMidpointFanPatchBorderIndexCount,
pls::kMidpointFanPatchBaseIndex);
m_state->setWriteMasks(true, true, 0xff);
m_state->setCullFace(GL_BACK);
drawHelper.drawWithStencilSettings(hasActiveClip ? GL_EQUAL : GL_ALWAYS,
0x80,
0xff,
GL_KEEP,
GL_KEEP,
GL_KEEP);
break;
}
// MSAA fills only use the "fan" section of the patch (the don't need AA borders).
drawHelper.setIndexRange(pls::PatchFanIndexCount(drawType),
pls::PatchFanBaseIndex(drawType));
// "nonZero" fill rules (that aren't nested clip updates) can be optimized to render
// directly instead of using a "stencil then cover" approach.
if (!isEvenOddFill && !isNestedClipUpdate)
{
// Count backward triangle hits (negative coverage) in the stencil buffer.
m_state->setWriteMasks(false, false, 0x7f);
m_state->setCullFace(GL_FRONT);
drawHelper.drawWithStencilSettings(hasActiveClip ? GL_LEQUAL : GL_ALWAYS,
0x80,
0xff,
GL_KEEP,
GL_KEEP,
GL_INCR_WRAP);
// (Configure both stencil faces before issuing the next draws, so GL can give
// them the same internal pipeline under the hood.)
GLuint stencilReadMask = hasActiveClip ? 0xff : 0x7f;
glStencilFuncSeparate(GL_FRONT, GL_EQUAL, 0x80, stencilReadMask);
glStencilOpSeparate(GL_FRONT,
GL_DECR, // Don't wrap; 0 must stay 0 outside the clip.
GL_KEEP,
isClipUpdate ? GL_REPLACE : GL_KEEP);
glStencilFuncSeparate(GL_BACK, GL_LESS, 0x80, stencilReadMask);
glStencilOpSeparate(GL_BACK,
GL_KEEP,
GL_KEEP,
isClipUpdate ? GL_REPLACE : GL_ZERO);
m_state->setWriteMasks(!isClipUpdate,
!isClipUpdate,
isClipUpdate ? 0xff : 0x7f);
// Draw forward triangles, clipped by the backward triangle counts.
// (The depth test prevents double hits.)
m_state->setCullFace(GL_BACK);
drawHelper.draw();
// Clean up backward triangles in the stencil buffer, (also filling
// negative winding numbers).
m_state->setCullFace(GL_FRONT);
drawHelper.draw();
break;
}
// Fall back on stencil-then-cover.
glStencilFunc(hasActiveClip ? GL_LEQUAL : GL_ALWAYS, 0x80, 0xff);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
m_state->setWriteMasks(false, false, isEvenOddFill ? 0x1 : 0x7f);
m_state->setCullFace(GL_NONE);
drawHelper.draw(); // Stencil the path!
// Nested clip updates do the "cover" operation during DrawType::stencilClipReset.
if (!isNestedClipUpdate)
{
assert(isEvenOddFill);
m_state->setWriteMasks(!isClipUpdate, !isClipUpdate, isClipUpdate ? 0xff : 0x1);
drawHelper.drawWithStencilSettings(GL_NOTEQUAL, // Cover the path!
0x80,
0x7f,
GL_KEEP,
GL_KEEP,
isClipUpdate ? GL_REPLACE : GL_ZERO);
}
break;
}
case pls::DrawType::stencilClipReset:
{
assert(desc.interlockMode == pls::InterlockMode::depthStencil);
m_state->bindVAO(m_trianglesVAO);
bool isNestedClipUpdate =
(batch.drawContents & pls::kNestedClipUpdateMask) == pls::kNestedClipUpdateMask;
if (isNestedClipUpdate)
{
// The nested clip just got stencilled and left in the stencil buffer. Intersect
// it with the existing clip. (Erasing regions of the existing clip that are
// outside the nested clip.)
glStencilFunc(GL_LESS, 0x80, 0xff);
glStencilOp(GL_ZERO, GL_KEEP, GL_REPLACE);
}
else
{
// Clear the entire previous clip.
glStencilFunc(GL_NOTEQUAL, 0, 0xff);
glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
}
m_state->setWriteMasks(false, false, 0xff);
m_state->setCullFace(GL_BACK);
glDrawArrays(GL_TRIANGLES, batch.baseElement, batch.elementCount);
break;
}
case pls::DrawType::interiorTriangulation:
{
assert(desc.interlockMode != pls::InterlockMode::depthStencil); // TODO!
m_plsImpl->ensureRasterOrderingEnabled(this, desc, false);
m_state->bindVAO(m_trianglesVAO);
m_state->setCullFace(GL_BACK);
glDrawArrays(GL_TRIANGLES, batch.baseElement, batch.elementCount);
break;
}
case pls::DrawType::imageRect:
{
assert(desc.interlockMode == pls::InterlockMode::atomics);
assert(!m_capabilities.ARB_bindless_texture);
assert(m_imageRectVAO != 0); // Should have gotten lazily allocated by now.
m_plsImpl->ensureRasterOrderingEnabled(this, desc, false);
m_state->bindVAO(m_imageRectVAO);
glBindBufferRange(GL_UNIFORM_BUFFER,
IMAGE_DRAW_UNIFORM_BUFFER_IDX,
gl_buffer_id(imageDrawUniformBufferRing()),
batch.imageDrawDataOffset,
sizeof(pls::ImageDrawUniforms));
m_state->setCullFace(GL_NONE);
glDrawElements(GL_TRIANGLES,
std::size(pls::kImageRectIndices),
GL_UNSIGNED_SHORT,
nullptr);
break;
}
case pls::DrawType::imageMesh:
{
LITE_RTTI_CAST_OR_BREAK(vertexBuffer,
const PLSRenderBufferGLImpl*,
batch.vertexBuffer);
LITE_RTTI_CAST_OR_BREAK(uvBuffer, const PLSRenderBufferGLImpl*, batch.uvBuffer);
LITE_RTTI_CAST_OR_BREAK(indexBuffer,
const PLSRenderBufferGLImpl*,
batch.indexBuffer);
m_state->bindVAO(m_imageMeshVAO);
m_state->bindBuffer(GL_ARRAY_BUFFER, vertexBuffer->submittedBufferID());
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
m_state->bindBuffer(GL_ARRAY_BUFFER, uvBuffer->submittedBufferID());
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
m_state->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer->submittedBufferID());
glBindBufferRange(GL_UNIFORM_BUFFER,
IMAGE_DRAW_UNIFORM_BUFFER_IDX,
gl_buffer_id(imageDrawUniformBufferRing()),
batch.imageDrawDataOffset,
sizeof(pls::ImageDrawUniforms));
if (desc.interlockMode != pls::InterlockMode::depthStencil)
{
// Try to enable raster ordering for image meshes in rasterOrdering and atomic
// mode both; we have no control over whether the internal geometry has self
// overlaps.
m_plsImpl->ensureRasterOrderingEnabled(
this,
desc,
m_platformFeatures.supportsRasterOrdering);
}
else
{
bool hasActiveClip = ((batch.drawContents & pls::DrawContents::activeClip));
glStencilFunc(hasActiveClip ? GL_EQUAL : GL_ALWAYS, 0x80, 0xff);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
m_state->setWriteMasks(true, true, 0xff);
}
m_state->setCullFace(GL_NONE);
glDrawElements(GL_TRIANGLES,
batch.elementCount,
GL_UNSIGNED_SHORT,
reinterpret_cast<const void*>(batch.baseElement * sizeof(uint16_t)));
break;
}
case pls::DrawType::plsAtomicResolve:
{
assert(desc.interlockMode == pls::InterlockMode::atomics);
m_plsImpl->ensureRasterOrderingEnabled(this, desc, false);
m_state->bindVAO(m_emptyVAO);
m_plsImpl->setupAtomicResolve(this, desc);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
break;
}
case pls::DrawType::plsAtomicInitialize:
{
assert(desc.interlockMode == pls::InterlockMode::atomics);
RIVE_UNREACHABLE();
}
}
if (desc.interlockMode != pls::InterlockMode::depthStencil && batch.needsBarrier &&
batch.drawType != pls::DrawType::imageMesh /*EW!*/)
{
m_plsImpl->barrier(desc);
}
}
if (desc.interlockMode != pls::InterlockMode::depthStencil)
{
m_plsImpl->deactivatePixelLocalStorage(this, desc);
}
else
{
// Depth/stencil don't need to be written out.
glInvalidateFramebuffer(GL_DRAW_FRAMEBUFFER, 2, msaaDepthStencilColor.data());
if ((desc.combinedShaderFeatures & pls::ShaderFeatures::ENABLE_ADVANCED_BLEND) &&
m_capabilities.KHR_blend_equation_advanced_coherent)
{
glDisable(GL_BLEND_ADVANCED_COHERENT_KHR);
}
glDisable(GL_DEPTH_TEST);
glDisable(GL_STENCIL_TEST);
if (msaaResolveAction == PLSRenderTargetGL::MSAAResolveAction::framebufferBlit)
{
renderTarget->bindDestinationFramebuffer(GL_DRAW_FRAMEBUFFER);
glutils::BlitFramebuffer(desc.renderTargetUpdateBounds,
renderTarget->height(),
GL_COLOR_BUFFER_BIT);
}
if (clipPlanesEnabled)
{
glDisable(GL_CLIP_DISTANCE0_EXT);
glDisable(GL_CLIP_DISTANCE1_EXT);
glDisable(GL_CLIP_DISTANCE2_EXT);
glDisable(GL_CLIP_DISTANCE3_EXT);
}
}
#ifdef RIVE_DESKTOP_GL
if (m_capabilities.ANGLE_polygon_mode && desc.wireframe)
{
glPolygonModeANGLE(GL_FRONT_AND_BACK, GL_FILL_ANGLE);
}
#endif
}
void PLSRenderContextGLImpl::blitTextureToFramebufferAsDraw(GLuint textureID,
const IAABB& bounds,
uint32_t renderTargetHeight)
{
if (m_blitAsDrawProgram == 0)
{
const char* blitSources[] = {glsl::constants, glsl::common, glsl::blit_texture_as_draw};
m_blitAsDrawProgram = glutils::Program();
m_blitAsDrawProgram.compileAndAttachShader(GL_VERTEX_SHADER,
nullptr,
0,
blitSources,
std::size(blitSources),
m_capabilities);
m_blitAsDrawProgram.compileAndAttachShader(GL_FRAGMENT_SHADER,
nullptr,
0,
blitSources,
std::size(blitSources),
m_capabilities);
m_blitAsDrawProgram.link();
m_state->bindProgram(m_blitAsDrawProgram);
glUniform1i(glGetUniformLocation(m_blitAsDrawProgram, GLSL_blitTextureSource), 0);
}
m_state->bindProgram(m_blitAsDrawProgram);
m_state->bindVAO(m_emptyVAO);
m_state->setWriteMasks(true, true, 0xff);
m_state->disableBlending();
m_state->setCullFace(GL_NONE);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID);
glEnable(GL_SCISSOR_TEST);
glScissor(bounds.left, renderTargetHeight - bounds.bottom, bounds.width(), bounds.height());
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisable(GL_SCISSOR_TEST);
}
std::unique_ptr<PLSRenderContext> PLSRenderContextGLImpl::MakeContext(
const ContextOptions& contextOptions)
{
GLCapabilities capabilities{};
const char* glVersionStr = (const char*)glGetString(GL_VERSION);
#ifdef RIVE_WEBGL
capabilities.isGLES = true;
#else
capabilities.isGLES = strstr(glVersionStr, "OpenGL ES") != NULL;
#endif
if (capabilities.isGLES)
{
#ifdef RIVE_WEBGL
capabilities.isANGLEOrWebGL = true;
#else
capabilities.isANGLEOrWebGL = strstr(glVersionStr, "ANGLE") != NULL;
#endif
#ifdef _MSC_VER
sscanf_s(
#else
sscanf(
#endif
glVersionStr,
"OpenGL ES %d.%d",
&capabilities.contextVersionMajor,
&capabilities.contextVersionMinor);
}
else
{
capabilities.isANGLEOrWebGL = false;
#ifdef _MSC_VER
sscanf_s(
#else
sscanf(
#endif
glVersionStr,
"%d.%d",
&capabilities.contextVersionMajor,
&capabilities.contextVersionMinor);
}
#ifdef RIVE_DESKTOP_GL
assert(capabilities.contextVersionMajor == GLAD_GL_version_major);
assert(capabilities.contextVersionMinor == GLAD_GL_version_minor);
assert(capabilities.isGLES == static_cast<bool>(GLAD_GL_version_es));
#endif
if (capabilities.isGLES)
{
if (!capabilities.isContextVersionAtLeast(3, 0))
{
fprintf(stderr,
"OpenGL ES %i.%i not supported. Minimum supported version is 3.0.\n",
capabilities.contextVersionMajor,
capabilities.contextVersionMinor);
return nullptr;
}
}
else
{
if (!capabilities.isContextVersionAtLeast(4, 2))
{
fprintf(stderr,
"OpenGL %i.%i not supported. Minimum supported version is 4.2.\n",
capabilities.contextVersionMajor,
capabilities.contextVersionMinor);
return nullptr;
}
}
// Our baseline feature set is GLES 3.0. Capabilities from newer context versions are reported
// as extensions.
if (capabilities.isGLES)
{
if (capabilities.isContextVersionAtLeast(3, 1))
{
capabilities.ARB_shader_storage_buffer_object = true;
}
}
else
{
if (capabilities.isContextVersionAtLeast(4, 2))
{
capabilities.ARB_shader_image_load_store = true;
}
if (capabilities.isContextVersionAtLeast(4, 3))
{
capabilities.ARB_shader_storage_buffer_object = true;
}
capabilities.EXT_clip_cull_distance = true;
}
#ifndef RIVE_WEBGL
GLint extensionCount;
glGetIntegerv(GL_NUM_EXTENSIONS, &extensionCount);
for (int i = 0; i < extensionCount; ++i)
{
auto* ext = reinterpret_cast<const char*>(glGetStringi(GL_EXTENSIONS, i));
if (strcmp(ext, "GL_ANGLE_base_vertex_base_instance_shader_builtin") == 0)
{
capabilities.ANGLE_base_vertex_base_instance_shader_builtin = true;
}
else if (strcmp(ext, "GL_ANGLE_shader_pixel_local_storage") == 0)
{
capabilities.ANGLE_shader_pixel_local_storage = true;
}
else if (strcmp(ext, "GL_ANGLE_shader_pixel_local_storage_coherent") == 0)
{
capabilities.ANGLE_shader_pixel_local_storage_coherent = true;
}
else if (strcmp(ext, "GL_ANGLE_provoking_vertex") == 0)
{
capabilities.ANGLE_provoking_vertex = true;
}
else if (strcmp(ext, "GL_ANGLE_polygon_mode") == 0)
{
capabilities.ANGLE_polygon_mode = true;
}
else if (strcmp(ext, "GL_ARM_shader_framebuffer_fetch") == 0)
{
capabilities.ARM_shader_framebuffer_fetch = true;
}
else if (strcmp(ext, "GL_ARB_fragment_shader_interlock") == 0)
{
capabilities.ARB_fragment_shader_interlock = true;
}
else if (strcmp(ext, "GL_ARB_shader_image_load_store") == 0)
{
capabilities.ARB_shader_image_load_store = true;
}
else if (strcmp(ext, "GL_ARB_shader_storage_buffer_object") == 0)
{
capabilities.ARB_shader_storage_buffer_object = true;
}
else if (strcmp(ext, "GL_KHR_blend_equation_advanced") == 0)
{
capabilities.KHR_blend_equation_advanced = true;
}
else if (strcmp(ext, "GL_KHR_blend_equation_advanced_coherent") == 0)
{
capabilities.KHR_blend_equation_advanced_coherent = true;
}
else if (strcmp(ext, "GL_EXT_base_instance") == 0)
{
capabilities.EXT_base_instance = true;
}
else if (strcmp(ext, "GL_EXT_clip_cull_distance") == 0)
{
capabilities.EXT_clip_cull_distance = true;
}
else if (strcmp(ext, "GL_EXT_multisampled_render_to_texture") == 0)
{
capabilities.EXT_multisampled_render_to_texture = true;
}
else if (strcmp(ext, "GL_ANGLE_clip_cull_distance") == 0)
{
capabilities.EXT_clip_cull_distance = true;
}
else if (strcmp(ext, "GL_INTEL_fragment_shader_ordering") == 0)
{
capabilities.INTEL_fragment_shader_ordering = true;
}
else if (strcmp(ext, "GL_EXT_shader_framebuffer_fetch") == 0)
{
capabilities.EXT_shader_framebuffer_fetch = true;
}
else if (strcmp(ext, "GL_EXT_shader_pixel_local_storage") == 0)
{
capabilities.EXT_shader_pixel_local_storage = true;
}
else if (strcmp(ext, "GL_QCOM_shader_framebuffer_fetch_noncoherent") == 0)
{
capabilities.QCOM_shader_framebuffer_fetch_noncoherent = true;
}
}
#else // !RIVE_WEBGL -> RIVE_WEBGL
if (webgl_enable_WEBGL_shader_pixel_local_storage_coherent())
{
capabilities.ANGLE_shader_pixel_local_storage = true;
capabilities.ANGLE_shader_pixel_local_storage_coherent = true;
}
if (webgl_enable_WEBGL_provoking_vertex())
{
capabilities.ANGLE_provoking_vertex = true;
}
if (emscripten_webgl_enable_extension(emscripten_webgl_get_current_context(),
"WEBGL_clip_cull_distance"))
{
capabilities.EXT_clip_cull_distance = true;
}
#endif // RIVE_WEBGL
#ifdef RIVE_DESKTOP_GL
// We implement some ES capabilities with core Desktop GL in glad_custom.c.
if (GLAD_GL_ARB_bindless_texture)
{
capabilities.ARB_bindless_texture = true;
}
if (GLAD_GL_ANGLE_base_vertex_base_instance_shader_builtin)
{
capabilities.ANGLE_base_vertex_base_instance_shader_builtin = true;
}
if (GLAD_GL_ANGLE_polygon_mode)
{
capabilities.ANGLE_polygon_mode = true;
}
if (GLAD_GL_EXT_base_instance)
{
capabilities.EXT_base_instance = true;
}
#endif
// We need four storage buffers in the vertex shader. Disable the extension if this isn't
// supported.
if (capabilities.ARB_shader_storage_buffer_object)
{
int maxVertexShaderStorageBlocks;
glGetIntegerv(GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, &maxVertexShaderStorageBlocks);
if (maxVertexShaderStorageBlocks < pls::kMaxStorageBuffers)
{
capabilities.ARB_shader_storage_buffer_object = false;
}
}
// Now disable the extensions we don't want to use internally.
if (contextOptions.disableFragmentShaderInterlock)
{
capabilities.ARB_fragment_shader_interlock = false;
capabilities.INTEL_fragment_shader_ordering = false;
}
GLenum rendererToken = GL_RENDERER;
#ifdef RIVE_WEBGL
if (emscripten_webgl_enable_extension(emscripten_webgl_get_current_context(),
"WEBGL_debug_renderer_info"))
{
rendererToken = GL_UNMASKED_RENDERER_WEBGL;
}
#endif
const char* rendererString = reinterpret_cast<const char*>(glGetString(rendererToken));
if (strstr(rendererString, "Direct3D") != nullptr)
{
// Disable ANGLE_base_vertex_base_instance_shader_builtin on ANGLE/D3D. This extension is
// polyfilled on D3D anyway, and we need to test our fallback.
capabilities.ANGLE_base_vertex_base_instance_shader_builtin = false;
// Our use of EXT_multisampled_render_to_texture causes a segfault in the Microsoft WARP
// (software) renderer. Just don't use this extension on D3D since it's polyfilled anyway.
capabilities.EXT_multisampled_render_to_texture = false;
}
#ifdef RIVE_ANDROID
LoadGLESExtensions(capabilities); // Android doesn't load extension functions for us.
#endif
if (!contextOptions.disablePixelLocalStorage)
{
#ifdef RIVE_ANDROID
if (capabilities.EXT_shader_pixel_local_storage &&
(capabilities.ARM_shader_framebuffer_fetch ||
capabilities.EXT_shader_framebuffer_fetch))
{
return MakeContext(rendererString, capabilities, MakePLSImplEXTNative(capabilities));
}
if (capabilities.EXT_shader_framebuffer_fetch)
{
// EXT_shader_framebuffer_fetch is costly on Qualcomm, with or without the "noncoherent"
// extension. Use MSAA on Adreno.
if (strstr(rendererString, "Adreno") == nullptr)
{
return MakeContext(rendererString,
capabilities,
MakePLSImplFramebufferFetch(capabilities));
}
}
#else
if (capabilities.ANGLE_shader_pixel_local_storage_coherent)
{
// EXT_shader_framebuffer_fetch is costly on Qualcomm, with or without the "noncoherent"
// extension. Use MSAA on Adreno.
if (strstr(rendererString, "Adreno") == nullptr)
{
return MakeContext(rendererString, capabilities, MakePLSImplWebGL());
}
}
#endif
#ifdef RIVE_DESKTOP_GL
if (capabilities.ARB_shader_image_load_store)
{
return MakeContext(rendererString, capabilities, MakePLSImplRWTexture());
}
#endif
}
return MakeContext(rendererString, capabilities, nullptr);
}
std::unique_ptr<PLSRenderContext> PLSRenderContextGLImpl::MakeContext(
const char* rendererString,
GLCapabilities capabilities,
std::unique_ptr<PLSImpl> plsImpl)
{
auto plsContextImpl = std::unique_ptr<PLSRenderContextGLImpl>(
new PLSRenderContextGLImpl(rendererString, capabilities, std::move(plsImpl)));
return std::make_unique<PLSRenderContext>(std::move(plsContextImpl));
}
} // namespace rive::pls