Examples; imgui_impl_opengl3.cpp to work with Emscripten (#1941)
* Add some ifdefs to add emscripten specific params and includes
* Update imgui_impl_opengl3.cpp
* Update imgui_impl_opengl3.cpp
* Update imgui_impl_opengl3.cpp
* replace __EMSCRIPTEN_BUILD__ with __EMSCRIPTEN__
* replace GLFW_INCLUDE_ES3 with direct header
* removing useless glfw include
* Making call to glPolygonMode() optional
diff --git a/examples/imgui_impl_opengl3.cpp b/examples/imgui_impl_opengl3.cpp
index daa418a..2af295a 100644
--- a/examples/imgui_impl_opengl3.cpp
+++ b/examples/imgui_impl_opengl3.cpp
@@ -37,7 +37,7 @@
// 3.2 150 "#version 150"
// 3.3 330
// 4.0 400
-// 4.1 410
+// 4.1 410 "#version 410 core"
// 4.2 420
// 4.3 430
// ES 2.0 100 "#version 100"
@@ -57,7 +57,11 @@
#include <stdint.h> // intptr_t
#endif
-#include <GL/gl3w.h> // This example is using gl3w to access OpenGL functions. You may use another OpenGL loader/header such as: glew, glext, glad, glLoadGen, etc.
+#ifdef __EMSCRIPTEN__
+ #include <GLES3/gl3.h>
+#else
+ #include <GL/gl3w.h> // This example is using gl3w to access OpenGL functions. You may use another OpenGL loader/header such as: glew, glext, glad, glLoadGen, etc.
+#endif
//#include <glew.h>
//#include <glext.h>
//#include <glad/glad.h>
@@ -114,7 +118,9 @@
GLint last_sampler; glGetIntegerv(GL_SAMPLER_BINDING, &last_sampler);
GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
- GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
+ #ifdef GL_POLYGON_MODE
+ GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
+ #endif
GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
GLenum last_blend_src_rgb; glGetIntegerv(GL_BLEND_SRC_RGB, (GLint*)&last_blend_src_rgb);
@@ -135,7 +141,9 @@
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+ #ifdef glPolygonMode
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+ #endif
// Setup viewport, orthographic projection matrix
// Our visible imgui space lies from draw_data->DisplayPps (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps.
@@ -221,7 +229,9 @@
if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
- glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
+ #ifdef glPolygonMode
+ glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
+ #endif
glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
}
@@ -340,6 +350,35 @@
" gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
"}\n";
+ const GLchar* vertex_shader_glsl_300_es =
+ "precision mediump float;\n"
+ "layout (location = 0) in vec2 Position;\n"
+ "layout (location = 1) in vec2 UV;\n"
+ "layout (location = 2) in vec4 Color;\n"
+ "uniform mat4 ProjMtx;\n"
+ "out vec2 Frag_UV;\n"
+ "out vec4 Frag_Color;\n"
+ "void main()\n"
+ "{\n"
+ " Frag_UV = UV;\n"
+ " Frag_Color = Color;\n"
+ " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+ "}\n";
+
+ const GLchar* vertex_shader_glsl_410_core =
+ "layout (location = 0) in vec2 Position;\n"
+ "layout (location = 1) in vec2 UV;\n"
+ "layout (location = 2) in vec4 Color;\n"
+ "uniform mat4 ProjMtx;\n"
+ "out vec2 Frag_UV;\n"
+ "out vec4 Frag_Color;\n"
+ "void main()\n"
+ "{\n"
+ " Frag_UV = UV;\n"
+ " Frag_Color = Color;\n"
+ " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+ "}\n";
+
const GLchar* fragment_shader_glsl_120 =
"#ifdef GL_ES\n"
" precision mediump float;\n"
@@ -362,10 +401,41 @@
" Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
"}\n";
+ const GLchar* fragment_shader_glsl_300_es =
+ "precision mediump float;\n"
+ "uniform sampler2D Texture;\n"
+ "in vec2 Frag_UV;\n"
+ "in vec4 Frag_Color;\n"
+ "layout (location = 0) out vec4 Out_Color;\n"
+ "void main()\n"
+ "{\n"
+ " Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+ "}\n";
+
+ const GLchar* fragment_shader_glsl_410_core =
+ "in vec2 Frag_UV;\n"
+ "in vec4 Frag_Color;\n"
+ "uniform sampler2D Texture;\n"
+ "layout (location = 0) out vec4 Out_Color;\n"
+ "void main()\n"
+ "{\n"
+ " Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+ "}\n";
+
// Select shaders matching our GLSL versions
const GLchar* vertex_shader = NULL;
const GLchar* fragment_shader = NULL;
- if (glsl_version < 130)
+ if(glsl_version == 410)
+ {
+ vertex_shader = vertex_shader_glsl_410_core;
+ fragment_shader = fragment_shader_glsl_410_core;
+ }
+ else if(glsl_version == 300)
+ {
+ vertex_shader = vertex_shader_glsl_300_es;
+ fragment_shader = fragment_shader_glsl_300_es;
+ }
+ else if (glsl_version < 130)
{
vertex_shader = vertex_shader_glsl_120;
fragment_shader = fragment_shader_glsl_120;
