| /* |
| * Copyright 2023 Rive |
| */ |
| |
| #ifdef @DRAW_PATH |
| #ifdef @VERTEX |
| ATTR_BLOCK_BEGIN(Attrs) |
| // [localVertexID, outset, fillCoverage, vertexType] |
| ATTR(0, float4, @a_patchVertexData); |
| ATTR(1, float4, @a_mirroredVertexData); |
| ATTR_BLOCK_END |
| #endif |
| |
| VARYING_BLOCK_BEGIN |
| FLAT VARYING(0, ushort, v_pathID); |
| NO_PERSPECTIVE VARYING(1, float4, v_coverages); |
| NO_PERSPECTIVE VARYING(2, float2, v_atlasCoord); |
| FLAT VARYING(3, uint2, v_coveragePlacement); |
| VARYING(4, float2, v_coverageCoord); |
| VARYING_BLOCK_END |
| |
| #ifdef @VERTEX |
| VERTEX_MAIN(@drawVertexMain, Attrs, attrs, _vertexID, _instanceID) |
| { |
| ATTR_UNPACK(_vertexID, attrs, @a_patchVertexData, float4); |
| ATTR_UNPACK(_vertexID, attrs, @a_mirroredVertexData, float4); |
| |
| VARYING_INIT(v_pathID, ushort); |
| VARYING_INIT(v_coverages, float4); |
| VARYING_INIT(v_coveragePlacement, uint2); |
| VARYING_INIT(v_coverageCoord, float2); |
| |
| float4 pos; |
| uint pathID; |
| float2 vertexPosition; |
| if (unpack_tessellated_path_vertex(@a_patchVertexData, |
| @a_mirroredVertexData, |
| _instanceID, |
| pathID, |
| vertexPosition, |
| v_coverages VERTEX_CONTEXT_UNPACK)) |
| { |
| uint4 coverageData = |
| STORAGE_BUFFER_LOAD4(@pathBuffer, pathID * 4u + 3u); |
| v_pathID = pathID; |
| v_coveragePlacement = coverageData.xy; |
| v_coverageCoord = vertexPosition + uintBitsToFloat(coverageData.zw); |
| pos = RENDER_TARGET_COORD_TO_CLIP_COORD(vertexPosition); |
| } |
| else |
| { |
| pos = float4(uniforms.vertexDiscardValue, |
| uniforms.vertexDiscardValue, |
| uniforms.vertexDiscardValue, |
| uniforms.vertexDiscardValue); |
| } |
| |
| VARYING_PACK(v_pathID); |
| VARYING_PACK(v_coverages); |
| VARYING_PACK(v_coveragePlacement); |
| VARYING_PACK(v_coverageCoord); |
| EMIT_VERTEX(pos); |
| } |
| #endif // VERTEX |
| #endif // DRAW_PATH |
| |
| #ifdef @DRAW_INTERIOR_TRIANGLES |
| #ifdef @VERTEX |
| ATTR_BLOCK_BEGIN(Attrs) |
| ATTR(0, packed_float3, @a_triangleVertex); |
| ATTR_BLOCK_END |
| #endif |
| |
| VARYING_BLOCK_BEGIN |
| FLAT VARYING(0, ushort, v_pathID); |
| #ifdef @ATLAS_BLIT |
| NO_PERSPECTIVE VARYING(1, float2, v_atlasCoord); |
| #else |
| @OPTIONALLY_FLAT VARYING(1, half, v_windingWeight); |
| FLAT VARYING(2, uint2, v_coveragePlacement); |
| VARYING(3, float2, v_coverageCoord); |
| #endif |
| VARYING_BLOCK_END |
| |
| #ifdef @VERTEX |
| VERTEX_MAIN(@drawVertexMain, Attrs, attrs, _vertexID, _instanceID) |
| { |
| ATTR_UNPACK(_vertexID, attrs, @a_triangleVertex, float3); |
| |
| #ifdef @ATLAS_BLIT |
| VARYING_INIT(v_atlasCoord, float2); |
| #else |
| #endif |
| VARYING_INIT(v_pathID, ushort); |
| #ifdef @ATLAS_BLIT |
| VARYING_INIT(v_atlasCoord, float2); |
| #else |
| VARYING_INIT(v_windingWeight, half); |
| VARYING_INIT(v_coveragePlacement, uint2); |
| VARYING_INIT(v_coverageCoord, float2); |
| #endif |
| |
| uint pathID; |
| float2 vertexPosition; |
| #ifdef @ATLAS_BLIT |
| vertexPosition = |
| unpack_atlas_coverage_vertex(@a_triangleVertex, |
| pathID, |
| v_atlasCoord VERTEX_CONTEXT_UNPACK); |
| #else |
| vertexPosition = |
| unpack_interior_triangle_vertex(@a_triangleVertex, |
| pathID, |
| v_windingWeight VERTEX_CONTEXT_UNPACK); |
| uint4 coverageData = STORAGE_BUFFER_LOAD4(@pathBuffer, pathID * 4u + 3u); |
| v_coveragePlacement = coverageData.xy; |
| v_coverageCoord = vertexPosition + uintBitsToFloat(coverageData.zw); |
| #endif |
| v_pathID = cast_uint_to_ushort(pathID); |
| float4 pos = RENDER_TARGET_COORD_TO_CLIP_COORD(vertexPosition); |
| |
| VARYING_PACK(v_pathID); |
| #ifdef @ATLAS_BLIT |
| VARYING_PACK(v_atlasCoord); |
| #else |
| VARYING_PACK(v_windingWeight); |
| VARYING_PACK(v_coveragePlacement); |
| VARYING_PACK(v_coverageCoord); |
| #endif |
| |
| EMIT_VERTEX(pos); |
| } |
| #endif // VERTEX |
| #endif // DRAW_INTERIOR_TRIANGLES |
| |
| #ifdef @FRAGMENT |
| FRAG_STORAGE_BUFFER_BLOCK_BEGIN |
| STORAGE_BUFFER_U32x2(PAINT_BUFFER_IDX, PaintBuffer, @paintBuffer); |
| STORAGE_BUFFER_F32x4(PAINT_AUX_BUFFER_IDX, PaintAuxBuffer, @paintAuxBuffer); |
| STORAGE_BUFFER_U32_ATOMIC(COVERAGE_BUFFER_IDX, CoverageBuffer, coverageBuffer); |
| FRAG_STORAGE_BUFFER_BLOCK_END |
| |
| #ifdef @BORROWED_COVERAGE_PREPASS |
| INLINE void apply_borrowed_coverage(half borrowedCoverage, uint coverageIndex) |
| { |
| // Try to apply borrowedCoverage, assuming the existing coverage value |
| // is zero. |
| uint borrowedCoverageFixed = |
| uint(abs(borrowedCoverage) * CLOCKWISE_COVERAGE_PRECISION + .5); |
| uint targetCoverageValue = |
| uniforms.coverageBufferPrefix | |
| (CLOCKWISE_FILL_ZERO_VALUE - borrowedCoverageFixed); |
| uint coverageBeforeMax = STORAGE_BUFFER_ATOMIC_MAX(coverageBuffer, |
| coverageIndex, |
| targetCoverageValue); |
| if (coverageBeforeMax >= uniforms.coverageBufferPrefix) |
| { |
| // Coverage was not zero. Undo the atomicMax and then subtract |
| // borrowedCoverageFixed this time. |
| uint undoAtomicMax = |
| coverageBeforeMax - max(coverageBeforeMax, targetCoverageValue); |
| STORAGE_BUFFER_ATOMIC_ADD(coverageBuffer, |
| coverageIndex, |
| undoAtomicMax - borrowedCoverageFixed); |
| } |
| } |
| #endif |
| |
| INLINE void apply_stroke_coverage(INOUT(float) paintAlpha, |
| half fragCoverage, |
| uint coverageIndex) |
| { |
| if (min(paintAlpha, fragCoverage) >= 1.) |
| { |
| // Solid stroke pixels don't need to work out coverage at all. We can |
| // just blast them out without ever touching the coverage buffer. |
| return; |
| } |
| |
| half X; |
| uint fragCoverageFixed = |
| uint(abs(fragCoverage) * CLOCKWISE_COVERAGE_PRECISION + .5); |
| uint coverageBeforeMax = STORAGE_BUFFER_ATOMIC_MAX( |
| coverageBuffer, |
| coverageIndex, |
| uniforms.coverageBufferPrefix | fragCoverageFixed); |
| if (coverageBeforeMax < uniforms.coverageBufferPrefix) |
| { |
| // This is the first fragment of the stroke to touch this pixel. Just |
| // multiply in our coverage and write it out. |
| X = fragCoverage; |
| } |
| else |
| { |
| // This pixel has been touched previously by a fragment in the stroke. |
| // Multiply in an incremental coverage value that mixes with what's |
| // already in the framebuffer. |
| half c1 = |
| cast_uint_to_half(coverageBeforeMax & CLOCKWISE_COVERAGE_MASK) * |
| CLOCKWISE_COVERAGE_INVERSE_PRECISION; |
| half c2 = max(c1, fragCoverage); |
| X = (c2 - c1) / (1. - c1 * paintAlpha); |
| } |
| |
| paintAlpha *= X; |
| } |
| |
| INLINE void apply_fill_coverage(INOUT(float) paintAlpha, |
| half fragCoverageRemaining, |
| uint coverageIndex) |
| { |
| uint coverageInitialValue = |
| STORAGE_BUFFER_LOAD(coverageBuffer, coverageIndex); |
| if (min(paintAlpha, fragCoverageRemaining) >= 1. && |
| (coverageInitialValue < uniforms.coverageBufferPrefix || |
| coverageInitialValue >= |
| (uniforms.coverageBufferPrefix | CLOCKWISE_FILL_ZERO_VALUE))) |
| { |
| // If we're solid, AND the current coverage at this pixel is >= 0, then |
| // we can just write out or color without working out coverage any |
| // further. |
| return; |
| } |
| |
| half X = .0; // Amount by which to multiply paintAlpha. |
| uint fragCoverageRemainingFixed = |
| uint(abs(fragCoverageRemaining) * CLOCKWISE_COVERAGE_PRECISION + .5); |
| if (coverageInitialValue < uniforms.coverageBufferPrefix) |
| { |
| // The initial coverage value does not belong to this path. We *might* |
| // be the first fragment of the path to touch this pixel. Attempt to |
| // write out our coverage with an atomicMax. |
| uint targetCoverage = |
| uniforms.coverageBufferPrefix | |
| (CLOCKWISE_FILL_ZERO_VALUE + fragCoverageRemainingFixed); |
| uint coverageBeforeMax = STORAGE_BUFFER_ATOMIC_MAX(coverageBuffer, |
| coverageIndex, |
| targetCoverage); |
| if (coverageBeforeMax <= uniforms.coverageBufferPrefix) |
| { |
| // Success! We were the first fragment of the path at this pixel. |
| X = fragCoverageRemaining; // Just multiply paintAlpha by coverage. |
| #ifdef @DRAW_INTERIOR_TRIANGLES |
| X = min(X, 1.); |
| #endif |
| fragCoverageRemaining = .0; // We're done. |
| } |
| else if (coverageBeforeMax < targetCoverage) |
| { |
| // We were not first fragment of the path at this pixel, AND our |
| // atomicMax had an effect that we now have to account for in |
| // paintAlpha. Coverage increased from "coverageBeforeMax" to |
| // "fragCoverageRemaining". |
| // |
| // NOTE: because we know coverage was initially zero, and because |
| // coverage is always positive in this pass, we know |
| // coverageBeforeMax >= 0. |
| uint c1Fixed = (coverageBeforeMax & CLOCKWISE_COVERAGE_MASK) - |
| CLOCKWISE_FILL_ZERO_VALUE; |
| half c1 = cast_uint_to_half(c1Fixed) * |
| CLOCKWISE_COVERAGE_INVERSE_PRECISION; |
| half c2 = fragCoverageRemaining; |
| #ifdef @DRAW_INTERIOR_TRIANGLES |
| c2 = min(c2, 1.); |
| #endif |
| // Apply the coverage increase from the atomicMax here. The next |
| // step will apply the remaining increase. |
| X = (c2 - c1) / (1. - c1 * paintAlpha); |
| |
| // We increased coverage by an amount of "fragCoverageRemaining" - |
| // "coverageBeforeMax". However, we wanted to increase coverage by |
| // "fragCoverageRemaining". So the remaining amount we still need to |
| // increase by is "coverageBeforeMax". |
| fragCoverageRemainingFixed = c1Fixed; |
| fragCoverageRemaining = c1; |
| } |
| } |
| |
| if (fragCoverageRemaining > .0) |
| { |
| // At this point we know the value in the coverage buffer belongs to |
| // this path, so we can do a simple atomicAdd. |
| uint coverageBeforeAdd = |
| STORAGE_BUFFER_ATOMIC_ADD(coverageBuffer, |
| coverageIndex, |
| fragCoverageRemainingFixed); |
| half c1 = |
| cast_int_to_half(int((coverageBeforeAdd & CLOCKWISE_COVERAGE_MASK) - |
| CLOCKWISE_FILL_ZERO_VALUE)) * |
| CLOCKWISE_COVERAGE_INVERSE_PRECISION; |
| half c2 = c1 + fragCoverageRemaining; |
| c1 = clamp(c1, .0, 1.); |
| c2 = clamp(c2, .0, 1.); |
| // Apply the coverage increase from c1 -> c2 that we just did, in |
| // addition to any coverage that had been applied previously. |
| half one_minus_c1a = 1. - c1 * paintAlpha; |
| if (one_minus_c1a <= .0) |
| discard; |
| X += (1. - X * paintAlpha) * (c2 - c1) / one_minus_c1a; |
| } |
| |
| paintAlpha *= X; |
| } |
| |
| FRAG_DATA_MAIN(half4, @drawFragmentMain) |
| { |
| VARYING_UNPACK(v_pathID, ushort); |
| #ifdef DRAW_PATH |
| VARYING_UNPACK(v_coverages, float4); |
| #elif defined(@ATLAS_BLIT) |
| VARYING_UNPACK(v_atlasCoord, float2); |
| #else |
| VARYING_UNPACK(v_windingWeight, half); |
| #endif |
| #ifndef @ATLAS_BLIT |
| VARYING_UNPACK(v_coveragePlacement, uint2); |
| VARYING_UNPACK(v_coverageCoord, float2); |
| #endif |
| |
| half4 paintColor; |
| uint pathID = v_pathID; |
| uint2 paintData = STORAGE_BUFFER_LOAD2(@paintBuffer, pathID); |
| uint paintType = paintData.x & 0xfu; |
| if (paintType <= SOLID_COLOR_PAINT_TYPE) // CLIP_UPDATE_PAINT_TYPE or |
| // SOLID_COLOR_PAINT_TYPE |
| { |
| paintColor = unpackUnorm4x8(paintData.y); |
| } |
| else // LINEAR_GRADIENT_PAINT_TYPE, |
| // RADIAL_GRADIENT_PAINT_TYPE, or |
| // IMAGE_PAINT_TYPE |
| { |
| float2x2 M = |
| make_float2x2(STORAGE_BUFFER_LOAD4(@paintAuxBuffer, pathID * 4u)); |
| float4 translate = |
| STORAGE_BUFFER_LOAD4(@paintAuxBuffer, pathID * 4u + 1u); |
| float2 paintCoord = MUL(M, _fragCoord) + translate.xy; |
| if (paintType != IMAGE_PAINT_TYPE) |
| { |
| float t = paintType == LINEAR_GRADIENT_PAINT_TYPE |
| ? /*linear*/ paintCoord.x |
| : /*radial*/ length(paintCoord); |
| t = clamp(t, .0, 1.); |
| float x = t * translate.z + translate.w; |
| float y = uintBitsToFloat(paintData.y); |
| paintColor = |
| TEXTURE_SAMPLE_LOD(@gradTexture, gradSampler, float2(x, y), .0); |
| } |
| else |
| { |
| float opacity = uintBitsToFloat(paintData.y); |
| float lod = translate.z; |
| paintColor = TEXTURE_SAMPLE_LOD(@imageTexture, |
| imageSampler, |
| paintCoord, |
| lod); |
| paintColor = |
| make_half4(unmultiply_rgb(paintColor), paintColor.a * opacity); |
| } |
| } |
| |
| if (paintColor.a == .0) |
| { |
| discard; |
| } |
| |
| #ifdef @ATLAS_BLIT |
| paintColor.a *= filter_feather_atlas( |
| v_atlasCoord, |
| uniforms.atlasTextureInverseSize TEXTURE_CONTEXT_FORWARD); |
| #else |
| // Swizzle the coverage buffer in a tiled format, starting with 32x32 |
| // row-major tiles. |
| uint coverageIndex = v_coveragePlacement.x; |
| uint coveragePitch = v_coveragePlacement.y; |
| uint2 coverageCoord = uint2(floor(v_coverageCoord)); |
| coverageIndex += (coverageCoord.y >> 5) * (coveragePitch << 5) + |
| (coverageCoord.x >> 5) * (32 << 5); |
| // Subdivide each main tile into 4x4 column-major tiles. |
| coverageIndex += ((coverageCoord.x & 0x1f) >> 2) * (32 << 2) + |
| ((coverageCoord.y & 0x1f) >> 2) * (4 << 2); |
| // Let the 4x4 tiles be row-major. |
| coverageIndex += (coverageCoord.y & 0x3) * 4 + (coverageCoord.x & 0x3); |
| |
| #ifdef @BORROWED_COVERAGE_PREPASS |
| if (@BORROWED_COVERAGE_PREPASS) |
| { |
| #ifdef @DRAW_INTERIOR_TRIANGLES |
| half borrowedCoverage = -v_windingWeight; |
| #else |
| half fragCoverage; |
| #ifdef @ENABLE_FEATHER |
| if (@ENABLE_FEATHER && is_feathered_fill(v_coverages)) |
| { |
| fragCoverage = |
| eval_feathered_fill(v_coverages TEXTURE_CONTEXT_FORWARD); |
| } |
| else |
| #endif |
| { |
| fragCoverage = v_coverages.x; |
| } |
| half borrowedCoverage = max(-fragCoverage, .0); |
| #endif |
| apply_borrowed_coverage(borrowedCoverage, coverageIndex); |
| discard; |
| } |
| #endif // BORROWED_COVERAGE_PREPASS |
| |
| #ifndef @DRAW_INTERIOR_TRIANGLES |
| if (is_stroke(v_coverages)) |
| { |
| half fragCoverage; |
| #ifdef @ENABLE_FEATHER |
| if (@ENABLE_FEATHER && is_feathered_stroke(v_coverages)) |
| { |
| fragCoverage = |
| eval_feathered_stroke(v_coverages TEXTURE_CONTEXT_FORWARD); |
| } |
| else |
| #endif |
| { |
| fragCoverage = min(v_coverages.x, v_coverages.y); |
| } |
| fragCoverage = clamp(fragCoverage, .0, 1.); |
| apply_stroke_coverage(paintColor.a, fragCoverage, coverageIndex); |
| } |
| else // It's a fill. |
| #endif // !DRAW_INTERIOR_TRIANGLES |
| { |
| #ifdef @DRAW_INTERIOR_TRIANGLES |
| half fragCoverage = v_windingWeight; |
| #else |
| half fragCoverage; |
| #ifdef @ENABLE_FEATHER |
| if (@ENABLE_FEATHER && is_feathered_fill(v_coverages)) |
| { |
| fragCoverage = |
| eval_feathered_fill(v_coverages TEXTURE_CONTEXT_FORWARD); |
| } |
| else |
| #endif |
| { |
| fragCoverage = v_coverages.x; |
| } |
| fragCoverage = clamp(fragCoverage, .0, 1.); |
| #endif |
| apply_fill_coverage(paintColor.a, fragCoverage, coverageIndex); |
| } |
| #endif // @ATLAS_BLIT |
| |
| EMIT_FRAG_DATA(paintColor); |
| } |
| #endif // FRAGMENT |
