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[Impeller] Fix GLES gaussian implementation. #55329
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| Original file line number | Diff line number | Diff line change |
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@@ -22,6 +22,11 @@ struct BlurParameters { | |
| int step_size; | ||
| }; | ||
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| struct KernelSample { | ||
| Vector2 uv_offset; | ||
| float coefficient; | ||
| }; | ||
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| /// A larger mirror of GaussianBlurPipeline::FragmentShader::KernelSamples. | ||
| /// | ||
| /// This is a mirror of GaussianBlurPipeline::FragmentShader::KernelSamples that | ||
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@@ -30,14 +35,14 @@ struct BlurParameters { | |
| struct KernelSamples { | ||
| static constexpr int kMaxKernelSize = kGaussianBlurMaxKernelSize * 2; | ||
| int sample_count; | ||
| KernelSample samples[kMaxKernelSize]; | ||
| }; | ||
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| KernelSamples GenerateBlurInfo(BlurParameters parameters); | ||
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| /// This will shrink the size of a kernel by roughly half by sampling between | ||
| /// samples and relying on linear interpolation between the samples. | ||
| GaussianBlurPipeline::FragmentShader::BlurInfo LerpHackKernelSamples( | ||
| KernelSamples samples); | ||
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| /// Performs a bidirectional Gaussian blur. | ||
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@@ -508,27 +508,24 @@ TEST(GaussianBlurFilterContentsTest, LerpHackKernelSamplesSimple) { | |||||
| }, | ||||||
| }; | ||||||
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| GaussianBlurPipeline::FragmentShader::BlurInfo blur_info = | ||||||
| LerpHackKernelSamples(kernel_samples); | ||||||
| EXPECT_EQ(blur_info.sample_count, 3); | ||||||
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| KernelSample* samples = kernel_samples.samples; | ||||||
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| ////////////////////////////////////////////////////////////////////////////// | ||||||
| // Check output kernel. | ||||||
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| EXPECT_FLOAT_EQ(blur_info.sample_data[0].x, -1.3333333); | ||||||
| EXPECT_FLOAT_EQ(blur_info.sample_data[0].y, 0); | ||||||
| EXPECT_FLOAT_EQ(blur_info.sample_data[0].z, 0.3); | ||||||
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| EXPECT_FLOAT_EQ(blur_info.sample_data[0].z, 0.3); | |
| EXPECT_FLOAT_EQ(GetCoefficient(blur_info.sample_data[0]), 0.3); |
I think we would be better off not losing the names of values. It's very confusing to have to remember that .z means "get the coefficient". Can we codify that into some tiny functions?
Same thing for uv_offset.
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@@ -11,14 +11,11 @@ uniform f16sampler2D texture_sampler; | |
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| layout(constant_id = 0) const float supports_decal = 1.0; | ||
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| uniform BlurInfo { | ||
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| float sample_count; | ||
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| // X, Y are uv offset and Z is Coefficient. W is padding. | ||
| vec4 sample_data[50]; | ||
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| } | ||
| blur_info; | ||
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@@ -36,11 +33,11 @@ out f16vec4 frag_color; | |
| void main() { | ||
| f16vec4 total_color = f16vec4(0.0hf); | ||
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| for (int i = 0; i < int(blur_info.sample_count); i++) { | ||
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| float16_t coefficient = float16_t(blur_info.sample_data[i].z); | ||
| total_color += | ||
| coefficient * | ||
| Sample(texture_sampler, v_texture_coords + blur_info.sample_data[i].xy); | ||
| } | ||
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| frag_color = total_color; | ||
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@@ -310,6 +310,8 @@ struct Vector4 { | |
| return *this + (v - *this) * t; | ||
| } | ||
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| constexpr Vector2 xy() const { return Vector2(x, y); } | ||
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| std::string ToString() const; | ||
| }; | ||
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@@ -279,20 +279,19 @@ bool BufferBindingsGLES::BindUniformBuffer(const ProcTableGLES& gl, | |
| auto* buffer_data = | ||
| reinterpret_cast<const GLfloat*>(buffer_ptr + member.offset); | ||
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| // When binding uniform arrays, the elements must be contiguous. Copy | ||
| // the uniforms to a temp buffer to eliminate any padding needed by the | ||
| // other backends if the array elements have padding. | ||
| if (element_count > 1 && element_stride != member.size) { | ||
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| array_element_buffer_.resize(member.size * element_count); | ||
| for (size_t element_i = 0; element_i < element_count; element_i++) { | ||
| std::memcpy(array_element_buffer_.data() + element_i * member.size, | ||
| reinterpret_cast<const char*>(buffer_data) + | ||
| element_i * element_stride, | ||
| member.size); | ||
| } | ||
| buffer_data = | ||
| reinterpret_cast<const GLfloat*>(array_element_buffer_.data()); | ||
| } | ||
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| switch (member.type) { | ||
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@@ -57,6 +57,7 @@ class BufferBindingsGLES { | |
| std::vector<VertexAttribPointer> vertex_attrib_arrays_; | ||
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| std::unordered_map<std::string, GLint> uniform_locations_; | ||
| std::vector<uint8_t> array_element_buffer_; | ||
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| using BindingMap = std::unordered_map<std::string, std::vector<GLint>>; | ||
| BindingMap binding_map_ = {}; | ||
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@@ -2581,9 +2581,9 @@ | |
| "arith_cvt" | ||
| ], | ||
| "shortest_path_cycles": [ | ||
| 0.09375, | ||
| 0.0, | ||
| 0.09375, | ||
| 0.0, | ||
| 0.0, | ||
| 0.0, | ||
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@@ -2593,11 +2593,11 @@ | |
| "load_store" | ||
| ], | ||
| "total_cycles": [ | ||
| 0.265625, | ||
| 0.09375, | ||
| 0.265625, | ||
| 0.0, | ||
| 1.0, | ||
| 0.25, | ||
| 0.25 | ||
| ] | ||
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@@ -2641,10 +2641,11 @@ | |
| 0.0 | ||
| ], | ||
| "total_bound_pipelines": [ | ||
| "arithmetic", | ||
| "load_store" | ||
| ], | ||
| "total_cycles": [ | ||
| 2.0, | ||
| 2.0, | ||
| 1.0 | ||
| ] | ||
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Please bring back this check. It's important because we'll crash anyways if we violate this.
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This is checked in the LerpHackFunction too, I don't think the count can change after that point?
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Okay yea, in that case I'd rather keep this one here since it is the final point before we'd actually get the error. We can remove the lerp hack one.
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But the kernel samples UBO has a std::array of a fixed size. It cannot be greater than kGaussianBlurMaxKernelSize
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I could static assert this though.
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Ah yea, the
sample_countisn't even consequential here because emplace isn't looking at it. Lets keep the runtime DCHECK in the lerp hack and a static assert sounds good to me.There was a problem hiding this comment.
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Done