65 lines
1.8 KiB
Text
65 lines
1.8 KiB
Text
#version 450
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#extension GL_EXT_scalar_block_layout : require
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layout(
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local_size_x = 8,
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local_size_y = 8,
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local_size_z = 1) in;
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const int MaxLayers = 4;
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layout(constant_id = 0) const int c_layerCount = 1;
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layout(constant_id = 1) const bool c_swapChannels = false;
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layout(constant_id = 2) const uint c_ycbcrMask = 0;
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layout(binding = 0, rgba8) writeonly uniform image2D dst;
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layout(std430, binding = 1)
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uniform layers_t {
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vec2 u_scale[MaxLayers];
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vec2 u_offset[MaxLayers];
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float u_opacity[MaxLayers];
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};
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layout(binding = 2) uniform sampler2D s_samplers[MaxLayers];
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layout(binding = 6) uniform sampler2D s_ycbcr_samplers[MaxLayers];
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vec4 sampleLayer(uint layerIdx, vec2 uv) {
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vec2 coord = (uv + u_offset[layerIdx]) * u_scale[layerIdx];
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if ((c_ycbcrMask & (1 << layerIdx)) != 0)
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return texture(s_ycbcr_samplers[layerIdx], coord);
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else
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return texture(s_samplers[layerIdx], coord);
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}
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void main() {
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uvec2 coord = uvec2(gl_GlobalInvocationID.x, gl_GlobalInvocationID.y);
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uvec2 outSize = imageSize(dst);
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if (coord.x >= outSize.x || coord.y >= outSize.y)
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return;
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vec2 uv = vec2(coord);
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vec4 outputValue = vec4(0.0f);
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if (c_layerCount > 0)
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outputValue = sampleLayer(0, uv);
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for (int i = 1; i < c_layerCount; i++) {
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vec4 layerColor = sampleLayer(i, uv);
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float layerAlpha = u_opacity[i] * layerColor.a;
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outputValue = layerColor * layerAlpha + outputValue * (1.0f - layerAlpha);
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}
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if (c_swapChannels)
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outputValue = outputValue.bgra;
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imageStore(dst, ivec2(coord), outputValue);
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// Indicator to quickly tell if we're in the compositing path or not.
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if (false && coord.x > 50 && coord.x < 100 && coord.y > 50 && coord.y < 100)
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imageStore(dst, ivec2(coord), vec4(1.0f, 0.0f, 1.0f, 1.0f));
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}
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