83 lines
1.9 KiB
GLSL
83 lines
1.9 KiB
GLSL
#[compute]
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#version 450
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VERSION_DEFINES
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#define BLOCK_SIZE 8
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layout(local_size_x = BLOCK_SIZE, local_size_y = BLOCK_SIZE, local_size_z = 1) in;
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shared float tmp_data[BLOCK_SIZE * BLOCK_SIZE];
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#ifdef READ_TEXTURE
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//use for main texture
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layout(set = 0, binding = 0) uniform sampler2D source_texture;
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#else
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//use for intermediate textures
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layout(r32f, set = 0, binding = 0) uniform restrict readonly image2D source_luminance;
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#endif
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layout(r32f, set = 1, binding = 0) uniform restrict writeonly image2D dest_luminance;
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#ifdef WRITE_LUMINANCE
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layout(set = 2, binding = 0) uniform sampler2D prev_luminance;
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#endif
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layout(push_constant, binding = 1, std430) uniform Params {
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ivec2 source_size;
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float max_luminance;
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float min_luminance;
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float exposure_adjust;
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float pad[3];
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}
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params;
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void main() {
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uint t = gl_LocalInvocationID.y * BLOCK_SIZE + gl_LocalInvocationID.x;
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ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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if (any(lessThan(pos, params.source_size))) {
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#ifdef READ_TEXTURE
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vec3 v = texelFetch(source_texture, pos, 0).rgb;
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tmp_data[t] = max(v.r, max(v.g, v.b));
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#else
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tmp_data[t] = imageLoad(source_luminance, pos).r;
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#endif
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} else {
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tmp_data[t] = 0.0;
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}
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groupMemoryBarrier();
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barrier();
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uint size = (BLOCK_SIZE * BLOCK_SIZE) >> 1;
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do {
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if (t < size) {
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tmp_data[t] += tmp_data[t + size];
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}
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groupMemoryBarrier();
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barrier();
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size >>= 1;
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} while (size >= 1);
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if (t == 0) {
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//compute rect size
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ivec2 rect_size = min(params.source_size - pos, ivec2(BLOCK_SIZE));
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float avg = tmp_data[0] / float(rect_size.x * rect_size.y);
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//float avg = tmp_data[0] / float(BLOCK_SIZE*BLOCK_SIZE);
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pos /= ivec2(BLOCK_SIZE);
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#ifdef WRITE_LUMINANCE
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float prev_lum = texelFetch(prev_luminance, ivec2(0, 0), 0).r; //1 pixel previous exposure
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avg = clamp(prev_lum + (avg - prev_lum) * params.exposure_adjust, params.min_luminance, params.max_luminance);
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#endif
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imageStore(dest_luminance, pos, vec4(avg));
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}
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}
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