Zachary Levy
48 lines
1.6 KiB
Metal
48 lines
1.6 KiB
Metal
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct Uniforms
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{
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float2 inv_source_size;
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uint downsample_factor;
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uint _pad0;
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};
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struct main0_out
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{
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float4 out_color [[color(0)]];
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};
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fragment main0_out main0(constant Uniforms& _18 [[buffer(0)]], texture2d<float> source_tex [[texture(0)]], sampler source_texSmplr [[sampler(0)]], float4 gl_FragCoord [[position]])
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{
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main0_out out = {};
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float2 src_block_center = gl_FragCoord.xy * float(_18.downsample_factor);
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if (_18.downsample_factor == 1u)
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{
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float2 uv = src_block_center * _18.inv_source_size;
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out.out_color = source_tex.sample(source_texSmplr, uv);
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}
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else
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{
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if (_18.downsample_factor == 2u)
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{
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float2 uv_1 = src_block_center * _18.inv_source_size;
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out.out_color = source_tex.sample(source_texSmplr, uv_1);
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}
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else
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{
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float off = float(_18.downsample_factor) * 0.25;
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float2 uv_tl = (src_block_center + float2(-off, -off)) * _18.inv_source_size;
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float2 uv_tr = (src_block_center + float2(off, -off)) * _18.inv_source_size;
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float2 uv_bl = (src_block_center + float2(-off, off)) * _18.inv_source_size;
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float2 uv_br = (src_block_center + float2(off)) * _18.inv_source_size;
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float4 c = ((source_tex.sample(source_texSmplr, uv_tl) + source_tex.sample(source_texSmplr, uv_tr)) + source_tex.sample(source_texSmplr, uv_bl)) + source_tex.sample(source_texSmplr, uv_br);
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out.out_color = c * 0.25;
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}
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}
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return out;
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}
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