67 lines
1.7 KiB
Metal
67 lines
1.7 KiB
Metal
#include <metal_stdlib>
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using namespace metal;
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struct VertexInput {
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float2 position;
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float2 tex_coord;
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};
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struct VertexOutput {
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float4 position [[position]];
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float2 tex_coord;
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};
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struct Glyph {
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float2 atlas_position;
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float2 size;
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float2 target_position;
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float y_offset;
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float _haha_alignment;
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};
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struct UniformParams {
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float2 screen_size;
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};
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float4 to_device_position(float2 position, float2 size) {
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return float4(((position / size) * 2.0) - float2(1.0), 1.0, 1.0);
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}
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vertex VertexOutput
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vs_main(
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uint vertex_id [[vertex_id]],
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uint glyph_id [[instance_id]],
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constant VertexInput *vertices [[buffer(0)]],
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constant Glyph *glyphs [[buffer(1)]],
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constant UniformParams ¶ms [[buffer(2)]]
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)
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{
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VertexOutput out;
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Glyph glyph = glyphs[glyph_id];
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float2 scaled_size = ((vertices[vertex_id].position + 1.0) / 2.0) * (glyph.size/2.0);
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float2 scaled_size_2 = ((vertices[vertex_id].position + 1.0) / 2.0) * (glyph.size);
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float2 glyph_pos = scaled_size + glyph.target_position + float2(0, glyph.y_offset/2.0+32);
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float4 device_position = to_device_position(glyph_pos, params.screen_size);
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float2 atlas_position = (scaled_size_2 + glyph.atlas_position) / 1024.0;
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device_position.y = -device_position.y;
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out.position = device_position;
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out.tex_coord = atlas_position;
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return out;
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}
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fragment float4 fs_main(VertexOutput in [[stage_in]],
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texture2d<float, access::sample> texture [[texture(0)]])
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{
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constexpr sampler texture_sampler (mag_filter::linear, min_filter::linear);
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float text_color = texture.sample(texture_sampler, in.tex_coord).r;
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return float4(text_color * float3(1,1,1), text_color);
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}
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