SameBoy/Shaders/MasterShader.metal

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Metal
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#include <metal_stdlib>
#include <simd/simd.h>
#include <metal_math>
using namespace metal;
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const float4 input_resolution = float4(160, 144);
/* For GLSL compatibility */
typedef float2 vec2;
typedef float3 vec3;
typedef float4 vec4;
typedef struct {
float4 position [[position]];
float2 texcoords;
} rasterizer_data;
// Vertex Function
vertex rasterizer_data vertex_shader(uint index [[ vertex_id ]],
constant vector_float2 *vertices [[ buffer(0) ]])
{
rasterizer_data out;
out.position.xy = vertices[index].xy;
out.position.z = 0.0;
out.position.w = 1.0;
out.texcoords = (vertices[index].xy + float2(1, 1)) / 2.0;
return out;
}
static inline float4 texture(texture2d<half> texture, float2 pos)
{
constexpr sampler texture_sampler;
return float4(texture.sample(texture_sampler, pos));
}
fragment float4 fragment_shader(rasterizer_data in [[stage_in]],
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texture2d<half> image [[ texture(0) ]],
texture2d<half> previous_image [[ texture(1) ]],
constant bool *mix_previous [[ buffer(0) ]])
{
in.texcoords.y = 1 - in.texcoords.y;
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if (*mix_previous) {
return mix(texture(image, in.texcoords), texture(previous_image, in.texcoords), 0.5);
}
return texture(image, in.texcoords);
}