kc3-lang/SDL/src/render/metal/SDL_shaders_metal.metal

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• Hash : 2a2c8d42
  Author :
  Date : 2016-04-21T03:16:44
  

  Initial shot at a renderer target for Apple's Metal API. This isn't complete, but is enough to run testsprite2. It's currently Mac-only; with a little work to figure out how to properly glue in a Metal layer to a UIView, this will likely work on iOS, too. This is only wired up to the configure script right now, and disabled by default. CMake and Xcode still need their bits filled in as appropriate.

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• src/render/metal/SDL_shaders_metal.metal

• #include <metal_texture>
  
  using namespace metal;
  
  vertex float4 SDL_Simple_vertex(constant float2 *position [[buffer(0)]], uint vid [[vertex_id]])
  {
      return float4(position[vid].x, position[vid].y, 0.0f, 1.0f);
  }
   
  fragment float4 SDL_Simple_fragment(constant float4 &col [[buffer(0)]])
  {
      return col;
  }
  
  struct CopyVertex
  {
      float4 position [[position]];
      float2 texcoord;
  };
  
  vertex CopyVertex SDL_Copy_vertex(constant float2 *position [[buffer(0)]], constant float2 *texcoords [[buffer(1)]], uint vid [[vertex_id]])
  {
      CopyVertex retval;
      retval.position = float4(position[vid].x, position[vid].y, 0.0f, 1.0f);
      retval.texcoord = texcoords[vid];
      return retval;
  }
  
  fragment float4 SDL_Copy_fragment(CopyVertex vert [[stage_in]], constant float4 &col [[buffer(0)]], texture2d<float> tex [[texture(0)]])
  {
      constexpr sampler samp; // !!! FIXME: linear sampling, etc?
      return tex.sample(samp, vert.texcoord) * col;
  }
  
  

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