1#include <metal_stdlib>
2
3using namespace metal;
4
5// Include header shared between C code and .metal files.
6#include "AAPLShaderTypes.h"
7
8// Include header shared between all .metal files.
9#include "AAPLShaderCommon.h"
10
11struct VertexOutput
12{
13 float4 position [[position]];
14};
15
16// A depth pre-pass is necessary in forward plus rendering to produce
17// minimum and maximum depth bounds for light culling.
18vertex VertexOutput depth_pre_pass_vertex(Vertex in [[ stage_in ]],
19 constant AAPLFrameData & frameData [[ buffer(AAPLBufferIndexFrameData) ]])
20{
21 // Make the position a float4 to perform 4x4 matrix math on it.
22 VertexOutput out;
23 float4 position = float4(in.position, 1.0);
24
25 // Calculate the position in clip space.
26 out.position = frameData.projectionMatrix * frameData.modelViewMatrix * position;
27
28 return out;
29}
30
31fragment ColorData depth_pre_pass_fragment(VertexOutput in [[ stage_in ]])
32{
33 // Populate on-tile geometry buffer data.
34 ColorData f;
35
36 // Setting color in the depth pre-pass is unnecessary, but may make debugging easier.
37 // f.lighting = half4(0, 0, 0, 1);
38
39 // Set the depth in clip space, which you use in `AAPLCulling` to perform per-tile light culling.
40 f.depth = in.position.z;
41
42 return f;
43}
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