e75add42c9
These are mapped to Metal's post-tessellation vertex functions. The semantic difference is much less here, so this change should be simpler than the previous one. There are still some hairy parts, though. In MSL, the array of control point data is represented by a special type, `patch_control_point<T>`, where `T` is a valid stage-input type. This object must be embedded inside the patch-level stage input. For this reason, I've added a new type to the type system to represent this. On Mac, the number of input control points to the function must be specified in the `patch()` attribute. This is optional on iOS. SPIRV-Cross takes this from the `OutputVertices` execution mode; the intent is that if it's not set in the shader itself, MoltenVK will set it from the tessellation control shader. If you're translating these offline, you'll have to update the control point count manually, since this number must match the number that is passed to the `drawPatches:...` family of methods. Fixes #120.
46 lines
1.6 KiB
GLSL
46 lines
1.6 KiB
GLSL
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct UBO
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{
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float4x4 uMVP;
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float4 uScale;
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float2 uInvScale;
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float3 uCamPos;
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float2 uPatchSize;
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float2 uInvHeightmapSize;
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};
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struct main0_out
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{
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float3 vWorld [[user(locn0)]];
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float4 vGradNormalTex [[user(locn1)]];
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float4 gl_Position [[position]];
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};
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struct main0_patchIn
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{
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float2 vOutPatchPosBase [[attribute(0)]];
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float4 vPatchLods [[attribute(1)]];
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};
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[[ patch(quad, 0) ]] vertex main0_out main0(main0_patchIn patchIn [[stage_in]], constant UBO& _31 [[buffer(1)]], texture2d<float> uHeightmapDisplacement [[texture(0)]], sampler uHeightmapDisplacementSmplr [[sampler(0)]], float2 gl_TessCoord [[position_in_patch]])
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{
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main0_out out = {};
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float2 _201 = patchIn.vOutPatchPosBase + (gl_TessCoord.xy * _31.uPatchSize);
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float2 _214 = mix(patchIn.vPatchLods.yx, patchIn.vPatchLods.zw, float2(gl_TessCoord.x));
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float _221 = mix(_214.x, _214.y, gl_TessCoord.y);
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float _223 = floor(_221);
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float2 _125 = _201 * _31.uInvHeightmapSize;
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float2 _141 = _31.uInvHeightmapSize * exp2(_223);
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out.vGradNormalTex = float4(_125 + (_31.uInvHeightmapSize * 0.5), _125 * _31.uScale.zw);
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float3 _253 = mix(uHeightmapDisplacement.sample(uHeightmapDisplacementSmplr, (_125 + (_141 * 0.5)), level(_223)).xyz, uHeightmapDisplacement.sample(uHeightmapDisplacementSmplr, (_125 + (_141 * 1.0)), level(_223 + 1.0)).xyz, float3(_221 - _223));
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float2 _171 = (_201 * _31.uScale.xy) + _253.yz;
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out.vWorld = float3(_171.x, _253.x, _171.y);
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out.gl_Position = _31.uMVP * float4(out.vWorld, 1.0);
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return out;
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}
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