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Moving viewport transform to vertex shaders.

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This commit is contained in:
Ben Vanik
2014-01-20 10:46:43 -08:00
parent 7b9a804fc0
commit 0efd7b4a62
4 changed files with 65 additions and 46 deletions
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23
src/xenia/gpu/d3d11/d3d11_shader.cc
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@@ -393,6 +393,28 @@ const char* D3D11VertexShader::Translate(xe_gpu_program_cntl_t* program_cntl) {
"};\n");
// TODO(benvanik): add bool/loop constants.
// Transform utilities. We adjust the output position in various ways
// as we can't do this via D3D11 APIs.
output->append(
"cbuffer vs_consts : register(b3) {\n"
" float4 window;\n" // x,y,w,h
" float4 viewport_z_enable;\n" // min,(max - min),?,enabled
" float4 viewport_size;\n" // x,y,w,h
"};"
"float4 applyViewport(float4 pos) {\n"
" if (viewport_z_enable.w) {\n"
//" pos.x = (pos.x + 1) * viewport_size.z * 0.5 + viewport_size.x;\n"
//" pos.y = (1 - pos.y) * viewport_size.w * 0.5 + viewport_size.y;\n"
//" pos.z = viewport_z_enable.x + pos.z * viewport_z_enable.y;\n"
// w?
" } else {\n"
" pos.xy = pos.xy / float2(window.z / 2.0, -window.w / 2.0) + float2(-1.0, 1.0);\n"
" pos.zw = float2(0.0, 1.0);\n"
" }\n"
" pos.xy += window.xy;\n"
" return pos;\n"
"}\n");
// Add vertex shader input.
output->append(
"struct VS_INPUT {\n");
@@ -472,6 +494,7 @@ const char* D3D11VertexShader::Translate(xe_gpu_program_cntl_t* program_cntl) {
// main footer.
output->append(
" o.oPos = applyViewport(o.oPos);\n"
" return o;\n"
"};\n");