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Implementing alpha testing.

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This commit is contained in:
Ben Vanik
2015-03-20 20:12:27 -07:00
parent a82587f943
commit f7d0c427be
4 changed files with 56 additions and 24 deletions
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36
src/xenia/gpu/gl4/gl4_shader.cc
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@@ -245,16 +245,32 @@ bool GL4Shader::PreparePixelShader(
}
has_prepared_ = true;
std::string source = GetHeader() +
"layout(origin_upper_left) in vec4 gl_FragCoord;\n"
"layout(location = 0) flat in uint draw_id;\n"
"layout(location = 1) in VertexData vtx;\n"
"layout(location = 0) out vec4 oC[4];\n"
"void processFragment(const in StateData state);\n"
"void main() {\n" +
" const StateData state = states[draw_id];\n"
" processFragment(state);\n"
"}\n";
std::string source =
GetHeader() +
"layout(origin_upper_left) in vec4 gl_FragCoord;\n"
"layout(location = 0) flat in uint draw_id;\n"
"layout(location = 1) in VertexData vtx;\n"
"layout(location = 0) out vec4 oC[4];\n"
"void processFragment(const in StateData state);\n"
"void applyAlphaTest(int alpha_func, float alpha_ref) {\n"
" switch (alpha_func) {\n"
" case 0: discard;\n"
" case 1: if (oC[0].a < alpha_ref) discard; break;\n"
" case 2: if (oC[0].a == alpha_ref) discard; break;\n"
" case 3: if (oC[0].a <= alpha_ref) discard; break;\n"
" case 4: if (oC[0].a > alpha_ref) discard; break;\n"
" case 5: if (oC[0].a != alpha_ref) discard; break;\n"
" case 6: if (oC[0].a >= alpha_ref) discard; break;\n"
" case 7: break;\n"
" };\n"
"}\n"
"void main() {\n" +
" const StateData state = states[draw_id];\n"
" processFragment(state);\n"
" if (state.alpha_test.x != 0.0) {\n"
" applyAlphaTest(int(state.alpha_test.y), state.alpha_test.z);\n"
" }\n"
"}\n";
std::string translated_source =
shader_translator_.TranslatePixelShader(this, program_cntl);