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Playing more with viewport stuff.

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This commit is contained in:
Ben Vanik
2015-03-14 16:11:55 -07:00
parent d57306b473
commit 7192728fe0
7 changed files with 186 additions and 129 deletions
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53
src/xenia/gpu/gl4/gl4_shader.cc
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@@ -54,9 +54,6 @@ std::string GL4Shader::GetHeader() {
// This must match DrawBatcher::CommonHeader.
"struct StateData {\n"
" vec4 window_offset;\n"
" vec4 window_scissor;\n"
" vec4 viewport_offset;\n"
" vec4 viewport_scale;\n"
" vec4 vtx_fmt;\n"
" vec4 alpha_test;\n"
// TODO(benvanik): variable length.
@@ -185,40 +182,21 @@ bool GL4Shader::PrepareVertexShader(
}
std::string apply_transform =
"vec4 applyTransform(const in StateData state, vec4 Pclip) {\n"
" // Clip->NDC with perspective divide.\n"
" // We do this here because it's programmable on the 360.\n"
" if (state.vtx_fmt.w != 0.0) {\n"
" // w is not 1/W0. Common case.\n"
" Pclip.w = 1.0 / Pclip.w;\n"
"vec4 applyTransform(const in StateData state, vec4 pos) {\n"
" if (state.vtx_fmt.w == 0.0) {\n"
" // w is 1/W0, so fix it.\n"
" pos.w = 1.0 / pos.w;\n"
" }\n"
" vec3 Pndc = Pclip.xyz;\n"
" if (state.vtx_fmt.x == 0.0) {\n"
" // Need to multiply by 1/W0.\n"
" Pndc.xy *= Pclip.w;\n"
" if (state.vtx_fmt.x != 0.0) {\n"
" // Already multiplied by 1/W0, so pull it out.\n"
" pos.xy /= pos.w;\n"
" }\n"
" if (state.vtx_fmt.z == 0.0) {\n"
" // Need to multiply by 1/W0.\n"
" Pndc.z *= Pclip.w;\n"
" if (state.vtx_fmt.z != 0.0) {\n"
" // Already multiplied by 1/W0, so pull it out.\n"
" pos.z /= pos.w;\n"
" }\n"
" // Perform clipping, lest we get weird geometry.\n"
// TODO(benvanik): is this right? dxclip mode may change this?
" Pclip.w = 1.0;\n"
" if (Pndc.z < gl_DepthRange.near || Pndc.z > gl_DepthRange.far) {\n"
" // Clipped! w=0 will kill it in the hardware persp divide.\n"
" Pclip.w = 0.0;\n"
" }\n"
" vec3 Pwnd = Pndc.xyz * state.viewport_scale.xyz + \n"
" state.viewport_offset.xyz;\n"
" // 1px padding required for pixel offset issue.\n"
" Pwnd.xy += 1.0;\n"
" vec3 Pwnd2 = vec3(Pwnd.xy * state.window_offset.zw + \n"
" state.window_offset.xy, Pwnd.z);\n"
" Pwnd2.y = 2560.0 - Pwnd2.y;\n"
" vec3 fb_offset = vec3(2560.0 / 2.0, 2560.0 / 2.0, 0.0);\n"
" vec3 fb_scale = vec3(2560.0 / 2.0, 2560.0 / 2.0, 1.0);\n"
" vec3 Pndc2 = (Pwnd2.xyz - fb_offset.xyz) / fb_scale.xyz;\n"
" return vec4(Pndc2.xy, Pndc2.z, Pclip.w);\n"
" pos.xy *= state.window_offset.zw;\n"
" return pos;\n"
"}\n";
std::string source =
GetHeader() + apply_transform +
@@ -275,13 +253,6 @@ bool GL4Shader::PreparePixelShader(
"void processFragment(const in StateData state);\n"
"void main() {\n" +
" const StateData state = states[draw_id];\n"
" // Custom scissoring. Doing it here avoids the need for glScissor.\n"
" if (gl_FragCoord.x < state.window_scissor.x ||\n"
" gl_FragCoord.x > state.window_scissor.z ||\n"
" gl_FragCoord.y < state.window_scissor.y ||\n"
" gl_FragCoord.y > state.window_scissor.w) {\n"
" discard;\n"
" }\n"
" processFragment(state);\n"
"}\n";