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VideoBackends: Implement depth copy shaders with integer math.

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Jules Blok
2015-05-04 23:28:30 +02:00
parent f9dc8a39c0
commit 7a1252f7e5
2 changed files with 33 additions and 53 deletions
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28
Source/Core/VideoBackends/OGL/TextureCache.cpp
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@ -294,27 +294,19 @@ void TextureCache::CompileShaders()
"\n"
"void main(){\n"
" vec4 texcol = texture(samp9, vec3(f_uv0.xy, %s));\n"
" int depth = int(round(texcol.x * float(0xFFFFFF)));\n"
// 255.99998474121 = 16777215/16777216*256
" float workspace = texcol.x * 255.99998474121;\n"
// Convert to Z24 format
" ivec4 workspace;\n"
" workspace.r = (depth >> 16) & 255;\n"
" workspace.g = (depth >> 8) & 255;\n"
" workspace.b = depth & 255;\n"
" texcol.x = floor(workspace);\n" // x component
// Convert to Z4 format
" workspace.a = (depth >> 16) & 0xF0;\n"
" workspace = workspace - texcol.x;\n" // subtract x component out
" workspace = workspace * 256.0;\n" // shift left 8 bits
" texcol.y = floor(workspace);\n" // y component
" workspace = workspace - texcol.y;\n" // subtract y component out
" workspace = workspace * 256.0;\n" // shift left 8 bits
" texcol.z = floor(workspace);\n" // z component
" texcol.w = texcol.x;\n" // duplicate x into w
" texcol = texcol / 255.0;\n" // normalize components to [0.0..1.0]
" texcol.w = texcol.w * 15.0;\n"
" texcol.w = floor(texcol.w);\n"
" texcol.w = texcol.w / 15.0;\n" // w component
// Normalize components to [0.0..1.0]
" texcol = vec4(workspace) / 255.0;\n"
" ocol0 = texcol * mat4(colmat[0], colmat[1], colmat[2], colmat[3]) + colmat[4];\n"
"}\n";