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use shader for rgb555 color conversion

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This commit is contained in:
FunkyFr3sh 2023-09-06 22:46:43 +02:00
parent a059fabf89
commit d93a78b2a0
2 changed files with 26 additions and 3 deletions
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19
inc/openglshader.h
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@ -84,6 +84,25 @@ static char PASSTHROUGH_FRAG_SHADER[] =
"}\n";
static char RBG555_FRAG_SHADER[] =
"#version 130\n"
"out vec4 FragColor;\n"
"uniform sampler2D Texture;\n"
"in vec4 TEX0;\n"
"\n"
"void main()\n"
"{\n"
" vec4 texel = texture(Texture, TEX0.xy);\n"
" int bytes = int(texel.r * 255.0 + 0.5) | int(texel.g * 255.0 + 0.5) << 8;\n"
" vec4 color;\n"
" color.r = float((bytes >> 10) & 31) / 31.0;\n"
" color.g = float((bytes >> 5) & 31) / 31.0;\n"
" color.b = float(bytes & 31) / 31.0;\n"
" color.a = 1.0;\n"
" FragColor = color;\n"
"}\n";
/*
// The following code is licensed under the MIT license: https://gist.github.com/TheRealMJP/bc503b0b87b643d3505d41eab8b332ae
// Ported from code: https://gist.github.com/TheRealMJP/c83b8c0f46b63f3a88a5986f4fa982b1