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Use linear equation for LOD calculation,

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as proposed by standard-two-simplex in #2203
This commit is contained in:
Sergey Lipskiy 2020-04-09 15:06:59 +07:00
parent a73da69e10
commit d8f031294a
1 changed files with 3 additions and 3 deletions
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6
src/Graphics/OpenGLContext/GLSL/glsl_CombinerProgramBuilder.cpp
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@ -1851,9 +1851,9 @@ public:
" readtex1 = texture2DLodEXT(uTex1, texCoord1, 0.0); \n"
" \n"
" mediump float fMaxTile = float(uMaxTile); \n"
" mediump vec2 dx = abs(dFdx(vLodTexCoord)); \n"
" dx *= uScreenScale; \n"
" mediump float lod = max(dx.x, dx.y); \n"
" mediump vec2 dx = abs(dFdx(vLodTexCoord)) * uScreenScale; \n"
" mediump vec2 dy = abs(dFdy(vLodTexCoord)) * uScreenScale; \n"
" mediump float lod = max(dx.x + dx.y, dy.x + dy.y); \n" /*LINEAR*/
" bool magnify = lod < 1.0; \n"
" mediump float lod_tile = magnify ? 0.0 : floor(log2(floor(lod))); \n"
" bool distant = lod > 128.0 || lod_tile >= fMaxTile; \n"