a53163660f
Don't globally set float precision to mediump, only fragment shaders need that and defining it for vertex shaders causes tilemap cracks. Also manually define low precision for variables that hold color / alpha values.
23 lines
598 B
GLSL
23 lines
598 B
GLSL
/* Fragment shader dealing with transitions */
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uniform sampler2D currentScene;
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uniform sampler2D frozenScene;
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uniform sampler2D transMap;
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/* Normalized */
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uniform float prog;
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/* Vague [0, 512] normalized */
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uniform float vague;
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varying vec2 v_texCoord;
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void main()
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{
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float transV = texture2D(transMap, v_texCoord).r;
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float cTransV = clamp(transV, prog, prog+vague);
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lowp float alpha = (cTransV - prog) / vague;
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vec4 newFrag = texture2D(currentScene, v_texCoord);
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vec4 oldFrag = texture2D(frozenScene, v_texCoord);
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gl_FragColor = mix(newFrag, oldFrag, alpha);
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}
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