mirror of https://github.com/minetest/minetest.git
101 lines
2.0 KiB
GLSL
101 lines
2.0 KiB
GLSL
#define rendered texture0
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#define bloom texture1
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uniform sampler2D rendered;
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uniform sampler2D bloom;
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uniform mediump float exposureFactor = 2.5;
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uniform lowp float bloomIntensity = 1.0;
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#ifdef GL_ES
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varying mediump vec2 varTexCoord;
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#else
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centroid varying vec2 varTexCoord;
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#endif
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#if ENABLE_BLOOM
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vec4 applyBloom(vec4 color, vec2 uv)
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{
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float bias = bloomIntensity;
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vec4 bloom = texture2D(bloom, uv);
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#if ENABLE_BLOOM_DEBUG
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if (uv.x > 0.5 && uv.y < 0.5)
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return vec4(bloom.rgb, color.a);
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if (uv.x < 0.5)
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return color;
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#endif
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color.rgb = mix(color.rgb, bloom.rgb, bias);
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return color;
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}
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#endif
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#if ENABLE_TONE_MAPPING
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/* Hable's UC2 Tone mapping parameters
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A = 0.22;
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B = 0.30;
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C = 0.10;
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D = 0.20;
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E = 0.01;
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F = 0.30;
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W = 11.2;
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equation used: ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
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*/
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vec3 uncharted2Tonemap(vec3 x)
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{
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return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
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}
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vec4 applyToneMapping(vec4 color)
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{
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const float exposureBias = 2.0;
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color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
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// Precalculated white_scale from
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//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
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vec3 whiteScale = vec3(1.036015346);
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color.rgb *= whiteScale;
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return color;
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}
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#endif
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void main(void)
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{
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vec2 uv = varTexCoord.st;
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vec4 color = texture2D(rendered, uv).rgba;
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// translate to linear colorspace (approximate)
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color.rgb = pow(color.rgb, vec3(2.2));
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#if ENABLE_BLOOM_DEBUG
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if (uv.x > 0.5 || uv.y > 0.5)
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#endif
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{
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color.rgb *= exposureFactor;
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}
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#if ENABLE_BLOOM
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color = applyBloom(color, uv);
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#endif
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#if ENABLE_BLOOM_DEBUG
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if (uv.x > 0.5 || uv.y > 0.5)
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#endif
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{
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#if ENABLE_TONE_MAPPING
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color = applyToneMapping(color);
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#else
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color.rgb /= 2.5; // default exposure factor, see also RenderingEngine::DEFAULT_EXPOSURE_FACTOR;
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#endif
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}
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color.rgb = clamp(color.rgb, vec3(0.), vec3(1.));
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// return to sRGB colorspace (approximate)
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color.rgb = pow(color.rgb, vec3(1.0 / 2.2));
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gl_FragColor = vec4(color.rgb, 1.0); // force full alpha to avoid holes in the image.
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}
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