1 | #version 100 |
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2 | precision mediump int; |
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3 | precision mediump float; |
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4 | |
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5 | uniform sampler2D inRTT; |
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6 | uniform sampler2D inBloom; |
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7 | uniform sampler2D inLum; |
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8 | |
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9 | varying vec2 uv; |
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10 | |
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11 | const float MIDDLE_GREY = 0.72; |
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12 | const float FUDGE = 0.001; |
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13 | const float L_WHITE = 1.5; |
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14 | |
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15 | /** Tone mapping function |
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16 | @note Only affects rgb, not a |
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17 | @param inColour The HDR colour |
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18 | @param lum The scene lumninence |
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19 | @returns Tone mapped colour |
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20 | */ |
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21 | vec4 toneMap(in vec4 inColour, in float lum) |
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22 | { |
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23 | // From Reinhard et al |
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24 | // "Photographic Tone Reproduction for Digital Images" |
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25 | |
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26 | // Initial luminence scaling (equation 2) |
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27 | inColour.rgb *= MIDDLE_GREY / (FUDGE + lum); |
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28 | |
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29 | // Control white out (equation 4 nom) |
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30 | inColour.rgb *= (1.0 + inColour.rgb / L_WHITE); |
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31 | |
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32 | // Final mapping (equation 4 denom) |
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33 | inColour.rgb /= (1.0 + inColour.rgb); |
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34 | |
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35 | return inColour; |
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36 | } |
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37 | |
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38 | void main(void) |
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39 | { |
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40 | // Get main scene colour |
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41 | vec4 sceneCol = texture2D(inRTT, uv); |
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42 | |
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43 | // Get luminence value |
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44 | vec4 lum = texture2D(inLum, vec2(0.5, 0.5)); |
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45 | |
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46 | // tone map this |
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47 | vec4 toneMappedSceneCol = toneMap(sceneCol, lum.r); |
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48 | |
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49 | // Get bloom colour |
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50 | vec4 bloom = texture2D(inBloom, uv); |
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51 | |
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52 | // Add scene & bloom |
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53 | gl_FragColor = vec4(toneMappedSceneCol.rgb + bloom.rgb, 1.0); |
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54 | } |
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