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Added PCF shadows
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850e61d1c9
commit
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1 changed files with 24 additions and 3 deletions
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@ -139,11 +139,10 @@ float R_DoomLightingEquation(float light)
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//
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//===========================================================================
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float shadowmapAttenuation(vec4 lightpos, float shadowIndex)
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float sampleShadowmap(vec2 lightpos, vec2 testpos, float v)
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{
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float u;
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float v = (abs(shadowIndex) + 0.5) / 1024.0;
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vec2 dir = (pixelpos.xz - lightpos.xz);
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vec2 dir = (testpos - lightpos);
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if (abs(dir.x) > abs(dir.y))
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{
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if (dir.x >= 0.0)
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@ -163,6 +162,28 @@ float shadowmapAttenuation(vec4 lightpos, float shadowIndex)
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return texture(ShadowMap, vec2(u, v)).x > dist2 ? 1.0 : 0.0;
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}
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//===========================================================================
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//
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// Check if light is in shadow using Percentage Closer Filtering (PCF)
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//
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//===========================================================================
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#define PCF_FILTER_STEP_COUNT 3
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#define PCF_COUNT (PCF_FILTER_STEP_COUNT * 2 + 1)
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float shadowmapAttenuation(vec4 lightpos, float shadowIndex)
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{
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float v = (abs(shadowIndex) + 0.5) / 1024.0;
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vec2 dir = (pixelpos.xz - lightpos.xz);
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vec2 normal = normalize(vec2(-dir.y, dir.x));
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float sum = 0.0;
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for (float x = -PCF_FILTER_STEP_COUNT; x <= PCF_FILTER_STEP_COUNT; x++)
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{
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sum += sampleShadowmap(lightpos.xz, pixelpos.xz + normal * x, v);
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}
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return sum / PCF_COUNT;
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}
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//===========================================================================
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//
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// Standard lambertian diffuse light calculation
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