Multisampling in gles canvas shader
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28e2a3648e
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@ -71,19 +71,19 @@ int main()
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{
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if(event.key.code == MP_KEY_LEFT)
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{
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dx-=1.1;
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dx-=5.1;
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}
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else if(event.key.code == MP_KEY_RIGHT)
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{
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dx+=1.1;
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dx+=5.1;
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}
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else if(event.key.code == MP_KEY_UP)
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{
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dy+=1.1;
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dy+=5.1;
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}
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else if(event.key.code == MP_KEY_DOWN)
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{
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dy-=1.1;
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dy-=5.1;
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}
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}
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} break;
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@ -51,22 +51,37 @@ const char* gles_canvas_fragment =
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"\n"
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"void main()\n"
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"{\n"
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" float subPixelFactor = 16.;\n"
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" const float subPixelFactor = 16.;\n"
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" const int sampleCount = 8;\n"
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"\n"
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" vec4 pixelColor = clearColor;\n"
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" vec4 currentColor = clearColor;\n"
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" ivec2 centerPoint = ivec2(round(gl_FragCoord.xy * subPixelFactor));\n"
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" ivec2 samplePoints[sampleCount] = ivec2[sampleCount](centerPoint + ivec2(1, 3),\n"
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" centerPoint + ivec2(-1, -3),\n"
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" centerPoint + ivec2(5, -1),\n"
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" centerPoint + ivec2(-3, 5),\n"
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" centerPoint + ivec2(-5, -5),\n"
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" centerPoint + ivec2(-7, 1),\n"
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" centerPoint + ivec2(3, -7),\n"
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" centerPoint + ivec2(7, 7));\n"
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"\n"
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" ivec2 samplePoint = ivec2(gl_FragCoord.xy * subPixelFactor + vec2(0.5, 0.5));\n"
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" vec4 sampleColor[sampleCount];\n"
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" vec4 currentColor[sampleCount];\n"
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" int currentZIndex[sampleCount];\n"
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" int flipCount[sampleCount];\n"
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"\n"
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" int currentZIndex = -1;\n"
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" int flipCount = 0;\n"
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"\n"
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"\n"
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" for(int i=0; i<indexCount; i+=3)\n"
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" for(int i=0; i<sampleCount; i++)\n"
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" {\n"
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" uint i0 = indexBuffer.elements[i];\n"
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" uint i1 = indexBuffer.elements[i+1];\n"
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" uint i2 = indexBuffer.elements[i+2];\n"
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" currentZIndex[i] = -1;\n"
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" flipCount[i] = 0;\n"
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" sampleColor[i] = clearColor;\n"
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" currentColor[i] = clearColor;\n"
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" }\n"
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"\n"
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" for(int triangleIndex=0; triangleIndex<indexCount; triangleIndex+=3)\n"
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" {\n"
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" uint i0 = indexBuffer.elements[triangleIndex];\n"
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" uint i1 = indexBuffer.elements[triangleIndex+1];\n"
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" uint i2 = indexBuffer.elements[triangleIndex+2];\n"
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"\n"
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" ivec2 p0 = ivec2(vertexBuffer.elements[i0].pos * subPixelFactor + vec2(0.5, 0.5));\n"
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" ivec2 p1 = ivec2(vertexBuffer.elements[i1].pos * subPixelFactor + vec2(0.5, 0.5));\n"
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@ -96,40 +111,49 @@ const char* gles_canvas_fragment =
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" int bias1 = is_top_left(p2, p0) ? 0 : -1;\n"
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" int bias2 = is_top_left(p0, p1) ? 0 : -1;\n"
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"\n"
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" int w0 = orient2d(p1, p2, samplePoint);\n"
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" int w1 = orient2d(p2, p0, samplePoint);\n"
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" int w2 = orient2d(p0, p1, samplePoint);\n"
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"\n"
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" if((w0+bias0) >= 0 && (w1+bias1) >= 0 && (w2+bias2) >= 0)\n"
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" for(int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)\n"
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" {\n"
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" vec4 cubic = (cubic0*float(w0) + cubic1*float(w1) + cubic2*float(w2))/(float(w0)+float(w1)+float(w2));\n"
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" ivec2 samplePoint = samplePoints[sampleIndex];\n"
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"\n"
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" float eps = 0.0001;\n"
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" if(cubic.w*(cubic.x*cubic.x*cubic.x - cubic.y*cubic.z) <= eps)\n"
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" int w0 = orient2d(p1, p2, samplePoint);\n"
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" int w1 = orient2d(p2, p0, samplePoint);\n"
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" int w2 = orient2d(p0, p1, samplePoint);\n"
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"\n"
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" if((w0+bias0) >= 0 && (w1+bias1) >= 0 && (w2+bias2) >= 0)\n"
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" {\n"
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" if(zIndex == currentZIndex)\n"
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" vec4 cubic = (cubic0*float(w0) + cubic1*float(w1) + cubic2*float(w2))/(float(w0)+float(w1)+float(w2));\n"
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"\n"
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" float eps = 0.0001;\n"
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" if(cubic.w*(cubic.x*cubic.x*cubic.x - cubic.y*cubic.z) <= eps)\n"
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" {\n"
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" flipCount++;\n"
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" }\n"
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" else\n"
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" {\n"
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" if((flipCount & 0x01) != 0)\n"
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" if(zIndex == currentZIndex[sampleIndex])\n"
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" {\n"
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" pixelColor = currentColor;\n"
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" flipCount[sampleIndex]++;\n"
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" }\n"
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" else\n"
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" {\n"
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" if((flipCount[sampleIndex] & 0x01) != 0)\n"
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" {\n"
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" sampleColor[sampleIndex] = currentColor[sampleIndex];\n"
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" }\n"
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" currentColor[sampleIndex] = sampleColor[sampleIndex]*(1.-color.a) + color.a*color;\n"
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" currentZIndex[sampleIndex] = zIndex;\n"
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" flipCount[sampleIndex] = 1;\n"
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" }\n"
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" currentColor = pixelColor*(1.-color.a) + color.a*color;\n"
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" currentZIndex = zIndex;\n"
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" flipCount = 1;\n"
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" }\n"
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" }\n"
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" }\n"
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" }\n"
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" if((flipCount & 0x01) != 0)\n"
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" vec4 pixelColor = vec4(0);\n"
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" for(int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)\n"
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" {\n"
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" pixelColor = currentColor;\n"
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" }\n"
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"\n"
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" fragColor = pixelColor;\n"
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" if((flipCount[sampleIndex] & 0x01) != 0)\n"
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" {\n"
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" sampleColor[sampleIndex] = currentColor[sampleIndex];\n"
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" }\n"
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" pixelColor += sampleColor[sampleIndex];\n"
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" }\n"
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" fragColor = pixelColor/float(sampleCount);\n"
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"}\n";
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//NOTE: string imported from src\gles_canvas_shaders\gles_canvas_vertex.glsl
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@ -38,22 +38,37 @@ int orient2d(ivec2 a, ivec2 b, ivec2 p)
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void main()
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{
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float subPixelFactor = 16.;
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const float subPixelFactor = 16.;
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const int sampleCount = 8;
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vec4 pixelColor = clearColor;
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vec4 currentColor = clearColor;
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ivec2 centerPoint = ivec2(round(gl_FragCoord.xy * subPixelFactor));
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ivec2 samplePoints[sampleCount] = ivec2[sampleCount](centerPoint + ivec2(1, 3),
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centerPoint + ivec2(-1, -3),
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centerPoint + ivec2(5, -1),
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centerPoint + ivec2(-3, 5),
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centerPoint + ivec2(-5, -5),
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centerPoint + ivec2(-7, 1),
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centerPoint + ivec2(3, -7),
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centerPoint + ivec2(7, 7));
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ivec2 samplePoint = ivec2(gl_FragCoord.xy * subPixelFactor + vec2(0.5, 0.5));
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vec4 sampleColor[sampleCount];
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vec4 currentColor[sampleCount];
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int currentZIndex[sampleCount];
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int flipCount[sampleCount];
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int currentZIndex = -1;
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int flipCount = 0;
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for(int i=0; i<indexCount; i+=3)
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for(int i=0; i<sampleCount; i++)
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{
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uint i0 = indexBuffer.elements[i];
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uint i1 = indexBuffer.elements[i+1];
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uint i2 = indexBuffer.elements[i+2];
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currentZIndex[i] = -1;
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flipCount[i] = 0;
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sampleColor[i] = clearColor;
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currentColor[i] = clearColor;
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}
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for(int triangleIndex=0; triangleIndex<indexCount; triangleIndex+=3)
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{
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uint i0 = indexBuffer.elements[triangleIndex];
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uint i1 = indexBuffer.elements[triangleIndex+1];
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uint i2 = indexBuffer.elements[triangleIndex+2];
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ivec2 p0 = ivec2(vertexBuffer.elements[i0].pos * subPixelFactor + vec2(0.5, 0.5));
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ivec2 p1 = ivec2(vertexBuffer.elements[i1].pos * subPixelFactor + vec2(0.5, 0.5));
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@ -83,38 +98,47 @@ void main()
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int bias1 = is_top_left(p2, p0) ? 0 : -1;
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int bias2 = is_top_left(p0, p1) ? 0 : -1;
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int w0 = orient2d(p1, p2, samplePoint);
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int w1 = orient2d(p2, p0, samplePoint);
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int w2 = orient2d(p0, p1, samplePoint);
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if((w0+bias0) >= 0 && (w1+bias1) >= 0 && (w2+bias2) >= 0)
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for(int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)
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{
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vec4 cubic = (cubic0*float(w0) + cubic1*float(w1) + cubic2*float(w2))/(float(w0)+float(w1)+float(w2));
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ivec2 samplePoint = samplePoints[sampleIndex];
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float eps = 0.0001;
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if(cubic.w*(cubic.x*cubic.x*cubic.x - cubic.y*cubic.z) <= eps)
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int w0 = orient2d(p1, p2, samplePoint);
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int w1 = orient2d(p2, p0, samplePoint);
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int w2 = orient2d(p0, p1, samplePoint);
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if((w0+bias0) >= 0 && (w1+bias1) >= 0 && (w2+bias2) >= 0)
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{
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if(zIndex == currentZIndex)
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vec4 cubic = (cubic0*float(w0) + cubic1*float(w1) + cubic2*float(w2))/(float(w0)+float(w1)+float(w2));
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float eps = 0.0001;
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if(cubic.w*(cubic.x*cubic.x*cubic.x - cubic.y*cubic.z) <= eps)
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{
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flipCount++;
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}
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else
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{
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if((flipCount & 0x01) != 0)
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if(zIndex == currentZIndex[sampleIndex])
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{
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pixelColor = currentColor;
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flipCount[sampleIndex]++;
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}
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else
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{
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if((flipCount[sampleIndex] & 0x01) != 0)
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{
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sampleColor[sampleIndex] = currentColor[sampleIndex];
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}
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currentColor[sampleIndex] = sampleColor[sampleIndex]*(1.-color.a) + color.a*color;
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currentZIndex[sampleIndex] = zIndex;
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flipCount[sampleIndex] = 1;
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}
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currentColor = pixelColor*(1.-color.a) + color.a*color;
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currentZIndex = zIndex;
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flipCount = 1;
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}
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}
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}
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}
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if((flipCount & 0x01) != 0)
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vec4 pixelColor = vec4(0);
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for(int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)
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{
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pixelColor = currentColor;
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}
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fragColor = pixelColor;
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if((flipCount[sampleIndex] & 0x01) != 0)
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{
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sampleColor[sampleIndex] = currentColor[sampleIndex];
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}
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pixelColor += sampleColor[sampleIndex];
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}
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fragColor = pixelColor/float(sampleCount);
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}
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20
todo.txt
20
todo.txt
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@ -22,17 +22,27 @@
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-> convert verts pos to fixed point
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-> do orient2d in fixed point
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[!] Check precision/possible overflow when using barycentric coords
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[!] Avoid first useless (degenerate) triangle on every path
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[x] Set backround clear color
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[ ] Multi-sampling
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[ ] Assess perf
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[x] Multi-sampling
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[!] Avoid first useless (degenerate) triangle on every path
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[ ] image rendering
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[ ] Re-think image API first??
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[ ] gles image atlas logic
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[ ] textured rendering in shader
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[ ] Image rendering test app
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[ ] Text rendering test app
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[?] Little test drawing app?
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[>] Assess perf
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[ ] Tiling
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[ ] Precomputing triangle edges/biases?
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[ ] Little test drawing app
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[ ] Implement surfaces with child windows on win32
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[/] Maybe implement compositing directly in d3d and opengl compat extension...
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[ ] Cleanup routines
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Windows port
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------------
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