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59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
#if __VERSION__ >= 300
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#include "shaders/uniformShaderConstants.h"
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vec4 texture2D_AA(in sampler2D tex, in highp vec2 uv)
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{
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// Texture antialiasing
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//
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// The texture coordinates are modified so that the bilinear filter will be one pixel wide instead of one texel wide.
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// Get the UV deltas
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highp vec2 dUVdx = dFdx(uv) * TEXTURE_DIMENSIONS.xy;
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highp vec2 dUVdy = dFdy(uv) * TEXTURE_DIMENSIONS.xy;
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highp vec2 dU = vec2(dUVdx.x, dUVdy.x);
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highp vec2 dV = vec2(dUVdx.y, dUVdy.y);
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highp float duUV = sqrt(dot(dU, dU));
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highp float dvUV = sqrt(dot(dV, dV));
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// Determine mip map LOD
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highp float d = max(dot(dUVdx, dUVdx), dot(dUVdy, dUVdy));
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highp float mipLevel = .5 * log2(d);
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mipLevel = mipLevel + .5; // Mip bias to reduce aliasing
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mipLevel = clamp(mipLevel, 0.0, TEXTURE_DIMENSIONS.z);
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highp vec2 uvModified;
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if( mipLevel >= 1.0)
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{
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uvModified = uv;
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}
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else
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{
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// First scale the uv so that each texel has a uv range of [0,1]
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highp vec2 texelUV = fract(uv * TEXTURE_DIMENSIONS.xy);
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// Initially set uvModified to the floor of the texel position
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uvModified = (uv * TEXTURE_DIMENSIONS.xy) - texelUV;
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// Modify the texelUV to push the uvs toward the edges.
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// | | | |
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// | _/ | | / |
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// Change | U _/ | to | U ___/ |
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// | _/ | | / |
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// | / | | / |
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// | X | | X |
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highp float scalerU = 1.0 / (duUV);
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highp float scalerV = 1.0 / (dvUV);
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highp vec2 scaler = max(vec2(scalerU, scalerV), 1.0);
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texelUV = clamp(texelUV * scaler, 0.0, .5) + clamp(texelUV*scaler - (scaler - .5), 0.0, .5);
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uvModified += texelUV;
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uvModified /= TEXTURE_DIMENSIONS.xy;
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}
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vec4 diffuse = texture2D(tex, uvModified);
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return diffuse;
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}
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#endif //__VERSION__ >= 300
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