Quote:Original post by Styves
source:
// Put them together and multiply them by the offset scale for the final result.
float2 Normal = float2( vec1, vec2) * vPixelViewport;
// Color
Normal.xy *= vPixelViewport * 2; // Increase pixel size to get more blur
Normal.xy = clamp(Normal,-float2(1.0,1.0)*0.4,float2(1.0,1.0)*0.4); //Prevent over-blurring in high-contrast areas! -venzonNormal.xy *= vPixelViewport * 2; // Increase pixel size to get more blurfloat4 Scene0 = tex2D( ColorTextureSampler, i_TexCoord.xy );float4 Scene1 = tex2D( ColorTextureSampler, i_TexCoord.xy + Normal.xy );float4 Scene2 = tex2D( ColorTextureSampler, i_TexCoord.xy - Normal.xy );float4 Scene3 = tex2D( ColorTextureSampler, i_TexCoord.xy + float2(Normal.x, -Normal.y) );float4 Scene4 = tex2D( ColorTextureSampler, i_TexCoord.xy - float2(Normal.x, -Normal.y) );float2 vPixelViewport = float2( 1.0f / VIEWPORT_WIDTH, 1.0f / VIEWPORT_HEIGHT );const float fScale = 3;// Offset coordinatesfloat2 upOffset = float2( 0, vPixelViewport.y ) * fScale;float2 rightOffset = float2( vPixelViewport.x, 0 ) * fScale;float topHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy + upOffset).rgb );float bottomHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy - upOffset).rgb );float rightHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy + rightOffset).rgb );float leftHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy - rightOffset).rgb );float leftTopHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy - rightOffset + upOffset).rgb );float leftBottomHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy - rightOffset - upOffset).rgb );float rightBottomHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy + rightOffset + upOffset).rgb );float rightTopHeight = GetColorLuminance( tex2D( ColorTextureSampler, i_TexCoord.xy + rightOffset - upOffset).rgb ); // Normal map creationfloat sum0 = rightTopHeight+ topHeight + rightBottomHeight;float sum1 = leftTopHeight + bottomHeight + leftBottomHeight;float sum2 = leftTopHeight + leftHeight + TopRight;float sum3 = leftBottomHeight + rightHeight + rightBottomHeight;float vec1 = (sum1 - sum0);float vec2 = (sum2 - sum3);// Put them together and scale.float2 Normal = float2( vec1, vec2) * vPixelViewport * fScale;// Colorfloat4 Scene0 = tex2D( ColorTextureSampler, i_TexCoord.xy );float4 Scene1 = tex2D( ColorTextureSampler, i_TexCoord.xy + Normal.xy );float4 Scene2 = tex2D( ColorTextureSampler, i_TexCoord.xy - Normal.xy );float4 Scene3 = tex2D( ColorTextureSampler, i_TexCoord.xy + float2(Normal.x, -Normal.y) * 0.5 );float4 Scene4 = tex2D( ColorTextureSampler, i_TexCoord.xy - float2(Normal.x, -Normal.y) * 0.5 );// Final coloro_Color = (Scene0 + Scene1 + Scene2 + Scene3 + Scene4) * 0.2;float lumRGB(vec3 v){ return dot(v, vec3(0.212, 0.716, 0.072)); } void main(){ vec2 UV = gl_FragCoord.xy * inverse_buffer_size; float w = 1.75; float t = lumRGB(texture2D(source, UV + vec2(0.0, -1.0) * w * inverse_buffer_size).xyz), l = lumRGB(texture2D(source, UV + vec2(-1.0, 0.0) * w * inverse_buffer_size).xyz), r = lumRGB(texture2D(source, UV + vec2(1.0, 0.0) * w * inverse_buffer_size).xyz), b = lumRGB(texture2D(source, UV + vec2(0.0, 1.0) * w * inverse_buffer_size).xyz); vec2 n = vec2(-(t - b), r - l); float nl = length(n); if (nl < (1.0 / 16.0)) gl_FragColor = texture2D(source, UV); else { n *= inverse_buffer_size / nl; vec4 o = texture2D(source, UV), t0 = texture2D(source, UV + n * 0.5) * 0.9, t1 = texture2D(source, UV - n * 0.5) * 0.9, t2 = texture2D(source, UV + n) * 0.75, t3 = texture2D(source, UV - n) * 0.75; gl_FragColor = (o + t0 + t1 + t2 + t3) / 4.3; }}
We had great success with this approach. Our implementation is somewhat different than that described above.
We take four strategically-placed samples to establish edge direction, leveraging bilinear filtering to get the most out of each sample. Then we do a four-tap blur (three also works well) with a strong directional bias along the edge. The size of the blur kernel is in proportion to the detected edge contrast, but the sample weighting is constant. This works astonishingly well and is a fraction of a millisecond compared to 3+ ms for MLAA.
Can you describe better the process you are using? Are you using both normal and depth???
