[Bf-blender-cvs] [28fa79219df] blender2.8: GPUMaterial: Texture Node: Add support for Cubic filtering
Clément Foucault
noreply at git.blender.org
Fri Jul 20 19:17:31 CEST 2018
Commit: 28fa79219df8d103ccc4af9433c581be50ae2bc7
Author: Clément Foucault
Date: Fri Jul 20 19:16:33 2018 +0200
Branches: blender2.8
https://developer.blender.org/rB28fa79219df8d103ccc4af9433c581be50ae2bc7
GPUMaterial: Texture Node: Add support for Cubic filtering
Like in cycles it's a bit more slower than linear but it's smoother.
Works for all projection type.
===================================================================
M source/blender/gpu/shaders/gpu_shader_material.glsl
===================================================================
diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index 7f2475f0aab..961837f6b16 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -1813,7 +1813,61 @@ void node_tex_image_nearest(vec3 co, sampler2D ima, out vec4 color, out float al
void node_tex_image_cubic(vec3 co, sampler2D ima, out vec4 color, out float alpha)
{
- node_tex_image_linear(co, ima, color, alpha);
+ vec2 tex_size = vec2(textureSize(ima, 0).xy);
+
+ co.xy *= tex_size;
+ /* texel center */
+ vec2 tc = floor(co.xy - 0.5) + 0.5;
+ vec2 f = co.xy - tc;
+ vec2 f2 = f * f;
+ vec2 f3 = f2 * f;
+ /* Bspline coefs (optimized) */
+ vec2 w3 = f3 / 6.0;
+ vec2 w0 = -w3 + f2 * 0.5 - f * 0.5 + 1.0 / 6.0;
+ vec2 w1 = f3 * 0.5 - f2 * 1.0 + 2.0 / 3.0;
+ vec2 w2 = 1.0 - w0 - w1 - w3;
+
+#if 1 /* Optimized version using 4 filtered tap. */
+ vec2 s0 = w0 + w1;
+ vec2 s1 = w2 + w3;
+
+ vec2 f0 = w1 / (w0 + w1);
+ vec2 f1 = w3 / (w2 + w3);
+
+ vec4 final_co;
+ final_co.xy = tc - 1.0 + f0;
+ final_co.zw = tc + 1.0 + f1;
+
+ final_co /= tex_size.xyxy;
+
+ color = texture(ima, final_co.xy) * s0.x * s0.y;
+ color += texture(ima, final_co.zy) * s1.x * s0.y;
+ color += texture(ima, final_co.xw) * s0.x * s1.y;
+ color += texture(ima, final_co.zw) * s1.x * s1.y;
+
+#else /* Reference bruteforce 16 tap. */
+ color = texelFetch(ima, ivec2(tc + vec2(-1.0, -1.0)), 0) * w0.x * w0.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 0.0, -1.0)), 0) * w1.x * w0.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 1.0, -1.0)), 0) * w2.x * w0.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 2.0, -1.0)), 0) * w3.x * w0.y;
+
+ color += texelFetch(ima, ivec2(tc + vec2(-1.0, 0.0)), 0) * w0.x * w1.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 0.0, 0.0)), 0) * w1.x * w1.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 1.0, 0.0)), 0) * w2.x * w1.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 2.0, 0.0)), 0) * w3.x * w1.y;
+
+ color += texelFetch(ima, ivec2(tc + vec2(-1.0, 1.0)), 0) * w0.x * w2.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 0.0, 1.0)), 0) * w1.x * w2.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 1.0, 1.0)), 0) * w2.x * w2.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 2.0, 1.0)), 0) * w3.x * w2.y;
+
+ color += texelFetch(ima, ivec2(tc + vec2(-1.0, 2.0)), 0) * w0.x * w3.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 0.0, 2.0)), 0) * w1.x * w3.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 1.0, 2.0)), 0) * w2.x * w3.y;
+ color += texelFetch(ima, ivec2(tc + vec2( 2.0, 2.0)), 0) * w3.x * w3.y;
+#endif
+
+ alpha = color.a;
}
void node_tex_image_smart(vec3 co, sampler2D ima, out vec4 color, out float alpha)
@@ -1886,7 +1940,25 @@ void tex_box_sample_cubic(vec3 texco,
out vec4 color2,
out vec4 color3)
{
- tex_box_sample_linear(texco, N, ima, color1, color2, color3);
+ float alpha;
+ /* X projection */
+ vec2 uv = texco.yz;
+ if (N.x < 0.0) {
+ uv.x = 1.0 - uv.x;
+ }
+ node_tex_image_cubic(uv.xyy, ima, color1, alpha);
+ /* Y projection */
+ uv = texco.xz;
+ if (N.y > 0.0) {
+ uv.x = 1.0 - uv.x;
+ }
+ node_tex_image_cubic(uv.xyy, ima, color2, alpha);
+ /* Z projection */
+ uv = texco.yx;
+ if (N.z > 0.0) {
+ uv.x = 1.0 - uv.x;
+ }
+ node_tex_image_cubic(uv.xyy, ima, color3, alpha);
}
void tex_box_sample_smart(vec3 texco,
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