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Use cubic texture coordinate generation for the dual contour surfaces.

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This commit is contained in:
Andrzej Kapolka 2014-09-23 13:28:00 -07:00
parent 39e52babb1
commit 16cfaa6ea5
2 changed files with 26 additions and 9 deletions
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15
interface/resources/shaders/metavoxel_voxel_splat.frag
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@ -17,13 +17,20 @@ const int SPLAT_COUNT = 4;
// the splat textures
uniform sampler2D diffuseMaps[SPLAT_COUNT];
// the model space normal
varying vec3 normal;
// alpha values for the four splat textures
varying vec4 alphaValues;
void main(void) {
// determine the cube face to use for texture coordinate generation
vec3 absNormal = abs(normal);
vec2 parameters = step(absNormal.yy, absNormal.xz) * step(absNormal.zx, absNormal.xz);
// blend the splat textures
gl_FragColor = (texture2D(diffuseMaps[0], gl_TexCoord[0].st) * alphaValues.x +
texture2D(diffuseMaps[1], gl_TexCoord[1].st) * alphaValues.y +
texture2D(diffuseMaps[2], gl_TexCoord[2].st) * alphaValues.z +
texture2D(diffuseMaps[3], gl_TexCoord[3].st) * alphaValues.w);
gl_FragColor = (texture2D(diffuseMaps[0], mix(gl_TexCoord[0].xw, gl_TexCoord[0].zy, parameters)) * alphaValues.x +
texture2D(diffuseMaps[1], mix(gl_TexCoord[1].xw, gl_TexCoord[1].zy, parameters)) * alphaValues.y +
texture2D(diffuseMaps[2], mix(gl_TexCoord[2].xw, gl_TexCoord[2].zy, parameters)) * alphaValues.z +
texture2D(diffuseMaps[3], mix(gl_TexCoord[3].xw, gl_TexCoord[3].zy, parameters)) * alphaValues.w);
}

20
interface/resources/shaders/metavoxel_voxel_splat.vert
View file

@ -29,6 +29,9 @@ attribute vec4 materials;
// the weights of each material
attribute vec4 materialWeights;
// the model space normal
varying vec3 normal;
// alpha values for the four splat textures
varying vec4 alphaValues;
@ -36,12 +39,19 @@ void main(void) {
// use the fixed-function position
gl_Position = ftransform();
// pass along the normal
normal = gl_Normal;
// pass along the scaled/offset texture coordinates
vec4 textureSpacePosition = vec4(gl_Vertex.xz, 0.0, 1.0);
gl_TexCoord[0] = textureSpacePosition * vec4(splatTextureScalesS[0], splatTextureScalesT[0], 0.0, 1.0);
gl_TexCoord[1] = textureSpacePosition * vec4(splatTextureScalesS[1], splatTextureScalesT[1], 0.0, 1.0);
gl_TexCoord[2] = textureSpacePosition * vec4(splatTextureScalesS[2], splatTextureScalesT[2], 0.0, 1.0);
gl_TexCoord[3] = textureSpacePosition * vec4(splatTextureScalesS[3], splatTextureScalesT[3], 0.0, 1.0);
vec4 textureSpacePosition = gl_Vertex.xyyz;
gl_TexCoord[0] = textureSpacePosition * vec4(splatTextureScalesS[0], splatTextureScalesT[0],
splatTextureScalesS[0], splatTextureScalesT[0]);
gl_TexCoord[1] = textureSpacePosition * vec4(splatTextureScalesS[1], splatTextureScalesT[1],
splatTextureScalesS[1], splatTextureScalesT[1]);
gl_TexCoord[2] = textureSpacePosition * vec4(splatTextureScalesS[2], splatTextureScalesT[2],
splatTextureScalesS[2], splatTextureScalesT[2]);
gl_TexCoord[3] = textureSpacePosition * vec4(splatTextureScalesS[3], splatTextureScalesT[3],
splatTextureScalesS[3], splatTextureScalesT[3]);
// compute the alpha values for each texture
float value = materials[0];