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69 lines
No EOL
2.5 KiB
GLSL
69 lines
No EOL
2.5 KiB
GLSL
#version 120
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#extension GL_ARB_geometry_shader4 : enable
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//
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// VOXEL GEOMETRY SHADER
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//
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// Input: gl_VerticesIn/gl_PositionIn
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// GL_POINTS
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// Assumes vertex shader has not transformed coordinates
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// Each gl_PositionIn is the corner of voxel
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//
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// Second dataset (? similar to how voxel avatars pass in bones??)
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// which is the voxel size
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//
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// Note: In vertex shader doesn't do any transform. Therefore passing the 3D world coordinates xyz to us
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//
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// Output: GL_TRIANGLE_STRIP
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//
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// Issues:
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// how do we need to handle lighting of these colors??
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// how do we handle normals?
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// check for size=0 and don't output the primitive
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//
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varying in float voxelSize[1];
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const int VERTICES_PER_FACE = 4;
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const int COORD_PER_VERTEX = 3;
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const int COORD_PER_FACE = COORD_PER_VERTEX * VERTICES_PER_FACE;
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void faceOfVoxel(vec4 corner, float scale, float[COORD_PER_FACE] facePoints, vec4 color) {
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for (int v = 0; v < VERTICES_PER_FACE; v++ ) {
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vec4 vertex = corner;
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for (int c = 0; c < COORD_PER_VERTEX; c++ ) {
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int cIndex = c + (v * COORD_PER_VERTEX);
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vertex[c] += (facePoints[cIndex] * scale);
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}
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gl_FrontColor = color;
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gl_Position = gl_ModelViewProjectionMatrix * vertex;
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EmitVertex();
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}
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EndPrimitive();
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}
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void main() {
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//increment variable
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int i;
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vec4 corner;
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float scale;
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float bottomFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1 );
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float topFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1 );
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float rightFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1 );
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float leftFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1 );
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float frontFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0 );
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float backFace[COORD_PER_FACE] = float[COORD_PER_FACE]( 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1 );
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for(i = 0; i < gl_VerticesIn; i++) {
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corner = gl_PositionIn[i];
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scale = voxelSize[i];
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faceOfVoxel(corner, scale, bottomFace, gl_FrontColorIn[i]);
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faceOfVoxel(corner, scale, topFace, gl_FrontColorIn[i]);
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faceOfVoxel(corner, scale, rightFace, gl_FrontColorIn[i]);
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faceOfVoxel(corner, scale, leftFace, gl_FrontColorIn[i]);
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faceOfVoxel(corner, scale, frontFace, gl_FrontColorIn[i]);
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faceOfVoxel(corner, scale, backFace, gl_FrontColorIn[i]);
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}
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} |