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[require]
GLSL >= 1.50
GL_ARB_tessellation_shader
[vertex shader passthrough]
[tessellation control shader]
#extension GL_ARB_tessellation_shader: require
layout(vertices = 6) out;
patch out int val[6];
patch out vec4 pcolor;
void main() {
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
if (gl_InvocationID < val.length())
val[gl_InvocationID] = gl_InvocationID;
pcolor = vec4(0, 1, 0, 1);
barrier();
for (int i = 0; i < val.length(); i++) {
// Switch things up so that each invocation checks
// different locations
int index = (i + gl_InvocationID) % val.length();
if (val[index] != index)
pcolor = vec4(1, 0, 0, 1);
}
gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 0.0);
gl_TessLevelInner = float[2](0.0, 0.0);
}
[tessellation evaluation shader]
#extension GL_ARB_tessellation_shader: require
layout(triangles) in;
patch in vec4 pcolor;
out vec4 color;
void main() {
gl_Position = gl_in[0].gl_Position * gl_TessCoord[0]
+ gl_in[1].gl_Position * gl_TessCoord[1]
+ gl_in[2].gl_Position * gl_TessCoord[2];
color = pcolor;
}
[fragment shader]
in vec4 color;
void main()
{
gl_FragColor = color;
}
[vertex data]
piglit_vertex/float/2
-1.0 -1.0
1.0 -1.0
-1.0 1.0
-1.0 1.0
1.0 -1.0
1.0 1.0
-1.0 1.0
1.0 -1.0
1.0 1.0
-1.0 1.0
1.0 -1.0
1.0 1.0
[test]
clear color 0.0 0.0 0.0 1.0
clear
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
probe all rgba 0.0 1.0 0.0 1.0
clear color 0.0 0.0 0.0 1.0
clear
patch parameter vertices 6
draw arrays GL_PATCHES 0 12
probe all rgba 0.0 1.0 0.0 1.0
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