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# According to GL 3.2 section 2.11.6 ("Varying Variables") and
# ARB_tessellation_shader
#
# All components of any varying and special variable written are counted
# against the gl_MaxVertexOutputComponents limit.
# All components of any varying and special variable read are counted
# against the gl_MaxTessControlInputComponents limit.
# gl_Position is a special variables, thus it takes 4 components.
[require]
GLSL >= 1.50
GL_ARB_tessellation_shader
[vertex shader]
#version 150
#extension GL_ARB_tessellation_shader: require
in vec4 piglit_vertex;
out Data {
out ivec4 f[min(gl_MaxVertexOutputComponents, gl_MaxTessControlInputComponents) / 4 - 1];
} data;
void main()
{
gl_Position = piglit_vertex;
for (int i = 0; i < data.f.length(); i++)
data.f[i] = ivec4(i * 4, i * 4 + 1, i * 4 + 2, i * 4 + 3);
}
[tessellation control shader]
#version 150
#extension GL_ARB_tessellation_shader: require
layout(vertices = 3) out;
in Data {
ivec4 f[min(gl_MaxVertexOutputComponents, gl_MaxTessControlInputComponents) / 4 - 1];
} data[];
out int tcs_result[3];
void main() {
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 0.0);
gl_TessLevelInner = float[2](0.0, 0.0);
tcs_result[gl_InvocationID] = 1;
for (int i = 0; i < data[gl_InvocationID].f.length(); i++) {
if (data[gl_InvocationID].f[i] != ivec4(i * 4, i * 4 + 1, i * 4 + 2, i * 4 + 3))
tcs_result[gl_InvocationID] = 0;
}
}
[tessellation evaluation shader]
#version 150
#extension GL_ARB_tessellation_shader: require
layout(triangles) in;
in int tcs_result[gl_MaxPatchVertices];
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];
bool ok = true;
for (int i = 0; i < 3; i++) {
ok = ok && (tcs_result[i] == 1);
}
color = ok ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
}
[fragment shader]
#version 150
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
[test]
clear color 0.1 0.1 0.1 0.1
clear
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
probe all rgba 0.0 1.0 0.0 1.0
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