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[require]
GLSL >= 1.10
[vertex shader]
/* Tests for a bug in the 965 vertex shader backend where kills of
* overwritten copy propagation sources didn't happen when new
* propagation entries were being created.
*/
uniform vec4 u;
uniform int j;
varying vec4 color;
void main()
{
float a;
float b = u.y;
color = u;
/* This loop tricks core GLSL into not optimizing out the
* pattern for hitting the driver bug.
*/
for (int i = 0; i < j; i++) {
a = b; /* a = 1.0 */
b = color.z; /* b = 0 */
color.z = a; /* color.z = 0.5, but the bug makes it 0. */
}
gl_Position = gl_Vertex;
}
[fragment shader]
varying vec4 color;
void main()
{
gl_FragColor = color;
}
[test]
uniform vec4 u 0 1 0 0
uniform int j 1
draw rect -1 -1 2 2
probe all rgba 0 1 1 0
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