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# This tests unrolling of a loop with a single exit point but where the
# exact trip count is unknown, only the max iteration count (4) is known.
#
# Here we test all possible outcomes for the loop and also add some
# unreachable code to make sure it is not accessible after unrolling.
[require]
GLSL >= 1.10
[vertex shader]
uniform int loop_count;
void main()
{
gl_Position = gl_Vertex;
vec4 colour = vec4(1.0, 1.0, 1.0, 1.0);
int i = 0;
int x = 0;
while (x < loop_count && i < 4) {
if (x == 0 && i == 0)
colour = vec4(0.0, 0.25, 0.0, 1.0);
if (x == 2 && i == 1)
colour = vec4(0.0, 0.5, 0.0, 1.0);
if (x == 4 && i == 2)
colour = vec4(0.0, 0.75, 0.0, 1.0);
if (x == 6 && i == 3)
colour = vec4(0.0, 1.0, 0.0, 1.0);
/* This should be unreachable */
if (x >= 8 || i >= 4)
colour = vec4(1.0, 0.0, 0.0, 1.0);
i++;
x+=2;
}
gl_FrontColor = colour;
}
[fragment shader]
void main()
{
gl_FragColor = gl_Color;
}
[test]
clear color 0.5 0.5 0.5 0.5
uniform int loop_count 0
draw rect -1 -1 2 2
probe all rgba 1.0 1.0 1.0 1.0
uniform int loop_count 2
draw rect -1 -1 2 2
probe all rgba 0.0 0.25 0.0 1.0
uniform int loop_count 4
draw rect -1 -1 2 2
probe all rgba 0.0 0.5 0.0 1.0
uniform int loop_count 6
draw rect -1 -1 2 2
probe all rgba 0.0 0.75 0.0 1.0
uniform int loop_count 8
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
uniform int loop_count 10
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
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