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# From the GLSL 4.40 spec, section 6.4 (Jumps):
#
# The continue jump is used only in loops. It skips the remainder
# of the body of the inner most loop of which it is inside. For
# while and do-while loops, this jump is to the next evaluation of
# the loop condition-expression from which the loop continues as
# previously defined.
#
# As of 1/31/2014 (commit db8b6fb), Mesa handles "continue" inside a
# do-while loop incorrectly; instead of jumping to the loop
# condition-expression, it jumps to the top of the loop. This is
# particularly problematic because it can lead to infinite loops.
#
# This test verifies correct behaviour of "continue" inside do-while
# loops without risking an infinite loop.
[require]
GLSL >= 1.10
[vertex shader]
void main()
{
gl_Position = gl_Vertex;
}
[fragment shader]
void main()
{
int x = 0;
int y = 0;
do { // 1st iteration 2nd iteration 3rd iteration
++x; // x <- 1 x <- 2 x <- 3
if (x >= 4) // false false false
break;
if (x >= 2) // false true true
continue;
++y; // y=1 skipped skipped
} while (x < 3); // true true false
// The "continue" should skip ++y on all iterations but the first,
// so y should now be 1. The "continue" should not skip (x < 3)
// ever, so the loop should terminate when x == 3 (not 4).
if (x == 3 && y == 1)
gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
else
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
[test]
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
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