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/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* @file fs-discard-exit-2.c
*
* Tests that the discard keyword stops all further execution on that channel.
*
* From the GLSL 1.30 spec revision 9:
*
* "Control flow exits the shader, and subsequent implicit or
* explicit derivatives are undefined when this control flow is
* non-uniform (meaning different fragments within the primitive
* take different control paths)."
*
* Here's the testing plan: Divide the 64x64 window into an 8x8 grid.
* For each grid entry, choose a unique pixel to discard, and then run
* a loop that would infinite loop on that pixel. This should get at
* the intent of the spec and a bug in my first implementation of the
* fix on i965, while also improving our coverage of pixel discard
* (which previously tended to discard big regions that were at least
* 2x2 subspan aligned).
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
64 /*window_width*/,
64 /*window_height*/,
PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DOUBLE)
static int coord1_location, coord2_location;
static const char *vs_source =
"#version 130\n"
"in vec4 vertex;\n"
""
"void main()\n"
"{\n"
" gl_Position = gl_Vertex;\n"
"}\n";
/* This shader will discard one pixel coordinate, and do an infinite
* loop on another pixel. We set the two coordinates to the same, to
* test whether discard on a channel avoids execution on that channel.
*/
static const char *fs_source =
"#version 130\n"
"uniform ivec2 coord1, coord2;\n"
"void main()\n"
"{\n"
" ivec2 fc = ivec2(gl_FragCoord);\n"
" int inc = abs(fc.x - coord2.x) + abs(fc.y - coord2.y);\n"
"\n"
" if (fc == coord1)\n"
" discard;\n"
"\n"
" gl_FragColor = vec4(0);\n"
" for (int i = 0; i < 10; i += inc)\n"
" gl_FragColor.b += 0.1;\n"
"}\n";
enum piglit_result
piglit_display(void)
{
int x, y;
bool pass = true;
float expected[64 * 64 * 4];
glClearColor(0.0, 1.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
for (x = 0; x < 8; x++) {
for (y = 0; y < 8; y++) {
piglit_Uniform2i(coord1_location, x * 9, y * 9);
piglit_Uniform2i(coord2_location, x * 9, y * 9);
piglit_draw_rect(-1.0 + 0.25 * x,
-1.0 + 0.25 * y,
0.25,
0.25);
}
}
for (x = 0; x < 64; x++) {
for (y = 0; y < 64; y++) {
int sx = x % 8;
int sy = y % 8;
int dx = fabs(sx - x / 8);
int dy = fabs(sy - y / 8);
float pixel[4];
if (dx == 0 && dy == 0) {
pixel[0] = 0.0;
pixel[1] = 1.0;
pixel[2] = 0.0;
pixel[3] = 0.0;
} else {
int i;
pixel[0] = 0.0;
pixel[1] = 0.0;
pixel[2] = 0.0;
pixel[3] = 0.0;
for (i = 0; i < 10; i += (dx + dy))
pixel[2] += 0.1;
}
memcpy(expected + (y * 64 + x) * 4, pixel, 4 * 4);
}
}
pass = piglit_probe_image_rgba(0, 0, 64, 64, expected);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
int vs, fs, prog;
piglit_require_GLSL_version(130);
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
prog = piglit_link_simple_program(vs, fs);
if (!vs || !fs || !prog)
piglit_report_result(PIGLIT_FAIL);
coord1_location = piglit_GetUniformLocation(prog, "coord1");
coord2_location = piglit_GetUniformLocation(prog, "coord2");
piglit_UseProgram(prog);
}
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