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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.
*/
/**
* fs-execution-ordering.c
*
* Confirm that fragment shader outputs are written to the color
* buffer in the correct order, even if some fragments take
* dramatically longer to execute than others.
*
* Since this test is looking for race conditions, it repeats 100
* times, drawing different primitives sizes, to increase the chances
* of a race condition occurring.
*/
#include "piglit-util-gl-common.h"
#define SHIFT_COUNT 64
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
#define SMALL_COMPOSITE 4
#define LARGE_PRIME 7919
GLint prog;
GLuint vbo_handle;
static const char *vstext =
"#version 130\n"
"in uint num;\n"
"in vec4 pos;\n"
"flat out uint number_to_classify;\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = pos;\n"
" number_to_classify = num;\n"
"}\n";
/* This fragment shader implements a simple primality test using trial
* division. It outputs a color of red if its input is prime, and
* green if its input is composite.
*
* Note: no special effort has been made to use a very fast algorithm,
* since the purpose of the shader is to have dramatically different
* execution times based on the input parameter.
*/
static const char *fstext =
"#version 130\n"
"flat in uint number_to_classify;\n"
"\n"
"void main()\n"
"{\n"
" bool factor_found = false;\n"
" for (uint i = 2u; i < number_to_classify; ++i) {\n"
" if (number_to_classify % i == 0u)\n"
" factor_found = true;\n"
" }\n"
" gl_FragColor = factor_found ?\n"
" vec4(0.0, 1.0, 0.0, 1.0) :\n"
" vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
void
piglit_init(int argc, char **argv)
{
piglit_require_GLSL_version(130);
prog = piglit_build_simple_program(vstext, fstext);
glGenBuffers(1, &vbo_handle);
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
}
bool
do_test(unsigned size)
{
float expected_color[4] = { 0.0, 1.0, 0.0, 1.0 };
/* Set up the necessary vertex array to draw two squares, each
* size x size pixels. The first square is drawn using a
* large prime number for the "num" parameter, so it will be
* drawn in red and take a long time to compute. The second
* square is drawn using a small composite number for the
* "num" parameter, so it will be drawn in green and take a
* short time to compute.
*
* Even though the second square takes a short time to
* compute, it should be written to the color buffer after the
* first square, so the result should be a green square.
*/
GLfloat xmin = -1.0;
GLfloat ymin = -1.0;
GLfloat xmax = 2.0 * size / piglit_width - 1.0;
GLfloat ymax = 2.0 * size / piglit_height - 1.0;
struct vertex_attributes {
GLfloat pos[2];
GLuint num;
} vertex_data[] = {
{ { xmin, ymin }, LARGE_PRIME },
{ { xmin, ymax }, LARGE_PRIME },
{ { xmax, ymax }, LARGE_PRIME },
{ { xmin, ymin }, LARGE_PRIME },
{ { xmax, ymax }, LARGE_PRIME },
{ { xmax, ymin }, LARGE_PRIME },
{ { xmin, ymin }, SMALL_COMPOSITE },
{ { xmax, ymax }, SMALL_COMPOSITE },
{ { xmax, ymin }, SMALL_COMPOSITE },
{ { xmin, ymin }, SMALL_COMPOSITE },
{ { xmin, ymax }, SMALL_COMPOSITE },
{ { xmax, ymax }, SMALL_COMPOSITE },
};
size_t stride = sizeof(vertex_data[0]);
GLint pos_index = glGetAttribLocation(prog, "pos");
GLint num_index = glGetAttribLocation(prog, "num");
glBindBuffer(GL_ARRAY_BUFFER, vbo_handle);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data), &vertex_data,
GL_STATIC_DRAW);
glVertexAttribPointer(pos_index, 2, GL_FLOAT, GL_FALSE, stride,
(void *) offsetof(struct vertex_attributes,
pos));
glVertexAttribIPointer(num_index, 1, GL_UNSIGNED_INT, stride,
(void *) offsetof(struct vertex_attributes,
num));
glEnableVertexAttribArray(pos_index);
glEnableVertexAttribArray(num_index);
/* Draw the squares and check their color. */
glDrawArrays(GL_TRIANGLES, 0, ARRAY_SIZE(vertex_data));
return piglit_probe_rect_rgba(0, 0, size, size, expected_color);
}
enum piglit_result
piglit_display(void)
{
enum piglit_result result = PIGLIT_PASS;
unsigned size;
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
for (size = 1; size <= 100; ++size) {
if (!do_test(size)) {
printf("Failed at rect size %dx%d\n", size, size);
result = PIGLIT_FAIL;
break;
}
}
piglit_present_results();
return result;
}
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