glsl-fs-fragcoord.c 3.3 KB
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/*
 * Copyright © 2009 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/** @file glsl-fs-fragcoord.c
 *
 * Tests that gl_FragCoord produces the expected output in a fragment shader.
 */

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/glew.h>
#if defined(__APPLE__)
#include <GLUT/glut.h>
#else
#include "GL/glut.h"
#endif

#include "piglit-util.h"

#define WIN_WIDTH 256
#define WIN_HEIGHT 256

static GLint prog;
static GLboolean Automatic;

static void
display(void)
{
	GLboolean pass = GL_TRUE;
	int x, y;

	glClearColor(0.5, 0.5, 0.5, 0.5);
	glClear(GL_COLOR_BUFFER_BIT);

	piglit_draw_rect(0, 0, WIN_WIDTH, WIN_HEIGHT);

	for (y = 0; y < WIN_HEIGHT; y++) {
		for (x = 0; x < WIN_WIDTH; x++) {
			float color[3];

			color[0] = x / 256.0;
			color[1] = y / 256.0;
			color[2] = 0;

			pass &= piglit_probe_pixel_rgb(x, y, color);
			if (!pass)
				break;
		}
	}

	glutSwapBuffers();

	if (Automatic)
		piglit_report_result(pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE);
}

static void init()
{
	GLint vs, fs;

	/* Set up projection matrix so we can just draw using window
	 * coordinates.
	 */
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	glOrtho(0, WIN_WIDTH, 0, WIN_HEIGHT, -1, 1);

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();

	vs = piglit_compile_shader(GL_VERTEX_SHADER,
				   SOURCE_DIR "tests/shaders/glsl-fs-fragcoord.vert");
	fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
				   SOURCE_DIR "tests/shaders/glsl-fs-fragcoord.frag");

	prog = piglit_link_simple_program(vs, fs);

	glUseProgram(prog);
}

int main(int argc, char**argv)
{
	int i;

	glutInit(&argc, argv);

	for(i = 1; i < argc; ++i) {
		if (!strcmp(argv[i], "-auto"))
			Automatic = 1;
		else
			printf("Unknown option: %s\n", argv[i]);
	}

	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(WIN_WIDTH, WIN_HEIGHT);
	glutCreateWindow("glsl-fs-fragcoord");
	glutKeyboardFunc(piglit_escape_exit_key);
	glutDisplayFunc(display);
	glewInit();

	if (!GLEW_VERSION_2_0) {
		printf("Requires OpenGL 2.0\n");
		piglit_report_result(PIGLIT_SKIP);
		exit(1);
	}
	init();

	glutMainLoop();

	return 0;
}