read-front.c 3.21 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 read-front.c
 *
 * Tests that reading the front buffer after a draw to back and swap
 * works correctly.
 *
 * This catches a regression in the Intel driver with DRI2, where the
 * read buffer didn't have an actual buffer present if it hadn't been
 * used as a draw buffer.
 */

#include "GL/glut.h"
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#include "piglit-util.h"

#define WIN_WIDTH 100
#define WIN_HEIGHT 100

static GLboolean Automatic = GL_FALSE;
static int win_width, win_height;

static void display()
{
	GLboolean pass = GL_TRUE;
	int x, y;
	static float red[]   = {1.0, 0.0, 0.0, 0.0};
	static float green[] = {0.0, 1.0, 0.0, 0.0};

	glClearColor(1.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);
	glColor4fv(green);
	piglit_draw_rect(win_width / 2, 0, win_width / 2, win_height);

	glutSwapBuffers();
	glReadBuffer(GL_FRONT);

	for (y = 0; y < win_height; y++) {
		for (x = 0; x < win_width; x++) {
			float *expected;

			if (x >= win_width / 2)
				expected = green;
			else
				expected = red;

			pass &= piglit_probe_pixel_rgb(x, y, expected);
		}
	}

	glReadBuffer(GL_BACK);

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


static void reshape(int width, int height)
{
	win_width = width;
	win_height = height;

	glViewport(0, 0, width, height);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

static void
init(void)
{
	reshape(WIN_WIDTH, WIN_HEIGHT);
}

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 | GLUT_DEPTH | GLUT_STENCIL);
	glutInitWindowSize(WIN_WIDTH, WIN_HEIGHT);
	glutInitWindowPosition(100, 100);
	glutCreateWindow("read-front");
	glutKeyboardFunc(piglit_escape_exit_key);
	init();
	glutDisplayFunc(display);
	glutMainLoop();

	return 0;
}