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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 fbo-scissor-blit.c
*
* Since window system framebuffers use a different coordinate system
* than fbo's, it is important to check that glBlitFramebuffer()
* interprets scissor coordinates correctly depending whether the
* destination framebuffer is an fbo or a window. This test verifies
* proper scissor operation in both cases.
*
* The test takes a single command-line argument: "window" to test
* scissoring in a window, and "fbo" to test scissoring in an fbo. In
* the fbo case, the final image is blitted to the window afterwards
* (without scissoring it) so that failures can be easily diagnosed.
*/
#include "piglit-util-gl-common.h"
static const int width = 128, height = 128;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = width;
config.window_height = height;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static GLuint src_fbo;
static GLuint ref_fbo;
static GLuint dst_fbo;
static GLuint
setup_framebuffer()
{
GLuint fbo, rb;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
glGenRenderbuffers(1, &rb);
glBindRenderbuffer(GL_RENDERBUFFER, rb);
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA, width, height);
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, rb);
if (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER)
!= GL_FRAMEBUFFER_COMPLETE) {
printf("Framebuffer incomplete\n");
piglit_report_result(PIGLIT_FAIL);
}
return fbo;
}
static void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <dst_fb_type>\n"
" where <dst_fb_type> is one of:\n"
" fbo\n"
" window\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
bool blit_to_fbo;
if (argc != 2)
print_usage_and_exit(argv[0]);
if (strcmp(argv[1], "window") == 0)
blit_to_fbo = false;
else if (strcmp(argv[1], "fbo") == 0)
blit_to_fbo = true;
else
print_usage_and_exit(argv[0]);
piglit_require_extension("GL_ARB_framebuffer_object");
src_fbo = setup_framebuffer();
ref_fbo = setup_framebuffer();
if (blit_to_fbo)
dst_fbo = setup_framebuffer();
else
dst_fbo = 0;
}
enum piglit_result
piglit_display(void)
{
float red[4] = {1.0, 0.0, 0.0, 0.0};
float green[4] = {0.0, 1.0, 0.0, 0.25};
float blue[4] = {0.0, 0.0, 1.0, 0.5};
float white[4] = {1.0, 1.0, 1.0, 1.0};
float grey[4] = {0.5, 0.5, 0.5, 0.5};
bool pass;
float *ref_image;
/* Draw the source image to src_fbo */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, src_fbo);
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, width / 2, height / 2);
glClearColor(red[0], red[1], red[2], red[3]);
glClear(GL_COLOR_BUFFER_BIT);
glScissor(width / 2, 0, width / 2, height / 2);
glClearColor(green[0], green[1], green[2], green[3]);
glClear(GL_COLOR_BUFFER_BIT);
glScissor(0, height / 2, width / 2, height / 2);
glClearColor(blue[0], blue[1], blue[2], blue[3]);
glClear(GL_COLOR_BUFFER_BIT);
glScissor(width / 2, height / 2, width / 2, height / 2);
glClearColor(white[0], white[1], white[2], white[3]);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glClearColor(grey[0], grey[1], grey[2], grey[3]);
/* Blit to dst_fbo, scissoring the image in an asymmetrical way. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
glScissor(10, 20, width - 40, height - 60);
glBlitFramebuffer(0, 0, width, height,
0, 0, width, height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
glDisable(GL_SCISSOR_TEST);
/* Blit to ref_fbo, simulating the correct scissoring effect
* by manually adjusting the coordinates.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ref_fbo);
glClear(GL_COLOR_BUFFER_BIT);
glBlitFramebuffer(10, 20, width - 30, height - 40,
10, 20, width - 30, height - 40,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Read the reference image from ref_fbo */
ref_image = malloc(sizeof(float) * 4 * width * height);
glBindFramebuffer(GL_READ_FRAMEBUFFER, ref_fbo);
glReadPixels(0, 0, width, height, GL_RGBA, GL_FLOAT, ref_image);
/* Compare the image in dst_fbo with the reference image */
glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo);
pass = piglit_probe_image_rgba(0, 0, width, height, ref_image);
if (dst_fbo != 0) {
/* Show the contents of dst_fbo in the window */
glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, width, height,
0, 0, width, height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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