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/*
* Copyright © 2010 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 fbo-readpixels-small.c
*
* Tests that PBO blit readpixels on a 2x2 FBO works correctly. Based
* on a description of a failure in clutter and figuring out the associated
* bug.
*
* https://bugs.freedesktop.org/show_bug.cgi?id=25921
*/
#include "piglit-util-gl-common.h"
#define BUF_WIDTH 8
#define BUF_HEIGHT 8
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 50;
config.window_height = 50;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
static void
make_fbo(GLuint *fbo, GLuint *tex)
{
GLenum status;
glGenTextures(1, tex);
glBindTexture(GL_TEXTURE_2D, *tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
2, 2, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glGenFramebuffersEXT(1, fbo);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, *fbo);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D,
*tex,
0);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "framebuffer incomplete (status = 0x%04x)\n",
status);
abort();
}
}
static GLboolean
probe(int x, int y, uint32_t expected, uint32_t observed)
{
if ((expected & 0xffffff) != (observed & 0xffffff)) {
printf("Probe at (%i,%i)\n", x, y);
printf(" Expected: 0x%08x\n", expected);
printf(" Observed: 0x%08x\n", observed);
return GL_FALSE;
} else {
return GL_TRUE;
}
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
GLuint fbo, tex, pbo;
uint32_t *addr;
make_fbo(&fbo, &tex);
glClear(GL_COLOR_BUFFER_BIT);
glGenBuffersARB(1, &pbo);
glBindBufferARB(GL_PIXEL_PACK_BUFFER, pbo);
glBufferDataARB(GL_PIXEL_PACK_BUFFER, 4 * 4, NULL, GL_STREAM_DRAW_ARB);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glViewport(0, 0, 2, 2);
piglit_ortho_projection(2, 2, GL_FALSE);
/* bottom: green. top: blue. */
glColor4f(0.0, 1.0, 0.0, 0.0);
piglit_draw_rect(0, 0, 2, 1);
glColor4f(0.0, 0.0, 1.0, 0.0);
piglit_draw_rect(0, 1, 2, 1);
/* Read the whole buffer. */
glReadPixels(0, 0, 2, 2,
GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)0);
addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
pass &= probe(0, 0, 0x0000ff00, addr[0]);
pass &= probe(1, 0, 0x0000ff00, addr[1]);
pass &= probe(0, 1, 0x000000ff, addr[2]);
pass &= probe(1, 1, 0x000000ff, addr[3]);
glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
/* Read with an offset. */
glReadPixels(1, 0, 1, 1,
GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
pass &= probe(1, 0, 0x0000ff00, addr[1]);
glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
/* Read with an offset. */
glReadPixels(1, 1, 1, 1,
GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
pass &= probe(1, 1, 0x000000ff, addr[1]);
glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
glDeleteBuffersARB(1, &pbo);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glViewport(0, 0, piglit_width, piglit_height);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glBindTexture(GL_TEXTURE_2D, tex);
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
piglit_draw_rect_tex(0, 0, piglit_width, piglit_height,
0, 0, 1, 1);
glDisable(GL_TEXTURE_2D);
glDeleteFramebuffersEXT(1, &fbo);
glDeleteTextures(1, &tex);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_EXT_framebuffer_object");
piglit_require_extension("GL_ARB_pixel_buffer_object");
glDisable(GL_DITHER);
}
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