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/*
* Copyright © 2011 Henri Verbeet <hverbeet@gmail.com>
*
* 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-depthtex.c
*
* Tests that texturing from a depth texture works after it was updated
* through an FBO. Specifically test the case where the sampler view for the
* depth texture would be created before the draw to that texture.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 640;
config.window_height = 480;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
static void
check_fbo_status()
{
GLint status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
printf("FBO incomplete (status = 0x%04x)\n", status);
piglit_report_result(PIGLIT_SKIP);
}
}
enum piglit_result piglit_display(void)
{
static const char *frag_src =
"!!ARBfp1.0\n"
"TEX result.color, fragment.texcoord[0], texture[0], 2D;\n"
"END";
static const struct
{
int x;
int y;
float color[3];
}
expected[] =
{
{ 64, 240, {0.1f, 0.1f, 0.1f}},
{ 192, 240, {0.3f, 0.3f, 0.3f}},
{ 320, 240, {0.5f, 0.5f, 0.5f}},
{ 448, 240, {0.7f, 0.7f, 0.7f}},
{ 576, 240, {0.9f, 0.9f, 0.9f}},
};
GLuint fbo, frag, db_tex, cb_tex;
GLboolean pass = GL_TRUE;
char *tex_data;
unsigned int i;
frag = piglit_compile_program(GL_FRAGMENT_PROGRAM_ARB, frag_src);
glGenFramebuffersEXT(1, &fbo);
glGenTextures(1, &cb_tex);
glGenTextures(1, &db_tex);
tex_data = calloc(piglit_width * piglit_height, 4);
glBindTexture(GL_TEXTURE_2D, db_tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, piglit_width, piglit_height,
0, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, tex_data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, cb_tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, piglit_width, piglit_height,
0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, tex_data);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
free(tex_data);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, db_tex, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, cb_tex, 0);
check_fbo_status();
glViewport(0, 0, piglit_width, piglit_height);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
glDepthMask(GL_TRUE);
/* Draw with the texture to make sure a sampler view is created for
* it before it's used as depth buffer by the FBO. */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glBindTexture(GL_TEXTURE_2D, db_tex);
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, frag);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
glEnable(GL_TEXTURE_2D);
piglit_draw_rect_tex(-1.0f, -1.0f, 2.0f, 2.0f,
0.0f, 0.0f, 1.0f, 1.0f);
/* Fill the depth buffer with a gradient. */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
check_fbo_status();
glDisable(GL_FRAGMENT_PROGRAM_ARB);
glDisable(GL_TEXTURE_2D);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClearDepth(0.5f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(0.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLE_STRIP);
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glEnd();
/* Draw the depth texture as greyscale to the backbuffer. */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
glEnable(GL_TEXTURE_2D);
piglit_draw_rect_tex(-1.0f, -1.0f, 2.0f, 2.0f,
0.0f, 0.0f, 1.0f, 1.0f);
for (i = 0; i < sizeof(expected) / sizeof(*expected); ++i)
{
pass &= piglit_probe_pixel_rgb(expected[i].x, expected[i].y, expected[i].color);
}
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_fragment_program");
}
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