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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 fbo-3d.c
*
* Tests that drawing to each depth of a 3D texture FBO and then drawing views
* of those individual depths to the window system framebuffer succeeds.
*/
#include "piglit-util.h"
#define BUF_WIDTH 32
#define BUF_HEIGHT 32
int piglit_width = 200;
int piglit_height = 100;
int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
#define NUM_DEPTHS 6
#define POT_DEPTHS 8
float depth_color[NUM_DEPTHS][4] = {
{1.0, 0.0, 0.0, 0.0},
{0.0, 1.0, 0.0, 0.0},
{0.0, 0.0, 1.0, 0.0},
{1.0, 0.0, 1.0, 0.0},
{1.0, 1.0, 0.0, 0.0},
{0.0, 1.0, 1.0, 0.0},
};
int pot_depth;
static int
create_3d_fbo(void)
{
GLuint tex, fb;
GLenum status;
int depth;
pot_depth = glutExtensionSupported("GL_ARB_texture_non_power_of_two") ?
NUM_DEPTHS: POT_DEPTHS;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_3D, tex);
/* allocate empty 3D texture */
glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA,
BUF_WIDTH, BUF_HEIGHT, pot_depth,
0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
assert(glGetError() == 0);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
/* draw something into each slice of the 3D texture */
for (depth = 0; depth < NUM_DEPTHS; depth++) {
glFramebufferTexture3DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_3D,
tex,
0,
depth);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "FBO incomplete\n");
goto done;
}
glViewport(0, 0, BUF_WIDTH, BUF_HEIGHT);
piglit_ortho_projection(BUF_WIDTH, BUF_HEIGHT, GL_FALSE);
/* solid color quad */
glColor4fv(depth_color[depth]);
piglit_draw_rect(-2, -2, BUF_WIDTH + 2, BUF_HEIGHT + 2);
}
done:
glDeleteFramebuffersEXT(1, &fb);
return tex;
}
/* Draw a textured quad, sampling only the given depth/slice of the
* 3D texture.
*/
static void
draw_depth(int x, int y, int depth)
{
float depth_coord = (float)depth / (pot_depth - 1);
glViewport(0, 0, piglit_width, piglit_height);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glEnable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glBegin(GL_QUADS);
glTexCoord3f(0, 0, depth_coord);
glVertex2f(x, y);
glTexCoord3f(1, 0, depth_coord);
glVertex2f(x + BUF_WIDTH, y);
glTexCoord3f(1, 1, depth_coord);
glVertex2f(x + BUF_WIDTH, y + BUF_HEIGHT);
glTexCoord3f(0, 1, depth_coord);
glVertex2f(x, y + BUF_HEIGHT);
glEnd();
}
static GLboolean test_depth_drawing(int start_x, int start_y, float *expected)
{
return piglit_probe_rect_rgb(start_x, start_y, BUF_WIDTH, BUF_HEIGHT,
expected);
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int depth;
GLuint tex;
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
tex = create_3d_fbo();
for (depth = 0; depth < NUM_DEPTHS; depth++) {
int x = 1 + depth * (BUF_WIDTH + 1);
int y = 1;
draw_depth(x, y, depth);
}
for (depth = 0; depth < NUM_DEPTHS; depth++) {
int x = 1 + depth * (BUF_WIDTH + 1);
int y = 1;
pass &= test_depth_drawing(x, y, depth_color[depth]);
}
glDeleteTextures(1, &tex);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_EXT_framebuffer_object");
}
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