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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-cubemap.c
*
* Tests that drawing to each face of a cube map FBO and then drawing views
* of those faces 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;
float face_color[7][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},
{1.0, 1.0, 1.0, 0.0},
};
static float *get_face_color(int face, int level)
{
return face_color[(face + 2 * level) % 7];
}
static int
create_cube_fbo(void)
{
GLuint tex, fb;
GLenum status;
int face, dim;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_CUBE_MAP, tex);
for (face = 0; face < 6; face++) {
int level = 0;
for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
glTexImage2D(cube_face_targets[face], level, GL_RGBA,
dim, dim,
0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
level++;
}
}
assert(glGetError() == 0);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
for (face = 0; face < 6; face++) {
int level = 0;
for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
cube_face_targets[face],
tex,
level);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "FBO incomplete\n");
goto done;
}
glViewport(0, 0, dim, dim);
piglit_ortho_projection(dim, dim, GL_FALSE);
glColor4fv(get_face_color(face, level));
/* Draw a little outside the bounds to make
* sure clipping's working.
*/
piglit_draw_rect(-2, -2, dim + 2, dim + 2);
level++;
}
}
done:
glDeleteFramebuffersEXT(1, &fb);
return tex;
}
static void
draw_face(int x, int y, int dim, int face)
{
glViewport(0, 0, piglit_width, piglit_height);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glEnable(GL_TEXTURE_CUBE_MAP);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBegin(GL_QUADS);
glTexCoord3fv(cube_face_texcoords[face][0]);
glVertex2f(x, y);
glTexCoord3fv(cube_face_texcoords[face][1]);
glVertex2f(x + dim, y);
glTexCoord3fv(cube_face_texcoords[face][2]);
glVertex2f(x + dim, y + dim);
glTexCoord3fv(cube_face_texcoords[face][3]);
glVertex2f(x, y + dim);
glEnd();
glDisable(GL_TEXTURE_CUBE_MAP);
}
static GLboolean test_face_drawing(int start_x, int start_y, int dim,
float *expected)
{
return piglit_probe_rect_rgb(start_x, start_y, dim, dim, expected);
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int face, dim;
GLuint tex;
glClearColor(0.5, 0.5, 0.5, 0.5);
glClear(GL_COLOR_BUFFER_BIT);
tex = create_cube_fbo();
for (face = 0; face < 6; face++) {
int x = 1 + face * (BUF_WIDTH + 1);
int y = 1;
for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
draw_face(x, y, dim, face);
y += dim + 1;
}
}
for (face = 0; face < 6; face++) {
int x = 1 + face * (BUF_WIDTH + 1);
int y = 1;
int level = 0;
for (dim = BUF_WIDTH; dim > 2; dim >>= 1) {
pass &= test_face_drawing(x, y, dim,
get_face_color(face, level));
y += dim + 1;
level++;
}
}
glDeleteTextures(1, &tex);
glutSwapBuffers();
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_texture_cube_map");
}
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