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/*
* Copyright 2010 VMware, Inc.
*
* 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.
*/
/*
* Test building a mipmap in various orders:
* From largest to smallest
* From smallest to largest
* Random order.
*
* Author: Brian Paul
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
200 /*window_width*/,
200 /*window_height*/,
PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB)
#define MAX_LEVEL 7
enum order {
NORMAL,
REVERSE,
RANDOM
};
static GLubyte
level_intensity(GLint level)
{
return 100 + level * 20;
}
static void
setup_tex_image(GLint level)
{
GLint size = 1 << (MAX_LEVEL - level);
GLubyte *img = malloc(size * size * 4);
GLubyte val = level_intensity(level);
memset(img, val, size * size * 4);
glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, size, size, 0,
GL_RGBA, GL_UNSIGNED_BYTE, img);
free(img);
}
/*
* Generate a mipmapped texture.
* Define the mipmap levels/images in the order specified by 'ord'.
*/
static void
generate_mipmap(enum order ord)
{
GLuint tex;
GLint level;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
/* hint to the driver that there won't be a mipmap (but that's a lie) */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
/* Set each mipmap level to a different intensity, starting with the
* smallest mipmap level and ending with the largest at level=0.
*/
if (ord == NORMAL) {
for (level = 0; level <= MAX_LEVEL; level++) {
setup_tex_image(level);
}
}
else if (ord == REVERSE) {
for (level = MAX_LEVEL; level >= 0; level--) {
setup_tex_image(level);
}
}
else {
static const GLuint rand[MAX_LEVEL + 1] = {3, 1, 2, 4, 7, 0, 6, 5};
assert(ord == RANDOM);
for (level = 0; level <= MAX_LEVEL; level++) {
setup_tex_image(rand[level]);
}
}
/* use mipmap filtering */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
static GLboolean
test(enum order ord, const char *order)
{
const int px = piglit_width / 2, py = piglit_height / 2;
GLboolean pass = GL_TRUE;
GLuint level;
generate_mipmap(ord);
glEnable(GL_TEXTURE_2D);
/* render a test polygon for each mipmap level */
for (level = 0; level <= MAX_LEVEL; level++) {
float expected[4];
int p;
expected[0] = expected[1] = expected[2] = level_intensity(level) / 255.0;
/* force sampling from a specific mipmap level */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, level);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, level);
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_POLYGON);
glTexCoord2f(0, 0);
glVertex2f(-1, -1);
glTexCoord2f(1, 0);
glVertex2f(1, -1);
glTexCoord2f(1, 1);
glVertex2f(1, 1);
glTexCoord2f(0, 1);
glVertex2f(-1, 1);
glEnd();
p = piglit_probe_pixel_rgb(px, py, expected);
if (!p) {
printf(" At mipmap level %d, order = %s\n", level, order);
}
pass &= p;
piglit_present_results();
}
return pass;
}
void
piglit_init(int argc, char **argv)
{
/* nothing */
}
enum piglit_result
piglit_display(void)
{
if (!test(NORMAL, "Normal"))
return PIGLIT_FAIL;
if (!test(REVERSE, "Reverse"))
return PIGLIT_FAIL;
if (!test(RANDOM, "Random"))
return PIGLIT_FAIL;
return PIGLIT_PASS;
}
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