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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.
*/
/**
* \file rg-teximage-01.c
* Verify setting and getting image data for RED or RG formats
*
* Specify an RGBA image with a RED internal format. Read the image back as
* RGBA. Verify the red components read back match the source image and the
* green, blue, and alpha components are 0, 0, and 1, repsectively.
*
* \author Ian Romanick <ian.d.romanick@intel.com>
*/
#include "piglit-util-gl-common.h"
#include "rg-teximage-common.h"
/**
* Map an integer from [0, maximum] to a float on [0, 2*PI].
*/
#define NORMALIZE_TO_RADIANS(x, maximum) \
(((float) x / (float) maximum) * 2.0 * M_PI)
#define EPSILON (1.0 / 255.0)
/* give a large value for compression */
#define EPSILON_COMP (20.0 / 255.0)
enum piglit_result
piglit_display(void)
{
unsigned i;
for (i = 0; i < num_tex; i++) {
glBindTexture(GL_TEXTURE_2D, tex[i]);
piglit_draw_rect_tex(-1.0 + ((float) (2 * i) / num_tex), -1.0,
2.0 / num_tex, 2.0,
0.0, 0.0, 1.0, 1.0);
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
GLboolean
compare_texture(const GLfloat *orig, const GLfloat *copy,
GLenum orig_fmt, GLenum copy_fmt, unsigned num_pix,
GLboolean has_green)
{
GLboolean logged = GL_FALSE;
GLboolean pass = GL_TRUE;
unsigned i;
float e;
if (orig_fmt == GL_COMPRESSED_RED_RGTC1 || orig_fmt == GL_COMPRESSED_RG_RGTC2 ||
orig_fmt == GL_COMPRESSED_SIGNED_RED_RGTC1 || orig_fmt == GL_COMPRESSED_SIGNED_RG_RGTC2)
e = EPSILON_COMP;
else
e = EPSILON;
for (i = 0; i < num_pix; i++) {
if (fabs(orig[0] - copy[0]) > e) {
if (!logged) {
fprintf(stderr,
"Got bad R channel reading back "
"0x%04x as 0x%04x\n",
orig_fmt, copy_fmt);
logged = GL_TRUE;
}
pass = GL_FALSE;
}
if (has_green && fabs(orig[0] - copy[0]) > e) {
if (!logged) {
fprintf(stderr,
"Got bad G channel reading back "
"0x%04x as 0x%04x\n",
orig_fmt, copy_fmt);
logged = GL_TRUE;
}
pass = GL_FALSE;
}
if ((!has_green && copy[1] != 0.0)
|| copy[2] != 0.0
|| copy[3] != 1.0) {
if (!logged) {
fprintf(stderr,
"Got bad %s channel reading back "
"0x%04x as 0x%04x\n",
has_green ? "B/A" : "G/B/A",
orig_fmt, copy_fmt);
logged = GL_TRUE;
}
pass = GL_FALSE;
}
orig += 4;
copy += 4;
}
return pass;
}
void
generate_rainbow_texture_data(unsigned width, unsigned height, float *img)
{
unsigned i;
unsigned j;
for (i = 0; i < height; i++) {
const float bias = NORMALIZE_TO_RADIANS(i, height);
for (j = 0; j < width; j++) {
const float angle = NORMALIZE_TO_RADIANS(j, width);
img[0] = (cos(angle + bias) + 1.0) * 0.5;
img[1] = (sin(angle - bias) + 1.0) * 0.5;
img[2] = (cos(bias) + 1.0) * 0.5;
img[3] = (sin(bias) + 1.0) * 0.5;
img += 4;
}
}
}
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