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/*
* Copyright © 2010 Red Hat
*
* 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:
* Dave Airlie
*
*/
/** @file tex-srgb
*
* Check srgb texturing and EXT_texture_sRGB_decode
*/
#include "piglit-util.h"
int piglit_width = 128, piglit_height = 128;
int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
#define SIZE 128
// Convert an 8-bit sRGB value from non-linear space to a
// linear RGB value in [0, 1].
// Implemented with a 256-entry lookup table.
static float
nonlinear_to_linear(GLubyte cs8)
{
static GLfloat table[256];
static GLboolean tableReady = GL_FALSE;
if (!tableReady) {
// compute lookup table now
GLuint i;
for (i = 0; i < 256; i++) {
const GLfloat cs = i / 255.0;
if (cs <= 0.04045) {
table[i] = cs / 12.92;
}
else {
table[i] = pow((cs + 0.055) / 1.055, 2.4);
}
}
tableReady = GL_TRUE;
}
return table[cs8];
}
static void fill_level(int level, const GLfloat *color)
{
GLfloat *data;
int size = SIZE / (1 << level);
int i;
/* Update a square inside the texture to red */
data = malloc(size * size * 4 * sizeof(GLfloat));
for (i = 0; i < 4 * size * size; i += 4) {
data[i + 0] = color[0];
data[i + 1] = color[1];
data[i + 2] = color[2];
data[i + 3] = color[3];
}
glTexImage2D(GL_TEXTURE_2D, level, GL_SRGB8_ALPHA8, size, size, 0,
GL_RGBA, GL_FLOAT, data);
free(data);
}
static GLboolean
srgb_tex_test(int srgb_format)
{
GLboolean pass = GL_TRUE;
float green[] = {0, 0.3, 0.0, 0};
float expected_green[4];
float expected_srgb_green[4];
GLuint tex;
GLboolean have_decode;
have_decode = glutExtensionSupported("GL_EXT_texture_sRGB_decode");
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
fill_level(0, green);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
piglit_draw_rect_tex(0, 0, 20, 20, 0, 0, 1, 1);
if (have_decode) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT,
GL_SKIP_DECODE_EXT);
piglit_draw_rect_tex(20, 0, 20, 20, 0, 0, 1, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT,
GL_DECODE_EXT);
piglit_draw_rect_tex(40, 0, 20, 20, 0, 0, 1, 1);
}
memcpy(expected_green, green, sizeof(float) * 4);
memcpy(expected_srgb_green, green, sizeof(float) * 4);
expected_srgb_green[1] = nonlinear_to_linear(255.0*green[1]);
if (!piglit_probe_rect_rgb(0, 0, 20, 20, expected_srgb_green))
pass = GL_FALSE;
if (have_decode) {
if (!piglit_probe_rect_rgb(20, 0, 20, 20, expected_green))
pass = GL_FALSE;
if (!piglit_probe_rect_rgb(40, 0, 20, 20, expected_srgb_green))
pass = GL_FALSE;
}
glDeleteTextures(1, &tex);
glutSwapBuffers();
return pass;
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
pass = srgb_tex_test(0);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void reshape(int width, int height)
{
piglit_width = width;
piglit_height = height;
piglit_ortho_projection(width, height, GL_FALSE);
}
void
piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_EXT_texture_sRGB");
reshape(piglit_width, piglit_height);
}
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