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/*
* Copyright (c) 2015 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.
*/
/*
* Test texture upload with scale and bias pixel transfer options
*
* Iago Toral Quiroga <itoral@igalia.com>
* Feb 13, 2015
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
static const GLfloat colors[4] = { 0.5, 0.25, 0.1, 0.5 };
static const GLfloat scale[4] = { 2.0, 3.0, 1.0, 1.0 };
static const GLfloat bias[4] = { -0.25, 0.0, 0.4, 0.0 };
static GLuint
create_texture()
{
GLuint tex, size, i;
GLfloat *image;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
/* Upload texture color data and apply a bias and scale
*/
glPixelTransferf(GL_RED_SCALE, scale[0]);
glPixelTransferf(GL_RED_BIAS, bias[0]);
glPixelTransferf(GL_GREEN_SCALE, scale[1]);
glPixelTransferf(GL_GREEN_BIAS, bias[1]);
glPixelTransferf(GL_BLUE_SCALE, scale[2]);
glPixelTransferf(GL_BLUE_BIAS, bias[2]);
glPixelTransferf(GL_ALPHA_SCALE, scale[3]);
glPixelTransferf(GL_ALPHA_BIAS, bias[3]);
size = 64;
image = malloc(size * size * 4 * sizeof(GLfloat));
for (i = 0; i < size * size; i++) {
image[i*4+0] = colors[0];
image[i*4+1] = colors[1];
image[i*4+2] = colors[2];
image[i*4+3] = colors[3];
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
size, size, 0, GL_RGBA, GL_FLOAT, image);
/* Reset pixel transfer to defaults */
glPixelTransferf(GL_RED_SCALE, 1.0);
glPixelTransferf(GL_RED_BIAS, 0.0);
glPixelTransferf(GL_GREEN_SCALE, 1.0);
glPixelTransferf(GL_GREEN_BIAS, 0.0);
glPixelTransferf(GL_BLUE_SCALE, 1.0);
glPixelTransferf(GL_BLUE_BIAS, 0.0);
glPixelTransferf(GL_ALPHA_SCALE, 1.0);
glPixelTransferf(GL_ALPHA_BIAS, 0.0);
free(image);
return tex;
}
enum piglit_result
piglit_display(void)
{
GLuint tex;
GLboolean pass;
GLfloat expected[4];
int i;
/* Create a texture and upload color data with scale and bias options */
glEnable(GL_TEXTURE_2D);
tex = create_texture();
/* Render with our texture */
glClear(GL_COLOR_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, tex);
piglit_draw_rect_tex(0, 0, piglit_width, piglit_height,
0.0, 0.0, 1.0, 1.0);
/* Compute expected color result after applying scale and bias.
* Read back pixels from the framebuffer and check that they have scale
* and bias applied.
*/
for (i = 0; i < 4; i++)
expected[i] = colors[i] * scale[i] + bias[i];
pass = piglit_probe_pixel_rgba(piglit_width/2, piglit_height/2, expected);
glDeleteTextures(1, &tex);
glDisable(GL_TEXTURE_2D);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glClearColor(0.0, 0.0, 0.0, 1.0);
}
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