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/*
* Copyright (c) 2012 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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
* NON-INFRINGEMENT. IN NO EVENT SHALL VMWARE AND/OR THEIR SUPPLIERS
* 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 glGetTexImage for luminance formats.
* Brian Paul
* 8 Mar 2012
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
100 /*window_width*/,
100 /*window_height*/,
GLUT_RGBA | GLUT_DOUBLE)
static const char *TestName = "getteximage-luminance";
static float tolerance = 2.0 / 255.0;
static bool
rgba_equal(const float *c1, const float *c2)
{
return ((fabs(c1[0] - c2[0]) < tolerance) &&
(fabs(c1[1] - c2[1]) < tolerance) &&
(fabs(c1[2] - c2[2]) < tolerance) &&
(fabs(c1[3] - c2[3]) < tolerance));
}
static bool
lum_equal(const float *l1, const float *l2)
{
return fabs(*l1 - *l2) < tolerance;
}
/*
* Test reading back a luminance texture as luminance and RGBA.
*/
static bool
test_luminance(void)
{
static const GLfloat lumImage[2*2] = { 0.25, 0.25, 0.25, 0.25 };
static const GLfloat rgbaImage[4] = { 0.25, 0.0, 0.0, 1.0 };
GLuint tex;
GLfloat test[2*2*4];
/* create 2x2 GL_LUMINANCE texture */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 2, 2, 0,
GL_LUMINANCE, GL_FLOAT, lumImage);
/* Get and check luminance image */
glGetTexImage(GL_TEXTURE_2D, 0, GL_LUMINANCE, GL_FLOAT, test);
if (!lum_equal(lumImage, test)) {
printf("%s: glGetTexImage(GL_LUMINANCE as"
" GL_LUMINANCE) failed\n", TestName);
printf(" Expected %g Found %g\n", lumImage[0], test[0]);
return false;
}
/* Get and check rgba image */
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, &test);
if (!rgba_equal(rgbaImage, test)) {
printf("%s: glGetTexImage(GL_LUMINANCE as GL_RGBA) failed\n",
TestName);
printf(" Expected %g, %g, %g, %g Found %g, %g, %g, %g\n",
rgbaImage[0], rgbaImage[1], rgbaImage[2], rgbaImage[3],
test[0], test[1], test[2], test[3]);
return false;
}
return true;
}
/*
* Test reading back an RGBA texture as luminance.
*/
static bool
test_rgba(void)
{
static const GLfloat rgbaImage[4] = { 0.5, 0.25, 0.125, 1.0 };
static const GLfloat lumImage[1] = { 0.5 };
GLuint tex;
GLfloat test[2*2*4];
/* create 1x1 GL_RGBA texture */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0,
GL_RGBA, GL_FLOAT, rgbaImage);
/* Get and check luminance image */
glGetTexImage(GL_TEXTURE_2D, 0, GL_LUMINANCE, GL_FLOAT, test);
if (!lum_equal(lumImage, test)) {
printf("%s: glGetTexImage(GL_RGBA as GL_LUMINANCE) failed\n",
TestName);
printf(" Expected %g Found %g\n", lumImage[0], test[0]);
return false;
}
return true;
}
/*
* Test reading back a luminance texture via FBO + glReadPixels as RGBA.
*/
static bool
test_fbo_readpixels_lum_as_rgba(void)
{
static const GLfloat lumImage[2*2] = { 0.25, 0.25, 0.25, 0.25 };
static const GLfloat rgbaImage[4] = { 0.25, 0.0, 0.0, 1.0 };
GLuint tex, fbo;
GLfloat test[2*2*4];
GLenum status;
if (!piglit_is_extension_supported("GL_ARB_framebuffer_object"))
return true;
/* create 2x2 GL_LUMINANCE texture */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 2, 2, 0,
GL_LUMINANCE, GL_FLOAT, lumImage);
/* create an FBO to wrap the texture so we can read it back
* with glReadPixels
*/
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, tex, 0);
status = glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
/* can't test glReadPixels from a luminance fbo/texture */
if (!piglit_automatic) {
printf("Skipping FBO ReadPixels test\n");
}
return true;
}
/* get rgba image (only red should have the lum value) */
glReadPixels(0, 0, 1, 1, GL_RGBA, GL_FLOAT, test);
if (!rgba_equal(rgbaImage, test)) {
printf("%s: glReadPixels(GL_LUMINANCE as GL_RGBA) failed\n",
TestName);
printf(" Expected %g, %g, %g, %g Found %g, %g, %g, %g\n",
rgbaImage[0], rgbaImage[1], rgbaImage[2], rgbaImage[3],
test[0], test[1], test[2], test[3]);
return false;
}
return true;
}
/*
* Test reading back an RGBA texture via FBO + glReadPixels as luminance.
*/
static bool
test_fbo_readpixels_rgba_as_lum(void)
{
static const GLfloat rgbaImage[4] = { 0.5, 0.25, 0.125, 1.0 };
static const GLfloat lumImage[1] = { 0.5 + 0.25 + 0.125 };
GLuint tex, fbo;
GLfloat test[1];
GLenum status;
if (!piglit_is_extension_supported("GL_ARB_framebuffer_object"))
return true;
/* create 1x1 GL_RGBA texture */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0,
GL_RGBA, GL_FLOAT, rgbaImage);
/* create an FBO to wrap the texture so we can read it back
* with glReadPixels
*/
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, tex, 0);
status = glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
/* something failed with FBO setup, ignore it */
if (!piglit_automatic) {
printf("Skipping FBO ReadPixels test\n");
}
return true;
}
/* get luminance image, should be sum of RGB values */
glReadPixels(0, 0, 1, 1, GL_LUMINANCE, GL_FLOAT, test);
if (!lum_equal(lumImage, test)) {
printf("%s: glReadPixels(GL_RGBA as GL_LUMINANCE) failed\n",
TestName);
printf(" Expected %g Found %g\n", lumImage[0], test[0]);
return false;
}
return true;
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
pass = test_luminance() && pass;
pass = test_rgba() && pass;
pass = test_fbo_readpixels_lum_as_rgba() && pass;
pass = test_fbo_readpixels_rgba_as_lum() && pass;
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
glewInit();
}
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