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/*
* Port of Glean maskedClear test to piglit. Original copyright follows.
*
* Copyright (C) 1999 Allen Akin All Rights Reserved.
*
* 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 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 ALLEN AKIN 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 color/depth/stencil masking with glClear.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = (PIGLIT_GL_VISUAL_RGB |
PIGLIT_GL_VISUAL_DEPTH |
PIGLIT_GL_VISUAL_STENCIL |
PIGLIT_GL_VISUAL_DOUBLE);
config.requires_displayed_window = true;
PIGLIT_GL_TEST_CONFIG_END
static void
failRGB(GLint chan, GLfloat expected,
GLfloat actual, GLenum buffer)
{
static const char *chanNames[] = { "Red", "Green", "Blue", "Alpha" };
GLboolean mask[4];
glGetBooleanv(GL_COLOR_WRITEMASK, mask);
fprintf(stderr, "masked-clear: %s is %f, expected %f in %s\n",
chanNames[chan], actual, expected,
piglit_get_gl_enum_name(buffer));
fprintf(stderr, "\tGL_COLOR_WRITEMASK = (%s, %s, %s, %s)\n",
(mask[0] ? "GL_TRUE" : "GL_FALSE"),
(mask[1] ? "GL_TRUE" : "GL_FALSE"),
(mask[2] ? "GL_TRUE" : "GL_FALSE"),
(mask[3] ? "GL_TRUE" : "GL_FALSE"));
}
static void
failZ(GLfloat expected, GLfloat actual)
{
GLboolean mask;
glGetBooleanv(GL_DEPTH_WRITEMASK, &mask);
fprintf(stderr, "masked-clear: depth buffer value is %f, expected %f\n",
actual, expected);
fprintf(stderr, "\tGL_DEPTH_WRITEMASK = %s\n",
mask ? "GL_TRUE" : "GL_FALSE");
}
static void
failStencil(GLuint expected, GLuint actual)
{
GLint mask;
glGetIntegerv(GL_STENCIL_WRITEMASK, &mask);
fprintf(stderr, "masked-clear: stencil buffer value is %d, expected %d\n",
actual, expected);
fprintf(stderr, "\tGL_STENCIL_WRITEMASK = 0x%x\n", mask);
}
static bool
test_color_masking(GLenum buffer)
{
GLint a;
int chan, comp, numChannels;
bool passed = true;
assert(buffer == GL_FRONT || buffer == GL_BACK);
glReadBuffer(buffer);
glDrawBuffer(buffer);
glGetIntegerv(GL_ALPHA_BITS, &a);
numChannels = a ? 4 : 3;
for (chan = 0; chan < numChannels && passed; chan++) {
GLfloat pixel[4];
/* clear to black */
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* select one channel to "clear" to 1.0 */
glColorMask(chan == 0, chan == 1, chan == 2, chan == 3);
/* try to clear surface to white */
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
/* read 1x1 image at (x,y)=(4,4) */
glReadPixels(4, 4, 1, 1, GL_RGBA, GL_FLOAT, pixel);
if (!piglit_automatic)
piglit_present_results();
/* test results */
for (comp = 0; comp < numChannels && passed; comp++) {
if (comp == chan) {
/* component should be 1.0 */
if (pixel[comp] < 0.5) {
passed = false;
failRGB(comp, 1.0,
pixel[comp], buffer);
}
} else {
/* component should be 0.0 */
if (pixel[comp] > 0.5) {
passed = false;
failRGB(comp, 0.0,
pixel[comp], buffer);
}
}
}
}
return passed;
}
static bool
test_depth_masking(void)
{
GLfloat depth;
bool passed = true;
/* clear depth buffer to zero */
glDepthMask(GL_TRUE);
glClearDepth(0.0);
glClear(GL_DEPTH_BUFFER_BIT);
/* disable Z writes, try to clear to one */
glDepthMask(GL_FALSE);
glClearDepth(1.0);
glClear(GL_DEPTH_BUFFER_BIT);
/* read 1x1 image at (x,y)=(4,4); */
glReadPixels(4, 4, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth);
/* test result */
if (depth != 0.0) {
passed = false;
failZ(0.0, depth);
}
return passed;
}
static bool
test_stencil_masking(void)
{
GLint stencilBits;
int bit;
bool passed = true;
glGetIntegerv(GL_STENCIL_BITS, &stencilBits);
/* We just run <stencilBits> tests rather than 2^stencilBits */
for (bit = 0; bit < stencilBits; bit++) {
GLuint stencil;
/* clear to 0 */
glStencilMask(~0);
glClearStencil(0);
glClear(GL_STENCIL_BUFFER_BIT);
/* select one bit to "clear" to 1 */
glStencilMask(1 << bit);
/* try to clear stencil buffer to ~0 */
glClearStencil(~0);
glClear(GL_STENCIL_BUFFER_BIT);
/* read 1x1 image at (x,y)=(4,4) */
glReadPixels(4, 4, 1, 1,
GL_STENCIL_INDEX, GL_UNSIGNED_INT, &stencil);
/* test results */
if (stencil != (1U << bit)) {
passed = false;
failStencil(1 << bit, stencil);
}
}
return passed;
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
pass = test_color_masking(GL_FRONT) && pass;
pass = test_color_masking(GL_BACK) && pass;
pass = test_depth_masking() && pass;
pass = test_stencil_masking() && pass;
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
/* nothing */
}
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