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/*
* Copyright (c) 2011 Christoph Bumiller
*
* 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.
*/
/**
* @file
* Test for bugs with early depth testing and early depth update.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 128;
config.window_height = 128;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH;
PIGLIT_GL_TEST_CONFIG_END
GLint u_zval;
static const char *fpFragDepthText =
"uniform float zval; \n"
"void main() \n"
"{ \n"
" gl_FragColor = vec4(gl_Color.rgb, 1.0); \n"
" gl_FragDepth = zval; \n"
"} \n";
static const char *fpDiscardText =
"void main() \n"
"{ \n"
" if (gl_Color.r > 0.25) \n"
" discard; \n"
" gl_FragColor = vec4(gl_Color.rgb, 1.0); \n"
"} \n";
static const char *fpAlphaText =
"void main() \n"
"{ \n"
" gl_FragColor = vec4(gl_Color.rgb, 0.0); \n"
"} \n";
static GLuint shader[3];
static GLuint program[3];
static void quad(const GLfloat z, uint32_t colour)
{
glColor3ub(colour & 0xff, (colour >> 8) & 0xff, (colour >> 16) & 0xff);
glBegin(GL_QUADS);
glVertex3f(-1.0f, -1.0f, z);
glVertex3f(-1.0f, 1.0f, z);
glVertex3f( 1.0f, 1.0f, z);
glVertex3f( 1.0f, -1.0f, z);
glEnd();
}
static GLboolean
test_early_depth(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glDepthFunc(GL_LESS);
/* 1. (blue) depth should be adjusted to 0.8 by the FP */
glUseProgram(program[0]);
glUniform1f(u_zval, 0.8f);
quad(0.3, 0xff0000);
/* 2. (red) should be discarded, no depth value written */
glUseProgram(program[1]);
quad(0.2, 0x0000ff);
/* 3. (white) should be discarded by the alpha test, no depth written */
glUseProgram(program[2]);
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_GREATER, 0.5f);
quad(0.1, 0xffffff);
glDisable(GL_ALPHA_TEST);
/* 4. (green) should be drawn because depth is 0.8 and FragDepth is 0.5 */
glUseProgram(program[0]);
glUniform1f(u_zval, 0.5);
quad(0.9, 0x00ff00);
/* 5. (yellow) should be discarded because program sets depth to 0.9 */
glUniform1f(u_zval, 0.9);
quad(0.2, 0x00ffff);
{
const GLfloat color[4] = { 0.0f, 1.0f, 0.0f, 1.0f };
GLint pos[4];
/* use glRasterPos to determine where to read a sample pixel */
glRasterPos2f(0.0f, 0.0f);
glGetIntegerv(GL_CURRENT_RASTER_POSITION, pos);
if (!piglit_probe_pixel_rgba(pos[0], pos[1], color)) {
piglit_present_results();
return GL_FALSE;
}
}
piglit_present_results();
return GL_TRUE;
}
enum piglit_result
piglit_display(void)
{
if (!test_early_depth())
return PIGLIT_FAIL;
return PIGLIT_PASS;
}
void
piglit_init(int argc, char **argv)
{
int i;
piglit_require_gl_version(20);
shader[0] = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fpFragDepthText);
assert(shader[0]);
shader[1] = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fpDiscardText);
assert(shader[1]);
shader[2] = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fpAlphaText);
assert(shader[2]);
for (i = 0; i < 3; ++i)
program[i] = piglit_link_simple_program(shader[i], 0);
u_zval = glGetUniformLocation(program[0], "zval");
}
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