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/*
* (C) Copyright IBM Corporation 2004
* 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
* 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
* VA LINUX SYSTEM, IBM 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 stencil_wrap.c
*
* Simple test of GL_EXT_stencil_wrap functionality. Four squares are drawn
* with different stencil modes, but all should be rendered with the same
* final color.
*
* \author Ian Romanick <idr@us.ibm.com>
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 550;
config.window_height = 200;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
GLint max_stencil;
GLint stencil_bits;
unsigned i;
GLboolean pass = GL_TRUE;
float expected[4] = {0.5, 0.5, 0.5, 0.5};
int w = piglit_width / (5 * 2 + 1);
int h = w;
int start_y = (piglit_height - h) / 2;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glGetIntegerv(GL_STENCIL_BITS, & stencil_bits);
max_stencil = (1U << stencil_bits) - 1;
printf("Stencil bits = %u, maximum stencil value = 0x%08x\n",
stencil_bits, max_stencil);
glClearStencil(0);
glClearColor(0.2, 0.2, 0.8, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT);
/* This is the "reference" square.
*/
glDisable(GL_STENCIL_TEST);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 1, start_y, w, h);
glEnable(GL_STENCIL_TEST);
/* Draw the first two squares using the two non-wrap (i.e., saturate)
* modes.
*/
glStencilFunc(GL_ALWAYS, 0, ~0);
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
piglit_draw_rect(w * 3, start_y, w, h);
}
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 3, start_y, w, h);
glStencilFunc(GL_ALWAYS, 0, ~0);
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
piglit_draw_rect(w * 5, start_y, w, h);
}
glStencilFunc(GL_EQUAL, 0, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 5, start_y, w, h);
/* Draw the last two squares using the two wrap modes.
*/
glStencilFunc(GL_ALWAYS, 0, ~0);
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP);
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
piglit_draw_rect(w * 7, start_y, w, h);
}
glStencilFunc(GL_EQUAL, 4, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 7, start_y, w, h);
glStencilFunc(GL_ALWAYS, 0, ~0);
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP);
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < 5 ; i++) {
piglit_draw_rect(w * 9, start_y, w, h);
}
glStencilFunc(GL_EQUAL, (max_stencil - 4), ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 9, start_y, w, h);
pass = piglit_probe_pixel_rgb(w * 1.5, piglit_height / 2, expected) && pass;
pass = piglit_probe_pixel_rgb(w * 3.5, piglit_height / 2, expected) && pass;
pass = piglit_probe_pixel_rgb(w * 5.5, piglit_height / 2, expected) && pass;
pass = piglit_probe_pixel_rgb(w * 7.5, piglit_height / 2, expected) && pass;
pass = piglit_probe_pixel_rgb(w * 9.5, piglit_height / 2, expected) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
if (!piglit_is_extension_supported("GL_EXT_stencil_wrap") && piglit_get_gl_version() < 14) {
printf("Sorry, this program requires either "
"GL_EXT_stencil_wrap or OpenGL 1.4.\n");
piglit_report_result(PIGLIT_SKIP);
}
printf("\nAll 5 squares should be the same color.\n");
glEnable(GL_BLEND);
}
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