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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 blendminmax.c
*
* Simple test of GL_EXT_blend_minmax functionality. Four squares are drawn
* with different blending 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 = 400;
config.window_height = 200;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int w = (piglit_width - 50) / 4;
int h = piglit_height - 20;
int start_x = 10;
int next_x = 10 + w;
float expected[4] = {0.5, 0.5, 0.5, 0.5};
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glClearColor(0.2, 0.2, 0.8, 0);
glClear(GL_COLOR_BUFFER_BIT);
/* This is the "reference" square.
*/
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_ONE, GL_ZERO);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(start_x + next_x * 0, 10, w, h);
/* GL_MIN and GL_MAX are supposed to ignore the blend function
* setting. To test that, we set the blend function to
* GL_ZERO for both color and alpha each time GL_MIN or GL_MAX
* is used.
*
* Apple ships an extension called
* GL_ATI_blend_weighted_minmax (supported on Mac OS X 10.2
* and later). I believe the difference with that extension
* is that it uses the blend function. However, I have no
* idea what the enums are for it. The extension is listed at
* Apple's developer site, but there is no documentation.
*
* http://developer.apple.com/opengl/extensions.html
*/
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_ONE, GL_ZERO);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(start_x + next_x * 1, 10, w, h);
glBlendEquation(GL_MAX);
glBlendFunc(GL_ZERO, GL_ZERO);
glColor3f(0.2, 0.2, 0.2);
piglit_draw_rect(start_x + next_x * 1, 10, w, h);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_ONE, GL_ZERO);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(start_x + next_x * 2, 10, w, h);
glBlendEquation(GL_MIN);
glBlendFunc(GL_ZERO, GL_ZERO);
glColor3f(0.8, 0.8, 0.8);
piglit_draw_rect(start_x + next_x * 2, 10, w, h);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_ONE, GL_ZERO);
glColor3f(0.8, 0.8, 0.8);
piglit_draw_rect(start_x + next_x * 3, 10, w, h);
glBlendEquation(GL_MIN);
glBlendFunc(GL_ZERO, GL_ZERO);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(start_x + next_x * 3, 10, w, h);
pass = piglit_probe_pixel_rgb(15 + next_x * 0, piglit_height / 2,
expected) && pass;
pass = piglit_probe_pixel_rgb(15 + next_x * 1, piglit_height / 2,
expected) && pass;
pass = piglit_probe_pixel_rgb(15 + next_x * 2, piglit_height / 2,
expected) && pass;
pass = piglit_probe_pixel_rgb(15 + next_x * 3, 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_ARB_imaging") && !piglit_is_extension_supported("GL_EXT_blend_minmax")) {
printf("Sorry, this program requires either GL_ARB_imaging or "
"GL_EXT_blend_minmax.\n");
piglit_report_result(PIGLIT_SKIP);
}
piglit_require_gl_version(14);
printf("\nAll 4 quads should be the same color.\n");
glEnable(GL_BLEND);
}
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