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/*
* Copyright © 2013 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
* 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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 OpenGL scissor for polygon rendering.
* This is a replacement for the old glean scissor test.
*
* Brian Paul
* Feb 2013
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
static const GLubyte black[4] = { 0, 0, 0, 0 };
static const GLubyte white[4] = { 255, 255, 255, 255 };
static bool
color_equal(const GLubyte c1[4], const GLubyte c2[4])
{
return (c1[0] == c2[0] &&
c1[1] == c2[1] &&
c1[2] == c2[2] &&
c1[3] == c2[3]);
}
static bool
check_result(int x, int y, int w, int h, const GLubyte *image)
{
int i, j;
for (j = 0; j < piglit_height; j++) {
for (i = 0; i < piglit_width; i++) {
const GLubyte *p = image + (j * piglit_width + i) * 4;
if (i >= x && i < x + w &&
j >= y && j < y + h) {
/* inside the scissor rect */
if (!color_equal(p, white)) {
fprintf(stderr, "Expected white at (%d, %d),"
" found black\n", i, j);
return false;
}
}
else {
/* outside the scissor rect */
if (!color_equal(p, black)) {
fprintf(stderr, "Expected black at (%d, %d),"
" found white\n", i, j);
return false;
}
}
}
}
return true;
}
enum piglit_result
piglit_display(void)
{
GLubyte *image = malloc(piglit_width * piglit_height * 4);
int dx, dy;
int x, y, w, h;
bool pass = true;
/* compute position step */
dx = piglit_width / 8;
dy = piglit_height / 8;
/* compute scissor size */
w = piglit_width / 5;
h = piglit_height / 5;
glColor4ubv(white);
/* loop over scissor positions */
for (y = 0; y < piglit_height; y += dy) {
for (x = 0; x < piglit_width; x += dx) {
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
glScissor(x, y, w, h);
/* draw window-sized quad */
piglit_draw_rect(-1, -1, 2, 2);
glDisable(GL_SCISSOR_TEST);
glReadPixels(0, 0, piglit_width, piglit_height,
GL_RGBA, GL_UNSIGNED_BYTE, image);
piglit_present_results();
pass = check_result(x, y, w, h, image);
if (!pass)
goto end;
}
}
end:
free(image);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char**argv)
{
/* nothing */
}
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