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/*
* Copyright © 2010 Intel Corporation
*
* 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.
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*
*/
/** @file glsl-vs-point-size.c
*
* Tests whether a vertex shader can change the point size by writing
* to gl_PointSize.
*
* Bug #27250
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
32 /*window_width*/,
32 /*window_height*/,
GLUT_RGB | GLUT_DOUBLE)
static GLint prog;
static const float white[4] = {1, 1, 1, 1};
static const float black[4] = {0, 0, 0, 0};
#define POINT_SIZE 16
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
float vert[2] = { piglit_width / 2, piglit_height / 2 };
/* Clear the window to black */
glClear(GL_COLOR_BUFFER_BIT);
/* Draw a single white point at the centre of the window. The
vertex shader should make this larger */
glColor3fv(white);
glVertexPointer(2, GL_FLOAT, 0, vert);
glEnableClientState(GL_VERTEX_ARRAY);
glDrawArrays(GL_POINTS, 0, 1);
glDisableClientState(GL_VERTEX_ARRAY);
/* Verify that the point is large by looking at some corner pixels */
pass &= piglit_probe_pixel_rgb(piglit_width / 2 - POINT_SIZE / 2 + 1,
piglit_height / 2 - POINT_SIZE / 2 + 1,
white);
pass &= piglit_probe_pixel_rgb(piglit_width / 2 + POINT_SIZE / 2 - 1,
piglit_height / 2 + POINT_SIZE / 2 - 1,
white);
/* Sanity check that the corners of the window aren't filled */
pass &= piglit_probe_pixel_rgb(0, 0, black);
pass &= piglit_probe_pixel_rgb(piglit_width - 1, piglit_height - 1,
black);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
GLint vs;
GLint point_size_range[2];
if (piglit_get_gl_version() < 20) {
printf("Requires OpenGL 2.0\n");
piglit_report_result(PIGLIT_SKIP);
}
/* If the driver doesn't claim to support the point size the
shader is going to set then we should skip the test */
glGetIntegerv(GL_ALIASED_POINT_SIZE_RANGE, point_size_range);
if (POINT_SIZE < point_size_range[0] ||
POINT_SIZE > point_size_range[1]) {
printf("Point size %i not supported\n", POINT_SIZE);
piglit_report_result(PIGLIT_SKIP);
}
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glClearColor(0.0, 0.0, 0.0, 1.0);
vs = piglit_compile_shader(GL_VERTEX_SHADER,
"shaders/glsl-vs-point-size.vert");
prog = piglit_link_simple_program(vs, 0);
glUseProgram(prog);
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
}
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