tests/general/blendsquare.c

   1 /*
   2  * (C) Copyright IBM Corporation 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file blendsquare.c
  27  *
  28  * Simple test of GL_NV_blend_square functionality.  Four squares are drawn
  29  * with different blending modes, but all should be rendered with the same
  30  * final color.
  31  *
  32  * \author Ian Romanick <idr@us.ibm.com>
  33  */
  34
  35 #include "piglit-util.h"
  36
  37 int piglit_width = 400;
  38 int piglit_height = 200;
  39 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  40 static const GLfloat Near = 5.0, Far = 25.0;
  41
  42 enum piglit_result
  43 piglit_display(void)
  44 {
  45         GLboolean pass = GL_TRUE;
  46         int w = (piglit_width - 50) / 4;
  47         int h = piglit_height - 20;
  48         int start_x = 10;
  49         int next_x = 10 + w;
  50         float expected[4] = {0.25, 0.25, 0.25, 0.25};
  51
  52         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  53
  54         glClearColor(0.2, 0.2, 0.8, 0);
  55         glClear(GL_COLOR_BUFFER_BIT);
  56
  57         glBlendFunc(GL_ONE, GL_ZERO);
  58         glColor3f(0.5 * 0.5, 0.5 * 0.5, 0.5 * 0.5);
  59         piglit_draw_rect(start_x + next_x * 0, 10, w, h);
  60
  61         glBlendFunc(GL_ONE, GL_ZERO);
  62         glColor3f(0.5, 0.5, 0.5);
  63         piglit_draw_rect(start_x + next_x * 1, 10, w, h);
  64         glBlendFunc(GL_DST_COLOR, GL_ZERO);
  65         piglit_draw_rect(start_x + next_x * 1, 10, w, h);
  66
  67         glBlendFunc(GL_SRC_COLOR, GL_ZERO);
  68         piglit_draw_rect(start_x + next_x * 2, 10, w, h);
  69
  70         glBlendFunc(GL_ONE, GL_ZERO);
  71         piglit_draw_rect(start_x + next_x * 3, 10, w, h);
  72         glBlendFunc(GL_ZERO, GL_DST_COLOR);
  73         piglit_draw_rect(start_x + next_x * 3, 10, w, h);
  74
  75         pass = piglit_probe_pixel_rgb(15 + next_x * 0, piglit_height / 2,
  76                                       expected) && pass;
  77         pass = piglit_probe_pixel_rgb(15 + next_x * 1, piglit_height / 2,
  78                                       expected) && pass;
  79         pass = piglit_probe_pixel_rgb(15 + next_x * 2, piglit_height / 2,
  80                                       expected) && pass;
  81         pass = piglit_probe_pixel_rgb(15 + next_x * 3, piglit_height / 2,
  82                                       expected) && pass;
  83
  84         glutSwapBuffers();
  85
  86         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  87 }
  88
  89 void
  90 piglit_init(int argc, char **argv)
  91 {
  92         if (!GLEW_VERSION_1_4 && !GLEW_NV_blend_square) {
  93                 printf("Sorry, this program requires either OpenGL 1.4 or "
  94                        "GL_NV_blend_square\n");
  95                 piglit_report_result(PIGLIT_SKIP);
  96         }
  97
  98         printf("\nAll 4 quads should be the same color.  "
  99                "The two on the left are drawn\n"
 100                "without NV_blend_square functionality, and "
 101                "the two on the right are drawn\n"
 102                "with NV_blend_square functionality.  If the "
 103                "two on the left are dark, but\n"
 104                "the two on the right are not, then "
 105                "NV_blend_square is broken.\n");
 106         glEnable(GL_BLEND);
 107         glBlendEquation(GL_FUNC_ADD);
 108 }