tests/fbo/fbo-drawbuffers2-colormask.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file fbo-drawbuffers2-colormask.c
  29  *
  30  * Tests that individual color masks per render target with
  31  * EXT_draw_buffers2 works.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 int piglit_width = 128;
  37 int piglit_height = 128;
  38 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  39
  40 static GLuint
  41 attach_texture(int i)
  42 {
  43         GLuint tex;
  44
  45         glGenTextures(1, &tex);
  46         glBindTexture(GL_TEXTURE_2D, tex);
  47         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  48                      piglit_width, piglit_height, 0,
  49                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  50
  51         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  52         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  53
  54         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  55                                   GL_COLOR_ATTACHMENT0_EXT + i,
  56                                   GL_TEXTURE_2D,
  57                                   tex,
  58                                   0);
  59         assert(glGetError() == 0);
  60
  61         return tex;
  62 }
  63
  64 enum piglit_result
  65 piglit_display(void)
  66 {
  67         GLboolean pass = GL_TRUE;
  68         GLuint tex0, tex1, fb;
  69         GLenum status;
  70         int x, y;
  71         float white[] = {1, 1, 1, 1};
  72         float green[] = {0, 1, 0, 0};
  73         float blue[] = {0, 0, 1, 0};
  74         const GLenum attachments[] = {
  75                 GL_COLOR_ATTACHMENT0_EXT,
  76                 GL_COLOR_ATTACHMENT1_EXT,
  77         };
  78
  79         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  80
  81         glGenFramebuffersEXT(1, &fb);
  82         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  83
  84         tex0 = attach_texture(0);
  85         tex1 = attach_texture(1);
  86
  87         glDrawBuffersARB(2, attachments);
  88
  89         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  90         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  91                 fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
  92                 piglit_report_result(PIGLIT_SKIP);
  93         }
  94
  95         /* Clear to black */
  96         glClearColor(0.0, 0.0, 0.0, 0.0);
  97         glClear(GL_COLOR_BUFFER_BIT);
  98
  99         /* Mask only green in RT 0, blue in RT 1, then try to draw in white */
 100         glColorMaskIndexedEXT(0, GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
 101         glColorMaskIndexedEXT(1, GL_FALSE, GL_FALSE, GL_TRUE, GL_FALSE);
 102
 103         glColor4fv(white);
 104         piglit_draw_rect(0, 0, piglit_width, piglit_height);
 105
 106         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 107         glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
 108
 109         /* Draw the two textures to halves of the window. */
 110         glEnable(GL_TEXTURE_2D);
 111         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 112         glBindTexture(GL_TEXTURE_2D, tex0);
 113         piglit_draw_rect_tex(0, 0,
 114                              piglit_width / 2, piglit_height,
 115                              0, 0, 1, 1);
 116         glBindTexture(GL_TEXTURE_2D, tex1);
 117         piglit_draw_rect_tex(piglit_width / 2, 0,
 118                              piglit_width, piglit_height,
 119                              0, 0, 1, 1);
 120         glDisable(GL_TEXTURE_2D);
 121         glDeleteTextures(1, &tex0);
 122         glDeleteTextures(1, &tex1);
 123         glDeleteFramebuffersEXT(1, &fb);
 124
 125         for (y = 0; y < piglit_height; y++) {
 126                 for (x = 0; x < piglit_width; x++) {
 127                         float *expected;
 128                         if (x < piglit_width / 2)
 129                                 expected = green;
 130                         else
 131                                 expected = blue;
 132
 133                         pass = pass && piglit_probe_pixel_rgb(x, y, expected);
 134                 }
 135         }
 136
 137         glutSwapBuffers();
 138
 139         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 140 }
 141
 142 void
 143 piglit_init(int argc, char **argv)
 144 {
 145         GLint num;
 146
 147         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 148
 149         piglit_require_extension("GL_EXT_framebuffer_object");
 150         piglit_require_extension("GL_ARB_draw_buffers");
 151         piglit_require_extension("GL_EXT_draw_buffers2");
 152
 153         glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &num);
 154         if (num < 2)
 155                 piglit_report_result(PIGLIT_SKIP);
 156 }