tests/fbo/fbo-1d.c

   1 /*
   2  * Copyright © 2009 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-1d.c
  29  *
  30  * Tests that rendering to a 1D texture and then drawing it to the framebuffer
  31  * succeeds.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 #define BUF_WIDTH 32
  37 int piglit_width = 50;
  38 int piglit_height = 20;
  39 int piglit_window_mode = GLUT_DOUBLE | GLUT_DEPTH;
  40
  41 static int
  42 create_1d_fbo(void)
  43 {
  44         GLuint tex, fb;
  45         GLenum status;
  46
  47         glGenTextures(1, &tex);
  48         glBindTexture(GL_TEXTURE_1D, tex);
  49
  50         glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA,
  51                      BUF_WIDTH,
  52                      0,
  53                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  54         assert(glGetError() == 0);
  55
  56         glGenFramebuffersEXT(1, &fb);
  57         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  58
  59         glFramebufferTexture1DEXT(GL_FRAMEBUFFER_EXT,
  60                                   GL_COLOR_ATTACHMENT0_EXT,
  61                                   GL_TEXTURE_1D,
  62                                   tex,
  63                                   0);
  64
  65         assert(glGetError() == 0);
  66
  67         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  68         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  69                 fprintf(stderr, "FBO incomplete\n");
  70                 goto done;
  71         }
  72
  73         glViewport(0, 0, BUF_WIDTH, 1);
  74         piglit_ortho_projection(BUF_WIDTH, 1, GL_FALSE);
  75
  76         /* left side: red */
  77         glColor4f(1.0, 0.0, 0.0, 0.0);
  78         piglit_draw_rect(0, 0, BUF_WIDTH / 2, 1);
  79
  80         /* right side: green */
  81         glColor4f(0.0, 1.0, 0.0, 0.0);
  82         piglit_draw_rect(BUF_WIDTH / 2, 0, BUF_WIDTH, 1);
  83
  84 done:
  85         glDeleteFramebuffersEXT(1, &fb);
  86
  87         return tex;
  88 }
  89
  90 static void
  91 draw_fbo_1d(int x, int y)
  92 {
  93         glViewport(0, 0, piglit_width, piglit_height);
  94         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  95
  96         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
  97
  98         glEnable(GL_TEXTURE_1D);
  99         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 100         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 101         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 102         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 103         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 104         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 105
 106         piglit_draw_rect_tex(x, y, BUF_WIDTH, 1,
 107                              0, 0, 1, 1);
 108 }
 109
 110 enum piglit_result
 111 piglit_display(void)
 112 {
 113         GLboolean pass = GL_TRUE;
 114         float red[] = {1,0,0,0};
 115         float green[] = {0,1,0,0};
 116         float *expected;
 117         int x;
 118         GLuint tex;
 119
 120         glClearColor(1.0, 1.0, 1.0, 1.0);
 121         glClear(GL_COLOR_BUFFER_BIT);
 122
 123         tex = create_1d_fbo();
 124
 125         draw_fbo_1d(10, 10);
 126
 127         for (x = 0; x < BUF_WIDTH; x++) {
 128                 if (x < BUF_WIDTH / 2)
 129                         expected = red;
 130                 else
 131                         expected = green;
 132
 133                 pass &= piglit_probe_pixel_rgb(10 + x, 10, expected);
 134         }
 135
 136         glDeleteTextures(1, &tex);
 137
 138         glutSwapBuffers();
 139
 140         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 141 }
 142
 143 void piglit_init(int argc, char **argv)
 144 {
 145         piglit_require_extension("GL_EXT_framebuffer_object");
 146 }