tests/fbo/fbo-blit.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  *    Brian Paul
  26  */
  27
  28 /** @file fbo-blit.c
  29  *
  30  * Tests EXT_framebuffer_blit with various combinations of window system and
  31  * FBO objects.  Because FBOs are generally stored inverted relative to
  32  * window system frambuffers, this could catch flipping failures in blit paths.
  33  *
  34  * See also fbo-readdrawpix.c and fbo-copypix.c
  35  */
  36
  37 #include "piglit-util.h"
  38
  39 int piglit_width = 150;
  40 int piglit_height = 150;
  41 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  42 #define PAD 10
  43 #define SIZE 20
  44
  45 /* size of texture/renderbuffer (power of two) */
  46 #define FBO_SIZE 64
  47
  48
  49 static GLuint
  50 make_fbo(int w, int h)
  51 {
  52         GLuint tex;
  53         GLuint fb;
  54         GLenum status;
  55
  56         glGenFramebuffersEXT(1, &fb);
  57         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  58
  59         glGenTextures(1, &tex);
  60         glBindTexture(GL_TEXTURE_2D, tex);
  61         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  62                      w, h, 0,
  63                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  64
  65         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  66         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  67
  68         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  69                                   GL_COLOR_ATTACHMENT0_EXT,
  70                                   GL_TEXTURE_2D,
  71                                   tex,
  72                                   0);
  73         assert(glGetError() == 0);
  74
  75         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  76         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  77                 fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
  78                 piglit_report_result(PIGLIT_SKIP);
  79         }
  80
  81         return fb;
  82 }
  83
  84 static void
  85 draw_color_rect(int x, int y, int w, int h)
  86 {
  87         int x1 = x;
  88         int x2 = x + w / 2;
  89         int y1 = y;
  90         int y2 = y + h / 2;
  91
  92         glColor4f(1.0, 0.0, 0.0, 0.0);
  93         piglit_draw_rect(x1, y1, w / 2, h / 2);
  94         glColor4f(0.0, 1.0, 0.0, 0.0);
  95         piglit_draw_rect(x2, y1, w / 2, h / 2);
  96         glColor4f(0.0, 0.0, 1.0, 0.0);
  97         piglit_draw_rect(x1, y2, w / 2, h / 2);
  98         glColor4f(1.0, 1.0, 1.0, 0.0);
  99         piglit_draw_rect(x2, y2, w / 2, h / 2);
 100 }
 101
 102 static GLboolean
 103 verify_color_rect(int start_x, int start_y, int w, int h)
 104 {
 105         float red[] =   {1, 0, 0, 0};
 106         float green[] = {0, 1, 0, 0};
 107         float blue[] =  {0, 0, 1, 0};
 108         float white[] = {1, 1, 1, 0};
 109         int x, y;
 110
 111         for (y = 0; y < h; y++) {
 112                 for (x = 0; x < w; x++) {
 113                         float *expected;
 114
 115                         if ((y < h / 2) && (x < w / 2))
 116                                 expected = red;
 117                         else if (y < h / 2)
 118                                 expected = green;
 119                         else if (x < w / 2)
 120                                 expected = blue;
 121                         else
 122                                 expected = white;
 123
 124                         if (!piglit_probe_pixel_rgb(start_x + x, start_y + y,
 125                                                     expected))
 126                                 return GL_FALSE;
 127                 }
 128         }
 129
 130         return GL_TRUE;
 131 }
 132
 133
 134 static void
 135 copy(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 136      GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
 137 {
 138         glBlitFramebufferEXT(srcX0, srcY0, srcX1, srcY1,
 139                              dstX0, dstY0, dstX1, dstY1,
 140                              GL_COLOR_BUFFER_BIT, GL_NEAREST);
 141 }
 142
 143
 144 static GLboolean
 145 run_test(void)
 146 {
 147         GLboolean pass = GL_TRUE;
 148         GLuint fbo;
 149         int fbo_width = FBO_SIZE;
 150         int fbo_height = FBO_SIZE;
 151         int x0 = PAD;
 152         int y0 = PAD;
 153         int y1 = PAD * 2 + SIZE;
 154         int y2 = PAD * 3 + SIZE * 2;
 155
 156         glViewport(0, 0, piglit_width, piglit_height);
 157         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 158
 159         glClearColor(0.5, 0.5, 0.5, 0.5);
 160         glClear(GL_COLOR_BUFFER_BIT);
 161
 162         /* Draw the color rect in the window system window */
 163         draw_color_rect(x0, y0, SIZE, SIZE);
 164
 165         fbo = make_fbo(fbo_width, fbo_height);
 166
 167         glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, fbo);
 168         glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
 169         glViewport(0, 0, fbo_width, fbo_height);
 170         piglit_ortho_projection(fbo_width, fbo_height, GL_FALSE);
 171         glClearColor(1.0, 0.0, 1.0, 0.0);
 172         glClear(GL_COLOR_BUFFER_BIT);
 173
 174         /* Draw the color rect in the FBO */
 175         draw_color_rect(x0, y0, SIZE, SIZE);
 176
 177         /* Now that we have correct samples, blit things around.
 178          * FBO(bottom) -> WIN(middle)
 179          */
 180         glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
 181         glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, fbo);
 182         copy(x0, y0, x0 + SIZE, y0 + SIZE,
 183              x0, y1, x0 + SIZE, y1 + SIZE);
 184
 185         /* WIN(bottom) -> FBO(middle) */
 186         glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, fbo);
 187         glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
 188         copy(x0, y0, x0 + SIZE, y0 + SIZE,
 189              x0, y1, x0 + SIZE, y1 + SIZE);
 190
 191         /* FBO(middle) -> WIN(top) back to verify WIN -> FBO */
 192         glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
 193         glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, fbo);
 194         copy(x0, y1, x0 + SIZE, y1 + SIZE,
 195              x0, y2, x0 + SIZE, y2 + SIZE);
 196
 197         glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
 198         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 199
 200         pass = verify_color_rect(PAD, y0, SIZE, SIZE) && pass;
 201         pass = verify_color_rect(PAD, y1, SIZE, SIZE) && pass;
 202         pass = verify_color_rect(PAD, y2, SIZE, SIZE) && pass;
 203         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
 204         pass = verify_color_rect(PAD, y0, SIZE, SIZE) && pass;
 205         pass = verify_color_rect(PAD, y1, SIZE, SIZE) && pass;
 206         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 207
 208         glutSwapBuffers();
 209
 210         return pass;
 211 }
 212
 213
 214 enum piglit_result
 215 piglit_display(void)
 216 {
 217         GLboolean pass = run_test();
 218
 219         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 220 }
 221
 222
 223 void
 224 piglit_init(int argc, char **argv)
 225 {
 226         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 227
 228         piglit_require_extension("GL_EXT_framebuffer_object");
 229         piglit_require_extension("GL_EXT_framebuffer_blit");
 230 }