tests/texturing/gen-nonzero-unit.c

   1 /*
   2  * Copyright © 2008, 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  *    Chris Lord <chris@openedhand.com>
  25  *    Eric Anholt <eric@anholt.net>
  26  *    Ian Romanick <ian.d.romanick@intel.com>
  27  *
  28  */
  29
  30 /** @file gen-nonzero-unit.c
  31  *
  32  * Tests that:
  33  * - Only uses textures bound to texture unit 1.  This seems to be the source
  34  *   of bugzilla #24219.
  35  * - The full mipmap tree is generated when level 0 is set in a new
  36  *   texture object.
  37  * - Changing GL_GENERATE_MIPMAP state flushes previous vertices.
  38  * - The full mipmap tree is regenerated when level 0 is updated in an
  39  *   existing texture.
  40  */
  41
  42 #include "piglit-util.h"
  43
  44 int piglit_width = 512, piglit_height = 512;
  45 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  46
  47 static PFNGLACTIVETEXTUREPROC ActiveTexture = NULL;
  48
  49 #define SIZE 128
  50
  51 static void display_mipmaps(int start_x, int start_y)
  52 {
  53         int i;
  54
  55         /* Disply all the mipmap levels */
  56         for (i = SIZE; i > 0; i /= 2) {
  57                 glBegin(GL_QUADS);
  58                 glTexCoord2f(0.0, 0.0); glVertex2f(start_x + 0, start_y + 0);
  59                 glTexCoord2f(1.0, 0.0); glVertex2f(start_x + i, start_y + 0);
  60                 glTexCoord2f(1.0, 1.0); glVertex2f(start_x + i, start_y + i);
  61                 glTexCoord2f(0.0, 1.0); glVertex2f(start_x + 0, start_y + i);
  62                 glEnd();
  63
  64                 start_x += i;
  65         }
  66 }
  67
  68 static void fill_level(int level, const GLfloat *color)
  69 {
  70         GLfloat *data;
  71         int size = SIZE / (1 << level);
  72         int i;
  73
  74         /* Update a square inside the texture to red */
  75         data = malloc(size * size * 4 * sizeof(GLfloat));
  76         for (i = 0; i < 4 * size * size; i += 4) {
  77                 data[i + 0] = color[0];
  78                 data[i + 1] = color[1];
  79                 data[i + 2] = color[2];
  80                 data[i + 3] = color[3];
  81         }
  82         glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, size, size, 0,
  83                      GL_RGBA, GL_FLOAT, data);
  84         free(data);
  85 }
  86
  87 static GLboolean check_resulting_mipmaps(int x, int y, const GLfloat *color)
  88 {
  89         GLboolean pass = GL_TRUE;
  90         int i;
  91
  92         for (i = SIZE; i > 4; i /= 2) {
  93                 pass = pass && piglit_probe_pixel_rgb(x + i / 2, y + i / 2,
  94                                                       color);
  95                 x += i;
  96         }
  97
  98         return pass;
  99 }
 100
 101 enum piglit_result
 102 piglit_display(void)
 103 {
 104         GLboolean pass = GL_TRUE;
 105         const GLfloat red[4] = {1.0, 0.0, 0.0, 0.0};
 106         const GLfloat blue[4] = {0.0, 0.0, 1.0, 0.0};
 107         GLuint textures[3];
 108         int i;
 109
 110         glClearColor(0, 0, 0, 0);
 111         glClear(GL_COLOR_BUFFER_BIT);
 112
 113         glGenTextures(3, textures);
 114
 115         ActiveTexture(GL_TEXTURE0);
 116         glDisable(GL_TEXTURE_2D);
 117         glBindTexture(GL_TEXTURE_2D, textures[0]);
 118         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0,
 119                      GL_RGBA, GL_FLOAT, NULL);
 120
 121         ActiveTexture(GL_TEXTURE1);
 122         glEnable(GL_TEXTURE_2D);
 123
 124         /* Set up a texture object with mipmap generation */
 125         glBindTexture(GL_TEXTURE_2D, textures[1]);
 126
 127         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 128         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 129         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 130         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 131                         GL_LINEAR_MIPMAP_NEAREST);
 132         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 133
 134         /* Set the first level of the new texture to red and display. */
 135         fill_level(0, red);
 136         display_mipmaps(0, 0);
 137
 138         /* Set up texture object without mipmap generation */
 139         glBindTexture(GL_TEXTURE_2D, textures[2]);
 140
 141         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 142         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 143         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 144         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 145                         GL_LINEAR_MIPMAP_NEAREST);
 146
 147         /* Paint normal blue mipmap set */
 148         for (i = 0; SIZE / (1 << i) > 0; i++)
 149                 fill_level(i, blue);
 150
 151         display_mipmaps(0, SIZE);
 152
 153         /* Enable GENERATE_MIPMAP and set the first (and thus all) levels to
 154          * red.
 155          */
 156         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 157         fill_level(0, red);
 158         display_mipmaps(0, SIZE * 2);
 159
 160         glDeleteTextures(3, textures);
 161
 162         glutSwapBuffers();
 163         glFlush();
 164
 165         pass = pass && check_resulting_mipmaps(0, 0, red);
 166         pass = pass && check_resulting_mipmaps(0, SIZE, blue);
 167         pass = pass && check_resulting_mipmaps(0, SIZE * 2, red);
 168
 169         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 170 }
 171
 172 void
 173 piglit_init(int argc, char **argv)
 174 {
 175         piglit_require_extension("GL_SGIS_generate_mipmap");
 176
 177         if (GLEW_VERSION_1_3) {
 178                 ActiveTexture = GLEW_GET_FUN(__glewActiveTexture);
 179         } else {
 180                 piglit_require_extension("GL_ARB_multitexture");
 181                 ActiveTexture = GLEW_GET_FUN(__glewActiveTextureARB);
 182         }
 183
 184         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 185 }