tests/texturing/getteximage-simple.c

   1 /**
   2  * @file getteximage-simple.c
   3  *
   4  * Extremely basic test to check whether image data can be retrieved.
   5  *
   6  * Note that the texture is used in a full frame of rendering before
   7  * the readback, to ensure that buffer manager related code for uploading
   8  * texture images is executed before the readback.
   9  *
  10  * This used to crash for R300+bufmgr.
  11  */
  12
  13 #include "piglit-util.h"
  14
  15 int piglit_width = 100, piglit_height = 100;
  16 int piglit_window_mode = GLUT_RGBA | GLUT_DOUBLE;
  17 static GLubyte data[4096]; /* 64*16*4 */
  18
  19 static int test_getteximage(void)
  20 {
  21         GLubyte compare[4096];
  22         int i;
  23
  24         glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, compare);
  25
  26         for(i = 0; i < 4096; ++i) {
  27                 if (data[i] != compare[i]) {
  28                         printf("GetTexImage() returns incorrect data in byte %i\n", i);
  29                         printf("    corresponding to (%i,%i) channel %i\n", i / 64, (i / 4) % 16, i % 4);
  30                         printf("    expected: %i\n", data[i]);
  31                         printf("    got: %i\n", compare[i]);
  32                         return 0;
  33                 }
  34         }
  35
  36         return 1;
  37 }
  38
  39 enum piglit_result
  40 piglit_display(void)
  41 {
  42         int pass;
  43
  44         glClearColor(0.0, 0.0, 0.0, 1.0);
  45         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  46
  47         glEnable(GL_TEXTURE_2D);
  48         glBegin(GL_QUADS);
  49         glTexCoord2f(0, 0);
  50         glVertex2f(0, 0);
  51         glTexCoord2f(1, 0);
  52         glVertex2f(1, 0);
  53         glTexCoord2f(1, 1);
  54         glVertex2f(1, 1);
  55         glTexCoord2f(0, 1);
  56         glVertex2f(0, 1);
  57         glEnd();
  58
  59         glutSwapBuffers();
  60
  61         pass = test_getteximage();
  62
  63         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  64 }
  65
  66 static void Reshape(int width, int height)
  67 {
  68         piglit_width = width;
  69         piglit_height = height;
  70         glViewport(0, 0, width, height);
  71         glMatrixMode(GL_PROJECTION);
  72         glLoadIdentity();
  73         glOrtho(0.0, 1.0, 0.0, 1.0, -2.0, 6.0);
  74         glScalef(1.0, 1.0, -1.0); // flip z-axis
  75         glMatrixMode(GL_MODELVIEW);
  76         glLoadIdentity();
  77 }
  78
  79 void piglit_init(int argc, char **argv)
  80 {
  81         int i;
  82
  83         glutReshapeFunc(Reshape);
  84
  85         for(i = 0; i < 4096; ++i)
  86                 data[i] = rand() & 0xff;
  87
  88         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  89         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  90         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
  91
  92         Reshape(piglit_width, piglit_height);
  93 }