1 files changed, 217 insertions, 0 deletions
diff --git a/progs/tests/getteximage.c b/progs/tests/getteximage.c
new file mode 100644
index 0000000000..e4818a8fab
--- /dev/null
+++ b/progs/tests/getteximage.c
@@ -0,0 +1,217 @@
+/**
+ * Test glGetTexImage()
+ * Brian Paul
+ * 9 June 2009
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+static int Win;
+
+
+static void
+TestGetTexImage(void)
+{
+   GLuint iter;
+   GLubyte *data = (GLubyte *) malloc(1024 * 1024 * 4);
+   GLubyte *data2 = (GLubyte *) malloc(1024 * 1024 * 4);
+
+   glEnable(GL_TEXTURE_2D);
+
+   printf("glTexImage2D + glGetTexImage:\n");
+
+   for (iter = 0; iter < 8; iter++) {
+      GLint p = (iter % 8) + 3;
+      GLint w = (1 << p);
+      GLint h = (1 << p);
+      GLuint i;
+      GLint level = 0;
+
+      printf("  Testing %d x %d tex image\n", w, h);
+
+      /* fill data */
+      for (i = 0; i < w * h * 4; i++) {
+         data[i] = i & 0xff;
+         data2[i] = 0;
+      }
+
+      glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0,
+                   GL_RGBA, GL_UNSIGNED_BYTE, data);
+
+      glBegin(GL_POINTS);
+      glVertex2f(0, 0);
+      glEnd();
+
+      /* get */
+      glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2);
+
+      /* compare */
+      for (i = 0; i < w * h * 4; i++) {
+         if (data2[i] != data[i]) {
+            printf("glTexImage + glGetTexImage failure!\n");
+            printf("Expected value %d, found %d\n", data[i], data2[i]);
+            abort();
+         }
+      }
+   }
+
+   printf("Passed\n");
+   glDisable(GL_TEXTURE_2D);
+   free(data);
+   free(data2);
+}
+
+
+static GLboolean
+ColorsEqual(const GLubyte ref[4], const GLubyte act[4])
+{
+   if (abs((int) ref[0] - (int) act[0]) > 1 ||
+       abs((int) ref[1] - (int) act[1]) > 1 ||
+       abs((int) ref[2] - (int) act[2]) > 1 ||
+       abs((int) ref[3] - (int) act[3]) > 1) {
+      printf("expected %d %d %d %d\n", ref[0], ref[1], ref[2], ref[3]);
+      printf("found    %d %d %d %d\n", act[0], act[1], act[2], act[3]);
+      return GL_FALSE;
+   }
+   return GL_TRUE;
+}
+
+
+static void
+TestGetTexImageRTT(void)
+{
+   GLuint iter;
+   GLuint fb, tex;
+   GLint w = 512;
+   GLint h = 256;
+   GLint level = 0;
+   
+   glGenTextures(1, &tex);
+   glGenFramebuffersEXT(1, &fb);
+
+   glBindTexture(GL_TEXTURE_2D, tex);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0,
+                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+
+   glBindFramebuffer(GL_FRAMEBUFFER_EXT, fb);
+   glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                             GL_TEXTURE_2D, tex, level);
+
+   printf("Render to texture + glGetTexImage:\n");
+   printf("  Testing %d x %d tex image\n", w, h);
+   for (iter = 0; iter < 8; iter++) {
+      GLubyte color[4];
+      GLubyte *data2 = (GLubyte *) malloc(w * h * 4);
+      GLuint i;
+
+      /* random clear color */
+      for (i = 0; i < 4; i++) {
+         color[i] = rand() % 256;
+      }
+
+      glClearColor(color[0] / 255.0,
+                   color[1] / 255.0,
+                   color[2] / 255.0,
+                   color[3] / 255.0);
+
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      /* get */
+      glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2);
+
+      /* compare */
+      for (i = 0; i < w * h; i += 4) {
+         if (!ColorsEqual(color, data2 + i * 4)) {
+            printf("Render to texture failure!\n");
+            abort();
+         }
+      }
+
+      free(data2);
+   }
+
+   glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
+   glDeleteFramebuffersEXT(1, &fb);
+   glDeleteTextures(1, &tex);
+
+   printf("Passed\n");
+}
+
+
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   TestGetTexImage();
+
+   if (glutExtensionSupported("GL_EXT_framebuffer_object") ||
+       glutExtensionSupported("GL_ARB_framebuffer_object"))
+      TestGetTexImageRTT();
+
+   glutDestroyWindow(Win);
+   exit(0);
+
+   glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -15.0);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         glutDestroyWindow(Win);
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit(&argc, argv);
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(400, 400);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+   Win = glutCreateWindow(argv[0]);
+   glewInit();
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   Init();
+   glutMainLoop();
+   return 0;
+}