tests: quick and dirty glGetTexImage() test program

progs/tests/Makefile

@@ -48,7 +48,8 @@ SOURCES = \
 	fptest1.c \
 	fptexture.c \
 	getprocaddress.c \
-	glutfx \
+	getteximage.c \
+	glutfx.c \
 	interleave.c \
 	invert.c \
 	jkrahntest.c \

progs/tests/getteximage.c

@@ -0,0 +1,123 @@
+/**
+ * Test glGetTexImage()
+ * Brian Paul
+ * 9 June 2009
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Win;
+
+
+static void
+TestGetTexImage(void)
+{
+   GLuint iter;
+
+   for (iter = 0; iter < 20; iter++) {
+      GLint p = (iter % 6) + 4;
+      GLint w = (1 << p);
+      GLint h = (1 << p);
+      GLubyte data[512*512*4];
+      GLubyte data2[512*512*4];
+      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("Failure!\n");
+            abort();
+         }
+      }
+   }
+   printf("Passed\n");
+   glutDestroyWindow(Win);
+   exit(0);
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   TestGetTexImage();
+
+   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)
+{
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glEnable(GL_TEXTURE_2D);
+}
+
+
+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]);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   Init();
+   glutMainLoop();
+   return 0;
+}