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-rw-r--r--progs/tests/getteximage.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/progs/tests/getteximage.c b/progs/tests/getteximage.c
new file mode 100644
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+++ b/progs/tests/getteximage.c
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+/**
+ * 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;
+}