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-rw-r--r--progs/tests/getteximage.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/progs/tests/getteximage.c b/progs/tests/getteximage.c
new file mode 100644
index 0000000000..71f29b4ac8
--- /dev/null
+++ b/progs/tests/getteximage.c
@@ -0,0 +1,253 @@
+/**
+ * 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(GLboolean npot)
+{
+ 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 = npot ? (p * 20) : (1 << p);
+ GLint h = npot ? (p * 10) : (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(GLboolean npot)
+{
+ GLuint iter;
+
+ printf("Render to texture + glGetTexImage:\n");
+
+ for (iter = 0; iter < 8; iter++) {
+
+ GLuint fb, tex;
+ GLint w, h;
+ GLint level = 0;
+
+ if (npot) {
+ w = 200 + iter * 40;
+ h = 200 + iter * 12;
+ }
+ else {
+ w = 4 << iter;
+ h = 4 << iter;
+ }
+
+ 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);
+
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+ glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+ GL_TEXTURE_2D, tex, level);
+
+ glViewport(0, 0, w, h);
+
+ printf(" Testing %d x %d tex image\n", w, h);
+ {
+ static const GLubyte blue[4] = {0, 0, 255, 255};
+ 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);
+
+ /* draw polygon over top half, in blue */
+ glColor4ubv(blue);
+ glRectf(0, 0.5, 1.0, 1.0);
+
+ /* get */
+ glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2);
+
+ /* compare */
+ for (i = 0; i < w * h; i += 4) {
+ if (i < w * h / 2) {
+ /* lower half */
+ if (!ColorsEqual(color, data2 + i * 4)) {
+ printf("Render to texture failure (expected clear color)!\n");
+ abort();
+ }
+ }
+ else {
+ /* upper half */
+ if (!ColorsEqual(blue, data2 + i * 4)) {
+ printf("Render to texture failure (expected blue)!\n");
+ abort();
+ }
+ }
+ }
+
+ free(data2);
+ }
+
+ glBindFramebufferEXT(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(GL_FALSE);
+ if (glutExtensionSupported("GL_ARB_texture_non_power_of_two"))
+ TestGetTexImage(GL_TRUE);
+
+ if (glutExtensionSupported("GL_EXT_framebuffer_object") ||
+ glutExtensionSupported("GL_ARB_framebuffer_object")) {
+ TestGetTexImageRTT(GL_FALSE);
+ if (glutExtensionSupported("GL_ARB_texture_non_power_of_two"))
+ TestGetTexImageRTT(GL_TRUE);
+ }
+
+ glutDestroyWindow(Win);
+ exit(0);
+
+ glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+ glViewport(0, 0, width, height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(0, 1, 0, 1, -1, 1);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0, 0.0, 0.0);
+}
+
+
+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;
+}