+++ /dev/null
-/**
- * Test glFramebufferBlit()
- * Brian Paul
- * 27 Oct 2009
- */
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-
-static int Win;
-static int WinWidth = 1100, WinHeight = 600;
-
-static int SrcWidth = 512, SrcHeight = 512;
-static int DstWidth = 512, DstHeight = 512;
-
-static GLuint SrcFB, DstFB;
-static GLuint SrcTex, DstTex;
-
-#if 0
-static GLenum SrcTexTarget = GL_TEXTURE_2D, SrcTexFace = GL_TEXTURE_2D;
-#else
-static GLenum SrcTexTarget = GL_TEXTURE_CUBE_MAP, SrcTexFace = GL_TEXTURE_CUBE_MAP_POSITIVE_X;
-#endif
-
-static GLenum DstTexTarget = GL_TEXTURE_2D, DstTexFace = GL_TEXTURE_2D;
-
-static GLuint SrcTexLevel = 01, DstTexLevel = 0;
-
-
-static void
-Draw(void)
-{
- GLboolean rp = GL_FALSE;
- GLubyte *buf;
- GLint srcWidth = SrcWidth >> SrcTexLevel;
- GLint srcHeight = SrcHeight >> SrcTexLevel;
- GLint dstWidth = DstWidth >> DstTexLevel;
- GLint dstHeight = DstHeight >> DstTexLevel;
- GLenum status;
-
- /* clear window */
- glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
- glClearColor(0.5, 0.5, 0.5, 1.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
-
- /* clear src buf */
- glBindFramebufferEXT(GL_FRAMEBUFFER, SrcFB);
- status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
- assert(status == GL_FRAMEBUFFER_COMPLETE_EXT);
- glClearColor(0, 1, 0, 0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* clear dst buf */
- glBindFramebufferEXT(GL_FRAMEBUFFER, DstFB);
- status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
- assert(status == GL_FRAMEBUFFER_COMPLETE_EXT);
- glClearColor(1, 0, 0, 0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* blit src -> dst */
- glBindFramebufferEXT(GL_READ_FRAMEBUFFER, SrcFB);
- glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER, DstFB);
- glBlitFramebufferEXT(0, 0, srcWidth, srcHeight,
- 0, 0, dstWidth, dstHeight,
- GL_COLOR_BUFFER_BIT, GL_NEAREST);
-
-#if 01
- /* read src results */
- buf = malloc(4 * srcWidth * srcHeight);
- memset(buf, 0x88, 4 * srcWidth * srcHeight);
- glBindFramebufferEXT(GL_FRAMEBUFFER, SrcFB);
- if (rp)
- glReadPixels(0, 0, srcWidth, srcHeight, GL_RGBA, GL_UNSIGNED_BYTE, buf);
- else {
- glBindTexture(SrcTexTarget, SrcTex);
- glGetTexImage(SrcTexFace, SrcTexLevel, GL_RGBA, GL_UNSIGNED_BYTE, buf);
- }
-
- /* draw dst in window */
- glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
- glWindowPos2i(0, 0);
- glDrawPixels(srcWidth, srcHeight, GL_RGBA, GL_UNSIGNED_BYTE, buf);
-
- printf("Src Pix[0] = %d %d %d %d\n", buf[0], buf[1], buf[2], buf[3]);
- free(buf);
-#endif
-
- glFinish();
-
- /* read dst results */
- buf = malloc(4 * dstWidth * dstHeight);
- memset(buf, 0x88, 4 * dstWidth * dstHeight);
- glBindFramebufferEXT(GL_FRAMEBUFFER, DstFB);
- if (rp)
- glReadPixels(0, 0, dstWidth, dstHeight, GL_RGBA, GL_UNSIGNED_BYTE, buf);
- else {
- glBindTexture(DstTexTarget, DstTex);
- glGetTexImage(DstTexFace, DstTexLevel, GL_RGBA, GL_UNSIGNED_BYTE, buf);
- }
-
- /* draw dst in window */
- glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
- glWindowPos2i(srcWidth + 2, 0);
- glDrawPixels(dstWidth, dstHeight, GL_RGBA, GL_UNSIGNED_BYTE, buf);
-
- printf("Dst Pix[0] = %d %d %d %d\n", buf[0], buf[1], buf[2], buf[3]);
- free(buf);
-
- glFinish();
-
- glutSwapBuffers();
-}
-
-
-static void
-Reshape(int width, int height)
-{
- WinWidth = width;
- WinHeight = 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
-SpecialKey(int key, int x, int y)
-{
- (void) x;
- (void) y;
- switch (key) {
- }
- glutPostRedisplay();
-}
-
-
-static void
-InitFBOs(void)
-{
- GLuint w, h, lvl;
-
- /* Src */
- glGenTextures(1, &SrcTex);
- glBindTexture(SrcTexTarget, SrcTex);
- w = SrcWidth;
- h = SrcHeight;
- lvl = 0;
- for (lvl = 0; ; lvl++) {
- if (SrcTexTarget == GL_TEXTURE_CUBE_MAP) {
- GLuint f;
- for (f = 0; f < 6; f++) {
- glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, lvl, GL_RGBA8,
- w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- }
- }
- else {
- /* single face */
- glTexImage2D(SrcTexFace, lvl, GL_RGBA8, w, h, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- }
- if (w == 1 && h == 1)
- break;
- if (w > 1)
- w /= 2;
- if (h > 1)
- h /= 2;
- }
-
- glGenFramebuffersEXT(1, &SrcFB);
- glBindFramebufferEXT(GL_FRAMEBUFFER, SrcFB);
- glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
- SrcTexFace, SrcTex, SrcTexLevel);
-
- /* Dst */
- glGenTextures(1, &DstTex);
- glBindTexture(DstTexTarget, DstTex);
- w = DstWidth;
- h = DstHeight;
- lvl = 0;
- for (lvl = 0; ; lvl++) {
- glTexImage2D(DstTexFace, lvl, GL_RGBA8, w, h, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- if (w == 1 && h == 1)
- break;
- if (w > 1)
- w /= 2;
- if (h > 1)
- h /= 2;
- }
-
- glGenFramebuffersEXT(1, &DstFB);
- glBindFramebufferEXT(GL_FRAMEBUFFER, DstFB);
- glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
- DstTexFace, DstTex, DstTexLevel);
-}
-
-
-static void
-Init(void)
-{
- if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
- fprintf(stderr, "This test requires GL_EXT_framebuffer_object\n");
- exit(1);
- }
-
- if (!glutExtensionSupported("GL_EXT_framebuffer_blit")) {
- fprintf(stderr, "This test requires GL_EXT_framebuffer_blit,\n");
- exit(1);
- }
-
- InitFBOs();
-
- printf("Left rect = src FBO, Right rect = dst FBO.\n");
- printf("Both should be green.\n");
-}
-
-
-int
-main(int argc, char *argv[])
-{
- glutInit(&argc, argv);
- glutInitWindowSize(WinWidth, WinHeight);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
- Win = glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutSpecialFunc(SpecialKey);
- glutDisplayFunc(Draw);
- Init();
- glutMainLoop();
- return 0;
-}
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