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Diffstat (limited to 'progs/tests/fbotest3.c')
| -rw-r--r-- | progs/tests/fbotest3.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/progs/tests/fbotest3.c b/progs/tests/fbotest3.c new file mode 100644 index 00000000000..8e288b38b83 --- /dev/null +++ b/progs/tests/fbotest3.c @@ -0,0 +1,231 @@ +/* + * Test GL_EXT_framebuffer_object + * Like fbotest2.c but use a texture for the Z buffer / renderbuffer. + * Note: the Z texture is never resized so that limits what can be + * rendered if the window is resized. + * + * This tests a bug reported by Christoph Bumiller on 1 Feb 2010 + * on mesa3d-dev. + * + * XXX this should be made into a piglit test. + * + * Brian Paul + * 1 Feb 2010 + */ + + +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glew.h> +#include <GL/glut.h> + + +static int Win = 0; +static int Width = 400, Height = 400; +static GLuint Tex = 0; +static GLuint MyFB, ColorRb, DepthRb; +static GLboolean Animate = GL_FALSE; +static GLfloat Rotation = 0.0; + + +static void +CheckError(int line) +{ + GLenum err = glGetError(); + if (err) { + printf("fbotest3: GL Error 0x%x at line %d\n", (int) err, line); + } +} + + +static void +Display( void ) +{ + GLubyte *buffer = malloc(Width * Height * 4); + GLenum status; + + CheckError(__LINE__); + + /* draw to user framebuffer */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); + glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT); + glReadBuffer(GL_COLOR_ATTACHMENT1_EXT); + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { + printf("fbotest3: Error: Framebuffer is incomplete!!!\n"); + } + + CheckError(__LINE__); + + glClearColor(0.5, 0.5, 1.0, 0.0); + glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); + + glEnable(GL_DEPTH_TEST); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + + glPushMatrix(); + glRotatef(30.0, 1, 0, 0); + glRotatef(Rotation, 0, 1, 0); + glutSolidTeapot(2.0); + glPopMatrix(); + + /* read from user framebuffer */ + glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer); + + /* draw to window */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); + glDisable(GL_DEPTH_TEST); /* in case window has depth buffer */ + glWindowPos2iARB(0, 0); + glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer); + + free(buffer); + glutSwapBuffers(); + CheckError(__LINE__); +} + + +static void +Reshape( int width, int height ) +{ + float ar = (float) width / (float) height; + + glViewport( 0, 0, width, height ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 ); + + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); + glTranslatef( 0.0, 0.0, -15.0 ); + + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, width, height); + + Width = width; + Height = height; +} + + +static void +CleanUp(void) +{ + glDeleteFramebuffersEXT(1, &MyFB); + glDeleteRenderbuffersEXT(1, &ColorRb); + glDeleteRenderbuffersEXT(1, &DepthRb); + glDeleteTextures(1, &Tex); + assert(!glIsFramebufferEXT(MyFB)); + assert(!glIsRenderbufferEXT(ColorRb)); + assert(!glIsRenderbufferEXT(DepthRb)); + glutDestroyWindow(Win); + exit(0); +} + + +static void +Idle(void) +{ + Rotation = glutGet(GLUT_ELAPSED_TIME) * 0.1; + glutPostRedisplay(); +} + + +static void +Key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case 'a': + Animate = !Animate; + if (Animate) + glutIdleFunc(Idle); + else + glutIdleFunc(NULL); + break; + case 27: + CleanUp(); + break; + } + glutPostRedisplay(); +} + + +static void +Init( void ) +{ + if (!glutExtensionSupported("GL_EXT_framebuffer_object")) { + printf("fbotest3: GL_EXT_framebuffer_object not found!\n"); + exit(0); + } + printf("fbotest3: GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + + /* create initial tex obj as an RGBA texture */ + glGenTextures(1, &Tex); + glBindTexture(GL_TEXTURE_2D, Tex); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glEnable(GL_TEXTURE_2D); + + /* draw something to make sure the texture is used */ + glBegin(GL_POINTS); + glVertex2f(0, 0); + glEnd(); + + /* done w/ texturing */ + glDisable(GL_TEXTURE_2D); + + /* Create my Framebuffer Object */ + glGenFramebuffersEXT(1, &MyFB); + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); + assert(glIsFramebufferEXT(MyFB)); + + /* Setup color renderbuffer */ + glGenRenderbuffersEXT(1, &ColorRb); + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb); + assert(glIsRenderbufferEXT(ColorRb)); + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, + GL_RENDERBUFFER_EXT, ColorRb); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height); + + /* Setup depth renderbuffer (a texture) */ + glGenRenderbuffersEXT(1, &DepthRb); + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRb); + assert(glIsRenderbufferEXT(DepthRb)); + /* replace RGBA texture with Z texture */ + glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, Width, Height, 0, + GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, NULL); + glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, + GL_TEXTURE_2D, Tex, 0); + + CheckError(__LINE__); + + /* restore to default */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); + CheckError(__LINE__); +} + + +int +main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowPosition( 0, 0 ); + glutInitWindowSize(Width, Height); + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); + Win = glutCreateWindow(argv[0]); + glewInit(); + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + if (Animate) + glutIdleFunc(Idle); + Init(); + glutMainLoop(); + return 0; +} |