Major check-in of changes for GL_EXT_framebuffer_object extension.

Main driver impacts:
- new code for creating the Mesa GLframebuffer
- new span/pixel read/write code
Some drivers not yet updated/tested.

1 files changed, 169 insertions, 0 deletions

diff --git a/progs/tests/fbotest1.c b/progs/tests/fbotest1.c
new file mode 100644
index 00000000000..1b710041786
--- /dev/null
+++ b/progs/tests/fbotest1.c
@@ -0,0 +1,169 @@
+/*
+ * Test GL_EXT_framebuffer_object
+ *
+ * Brian Paul
+ * 7 Feb 2005
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Width = 400, Height = 400;
+static GLuint MyFB;
+
+
+static void
+CheckError(int line)
+{
+   GLenum err = glGetError();
+   if (err) {
+      printf("GL Error 0x%x at line %d\n", (int) err, line);
+   }
+}
+
+
+static void
+Display( void )
+{
+   GLubyte *buffer = malloc(Width * Height * 4);
+   GLenum status;
+
+   /* 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("Framebuffer incomplete!!!\n");
+   }
+
+   glClearColor(0.5, 0.5, 1.0, 0.0);
+   glClear( GL_COLOR_BUFFER_BIT );
+
+   glBegin(GL_POLYGON);
+   glColor3f(1, 0, 0);
+   glVertex2f(-1, -1);
+   glColor3f(0, 1, 0);
+   glVertex2f(1, -1);
+   glColor3f(0, 0, 1);
+   glVertex2f(0, 1);
+   glEnd();
+
+   /* read from user framebuffer */
+   glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+   /* draw to window */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+   glWindowPos2iARB(0, 0);
+   glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+   free(buffer);
+   glutSwapBuffers();
+}
+
+
+static void
+Reshape( int width, int height )
+{
+   float ar = (float) width / (float) height;
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+#if 0
+   glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
+#else
+   glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+#endif
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+   Width = width;
+   Height = height;
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+}
+
+
+static void
+Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init( void )
+{
+   GLuint rb;
+   GLint i;
+
+   if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
+      printf("GL_EXT_framebuffer_object not found!\n");
+      /*exit(0);*/
+   }
+   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+   glGenFramebuffersEXT(1, &MyFB);
+   assert(MyFB);
+   assert(glIsFramebufferEXT(MyFB));
+   glDeleteFramebuffersEXT(1, &MyFB);
+   assert(!glIsFramebufferEXT(MyFB));
+   /* Note, continue to use MyFB below */
+
+   glGenRenderbuffersEXT(1, &rb);
+   assert(rb);
+   assert(glIsRenderbufferEXT(rb));
+   glDeleteRenderbuffersEXT(1, &rb);
+   assert(!glIsRenderbufferEXT(rb));
+   rb = 42; /* an arbitrary ID */
+
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+   assert(glIsFramebufferEXT(MyFB));
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
+   assert(glIsRenderbufferEXT(rb));
+
+   glGetIntegerv(GL_RENDERBUFFER_BINDING_EXT, &i);
+   assert(i == rb);
+
+   glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &i);
+   assert(i == MyFB);
+
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+                                GL_RENDERBUFFER_EXT, rb);
+
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+
+   CheckError(__LINE__);
+
+   /* restore to default */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+}
+
+
+int
+main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize(Width, Height);
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}