tests: new mapvbo.c test

Test that glDrawArrays() isn't effected by a glMapBuffer()/modify/glUnmapBuffer()
immediately afterward.

1 files changed, 138 insertions, 0 deletions

diff --git a/progs/tests/mapvbo.c b/progs/tests/mapvbo.c
new file mode 100644
index 00000000000..49e120de73c
--- /dev/null
+++ b/progs/tests/mapvbo.c
@@ -0,0 +1,138 @@
+/*
+ * Test glMapBuffer() call immediately after glDrawArrays().
+ * See details below.
+ *
+ * NOTE: Do not use freeglut with this test!  It calls the Display()
+ * callback twice right away instead of just once.
+ *
+ * Brian Paul
+ * 27 Feb 2009
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+static GLuint BufferID;
+
+
+static GLuint Win;
+
+
+
+
+/*
+ * Create VBO (position and color) and load with data.
+ */
+static void
+SetupBuffers(void)
+{
+   static const GLfloat data[] = {
+      /* vertex */     /* color */
+      0, -1,  0,      1,    1,   0,
+      1,  0,  0,      1,    1,   0,
+      0,  1,  0,      1,    1,   0,
+      -1, 0,  0,      1,    1,   0
+   };
+
+   glGenBuffersARB(1, &BufferID);
+   glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
+   glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(data), data,
+                   GL_STATIC_DRAW_ARB);
+}
+
+
+static void
+Draw(void)
+{
+   static int count = 1;
+
+   printf("Draw Frame %d\n", count);
+   count++;
+
+   glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
+   glVertexPointer(3, GL_FLOAT, 24, 0);
+   glEnable(GL_VERTEX_ARRAY);
+
+   glColorPointer(3, GL_FLOAT, 24, (void*) 12);
+   glEnable(GL_COLOR_ARRAY);
+
+   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+   if (0)
+      glFinish();
+
+   /* Immediately map the color buffer and change something.
+    * This should not effect the first glDrawArrays above, but the
+    * next time we draw we should see a black vertex.
+    */
+   if (1) {
+      GLfloat *m = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB,
+                                              GL_WRITE_ONLY_ARB);
+      m[3] = m[4] = m[5] = 0.0f; /* black vertex */
+      glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+   }
+}
+
+
+static void Display( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT );
+   Draw();
+   glutSwapBuffers();
+}
+
+
+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 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   if (key == 27) {
+      glutDestroyWindow(Win);
+      exit(0);
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+   if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) {
+      printf("GL_ARB_vertex_buffer_object not found!\n");
+      exit(0);
+   }
+   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+   SetupBuffers();
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 300, 300 );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+   Win = glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}