tests: new mapvbo.c test
Test that glDrawArrays() isn't effected by a glMapBuffer()/modify/glUnmapBuffer() immediately afterward.
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@ -54,6 +54,7 @@ SOURCES = \
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jkrahntest.c \
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jkrahntest.c \
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lineclip.c \
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lineclip.c \
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manytex.c \
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manytex.c \
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mapvbo.c \
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minmag.c \
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minmag.c \
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mipmap_limits.c \
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mipmap_limits.c \
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mipmap_view.c \
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mipmap_view.c \
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@ -0,0 +1,138 @@
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/*
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* Test glMapBuffer() call immediately after glDrawArrays().
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* See details below.
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*
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* NOTE: Do not use freeglut with this test! It calls the Display()
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* callback twice right away instead of just once.
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*
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* Brian Paul
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* 27 Feb 2009
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*/
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#define GL_GLEXT_PROTOTYPES
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glut.h>
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static GLuint BufferID;
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static GLuint Win;
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/*
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* Create VBO (position and color) and load with data.
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*/
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static void
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SetupBuffers(void)
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{
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static const GLfloat data[] = {
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/* vertex */ /* color */
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0, -1, 0, 1, 1, 0,
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1, 0, 0, 1, 1, 0,
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0, 1, 0, 1, 1, 0,
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-1, 0, 0, 1, 1, 0
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};
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glGenBuffersARB(1, &BufferID);
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
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glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(data), data,
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GL_STATIC_DRAW_ARB);
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}
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static void
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Draw(void)
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{
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static int count = 1;
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printf("Draw Frame %d\n", count);
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count++;
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
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glVertexPointer(3, GL_FLOAT, 24, 0);
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glEnable(GL_VERTEX_ARRAY);
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glColorPointer(3, GL_FLOAT, 24, (void*) 12);
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glEnable(GL_COLOR_ARRAY);
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glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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if (0)
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glFinish();
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/* Immediately map the color buffer and change something.
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* This should not effect the first glDrawArrays above, but the
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* next time we draw we should see a black vertex.
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*/
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if (1) {
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GLfloat *m = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB,
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GL_WRITE_ONLY_ARB);
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m[3] = m[4] = m[5] = 0.0f; /* black vertex */
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glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
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}
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}
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static void Display( void )
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{
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glClear( GL_COLOR_BUFFER_BIT );
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Draw();
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glutSwapBuffers();
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}
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static void Reshape( int width, int height )
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{
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float ar = (float) width / (float) height;
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -15.0 );
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}
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static void Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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if (key == 27) {
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glutDestroyWindow(Win);
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exit(0);
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}
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glutPostRedisplay();
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}
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static void Init( void )
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{
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if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) {
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printf("GL_ARB_vertex_buffer_object not found!\n");
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exit(0);
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}
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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SetupBuffers();
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}
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int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( 300, 300 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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Win = glutCreateWindow(argv[0]);
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutDisplayFunc( Display );
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Init();
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glutMainLoop();
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return 0;
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}
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