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authorKeith Whitwell <keithw@vmware.com>2009-11-06 09:22:46 +0000
committerKeith Whitwell <keithw@vmware.com>2009-11-06 09:34:02 +0000
commit5a24c66915a555d72a6377e073a732ab9d6be461 (patch)
treecb2249301a11cbf391e367923f92d8a67a4d359d
parentc22b47ebb1f00d43fe74d57a1e727fa70c4bf970 (diff)
trivial: add vbo-tri, an even simpler version of tri.c
-rw-r--r--progs/trivial/Makefile1
-rw-r--r--progs/trivial/vbo-tri.c131
2 files changed, 132 insertions, 0 deletions
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile
index 70728616d2..e15ec33ab5 100644
--- a/progs/trivial/Makefile
+++ b/progs/trivial/Makefile
@@ -153,6 +153,7 @@ SOURCES = \
tristrip-clip.c \
tristrip-flat.c \
tristrip.c \
+ vbo-tri.c \
vbo-drawarrays.c \
vbo-noninterleaved.c \
vbo-drawelements.c \
diff --git a/progs/trivial/vbo-tri.c b/progs/trivial/vbo-tri.c
new file mode 100644
index 0000000000..d4cba14414
--- /dev/null
+++ b/progs/trivial/vbo-tri.c
@@ -0,0 +1,131 @@
+/* Even simpler for many drivers than trivial/tri -- pass-through
+ * vertex shader and vertex data in a VBO.
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+
+struct {
+ GLfloat pos[4];
+ GLfloat color[4];
+} verts[] =
+{
+ { { -0.9, -0.9, 0.0, 1.0 },
+ {.8,0,0, 1},
+ },
+
+ { { 0.9, -0.9, 0.0, 1.0 },
+ { 0, .9, 0, 1 },
+ },
+
+ { { 0, 0.9, 0.0, 1.0 },
+ {0,0,.7, 1},
+ },
+};
+
+GLuint arrayObj;
+
+static void Init( void )
+{
+ GLint errno;
+ GLuint prognum;
+
+ static const char *prog1 =
+ "!!ARBvp1.0\n"
+ "MOV result.color, vertex.color;\n"
+ "MOV result.position, vertex.position;\n"
+ "END\n";
+
+
+ glGenProgramsARB(1, &prognum);
+
+ glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
+ glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
+ strlen(prog1), (const GLubyte *) prog1);
+
+ assert(glIsProgramARB(prognum));
+ errno = glGetError();
+ printf("glGetError = %d\n", errno);
+ if (errno != GL_NO_ERROR)
+ {
+ GLint errorpos;
+
+ glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
+ printf("errorpos: %d\n", errorpos);
+ printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
+ }
+
+
+ glEnableClientState( GL_VERTEX_ARRAY );
+ glEnableClientState( GL_COLOR_ARRAY );
+
+ glGenBuffersARB(1, &arrayObj);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, GL_STATIC_DRAW_ARB);
+
+ glVertexPointer( 4, GL_FLOAT, sizeof(verts[0]), 0 );
+ glColorPointer( 4, GL_FLOAT, sizeof(verts[0]), (void *)(4*sizeof(float)) );
+}
+
+
+
+static void Display( void )
+{
+ glClearColor(0.3, 0.3, 0.3, 1);
+ glClear( GL_COLOR_BUFFER_BIT );
+
+ glEnable(GL_VERTEX_PROGRAM_NV);
+ glDrawArrays( GL_TRIANGLES, 0, 3 );
+
+ glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+ 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:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 250, 250 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+ glutCreateWindow(argv[0]);
+ glewInit();
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ Init();
+ glutMainLoop();
+ return 0;
+}