Demos (master): trivial: add drawelements-large

[Keith Whitwell]

Module: Demos
Branch: master
Commit: 09fb3da886168ab3aa635acac09fba45db1c3610
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=09fb3da886168ab3aa635acac09fba45db1c3610

Author: Keith Whitwell <keithw at vmware.com>
Date:   Tue Oct  5 09:53:56 2010 +0100

trivial: add drawelements-large

---

 src/trivial/SConscript           |    1 +
 src/trivial/drawelements-large.c |  121 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+), 0 deletions(-)

diff --git a/src/trivial/SConscript b/src/trivial/SConscript
index 24b4f91..84270a4 100644
--- a/src/trivial/SConscript
+++ b/src/trivial/SConscript
@@ -15,6 +15,7 @@ progs = [
 	'drawarrays',
 	'draw2arrays',
 	'drawelements',
+	'drawelements-large',
 	'drawrange',
 	'flat-clip',
 	'fs-tri',
diff --git a/src/trivial/drawelements-large.c b/src/trivial/drawelements-large.c
new file mode 100644
index 0000000..fc23985
--- /dev/null
+++ b/src/trivial/drawelements-large.c
@@ -0,0 +1,121 @@
+/* Test rebasing */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+#define NR_VERTS 20000
+GLfloat verts[NR_VERTS][4];
+GLushort indices[NR_VERTS*2];
+
+
+
+static void Init( void )
+{
+   GLint errno;
+   GLuint prognum;
+   GLint i;
+
+   static const char *prog1 =
+      "!!ARBvp1.0\n"
+      "MOV  result.color, {1.0}.xxxx;\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 );
+   glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), verts );
+
+
+   for (i = 0; i < NR_VERTS; i++) {
+      verts[i][0] = cos(i / (float)NR_VERTS * 2.0 * 3.141592);
+      verts[i][1] = sin(i / (float)NR_VERTS * 2.0 * 3.141592);
+      verts[i][2] = 0.0;
+      verts[i][3] = 1.0;
+
+      indices[2*i+0] = i;
+      indices[2*i+1] = (i+1 == NR_VERTS) ? 0 : i+1;
+   }
+}
+
+
+
+static void Display( void )
+{
+   glClearColor(0.3, 0.3, 0.3, 1);
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glEnable(GL_VERTEX_PROGRAM_NV);
+
+   /* Should have min_index == 1, maybe force a rebase:
+    */
+   glDrawElements( GL_LINES, NR_VERTS*2, GL_UNSIGNED_SHORT, indices );
+
+   glFlush(); 
+}
+
+
+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_SINGLE | GLUT_DEPTH );
+   glutCreateWindow(argv[0]);
+   glewInit();
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}