Commit 46c40566 authored by Roland Scheidegger's avatar Roland Scheidegger

add simple test for two-sided stencil functionality

parent 8dc18848
......@@ -60,6 +60,7 @@ SOURCES = \
readrate.c \
seccolor.c \
sharedtex.c \
stencil_twoside.c \
stencilwrap.c \
stencil_wrap.c \
subtexrate.c \
......
/*
* (C) Copyright IBM Corporation 2004
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file stencil_twoside.c
*
* Simple test of GL_ATI_separate_stencil (or the OGL 2.0 equivalent) functionality.
* Four squares are drawn
* with different stencil modes, but all should be rendered with the same
* final color.
*/
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
static int use20syntax = 1;
static int Width = 550;
static int Height = 200;
static const GLfloat Near = 5.0, Far = 25.0;
static PFNGLSTENCILFUNCSEPARATEPROC stencil_func_separate = NULL;
static PFNGLSTENCILFUNCSEPARATEATIPROC stencil_func_separate_ati = NULL;
static PFNGLSTENCILOPSEPARATEPROC stencil_op_separate = NULL;
static void Display( void )
{
GLint max_stencil;
GLint stencil_bits;
unsigned i;
glGetIntegerv( GL_STENCIL_BITS, & stencil_bits );
max_stencil = (1U << stencil_bits) - 1;
printf( "Stencil bits = %u, maximum stencil value = 0x%08x\n",
stencil_bits, max_stencil );
glClearStencil( 1 );
glClearColor( 0.2, 0.2, 0.8, 0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
| GL_STENCIL_BUFFER_BIT );
glPushMatrix();
/* This is the "reference" square.
*/
glDisable(GL_STENCIL_TEST);
glTranslatef(-6.0, 0, 0);
glBegin(GL_QUADS);
glColor3f( 0.5, 0.5, 0.5 );
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
glEnable(GL_STENCIL_TEST);
/* Draw the first two squares using incr for the affected face
*/
if (use20syntax) {
stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
}
else {
stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
}
stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
glTranslatef(3.0, 0, 0);
glBegin(GL_QUADS);
glColor3f( 0.9, 0.9, 0.9 );
/* this should be front facing */
for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
}
glEnd();
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glBegin(GL_QUADS);
glColor3f( 0.5, 0.5, 0.5 );
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
if (use20syntax) {
stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
}
else {
stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
}
stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
glTranslatef(3.0, 0, 0);
glBegin(GL_QUADS);
glColor3f( 0.9, 0.9, 0.9 );
/* this should be back facing */
for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
glVertex2f(-1, -1);
glVertex2f(-1, 1);
glVertex2f( 1, 1);
glVertex2f( 1, -1);
}
glEnd();
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glBegin(GL_QUADS);
glColor3f( 0.5, 0.5, 0.5 );
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
if (use20syntax) {
stencil_func_separate(GL_FRONT, GL_NEVER, 0, ~0);
stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
}
else {
stencil_func_separate_ati(GL_NEVER, GL_ALWAYS, 0, ~0);
}
stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
glTranslatef(3.0, 0, 0);
glBegin(GL_QUADS);
glColor3f( 0.9, 0.9, 0.9 );
/* this should be back facing */
for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
/* this should be back facing */
glVertex2f(-1, -1);
glVertex2f(-1, 1);
glVertex2f( 1, 1);
glVertex2f( 1, -1);
/* this should be front facing */
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
}
glEnd();
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glBegin(GL_QUADS);
glColor3f( 0.5, 0.5, 0.5 );
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
if (use20syntax) {
stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
}
else {
stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
}
stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
glTranslatef(3.0, 0, 0);
glBegin(GL_QUADS);
glColor3f( 0.9, 0.9, 0.9 );
/* this should be back facing */
for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
/* this should be back facing */
glVertex2f(-1, -1);
glVertex2f(-1, 1);
glVertex2f( 1, 1);
glVertex2f( 1, -1);
/* this should be front facing */
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
}
glEnd();
glStencilFunc(GL_EQUAL, 1, ~0);
glBegin(GL_QUADS);
glColor3f( 0.5, 0.5, 0.5 );
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
glPopMatrix();
glutSwapBuffers();
}
static void Reshape( int width, int height )
{
GLfloat ar = (float) width / (float) height;
Width = width;
Height = height;
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
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();
}
static void Init( void )
{
const char * const ver_string = (const char * const)
glGetString( GL_VERSION );
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", ver_string);
if ( !glutExtensionSupported("GL_ATI_separate_stencil")
&& (atof( ver_string ) < 2.0) ) {
printf("Sorry, this program requires either GL_ATI_separate_stencil or OpenGL 2.0.\n");
exit(1);
}
if (atof( ver_string ) < 2.0) {
use20syntax = 0;
}
stencil_func_separate = glutGetProcAddress( "glStencilFuncSeparate" );
stencil_func_separate_ati = glutGetProcAddress( "glStencilFuncSeparateATI" );
stencil_op_separate = glutGetProcAddress( "glStencilOpSeparate" );
printf("\nAll 5 squares should be the same color.\n");
glEnable( GL_BLEND );
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( Width, Height );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL );
glutCreateWindow( "GL_ATI_separate_stencil test" );
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
return 0;
}
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