blob: 008da8625e20848a0651eea9370ed6f6b02821e2 [file] [log] [blame]
/*
* Demonstrates mixed texgen/non-texgen texture coordinates.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/glut.h>
#undef max
#undef min
#define max( a, b ) ((a) >= (b) ? (a) : (b))
#define min( a, b ) ((a) <= (b) ? (a) : (b))
GLfloat labelColor0[4] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat labelColor1[4] = { 1.0, 1.0, 0.4, 1.0 };
GLfloat *labelInfoColor = labelColor0;
GLboolean doubleBuffered = GL_TRUE;
GLboolean drawTextured = GL_TRUE;
int textureWidth = 64;
int textureHeight = 64;
int winWidth = 580, winHeight = 720;
const GLfloat texmat_swap_rq[16] = { 1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 1.0, 0.0};
const GLfloat nullPlane[4] = { 0.0, 0.0, 0.0, 0.0 };
const GLfloat ObjPlaneS1[4] = { 1.0, 0.0, 1.0, 0.0 };
const GLfloat ObjPlaneS2[4] = { 0.5, 0.0, 0.0, 0.0 };
const GLfloat ObjPlaneS3[4] = { 1.0, 0.0, 0.0, 0.0 };
const GLfloat ObjPlaneT[4] = { 0.0, 1.0, 0.0, 0.0 };
const GLfloat ObjPlaneT2[4] = { 0.0, 0.5, 0.0, 0.0 };
const GLfloat ObjPlaneT3[4] = { 0.0, 1.0, 0.0, 0.0 };
const GLfloat ObjPlaneR[4] = { 0.0, 0.0, 1.0, 0.0 };
const GLfloat ObjPlaneQ[4] = { 0.0, 0.0, 0.0, 0.5 };
static void checkErrors( void )
{
GLenum error;
while ( (error = glGetError()) != GL_NO_ERROR ) {
fprintf( stderr, "Error: %s\n", (char *) gluErrorString( error ) );
}
}
static void drawString( const char *string, GLfloat x, GLfloat y,
const GLfloat color[4] )
{
glColor4fv( color );
glRasterPos2f( x, y );
while ( *string ) {
glutBitmapCharacter( GLUT_BITMAP_TIMES_ROMAN_10, *string );
string++;
}
}
static void begin2D( int width, int height )
{
glMatrixMode( GL_PROJECTION );
glPushMatrix();
glLoadIdentity();
glOrtho( 0, width, 0, height, -1, 1 );
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
glLoadIdentity();
}
static void end2D( void )
{
glMatrixMode( GL_PROJECTION );
glPopMatrix();
glMatrixMode( GL_MODELVIEW );
glPopMatrix();
}
static void initialize( void )
{
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( -1.5, 1.5, -1.5, 1.5, -1.5, 1.5 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glShadeModel( GL_FLAT );
}
/* ARGSUSED1 */
static void keyboard( unsigned char c, int x, int y )
{
switch ( c ) {
case 't':
drawTextured = !drawTextured;
break;
case 27: /* Escape key should force exit. */
exit(0);
break;
default:
break;
}
glutPostRedisplay();
}
/* ARGSUSED1 */
static void special( int key, int x, int y )
{
switch ( key ) {
case GLUT_KEY_DOWN:
break;
case GLUT_KEY_UP:
break;
case GLUT_KEY_LEFT:
break;
case GLUT_KEY_RIGHT:
break;
default:
break;
}
glutPostRedisplay();
}
static void
reshape( int w, int h )
{
winWidth = w;
winHeight = h;
/* No need to call glViewPort here since "draw" calls it! */
}
static void loadTexture( int width, int height )
{
int alphaSize = 1;
int rgbSize = 3;
GLubyte *texImage, *p;
int elementsPerGroup, elementSize, groupSize, rowSize;
int i, j;
elementsPerGroup = alphaSize + rgbSize;
elementSize = sizeof(GLubyte);
groupSize = elementsPerGroup * elementSize;
rowSize = width * groupSize;
if ( (texImage = (GLubyte *) malloc( height * rowSize ) ) == NULL ) {
fprintf( stderr, "texture malloc failed\n" );
return;
}
for ( i = 0 ; i < height ; i++ )
{
p = texImage + i * rowSize;
for ( j = 0 ; j < width ; j++ )
{
if ( rgbSize > 0 )
{
/**
** +-----+-----+
** | | |
** | R | G |
** | | |
** +-----+-----+
** | | |
** | Y | B |
** | | |
** +-----+-----+
**/
if ( i > height / 2 ) {
if ( j < width / 2 ) {
p[0] = 0xff;
p[1] = 0x00;
p[2] = 0x00;
} else {
p[0] = 0x00;
p[1] = 0xff;
p[2] = 0x00;
}
} else {
if ( j < width / 2 ) {
p[0] = 0xff;
p[1] = 0xff;
p[2] = 0x00;
} else {
p[0] = 0x00;
p[1] = 0x00;
p[2] = 0xff;
}
}
p += 3 * elementSize;
}
if ( alphaSize > 0 )
{
/**
** +-----------+
** | W |
** | +-----+ |
** | | | |
** | | B | |
** | | | |
** | +-----+ |
** | |
** +-----------+
**/
int i2 = i - height / 2;
int j2 = j - width / 2;
int h8 = height / 8;
int w8 = width / 8;
if ( -h8 <= i2 && i2 <= h8 && -w8 <= j2 && j2 <= w8 ) {
p[0] = 0x00;
} else if ( -2 * h8 <= i2 && i2 <= 2 * h8 && -2 * w8 <= j2 && j2 <= 2 * w8 ) {
p[0] = 0x55;
} else if ( -3 * h8 <= i2 && i2 <= 3 * h8 && -3 * w8 <= j2 && j2 <= 3 * w8 ) {
p[0] = 0xaa;
} else {
p[0] = 0xff;
}
p += elementSize;
}
}
}
glTexImage2D( GL_TEXTURE_2D, 0,
GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, texImage );
free( texImage );
}
static void drawSample( int x, int y, int w, int h,
int texgenenabled, int coordnr )
{
char buf[255];
glViewport( x, y, w, h );
glScissor( x, y, w, h );
glClearColor( 0.1, 0.1, 0.1, 1.0 );
glClear( GL_COLOR_BUFFER_BIT );
begin2D( w, h );
if (texgenenabled == 2) {
sprintf( buf, "TexCoord%df", coordnr);
drawString( buf, 10, h - 15, labelInfoColor );
sprintf( buf, "texgen enabled for %s coordinate(s)", coordnr == 2 ? "S" : "S/T");
drawString( buf, 10, 5, labelInfoColor );
}
else if (texgenenabled == 0) {
sprintf( buf, "TexCoord%df", coordnr);
drawString( buf, 10, h - 15, labelInfoColor );
drawString( "no texgen", 10, 5, labelInfoColor );
}
else if (texgenenabled == 1) {
drawString( "no TexCoord", 10, h - 15, labelInfoColor );
sprintf( buf, "texgen enabled for %s coordinate(s)",
coordnr == 2 ? "S/T" : (coordnr == 3 ? "S/T/R" : "S/T/R/Q"));
drawString( buf, 10, 5, labelInfoColor );
}
end2D();
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
loadTexture( textureWidth, textureHeight );
if ( drawTextured ) {
glEnable( GL_TEXTURE_2D );
}
glDisable( GL_TEXTURE_GEN_S );
glDisable( GL_TEXTURE_GEN_T );
glDisable( GL_TEXTURE_GEN_R );
glDisable( GL_TEXTURE_GEN_Q );
glMatrixMode( GL_TEXTURE );
glLoadIdentity();
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
switch (coordnr) {
case 2:
switch (texgenenabled) {
case 0:
glBegin( GL_QUADS );
glTexCoord2f( 0.0, 0.0 );
glVertex2f( -0.8, -0.8 );
glTexCoord2f( 1.0, 0.0 );
glVertex2f( 0.8, -0.8 );
glTexCoord2f( 1.0, 1.0 );
glVertex2f( 0.8, 0.8 );
glTexCoord2f( 0.0, 1.0 );
glVertex2f( -0.8, 0.8 );
glEnd();
break;
case 1:
glTranslatef( -0.8, -0.8, 0.0 );
glScalef( 1.6, 1.6, 1.0 );
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS3);
glTexGenfv(GL_T, GL_OBJECT_PLANE, ObjPlaneT3);
glTexGenfv(GL_R, GL_OBJECT_PLANE, nullPlane);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, nullPlane);
glEnable( GL_TEXTURE_GEN_S );
glEnable( GL_TEXTURE_GEN_T );
/* Issue a texcoord here to be sure Q isn't left over from a
* previous sample.
*/
glTexCoord1f( 0.0 );
glBegin( GL_QUADS );
glVertex2f( 0.0, 0.0 );
glVertex2f( 1.0, 0.0 );
glVertex2f( 1.0, 1.0 );
glVertex2f( 0.0, 1.0 );
glEnd();
break;
case 2:
/* make sure that texgen T and non-texgen S coordinate are wrong */
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS1);
glTexGenfv(GL_T, GL_OBJECT_PLANE, nullPlane);
glTexGenfv(GL_R, GL_OBJECT_PLANE, nullPlane);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, nullPlane);
glEnable( GL_TEXTURE_GEN_S );
glBegin( GL_QUADS );
/* use z coordinate to get correct texgen values... */
glTexCoord2f( 0.0, 0.0 );
glVertex3f( -0.8, -0.8, 0.8 );
glTexCoord2f( 0.0, 0.0 );
glVertex3f( 0.8, -0.8, 0.2 );
glTexCoord2f( 0.0, 1.0 );
glVertex3f( 0.8, 0.8, 0.2 );
glTexCoord2f( 0.0, 1.0 );
glVertex3f( -0.8, 0.8, 0.8 );
glEnd();
break;
}
break;
case 3:
glMatrixMode( GL_TEXTURE );
glLoadMatrixf( texmat_swap_rq );
glMatrixMode( GL_MODELVIEW );
glTranslatef( -0.8, -0.8, 0.0 );
glScalef( 1.6, 1.6, 1.0 );
switch (texgenenabled) {
case 0:
glBegin( GL_QUADS );
glTexCoord3f( 0.0, 0.0, 0.5 );
glVertex2f( 0.0, 0.0 );
glTexCoord3f( 0.5, 0.0, 0.5 );
glVertex2f( 1.0, 0.0 );
glTexCoord3f( 0.5, 0.5, 0.5 );
glVertex2f( 1.0, 1.0 );
glTexCoord3f( 0.0, 0.5, 0.5 );
glVertex2f( 0.0, 1.0 );
glEnd();
break;
case 1:
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS2);
glTexGenfv(GL_T, GL_OBJECT_PLANE, ObjPlaneT2);
glTexGenfv(GL_R, GL_OBJECT_PLANE, ObjPlaneR);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, nullPlane);
glEnable( GL_TEXTURE_GEN_S );
glEnable( GL_TEXTURE_GEN_T );
glEnable( GL_TEXTURE_GEN_R );
glTexCoord1f( 0.0 ); /* to make sure Q is 1.0 */
glBegin( GL_QUADS );
glVertex3f( 0.0, 0.0, 0.5 );
glVertex3f( 1.0, 0.0, 0.5 );
glVertex3f( 1.0, 1.0, 0.5 );
glVertex3f( 0.0, 1.0, 0.5 );
glEnd();
break;
case 2:
/* make sure that texgen R/Q and non-texgen S/T coordinates are wrong */
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS2);
glTexGenfv(GL_T, GL_OBJECT_PLANE, ObjPlaneT2);
glTexGenfv(GL_R, GL_OBJECT_PLANE, nullPlane);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, nullPlane);
glEnable( GL_TEXTURE_GEN_S );
glEnable( GL_TEXTURE_GEN_T );
glBegin( GL_QUADS );
glTexCoord3f( 0.0, 0.0, 0.5 );
glVertex2f( 0.0, 0.0);
glTexCoord3f( 0.0, 0.0, 0.5 );
glVertex2f( 1.0, 0.0);
glTexCoord3f( 0.0, 0.0, 0.5 );
glVertex2f( 1.0, 1.0);
glTexCoord3f( 0.0, 0.0, 0.5 );
glVertex2f( 0.0, 1.0);
glEnd();
break;
}
break;
case 4:
switch (texgenenabled) {
case 0:
glBegin( GL_QUADS );
/* don't need r coordinate but still setting it I'm mean */
glTexCoord4f( 0.0, 0.0, 0.0, 0.5 );
glVertex2f( -0.8, -0.8 );
glTexCoord4f( 0.5, 0.0, 0.2, 0.5 );
glVertex2f( 0.8, -0.8 );
glTexCoord4f( 0.5, 0.5, 0.5, 0.5 );
glVertex2f( 0.8, 0.8 );
glTexCoord4f( 0.0, 0.5, 0.5, 0.5 );
glVertex2f( -0.8, 0.8 );
glEnd();
break;
case 1:
glTranslatef( -0.8, -0.8, 0.0 );
glScalef( 1.6, 1.6, 1.0 );
/* make sure that texgen R/Q and non-texgen S/T coordinates are wrong */
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS2);
glTexGenfv(GL_T, GL_OBJECT_PLANE, ObjPlaneT2);
glTexGenfv(GL_R, GL_OBJECT_PLANE, ObjPlaneR);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, ObjPlaneQ);
glEnable( GL_TEXTURE_GEN_S );
glEnable( GL_TEXTURE_GEN_T );
glEnable( GL_TEXTURE_GEN_R );
glEnable( GL_TEXTURE_GEN_Q );
glBegin( GL_QUADS );
glVertex2f( 0.0, 0.0 );
glVertex2f( 1.0, 0.0 );
glVertex2f( 1.0, 1.0 );
glVertex2f( 0.0, 1.0 );
glEnd();
break;
case 2:
glTranslatef( -0.8, -0.8, 0.0 );
glScalef( 1.6, 1.6, 1.0 );
/* make sure that texgen R/Q and non-texgen S/T coordinates are wrong */
glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
glTexGenfv(GL_S, GL_OBJECT_PLANE, ObjPlaneS2);
glTexGenfv(GL_T, GL_OBJECT_PLANE, ObjPlaneT2);
glTexGenfv(GL_R, GL_OBJECT_PLANE, nullPlane);
glTexGenfv(GL_Q, GL_OBJECT_PLANE, nullPlane);
glEnable( GL_TEXTURE_GEN_S );
glEnable( GL_TEXTURE_GEN_T );
glBegin( GL_QUADS );
glTexCoord4f( 0.0, 0.0, 0.0, 0.5 );
glVertex2f( 0.0, 0.0 );
glTexCoord4f( 0.0, 0.0, 0.2, 0.5 );
glVertex2f( 1.0, 0.0 );
glTexCoord4f( 0.0, 0.0, 0.5, 0.5 );
glVertex2f( 1.0, 1.0 );
glTexCoord4f( 0.0, 0.0, 0.75, 0.5 );
glVertex2f( 0.0, 1.0 );
glEnd();
break;
}
break;
}
glPopMatrix();
glDisable( GL_TEXTURE_2D );
}
static void display( void )
{
int numX = 3, numY = 3;
float xBase = (float) winWidth * 0.01;
float xOffset = (winWidth - xBase) / numX;
float xSize = max( xOffset - xBase, 1 );
float yBase = (float) winHeight * 0.01;
float yOffset = (winHeight - yBase) / numY;
float ySize = max( yOffset - yBase, 1 );
float x, y;
int i, j;
glViewport( 0, 0, winWidth, winHeight );
glDisable( GL_SCISSOR_TEST );
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glClear( GL_COLOR_BUFFER_BIT );
glEnable( GL_SCISSOR_TEST );
x = xBase;
y = (winHeight - 1) - yOffset;
for ( i = 0 ; i < numY ; i++ )
{
labelInfoColor = labelColor1;
for ( j = 0 ; j < numX ; j++ ) {
drawSample( x, y, xSize, ySize, i, j+2 );
x += xOffset;
}
x = xBase;
y -= yOffset;
}
if ( doubleBuffered ) {
glutSwapBuffers();
} else {
glFlush();
}
checkErrors();
}
static void usage( char *name )
{
fprintf( stderr, "usage: %s [ options ]\n", name );
fprintf( stderr, "\n" );
fprintf( stderr, "options:\n" );
fprintf( stderr, " -sb single buffered\n" );
fprintf( stderr, " -db double buffered\n" );
fprintf( stderr, " -info print OpenGL driver info\n" );
}
static void instructions( void )
{
fprintf( stderr, "texgenmix - mixed texgen/non-texgen texture coordinate test\n" );
fprintf( stderr, "all quads should look the same!\n" );
fprintf( stderr, "\n" );
fprintf( stderr, " [t] - toggle texturing\n" );
}
int main( int argc, char *argv[] )
{
GLboolean info = GL_FALSE;
int i;
glutInit( &argc, argv );
for ( i = 1 ; i < argc ; i++ ) {
if ( !strcmp( "-sb", argv[i] ) ) {
doubleBuffered = GL_FALSE;
} else if ( !strcmp( "-db", argv[i] ) ) {
doubleBuffered = GL_TRUE;
} else if ( !strcmp( "-info", argv[i] ) ) {
info = GL_TRUE;
} else {
usage( argv[0] );
exit( 1 );
}
}
if ( doubleBuffered ) {
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
} else {
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE );
}
glutInitWindowSize( winWidth, winHeight );
glutInitWindowPosition( 0, 0 );
glutCreateWindow( "Mixed texgen/non-texgen texture coordinate test" );
glewInit();
initialize();
instructions();
if ( info ) {
printf( "\n" );
printf( "GL_RENDERER = %s\n", (char *) glGetString( GL_RENDERER ) );
printf( "GL_VERSION = %s\n", (char *) glGetString( GL_VERSION ) );
printf( "GL_VENDOR = %s\n", (char *) glGetString( GL_VENDOR ) ) ;
printf( "GL_EXTENSIONS = %s\n", (char *) glGetString( GL_EXTENSIONS ) );
}
glutDisplayFunc( display );
glutReshapeFunc( reshape );
glutKeyboardFunc( keyboard );
glutSpecialFunc( special );
glutMainLoop();
return 0;
}