| /* $Id: texline.c,v 1.5 2004/01/28 10:07:48 keithw Exp $ */ |
| |
| /* |
| * Test textured lines. |
| * |
| * Brian Paul |
| * September 2000 |
| */ |
| |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glut.h> |
| #include "../util/readtex.c" /* I know, this is a hack. */ |
| |
| #define TEXTURE_FILE "../images/girl.rgb" |
| |
| static GLboolean Antialias = GL_FALSE; |
| static GLboolean Animate = GL_FALSE; |
| static GLint Texture = 1; |
| static GLboolean Stipple = GL_FALSE; |
| static GLfloat LineWidth = 1.0; |
| |
| static GLfloat Xrot = -60.0, Yrot = 0.0, Zrot = 0.0; |
| static GLfloat DYrot = 1.0; |
| static GLboolean Points = GL_FALSE; |
| static GLfloat Scale = 1.0; |
| |
| static void Idle( void ) |
| { |
| if (Animate) { |
| Zrot += DYrot; |
| glutPostRedisplay(); |
| } |
| } |
| |
| |
| static void Display( void ) |
| { |
| GLfloat x, y, s, t; |
| |
| glClear( GL_COLOR_BUFFER_BIT ); |
| |
| glPushMatrix(); |
| glRotatef(Xrot, 1.0, 0.0, 0.0); |
| glRotatef(Yrot, 0.0, 1.0, 0.0); |
| glRotatef(Zrot, 0.0, 0.0, 1.0); |
| glScalef(Scale, Scale, Scale); |
| |
| if (Texture) |
| glColor3f(1, 1, 1); |
| |
| if (Points) { |
| glBegin(GL_POINTS); |
| for (t = 0.0; t <= 1.0; t += 0.025) { |
| for (s = 0.0; s <= 1.0; s += 0.025) { |
| x = s * 2.0 - 1.0; |
| y = t * 2.0 - 1.0; |
| if (!Texture) |
| glColor3f(1, 0, 1); |
| glMultiTexCoord2fARB(GL_TEXTURE1_ARB, t, s); |
| glTexCoord2f(s, t); |
| glVertex2f(x, y); |
| } |
| } |
| glEnd(); |
| } |
| else { |
| glBegin(GL_LINES); |
| for (t = 0.0; t <= 1.0; t += 0.025) { |
| x = t * 2.0 - 1.0; |
| if (!Texture) |
| glColor3f(1, 0, 1); |
| glTexCoord2f(t, 0.0); |
| glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, t); |
| glVertex2f(x, -1.0); |
| if (!Texture) |
| glColor3f(0, 1, 0); |
| glTexCoord2f(t, 1.0); |
| glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, t); |
| glVertex2f(x, 1.0); |
| } |
| glEnd(); |
| } |
| |
| glPopMatrix(); |
| |
| glutSwapBuffers(); |
| } |
| |
| |
| static void Reshape( int width, int height ) |
| { |
| GLfloat ar = (float) width / height; |
| glViewport( 0, 0, width, height ); |
| glMatrixMode( GL_PROJECTION ); |
| glLoadIdentity(); |
| glFrustum( -ar, ar, -1.0, 1.0, 10.0, 100.0 ); |
| glMatrixMode( GL_MODELVIEW ); |
| glLoadIdentity(); |
| glTranslatef( 0.0, 0.0, -12.0 ); |
| } |
| |
| |
| static void Key( unsigned char key, int x, int y ) |
| { |
| (void) x; |
| (void) y; |
| switch (key) { |
| case 'a': |
| Antialias = !Antialias; |
| if (Antialias) { |
| glEnable(GL_LINE_SMOOTH); |
| glEnable(GL_POINT_SMOOTH); |
| glEnable(GL_BLEND); |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| } |
| else { |
| glDisable(GL_LINE_SMOOTH); |
| glDisable(GL_POINT_SMOOTH); |
| glDisable(GL_BLEND); |
| } |
| break; |
| case 't': |
| Texture++; |
| if (Texture > 2) |
| Texture = 0; |
| if (Texture == 0) { |
| glActiveTextureARB(GL_TEXTURE0_ARB); |
| glDisable(GL_TEXTURE_2D); |
| glActiveTextureARB(GL_TEXTURE1_ARB); |
| glDisable(GL_TEXTURE_2D); |
| } |
| else if (Texture == 1) { |
| glActiveTextureARB(GL_TEXTURE0_ARB); |
| glEnable(GL_TEXTURE_2D); |
| glActiveTextureARB(GL_TEXTURE1_ARB); |
| glDisable(GL_TEXTURE_2D); |
| } |
| else { |
| glActiveTextureARB(GL_TEXTURE0_ARB); |
| glEnable(GL_TEXTURE_2D); |
| glActiveTextureARB(GL_TEXTURE1_ARB); |
| glEnable(GL_TEXTURE_2D); |
| } |
| break; |
| case 'w': |
| LineWidth -= 0.25; |
| if (LineWidth < 0.25) |
| LineWidth = 0.25; |
| glLineWidth(LineWidth); |
| glPointSize(LineWidth); |
| break; |
| case 'W': |
| LineWidth += 0.25; |
| if (LineWidth > 8.0) |
| LineWidth = 8.0; |
| glLineWidth(LineWidth); |
| glPointSize(LineWidth); |
| break; |
| case 'p': |
| Points = !Points; |
| break; |
| case 's': |
| Stipple = !Stipple; |
| if (Stipple) |
| glEnable(GL_LINE_STIPPLE); |
| else |
| glDisable(GL_LINE_STIPPLE); |
| break; |
| case ' ': |
| Animate = !Animate; |
| if (Animate) |
| glutIdleFunc(Idle); |
| else |
| glutIdleFunc(NULL); |
| break; |
| case 27: |
| exit(0); |
| break; |
| } |
| printf("LineWidth, PointSize = %f\n", LineWidth); |
| glutPostRedisplay(); |
| } |
| |
| |
| static void SpecialKey( int key, int x, int y ) |
| { |
| float step = 3.0; |
| (void) x; |
| (void) y; |
| |
| switch (key) { |
| case GLUT_KEY_UP: |
| Xrot += step; |
| break; |
| case GLUT_KEY_DOWN: |
| Xrot -= step; |
| break; |
| case GLUT_KEY_LEFT: |
| Yrot += step; |
| break; |
| case GLUT_KEY_RIGHT: |
| Yrot -= step; |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Init( int argc, char *argv[] ) |
| { |
| GLuint u; |
| for (u = 0; u < 2; u++) { |
| glActiveTextureARB(GL_TEXTURE0_ARB + u); |
| glBindTexture(GL_TEXTURE_2D, 10+u); |
| if (u == 0) |
| glEnable(GL_TEXTURE_2D); |
| 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_MIN_FILTER, GL_LINEAR); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| |
| if (u == 0) |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
| else |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD); |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) { |
| printf("Error: couldn't load texture image\n"); |
| exit(1); |
| } |
| } |
| |
| glLineStipple(1, 0xff); |
| |
| if (argc > 1 && strcmp(argv[1], "-info")==0) { |
| 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)); |
| } |
| } |
| |
| |
| int main( int argc, char *argv[] ) |
| { |
| glutInit( &argc, argv ); |
| glutInitWindowPosition(0, 0); |
| glutInitWindowSize( 400, 300 ); |
| |
| glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); |
| |
| glutCreateWindow(argv[0] ); |
| |
| Init(argc, argv); |
| |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutSpecialFunc( SpecialKey ); |
| glutDisplayFunc( Display ); |
| if (Animate) |
| glutIdleFunc( Idle ); |
| |
| glutMainLoop(); |
| return 0; |
| } |