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