textured line test

progs/tests/texline.c

@@ -0,0 +1,196 @@
+/* $Id: texline.c,v 1.1 2000/09/30 18:48:33 brianp 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_TRUE;
+static GLboolean Texture = GL_TRUE;
+static GLfloat LineWidth = 1.0;
+
+static GLfloat Xrot = -60.0, Yrot = 0.0, Zrot = 0.0;
+static GLfloat DYrot = 1.0;
+
+
+static void Idle( void )
+{
+   if (Animate) {
+      Zrot += DYrot;
+      glutPostRedisplay();
+   }
+}
+
+
+static void Display( void )
+{
+   GLfloat x, 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);
+
+   glColor3f(1, 1, 1);
+   glBegin(GL_LINES);
+   for (t = 0.0; t <= 1.0; t += 0.0125) {
+      x = t * 2.0 - 1.0;
+      glTexCoord2f(t, 0.0);  glVertex2f(x, -1.0);
+      glTexCoord2f(t, 1.0);  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_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+         }
+         else {
+            glDisable(GL_LINE_SMOOTH);
+            glDisable(GL_BLEND);
+         }
+         break;
+      case 't':
+         Texture = !Texture;
+         if (Texture)
+            glEnable(GL_TEXTURE_2D);
+         else
+            glDisable(GL_TEXTURE_2D);
+         break;
+      case 'w':
+         LineWidth -= 0.25;
+         if (LineWidth < 0.25)
+            LineWidth = 0.25;
+         glLineWidth(LineWidth);
+         break;
+      case 'W':
+         LineWidth += 0.25;
+         if (LineWidth > 8.0)
+            LineWidth = 8.0;
+         glLineWidth(LineWidth);
+         break;
+      case ' ':
+         Animate = !Animate;
+         if (Animate)
+            glutIdleFunc(Idle);
+         else
+            glutIdleFunc(NULL);
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   printf("Width %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[] )
+{
+   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);
+
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
+      printf("Error: couldn't load texture image\n");
+      exit(1);
+   }
+
+   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 );
+   glutInitWindowSize( 400, 300 );
+
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+
+   glutCreateWindow(argv[0] );
+
+   Init(argc, argv);
+
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutSpecialFunc( SpecialKey );
+   glutDisplayFunc( Display );
+   glutIdleFunc( Idle );
+
+   glutMainLoop();
+   return 0;
+}