Attachment 22824 Details for Bug 20038 – mesa texobj demo without idle function

[patch] mesa texobj demo without idle function

texobj.c (text/plain), 6.71 KB, created by David Reveman on 2009-02-11 07:19:26 UTC

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Creator: David Reveman

Created: 2009-02-11 07:19:26 UTC

Size: 6.71 KB

patch

obsolete

>
>/*
> * Example of using the 1.1 texture object functions.
> * Also, this demo utilizes Mesa's fast texture map path.
> *
> * Brian Paul   June 1996   This file is in the public domain.
> */
>
>#include <assert.h>
>#include <math.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include "GL/glut.h"
>
>static GLuint Window = 0;
>
>static GLuint TexObj[2];
>static GLfloat Angle = 0.0f;
>static GLboolean UseObj = GL_FALSE;
>
>
>#if defined(GL_VERSION_1_1) || defined(GL_VERSION_1_2)
>#  define TEXTURE_OBJECT 1
>#elif defined(GL_EXT_texture_object)
>#  define TEXTURE_OBJECT 1
>#  define glBindTexture(A,B)     glBindTextureEXT(A,B)
>#  define glGenTextures(A,B)     glGenTexturesEXT(A,B)
>#  define glDeleteTextures(A,B)  glDeleteTexturesEXT(A,B)
>#endif
>
>
>
>
>static void draw( void )
>{
>   glClear( GL_COLOR_BUFFER_BIT );
>
>   glColor3f( 1.0, 1.0, 1.0 );
>
>   /* draw first polygon */
>   glPushMatrix();
>   glTranslatef( -1.0, 0.0, 0.0 );
>   glRotatef( Angle, 0.0, 0.0, 1.0 );
>   if (UseObj) {
>#ifdef TEXTURE_OBJECT
>      glBindTexture( GL_TEXTURE_2D, TexObj[0] );
>#endif
>   }
>   else {
>      glCallList( TexObj[0] );
>   }
>   glBegin( GL_POLYGON );
>   glTexCoord2f( 0.0, 0.0 );   glVertex2f( -1.0, -1.0 );
>   glTexCoord2f( 1.0, 0.0 );   glVertex2f(  1.0, -1.0 );
>   glTexCoord2f( 1.0, 1.0 );   glVertex2f(  1.0,  1.0 );
>   glTexCoord2f( 0.0, 1.0 );   glVertex2f( -1.0,  1.0 );
>   glEnd();
>   glPopMatrix();
>
>   /* draw second polygon */
>   glPushMatrix();
>   glTranslatef( 1.0, 0.0, 0.0 );
>   glRotatef( Angle-90.0, 0.0, 1.0, 0.0 );
>   if (UseObj) {
>#ifdef TEXTURE_OBJECT
>      glBindTexture( GL_TEXTURE_2D, TexObj[1] );
>#endif
>   }
>   else {
>      glCallList( TexObj[1] );
>   }
>   glBegin( GL_POLYGON );
>   glTexCoord2f( 0.0, 0.0 );   glVertex2f( -1.0, -1.0 );
>   glTexCoord2f( 1.0, 0.0 );   glVertex2f(  1.0, -1.0 );
>   glTexCoord2f( 1.0, 1.0 );   glVertex2f(  1.0,  1.0 );
>   glTexCoord2f( 0.0, 1.0 );   glVertex2f( -1.0,  1.0 );
>   glEnd();
>   glPopMatrix();
>
>   glutSwapBuffers();
>}
>
>
>
>static void idle( void )
>{
>   static double t0 = -1.;
>   double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
>   if (t0 < 0.0)
>      t0 = t;
>   dt = t - t0;
>   t0 = t;
>   Angle += 120.0*dt;
>   glutPostRedisplay();
>}
>
>
>
>/* change view Angle, exit upon ESC */
>static void key(unsigned char k, int x, int y)
>{
>   (void) x;
>   (void) y;
>   switch (k) {
>      case 27:
>#ifdef TEXTURE_OBJECT
>         glDeleteTextures( 2, TexObj );
>#endif
>         glutDestroyWindow(Window);
>         exit(0);
>   }
>}
>
>
>
>/* new window size or exposure */
>static void reshape( int width, int height )
>{
>   glViewport(0, 0, (GLint)width, (GLint)height);
>   glMatrixMode(GL_PROJECTION);
>   glLoadIdentity();
>   /*   glOrtho( -3.0, 3.0, -3.0, 3.0, -10.0, 10.0 );*/
>   glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
>   glMatrixMode(GL_MODELVIEW);
>   glLoadIdentity();
>   glTranslatef( 0.0, 0.0, -8.0 );
>}
>
>
>static void init( void )
>{
>   static int width=8, height=8;
>   static GLubyte tex1[] = {
>     0, 0, 0, 0, 0, 0, 0, 0,
>     0, 0, 0, 0, 1, 0, 0, 0,
>     0, 0, 0, 1, 1, 0, 0, 0,
>     0, 0, 0, 0, 1, 0, 0, 0,
>     0, 0, 0, 0, 1, 0, 0, 0,
>     0, 0, 0, 0, 1, 0, 0, 0,
>     0, 0, 0, 1, 1, 1, 0, 0,
>     0, 0, 0, 0, 0, 0, 0, 0 };
>
>   static GLubyte tex2[] = {
>     0, 0, 0, 0, 0, 0, 0, 0,
>     0, 0, 0, 2, 2, 0, 0, 0,
>     0, 0, 2, 0, 0, 2, 0, 0,
>     0, 0, 0, 0, 0, 2, 0, 0,
>     0, 0, 0, 0, 2, 0, 0, 0,
>     0, 0, 0, 2, 0, 0, 0, 0,
>     0, 0, 2, 2, 2, 2, 0, 0,
>     0, 0, 0, 0, 0, 0, 0, 0 };
>
>   GLubyte tex[64][3];
>   GLint i, j;
>
>
>   glDisable( GL_DITHER );
>
>   /* Setup texturing */
>   glEnable( GL_TEXTURE_2D );
>   glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
>   glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST );
>
>
>   /* generate texture object IDs */
>   if (UseObj) {
>#ifdef TEXTURE_OBJECT
>      glGenTextures( 2, TexObj );
>#endif
>   }
>   else {
>      TexObj[0] = glGenLists(2);
>      TexObj[1] = TexObj[0]+1;
>   }
>
>   /* setup first texture object */
>   if (UseObj) {
>#ifdef TEXTURE_OBJECT
>      glBindTexture( GL_TEXTURE_2D, TexObj[0] );
>      assert(glIsTexture(TexObj[0]));
>#endif
>   }
>   else {
>      glNewList( TexObj[0], GL_COMPILE );
>   }
>   /* red on white */
>   for (i=0;i<height;i++) {
>      for (j=0;j<width;j++) {
>         int p = i*width+j;
>         if (tex1[(height-i-1)*width+j]) {
>            tex[p][0] = 255;   tex[p][1] = 0;     tex[p][2] = 0;
>         }
>         else {
>            tex[p][0] = 255;   tex[p][1] = 255;   tex[p][2] = 255;
>         }
>      }
>   }
>
>   glTexImage2D( GL_TEXTURE_2D, 0, 3, width, height, 0,
>                 GL_RGB, GL_UNSIGNED_BYTE, tex );
>   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_REPEAT );
>   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
>   if (!UseObj) {
>      glEndList();
>   }
>   /* end of texture object */
>
>   /* setup second texture object */
>   if (UseObj) {
>#ifdef TEXTURE_OBJECT
>      glBindTexture( GL_TEXTURE_2D, TexObj[1] );
>      assert(glIsTexture(TexObj[1]));
>#endif
>      assert(!glIsTexture(TexObj[1] + 999));
>   }
>   else {
>      glNewList( TexObj[1], GL_COMPILE );
>   }
>   /* green on blue */
>   for (i=0;i<height;i++) {
>      for (j=0;j<width;j++) {
>         int p = i*width+j;
>         if (tex2[(height-i-1)*width+j]) {
>            tex[p][0] = 0;     tex[p][1] = 255;   tex[p][2] = 0;
>         }
>         else {
>            tex[p][0] = 0;     tex[p][1] = 0;     tex[p][2] = 255;
>         }
>      }
>   }
>   glTexImage2D( GL_TEXTURE_2D, 0, 3, width, height, 0,
>                 GL_RGB, GL_UNSIGNED_BYTE, tex );
>   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_REPEAT );
>   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
>   if (!UseObj) {
>      glEndList();
>   }
>   /* end texture object */
>
>}
>
>
>
>int main( int argc, char *argv[] )
>{
>   glutInit(&argc, argv);
>   glutInitWindowPosition(0, 0);
>   glutInitWindowSize(300, 300);
>   glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
>
>   Window = glutCreateWindow("Texture Objects");
>   if (!Window) {
>      exit(1);
>   }
>
>   /* check that renderer has the GL_EXT_texture_object extension
>    * or supports OpenGL 1.1
>    */
>#ifdef TEXTURE_OBJECT
>   {
>      char *exten = (char *) glGetString( GL_EXTENSIONS );
>      char *version = (char *) glGetString( GL_VERSION );
>      if (   strstr( exten, "GL_EXT_texture_object" )
>          || strncmp( version, "1.1", 3 )==0
>          || strncmp( version, "1.2", 3 )==0 ) {
>         UseObj = GL_TRUE;
>      }
>   }
>#endif
>
>   init();
>
>   glutReshapeFunc( reshape );
>   glutKeyboardFunc( key );
>//   glutIdleFunc( idle );
>   glutDisplayFunc( draw );
>   glutMainLoop();
>   return 0;
>}

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Attachments on bug 20038: 22755 | 22756 | 22760 | 22761 | 22762 | 22763 | 22764 | 22824

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