355 lines
7.9 KiB
C
355 lines
7.9 KiB
C
/*
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* GL_ARB_multitexture demo
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*
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* Command line options:
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* -info print GL implementation information
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*
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*
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* Brian Paul November 1998 This program is in the public domain.
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* Modified on 12 Feb 2002 for > 2 texture units.
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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#include "readtex.h"
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#define TEXTURE_1_FILE "../images/girl.rgb"
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#define TEXTURE_2_FILE "../images/reflect.rgb"
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#define TEX0 1
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#define TEX7 8
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#define ANIMATE 10
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#define QUIT 100
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static GLboolean Animate = GL_TRUE;
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static GLint NumUnits = 1;
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static GLboolean TexEnabled[8];
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static GLfloat Drift = 0.0;
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static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
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static void Idle( void )
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{
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if (Animate) {
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GLint i;
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Drift = glutGet(GLUT_ELAPSED_TIME) * 0.001;
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for (i = 0; i < NumUnits; i++) {
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glActiveTextureARB(GL_TEXTURE0_ARB + i);
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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if (i == 0) {
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glTranslatef(Drift, 0.0, 0.0);
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glScalef(2, 2, 1);
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}
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else if (i == 1) {
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glTranslatef(0.0, Drift, 0.0);
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}
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else {
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float tx = 0.5, ty = 0.5;
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glTranslatef(tx, ty, 0.0);
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glRotatef(180.0 * Drift, 0, 0, 1);
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glScalef(1.0/i, 1.0/i, 1.0/i);
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glTranslatef(-tx, -ty + i * 0.1, 0.0);
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}
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}
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glMatrixMode(GL_MODELVIEW);
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glutPostRedisplay();
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}
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}
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static void DrawObject(void)
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{
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static const GLfloat tex_coords[] = { 0.0, 0.0, 1.0, 1.0, 0.0 };
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static const GLfloat vtx_coords[] = { -1.0, -1.0, 1.0, 1.0, -1.0 };
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GLint i, j;
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if (!TexEnabled[0] && !TexEnabled[1])
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glColor3f(0.1, 0.1, 0.1); /* add onto this */
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else
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glColor3f(1, 1, 1); /* modulate this */
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glBegin(GL_QUADS);
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for (j = 0; j < 4; j++ ) {
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for (i = 0; i < NumUnits; i++) {
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if (TexEnabled[i])
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glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i,
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tex_coords[j], tex_coords[j+1]);
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}
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glVertex2f( vtx_coords[j], vtx_coords[j+1] );
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}
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glEnd();
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}
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static void Display( void )
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{
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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(5.0, 5.0, 5.0);
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DrawObject();
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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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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
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/*glOrtho( -6.0, 6.0, -6.0, 6.0, 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, -70.0 );
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}
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static void ToggleUnit(int unit)
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{
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TexEnabled[unit] = !TexEnabled[unit];
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glActiveTextureARB(GL_TEXTURE0_ARB + unit);
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if (TexEnabled[unit])
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glEnable(GL_TEXTURE_2D);
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else
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glDisable(GL_TEXTURE_2D);
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printf("Enabled: ");
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for (unit = 0; unit < NumUnits; unit++)
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printf("%d ", (int) TexEnabled[unit]);
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printf("\n");
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}
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static void ModeMenu(int entry)
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{
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if (entry >= TEX0 && entry <= TEX7) {
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/* toggle */
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GLint i = entry - TEX0;
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ToggleUnit(i);
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}
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else if (entry==ANIMATE) {
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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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}
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else if (entry==QUIT) {
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exit(0);
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}
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glutPostRedisplay();
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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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Animate = !Animate;
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break;
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case '0':
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ToggleUnit(0);
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break;
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case '1':
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ToggleUnit(1);
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break;
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case '2':
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ToggleUnit(2);
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break;
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case '3':
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ToggleUnit(3);
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break;
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case '4':
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ToggleUnit(4);
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break;
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case '5':
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ToggleUnit(5);
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break;
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case '6':
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ToggleUnit(6);
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break;
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case '7':
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ToggleUnit(7);
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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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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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GLuint texObj[8];
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GLint size, i;
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const char *exten = (const char *) glGetString(GL_EXTENSIONS);
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if (!strstr(exten, "GL_ARB_multitexture")) {
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printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
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exit(1);
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}
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glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &NumUnits);
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printf("%d texture units supported\n", NumUnits);
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if (NumUnits > 8)
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NumUnits = 8;
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glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size);
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printf("%d x %d max texture size\n", size, size);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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for (i = 0; i < NumUnits; i++) {
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if (i < 2)
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TexEnabled[i] = GL_TRUE;
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else
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TexEnabled[i] = GL_FALSE;
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}
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/* allocate two texture objects */
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glGenTextures(NumUnits, texObj);
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/* setup the texture objects */
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for (i = 0; i < NumUnits; i++) {
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glActiveTextureARB(GL_TEXTURE0_ARB + i);
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glBindTexture(GL_TEXTURE_2D, texObj[i]);
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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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if (i == 0) {
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if (!LoadRGBMipmaps(TEXTURE_1_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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else if (i == 1) {
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if (!LoadRGBMipmaps(TEXTURE_2_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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else {
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/* checker */
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GLubyte image[8][8][3];
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GLint i, j;
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for (i = 0; i < 8; i++) {
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for (j = 0; j < 8; j++) {
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if ((i + j) & 1) {
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image[i][j][0] = 50;
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image[i][j][1] = 50;
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image[i][j][2] = 50;
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}
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else {
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image[i][j][0] = 25;
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image[i][j][1] = 25;
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image[i][j][2] = 25;
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}
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}
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}
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0,
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GL_RGB, GL_UNSIGNED_BYTE, (GLvoid *) image);
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}
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/* Bind texObj[i] to ith texture unit */
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if (i < 2)
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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else
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
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if (TexEnabled[i])
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glEnable(GL_TEXTURE_2D);
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}
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glShadeModel(GL_FLAT);
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glClearColor(0.3, 0.3, 0.4, 1.0);
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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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}
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int main( int argc, char *argv[] )
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{
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GLint i;
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glutInit( &argc, argv );
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glutInitWindowSize( 300, 300 );
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glutInitWindowPosition( 0, 0 );
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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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glutCreateMenu(ModeMenu);
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for (i = 0; i < NumUnits; i++) {
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char s[100];
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sprintf(s, "Toggle Texture %d", i);
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glutAddMenuEntry(s, TEX0 + i);
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}
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glutAddMenuEntry("Toggle Animation", ANIMATE);
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glutAddMenuEntry("Quit", QUIT);
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glutAttachMenu(GLUT_RIGHT_BUTTON);
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glutMainLoop();
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return 0;
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}
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