194 lines
3.9 KiB
C
194 lines
3.9 KiB
C
/*
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* Example of using the 1.1 texture object functions.
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* Also, this demo utilizes Mesa's fast texture map path.
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*
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* Brian Paul June 1996
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <GL/glx.h>
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#include <GL/gl.h>
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#include "ui.h"
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static GLuint TexObj[2];
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static GLfloat Angle = 0.0f;
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static int cnt=0,v=0;
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void
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draw(void)
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{
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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glColor3f(1.0, 1.0, 1.0);
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/* draw first polygon */
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glPushMatrix();
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glTranslatef(-1.0, 0.0, 0.0);
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glRotatef(Angle, 0.0, 0.0, 1.0);
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glBindTexture(GL_TEXTURE_2D, TexObj[v]);
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glEnable(GL_TEXTURE_2D);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0, 0.0);
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glVertex2f(-1.0, -1.0);
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glTexCoord2f(1.0, 0.0);
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glVertex2f(1.0, -1.0);
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glTexCoord2f(1.0, 1.0);
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glVertex2f(1.0, 1.0);
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glTexCoord2f(0.0, 1.0);
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glVertex2f(-1.0, 1.0);
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glEnd();
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glDisable(GL_TEXTURE_2D);
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glPopMatrix();
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/* draw second polygon */
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glPushMatrix();
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glTranslatef(1.0, 0.0, 0.0);
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glRotatef(Angle - 90.0, 0.0, 1.0, 0.0);
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glBindTexture(GL_TEXTURE_2D, TexObj[1-v]);
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glEnable(GL_TEXTURE_2D);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0, 0.0);
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glVertex2f(-1.0, -1.0);
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glTexCoord2f(1.0, 0.0);
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glVertex2f(1.0, -1.0);
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glTexCoord2f(1.0, 1.0);
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glVertex2f(1.0, 1.0);
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glTexCoord2f(0.0, 1.0);
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glVertex2f(-1.0, 1.0);
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glEnd();
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glDisable(GL_TEXTURE_2D);
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glPopMatrix();
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tkSwapBuffers();
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}
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/* new window size or exposure */
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void
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reshape(int width, int height)
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{
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glViewport(0, 0, (GLint) width, (GLint) height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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/* glOrtho( -3.0, 3.0, -3.0, 3.0, -10.0, 10.0 ); */
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glFrustum(-2.0, 2.0, -2.0, 2.0, 6.0, 20.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -8.0);
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}
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void bind_texture(int texobj,int image)
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{
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static int width = 8, height = 8;
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static int color[2][3]={
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{255,0,0},
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{0,255,0},
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};
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GLubyte tex[64][3];
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static GLubyte texchar[2][8*8] = {
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{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 0, 0, 0,
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0, 0, 0, 0, 1, 0, 0, 0,
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0, 0, 0, 0, 1, 0, 0, 0,
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0, 0, 0, 0, 1, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0},
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{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 2, 2, 0, 0, 0,
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0, 0, 2, 0, 0, 2, 0, 0,
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0, 0, 0, 0, 0, 2, 0, 0,
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0, 0, 0, 0, 2, 0, 0, 0,
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0, 0, 0, 2, 0, 0, 0, 0,
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0, 0, 2, 2, 2, 2, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0}};
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int i,j;
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glBindTexture(GL_TEXTURE_2D, texobj);
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/* red on white */
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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int p = i * width + j;
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if (texchar[image][(height - i - 1) * width + j]) {
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tex[p][0] = color[image][0];
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tex[p][1] = color[image][1];
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tex[p][2] = color[image][2];
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} else {
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tex[p][0] = 255;
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tex[p][1] = 255;
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tex[p][2] = 255;
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}
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}
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}
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glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0,
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GL_RGB, GL_UNSIGNED_BYTE, tex);
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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_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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/* end of texture object */
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}
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void
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init(void)
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{
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glEnable(GL_DEPTH_TEST);
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/* Setup texturing */
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
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/* generate texture object IDs */
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glGenTextures(2, TexObj);
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bind_texture(TexObj[0],0);
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bind_texture(TexObj[1],1);
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}
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void
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idle(void)
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{
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Angle += 2.0;
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if (++cnt==5) {
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cnt=0;
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v=!v;
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}
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draw();
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}
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/* change view angle, exit upon ESC */
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GLenum key(int k, GLenum mask)
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{
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switch (k) {
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case 'q':
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case KEY_ESCAPE:
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exit(0);
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}
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return GL_FALSE;
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}
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int main(int argc, char **argv)
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{
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return ui_loop(argc, argv, "texobj");
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}
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