// ************************************************************
void RTTexture::LoadFile(char *filename) {
if(pixels != NULL) {
delete pixels;
pixels = NULL;
}
pixels = readPPMfile(filename, &iWidth, &iHeight);
}
void initTextures(void) {
/* read in image for texture */
grid = readPPMfile("grid.ppm");
/* create a texture object */
glGenTextures(1,&gridTex);
/* make it the current texture */
glBindTexture(GL_TEXTURE_2D,gridTex);
/* make it wrap around */
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_REPEAT);
/* make it filter nicely */
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
/* and put the image data into the texure object */
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,128,128,0,
GL_RGB,GL_UNSIGNED_BYTE,grid);
}
/*
* Draws the plant.
*
* ADD YOUR CODE and modify the function to take an L-system depth and
* any other necessary arguments.
*/
void drawTree(int depth) {
srand(randomSeed);
glDepthMask(GL_FALSE); // disable z buffer before drawing ppm file
int w;
int h;
GLubyte *pixels = readPPMfile("mountains.ppm", &w, &h);
glDrawPixels(w, h, GL_RGB, GL_UNSIGNED_BYTE, pixels);
glDepthMask(GL_TRUE); // reenable z buffer
scaleFactor = depth;
pushMatrix();
initialize();
centerBranch(depth);
popMatrix();
} // drawPlant
void display() {
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw Background
int pic_w, pic_h;
GLubyte* img = readPPMfile ("apple.ppm", &pic_w, &pic_h);
glRasterPos3f (-40.0f, -10.0f, -40.0f);
glDrawPixels (pic_w, pic_h, GL_RGB, GL_UNSIGNED_BYTE, img);
/* See drawplant.c for the definition of this routine */
drawPlant(_iterations, 10.0f);
glFlush(); /* Flush all executed OpenGL ops finish */
/*
* Since we are using double buffers, we need to call the swap
* function every time we are done drawing.
*/
glutSwapBuffers();
}
