// takes a screen shot and saves it to a TGA image
int tgaGrabScreenSeries(char *filename, int x, int y, int w, int h) {
unsigned char *imageData;
// allocate memory for the pixels
imageData = (unsigned char *)malloc(sizeof(unsigned char)* w * h * 4);
// read the pixels from the frame buffer
glReadPixels(x, y, w, h, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)imageData);
// save the image
return(tgaSaveSeries(filename, w, h, 32, imageData));
}
// takes a screen shot and saves it to a TGA image
int tgaGrabScreenSeries(char *filename, int xmin, int ymin, int xmax, int ymax) {
int w, h;
unsigned char *imageData;
// compute width and heidth of the image
w = xmax - xmin;
h = ymax - ymin;
// allocate memory for the pixels
imageData = (unsigned char *)malloc(sizeof(unsigned char)* w * h * 4);
// read the pixels from the frame buffer
glReadPixels(xmin, ymin, xmax, ymax, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) imageData);
// save the image
return(tgaSaveSeries(filename, w, h, 32, imageData));
}
int terrainSaveAsTGA(char *filename) {
unsigned char *imageData,point;
int totalPoints,status,mode,i;
float min,max;
if (terrainHeights == NULL)
return TERRAIN_ERROR_NOT_INITIALISED;
if (terrainColors == NULL)
mode = 1;
else
mode = 4;
totalPoints = terrainGridWidth * terrainGridLength;
min = terrainHeights[0];
max = terrainHeights[0];
for(i=1;i < totalPoints ; i++) {
if (terrainHeights[i] > max)
max = terrainHeights[i];
if (terrainHeights[i] < min)
min = terrainHeights[i];
}
imageData = (unsigned char *)malloc(sizeof(unsigned char) * totalPoints*mode);
for(i=0;i < totalPoints; i++) {
if (mode > 1) {
imageData[i*mode] = (unsigned char)(terrainColors[i*(mode-1)])*256;
imageData[i*mode+1] = (unsigned char)(terrainColors[i*(mode-1)+1])*256;
imageData[i*mode+2] = (unsigned char)(terrainColors[i*(mode-1)+2])*256;
}
point = (unsigned char)((terrainHeights[i] - min) / (max-min) * 255.0);
imageData[i*mode + mode-1] = point;
}
status = tgaSaveSeries(filename,terrainGridWidth,terrainGridLength, mode*8, imageData);
if (status==TGA_OK)
return(TERRAIN_OK);
else
return(TERRAIN_ERROR_NOT_SAVED);
}
