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TGA files
Author
In tutorial 32 it explains how to make TGA files. I couldn't follow this expination and was wondering if anyone could explain it a little better for me?
Is there anything specific you had trouble with? I have recently been through that tutorial myself. It's actually number 33, yes?
Author
I can't figure out how to make the image itself. I don't understand the transparency, ect...
Here's some C++ code to output a sample TGA with transparency, using the information on Paul Bourke's website:
#include <fstream>using std::ofstream;using std::endl;#include <ios>using std::ios_base;int main(void){ // Assumes char is 1 byte, short is 2 bytes. char temp_c = 0; short temp_s = 0; ofstream out("test.tga", ios_base::binary); temp_c = 0; out.write(&temp_c, sizeof(temp_c)); // idlength out.write(&temp_c, sizeof(temp_c)); // colourmaptype temp_c = 2; out.write(&temp_c, sizeof(temp_c)); // datatypecode (2 == uncompressed RGB(A) data) temp_s = 0; out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // colourmaporigin out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // colourmaplength temp_c = 0; out.write(&temp_c, sizeof(temp_c)); // colourmapdepth temp_s = 0; out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // x_origin out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // y_origin temp_s = 128; out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // width (128 pixels wide) temp_s = 64; out.write(reinterpret_cast<const char *>(&temp_s), sizeof(temp_s)); // height (64 pixels tall) temp_c = 32; out.write(&temp_c, sizeof(temp_c)); // bitsperpixel (32 bits per pixel) temp_c = 0; out.write(&temp_c, sizeof(temp_c)); // imagedescriptor unsigned char r = 0; unsigned char g = 0; unsigned char b = 128; unsigned char a = 0; // output 128*64*4 bytes of data for(short y = 0; y < 64; y++) { // For each line: r += 2; // Increase red by 2 g = 0; // Reset green to 0 a = 255; // Reset alpha to 255 (fully opaque) for(short x = 0; x < 128; x++) { // For each pixel in each line: g++; // Increase green by 1 a--; // Decrease alpha by 1 out.write(reinterpret_cast<const char *>(&r), sizeof(r)); out.write(reinterpret_cast<const char *>(&g), sizeof(g)); out.write(reinterpret_cast<const char *>(&b), sizeof(b)); out.write(reinterpret_cast<const char *>(&a), sizeof(a)); } } return 0;}This topic is closed to new replies.
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