add unmodified version of TinyRenderer, a 500 line software renderer with vertex and pixel shaders, texture mapping and Wavefront .obj support.

examples/TinyRenderer/tgaimage.h

@@ -0,0 +1,98 @@
+#ifndef __IMAGE_H__
+#define __IMAGE_H__
+
+#include <fstream>
+
+#pragma pack(push,1)
+struct TGA_Header {
+    char idlength;
+    char colormaptype;
+    char datatypecode;
+    short colormaporigin;
+    short colormaplength;
+    char colormapdepth;
+    short x_origin;
+    short y_origin;
+    short width;
+    short height;
+    char  bitsperpixel;
+    char  imagedescriptor;
+};
+#pragma pack(pop)
+
+struct TGAColor {
+    unsigned char bgra[4];
+    unsigned char bytespp;
+
+    TGAColor() : bgra(), bytespp(1) {
+        for (int i=0; i<4; i++) bgra[i] = 0;
+    }
+
+    TGAColor(unsigned char R, unsigned char G, unsigned char B, unsigned char A=255) : bgra(), bytespp(4) {
+        bgra[0] = B;
+        bgra[1] = G;
+        bgra[2] = R;
+        bgra[3] = A;
+    }
+
+    TGAColor(unsigned char v) : bgra(), bytespp(1) {
+        for (int i=0; i<4; i++) bgra[i] = 0;
+        bgra[0] = v;
+    }
+
+
+    TGAColor(const unsigned char *p, unsigned char bpp) : bgra(), bytespp(bpp) {
+        for (int i=0; i<(int)bpp; i++) {
+            bgra[i] = p[i];
+        }
+        for (int i=bpp; i<4; i++) {
+            bgra[i] = 0;
+        }
+    }
+
+    unsigned char& operator[](const int i) { return bgra[i]; }
+
+    TGAColor operator *(float intensity) const {
+        TGAColor res = *this;
+        intensity = (intensity>1.f?1.f:(intensity<0.f?0.f:intensity));
+        for (int i=0; i<4; i++) res.bgra[i] = bgra[i]*intensity;
+        return res;
+    }
+};
+
+class TGAImage {
+protected:
+    unsigned char* data;
+    int width;
+    int height;
+    int bytespp;
+
+    bool   load_rle_data(std::ifstream &in);
+    bool unload_rle_data(std::ofstream &out);
+public:
+    enum Format {
+        GRAYSCALE=1, RGB=3, RGBA=4
+    };
+
+    TGAImage();
+    TGAImage(int w, int h, int bpp);
+    TGAImage(const TGAImage &img);
+    bool read_tga_file(const char *filename);
+    bool write_tga_file(const char *filename, bool rle=true);
+    bool flip_horizontally();
+    bool flip_vertically();
+    bool scale(int w, int h);
+    TGAColor get(int x, int y);
+    bool set(int x, int y, TGAColor &c);
+    bool set(int x, int y, const TGAColor &c);
+    ~TGAImage();
+    TGAImage & operator =(const TGAImage &img);
+    int get_width();
+    int get_height();
+    int get_bytespp();
+    unsigned char *buffer();
+    void clear();
+};
+
+#endif //__IMAGE_H__
+