tga & normals

[csRadar.git] / csrTga.h

diff --git a/csrTga.h b/csrTga.h
new file mode 100644 (file)
index 0000000..c3fbd5b
--- /dev/null
+++ b/csrTga.h
@@ -0,0 +1,62 @@
+#pragma pack(push, 1)
+struct tga_header 
+{
+       char  idlength;
+       char  colourmaptype;
+       char  datatypecode;
+       short int colourmaporigin;
+       short int colourmaplength;
+       char  colourmapdepth;
+       short int x_origin;
+       short int y_origin;
+       short width;
+       short height;
+       char  bitsperpixel;
+       char  imagedescriptor;
+};
+#pragma pack(pop)
+
+// Requires RGBA data. Can write grayscale (comp=1), RGB (comp=3) or RGBA (comp=4)
+int csr_tga_write( const char *path, u32 width, u32 height, int comp, u8 *rgba )
+{
+       FILE *fp = fopen( path, "wb" );
+
+       if( fp )
+       {
+               struct tga_header header =
+               {
+                       .datatypecode = 2,
+                       .width = width,
+                       .height = height,
+                       .bitsperpixel = comp * 8,
+                       .imagedescriptor = 0x20
+               };
+
+               fwrite( &header, sizeof( struct tga_header ), 1, fp );
+
+               for( u32 i = 0; i < width * height; i ++ )
+               {
+                       u8 *colour = rgba + i*4;                        
+                       u8 flipped[4];
+
+                       if( comp >= 3 )
+                       {                               
+                               flipped[0] = colour[2];
+                               flipped[1] = colour[1];
+                               flipped[2] = colour[0];
+                               flipped[3] = colour[3];
+                               
+                               colour = flipped;
+                       }
+                       
+                       fwrite( colour, 1, comp, fp );
+               }
+
+               fclose( fp );
+               return 1;
+       }
+       else
+       {
+               return 0;
+       }
+}