From f401289e371a76ff0dbaea40f7f94f7b85c4b2bd Mon Sep 17 00:00:00 2001
From: banana <delgadillo.tyler@gmail.com>
Date: Fri, 22 Mar 2024 13:52:05 -0700
Subject: Initial commit

---
 src/tga.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/tga.c

(limited to 'src/tga.c')

diff --git a/src/tga.c b/src/tga.c
new file mode 100644
index 0000000..95a82d6
--- /dev/null
+++ b/src/tga.c
@@ -0,0 +1,55 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void CreateTGA( char *filename, short width, short height, void *image ) {
+    
+    // create file pointer to write to
+    FILE *tga = NULL;
+
+    // write filename from func arg to buffer
+    char buffer[256];
+    if( filename ) {
+        strncpy( buffer, filename, sizeof(buffer) );
+    }
+    // if no filename is provided, set default
+    else {
+        strcpy( buffer, "img.tga" );
+    }
+
+    // open the named file for binary writing
+    tga = fopen( buffer, "wb" );
+
+    // set 'id length' field of tga header
+    fputc( 0, tga );
+    
+
+    // set 'color map type' field of tga header
+    fputc( 1, tga ); // color map present
+
+    // set 'image type' field of tga header
+    fputc( 1, tga ); // uncompressed color mapped image
+
+    // set 'color map specification' field of tga header
+    fputc( 0, tga ); fputc( 0, tga ); // 2 byte 'first entry index' subfield, index 0
+    fputc( 2, tga ); fputc( 0, tga ); // 2 byte 'color map length' subfield, 2 entries
+    fputc( 24, tga ); // 'color map entry size' subfield, 24-bit color
+
+    // set 'image specification' field of tga header
+    fputc( 0, tga ); fputc( 0, tga ); // 2 byte 'x-origin' subfield, origin 0
+    fputc( 0, tga ); fputc( 0, tga ); // 2 byte 'y-origin' subfield, origin 0
+    fputc( width & 0xff, tga ); fputc( width >> 8, tga ); // 2 byte 'width' subfield, set by function argument 'w'
+    fputc( height & 0xff, tga ); fputc( height >> 8, tga ); // 2 byte 'height' subfield, set by function argument 'h'
+    fputc( 8, tga ); // 'pixel depth' subfield, 8 bits per pixel
+    fputc( 0x20, tga ); // 'image descriptor' subfield, bit 5 set, indicating top-to-bottom, left-to-right order
+    
+    // set 'image and color map data' field
+    fputc( 0xff, tga ); fputc( 0xff, tga ); fputc( 0xff, tga ); // set first color map entry, 0xffffff
+    fputc( 0x00, tga ); fputc( 0x00, tga ); fputc( 0x00, tga ); // set second color map entry, 0x000000
+
+    // write image data
+    fwrite( image, 1, (width * height), tga );
+
+    fclose( tga );
+}
-- 
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