Loading and animating mario textures from rom

src/load_tex_data.c

@@ -0,0 +1,55 @@
+#include "load_tex_data.h"
+
+#include <stddef.h>
+#include <string.h>
+
+#include "tools/libmio0.h"
+#include "tools/n64graphics.h"
+
+uint8_t *gLibSm64TextureRgba;
+
+#define MARIO_TEX_ROM_OFFSET 1132368
+#define NUM_USED_TEXTURES 11
+#define ATLAS_WIDTH (NUM_USED_TEXTURES * 64)
+#define ATLAS_HEIGHT 64
+
+static int mario_tex_offsets[NUM_USED_TEXTURES] = { 144, 4240, 6288, 8336, 10384, 12432, 14480, 16528, 30864, 32912, 37008 };
+static int mario_tex_widths [NUM_USED_TEXTURES] = { 64, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32 };
+static int mario_tex_heights[NUM_USED_TEXTURES] = { 32, 32, 32, 32, 32, 32, 32, 32, 32, 64, 64 };
+
+static void blt_image_to_atlas( rgba *img, int i, int w, int h )
+{
+    for( int iy = 0; iy < h; ++iy )
+    for( int ix = 0; ix < w; ++ix )
+    {
+        int o = (ix + 64 * i) + iy * ATLAS_WIDTH;
+        int q = ix + iy * w;
+        gLibSm64TextureRgba[4*o + 0] = img[q].red;
+        gLibSm64TextureRgba[4*o + 1] = img[q].green;
+        gLibSm64TextureRgba[4*o + 2] = img[q].blue;
+        gLibSm64TextureRgba[4*o + 3] = img[q].alpha;
+    }
+}
+
+void load_mario_textures_from_rom( uint8_t *rom )
+{
+    gLibSm64TextureRgba = malloc( 4 * ATLAS_WIDTH * ATLAS_HEIGHT );
+    memset( gLibSm64TextureRgba, 0, 4 * ATLAS_WIDTH * ATLAS_HEIGHT );
+
+    mio0_header_t head;
+    uint8_t *in_buf = rom + MARIO_TEX_ROM_OFFSET;
+
+    mio0_decode_header( in_buf, &head );
+    uint8_t *out_buf = malloc( head.dest_size );
+    int bytes_read = mio0_decode( in_buf, out_buf, NULL );
+
+    for( int i = 0; i < NUM_USED_TEXTURES; ++i )
+    {
+        uint8_t *raw = out_buf + mario_tex_offsets[i];
+        rgba *img = raw2rgba( raw, mario_tex_widths[i], mario_tex_heights[i], 16 );
+        blt_image_to_atlas( img, i, mario_tex_widths[i], mario_tex_heights[i] );
+        free( img );
+    }
+
+    free( out_buf );
+}