Added asset mods support

lib/n64graphics/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.12)
+project(N64Graphics)
+
+set(CMAKE_CXX_STANDARD 20)
+
+file(GLOB CXX_FILES ${CMAKE_CURRENT_SOURCE_DIR}/*.c)
+set(SRC_DIR ${CXX_FILES})
+
+add_library(${PROJECT_NAME} STATIC ${SRC_DIR})
+target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

lib/n64graphics/n64graphics.h

@@ -0,0 +1,100 @@
+#ifndef N64GRAPHICS_H_
+#define N64GRAPHICS_H_
+
+#include <stdint.h>
+
+// intermediate formats
+typedef struct _rgba
+{
+   uint8_t red;
+   uint8_t green;
+   uint8_t blue;
+   uint8_t alpha;
+} rgba;
+
+typedef struct _ia
+{
+   uint8_t intensity;
+   uint8_t alpha;
+} ia;
+
+// CI palette
+typedef struct
+{
+   uint16_t data[256];
+   int max; // max number of entries
+   int used; // number of entries used
+} palette_t;
+
+//---------------------------------------------------------
+// N64 RGBA/IA/I/CI -> intermediate RGBA/IA
+//---------------------------------------------------------
+
+// N64 raw RGBA16/RGBA32 -> intermediate RGBA
+rgba *raw2rgba(const uint8_t *raw, int width, int height, int depth);
+
+// N64 raw IA1/IA4/IA8/IA16 -> intermediate IA
+ia *raw2ia(const uint8_t *raw, int width, int height, int depth);
+
+// N64 raw I4/I8 -> intermediate IA
+ia *raw2i(const uint8_t *raw, int width, int height, int depth);
+
+//---------------------------------------------------------
+// intermediate RGBA/IA -> N64 RGBA/IA/I/CI
+// returns length written to 'raw' used or -1 on error
+//---------------------------------------------------------
+
+// intermediate RGBA -> N64 raw RGBA16/RGBA32
+int rgba2raw(uint8_t *raw, const rgba *img, int width, int height, int depth);
+
+// intermediate IA -> N64 raw IA1/IA4/IA8/IA16
+int ia2raw(uint8_t *raw, const ia *img, int width, int height, int depth);
+
+// intermediate IA -> N64 raw I4/I8
+int i2raw(uint8_t *raw, const ia *img, int width, int height, int depth);
+
+
+//---------------------------------------------------------
+// N64 CI <-> N64 RGBA16/IA16
+//---------------------------------------------------------
+
+// N64 CI raw data and palette to raw data (either RGBA16 or IA16)
+uint8_t *ci2raw(const uint8_t *rawci, const uint8_t *palette, int width, int height, int ci_depth);
+
+// convert from raw (RGBA16 or IA16) format to CI + palette
+int raw2ci(uint8_t *rawci, palette_t *pal, const uint8_t *raw, int raw_len, int ci_depth);
+
+
+//---------------------------------------------------------
+// intermediate RGBA/IA -> PNG
+//---------------------------------------------------------
+
+// intermediate RGBA write to PNG file
+int rgba2png(unsigned char** png_output, int* size_output, const rgba* img, int width, int height);
+
+// intermediate IA write to grayscale PNG file
+int ia2png(unsigned char** png_output, int* size_output, const ia* img, int width, int height);
+
+
+//---------------------------------------------------------
+// PNG -> intermediate RGBA/IA
+//---------------------------------------------------------
+
+// PNG file -> intermediate RGBA
+rgba *png2rgba(unsigned char* png_input, int size_input, int *width, int *height);
+
+// PNG file -> intermediate IA
+ia *png2ia(unsigned char* png_input, int size_input, int *width, int *height);
+
+
+//---------------------------------------------------------
+// version
+//---------------------------------------------------------
+
+// get version of underlying graphics reading library
+const char *n64graphics_get_read_version(void);
+
+// get version of underlying graphics writing library
+const char *n64graphics_get_write_version(void);
+
+#endif // N64GRAPHICS_H_