From 7054e477300a012d0e0dd6a0b8dfb7c20699559e Mon Sep 17 00:00:00 2001
From: KikooDX <kikoodx@paranoici.org>
Date: Tue, 1 Mar 2022 15:13:35 +0100
Subject: [PATCH] font char draw

---
 CMakeLists.txt          |   1 +
 inc/lzy.h               | 117 ++++++++++++++++++++++++++++++++++------
 res/font.png            | Bin 0 -> 1327 bytes
 res/fxconv-metadata.txt |   3 ++
 src/main.c              |   6 ++-
 5 files changed, 110 insertions(+), 17 deletions(-)
 create mode 100644 res/font.png

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 413ec93..4bb84db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ set(SOURCES
 
 set(ASSETS
 	res/tset.png
+	res/font.png
 )
 
 fxconv_declare_assets(${ASSETS} WITH_METADATA)
diff --git a/inc/lzy.h b/inc/lzy.h
index 0c24e97..560ad8c 100644
--- a/inc/lzy.h
+++ b/inc/lzy.h
@@ -26,15 +26,12 @@
 extern "C" {
 #endif
 
-#ifndef LZY_SDL_INCLUDE
-#define LZY_SDL_INCLUDE <SDL.h>
-#endif
-
 #include <stdint.h>
 
 #define LZY_UNUSED(x) (void)(x)
 
-int LZY_Init(const char *title, const char *tileset, int target_fps);
+int LZY_Init(const char *title, int target_fps, const char *tset_path,
+             const char *font_path);
 void LZY_Quit(void);
 int LZY_DrawBegin(void);
 int LZY_DrawEnd(void);
@@ -44,6 +41,7 @@ int LZY_DrawClear(void);
 int LZY_DrawRect(int x, int y, unsigned int w, unsigned int h);
 int LZY_DrawFillRect(int x, int y, unsigned int w, unsigned int h);
 int LZY_DrawTile(unsigned int id, int x, int y);
+int LZY_DrawChar(unsigned char chr, int x, int y);
 void LZY_CycleEvents(void);
 int LZY_KeyDown(unsigned int key);
 int LZY_ShouldQuit(void);
@@ -61,6 +59,9 @@ enum LZY_ScanCode {
 	LZYK_X = KEY_OPTN,
 };
 #else /* end FXCG50, begin SDL2 */
+#ifndef LZY_SDL_INCLUDE
+#define LZY_SDL_INCLUDE <SDL.h>
+#endif
 #include LZY_SDL_INCLUDE
 enum LZY_ScanCode {
 	LZYK_LEFT,
@@ -80,8 +81,11 @@ enum LZY_ScanCode {
 /* implementation */
 #ifdef LZY_IMPLEMENTATION
 #undef LZY_IMPLEMENTATION
-#ifndef LZY_TILE_SIZE
-#define LZY_TILE_SIZE 16
+#ifndef LZY_SDL_INCLUDE
+#define LZY_SDL_INCLUDE <SDL.h>
+#endif
+#ifndef LZY_SDL_IMAGE_INCLUDE
+#define LZY_SDL_IMAGE_INCLUDE <SDL_image.h>
 #endif
 #ifndef LZY_DISPLAY_WIDTH
 #define LZY_DISPLAY_WIDTH 396
@@ -89,11 +93,17 @@ enum LZY_ScanCode {
 #ifndef LZY_DISPLAY_HEIGHT
 #define LZY_DISPLAY_HEIGHT 224
 #endif
-#ifndef LZY_SDL_INCLUDE
-#define LZY_SDL_INCLUDE <SDL.h>
+#ifndef LZY_TILE_SIZE
+#define LZY_TILE_SIZE 16
 #endif
-#ifndef LZY_SDL_IMAGE_INCLUDE
-#define LZY_SDL_IMAGE_INCLUDE <SDL_image.h>
+#ifndef LZY_CHR_WIDTH
+#define LZY_CHR_WIDTH LZY_TILE_SIZE
+#endif
+#ifndef LZY_CHR_HEIGHT
+#define LZY_CHR_HEIGHT LZY_TILE_SIZE
+#endif
+#ifndef LZY_FIRST_CHR
+#define LZY_FIRST_CHR ' '
 #endif
 
 #ifdef FXCG50
@@ -110,17 +120,27 @@ static volatile int has_ticked = 0;
 #ifdef LZY_GINT_TILESET
 static unsigned int tset_width, tset_height;
 #endif
+#ifdef LZY_GINT_FONT
+static unsigned int font_width, font_height;
+#endif
 
 static int timer_callback(volatile int *);
 
-int LZY_Init(const char *title, const char *tileset, int target_fps) {
+int LZY_Init(const char *title, int target_fps, const char *tset_path,
+             const char *font_path) {
 #ifdef LZY_GINT_TILESET
 	extern bopti_image_t LZY_GINT_TILESET;
 	tset_width = LZY_GINT_TILESET.width / LZY_TILE_SIZE;
 	tset_height = LZY_GINT_TILESET.height / LZY_TILE_SIZE;
+#endif
+#ifdef LZY_GINT_FONT
+	extern bopti_image_t LZY_GINT_FONT;
+	font_width = LZY_GINT_FONT.width / LZY_TILE_SIZE;
+	font_height = LZY_GINT_FONT.height / LZY_TILE_SIZE;
 #endif
 	LZY_UNUSED(title);
-	LZY_UNUSED(tileset);
+	LZY_UNUSED(tset_path);
+	LZY_UNUSED(font_path);
 
 	if (target_fps > 0) {
 		timer = timer_configure(TIMER_ANY, 1000000 / target_fps,
@@ -203,6 +223,29 @@ int LZY_DrawTile(unsigned int id, int x, int y) {
 #endif
 }
 
+int LZY_DrawChar(unsigned char chr, int x, int y) {
+#ifndef LZY_GINT_FONT
+	LZY_UNUSED(chr);
+	LZY_UNUSED(x);
+	LZY_UNUSED(y);
+	return -1;
+#else
+	extern bopti_image_t LZY_GINT_FONT;
+	const unsigned int id = (unsigned int)chr - LZY_FIRST_CHR;
+	int ix, iy;
+
+	if (id >= font_width * font_height)
+		return -1;
+
+	ix = (id % font_width) * LZY_CHR_WIDTH;
+	iy = (id / font_width) * LZY_CHR_HEIGHT;
+	dsubimage(x, y, &LZY_GINT_FONT, ix, iy, LZY_CHR_WIDTH, LZY_CHR_HEIGHT,
+	          DIMAGE_NONE);
+
+	return 0;
+#endif
+}
+
 void LZY_CycleEvents(void) {
 	clearevents();
 	should_quit = should_quit || keydown(KEY_EXIT);
@@ -234,14 +277,16 @@ static SDL_Window *window = NULL;
 static SDL_Renderer *renderer = NULL;
 static SDL_Texture *target = NULL;
 static SDL_Texture *tset = NULL;
-static int tset_width, tset_height;
+static SDL_Texture *font = NULL;
+static int tset_width, tset_height, font_width, font_height;
 static int should_quit = 0;
 static int input[LZYK_COUNT] = {0};
 static int fps_limiter = 0;
 static uint64_t min_dt;
 static uint64_t next_time;
 
-int LZY_Init(const char *title, const char *tileset, int target_fps) {
+int LZY_Init(const char *title, int target_fps, const char *tset_path,
+             const char *font_path) {
 	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
 		error = SDL_GetError();
 		return -1;
@@ -273,7 +318,7 @@ int LZY_Init(const char *title, const char *tileset, int target_fps) {
 		return -4;
 	}
 
-	tset = IMG_LoadTexture(renderer, tileset);
+	tset = IMG_LoadTexture(renderer, tset_path);
 	if (tset == NULL) {
 		error = IMG_GetError();
 		return -5;
@@ -286,6 +331,19 @@ int LZY_Init(const char *title, const char *tileset, int target_fps) {
 	tset_width /= LZY_TILE_SIZE;
 	tset_height /= LZY_TILE_SIZE;
 
+	font = IMG_LoadTexture(renderer, font_path);
+	if (font == NULL) {
+		error = IMG_GetError();
+		return -7;
+	}
+
+	if (SDL_QueryTexture(font, NULL, NULL, &font_width, &font_height) < 0) {
+		error = SDL_GetError();
+		return -8;
+	}
+	font_width /= LZY_CHR_WIDTH;
+	font_height /= LZY_CHR_HEIGHT;
+
 	fps_limiter = target_fps > 0;
 	if (fps_limiter) {
 		min_dt = 1000 / target_fps;
@@ -450,6 +508,33 @@ int LZY_DrawTile(unsigned int id, int x, int y) {
 	return 0;
 }
 
+int LZY_DrawChar(unsigned char chr, int x, int y) {
+	const unsigned int id = (unsigned int)chr - LZY_FIRST_CHR;
+	SDL_Rect src, dst;
+
+	if (id >= (unsigned int)(font_width * font_height)) {
+		error = "chr exceeds boundaries";
+		return -1;
+	}
+
+	src.x = (id % font_width) * LZY_CHR_WIDTH;
+	src.y = (id / font_width) * LZY_CHR_HEIGHT;
+	src.w = LZY_CHR_WIDTH;
+	src.h = LZY_CHR_HEIGHT;
+
+	dst.x = x;
+	dst.y = y;
+	dst.w = LZY_CHR_WIDTH;
+	dst.h = LZY_CHR_HEIGHT;
+
+	if (SDL_RenderCopy(renderer, font, &src, &dst) < 0) {
+		error = SDL_GetError();
+		return -2;
+	}
+
+	return 0;
+}
+
 void LZY_CycleEvents(void) {
 	static const SDL_Scancode sc[LZYK_COUNT] = {
 	    SDL_SCANCODE_LEFT, SDL_SCANCODE_RIGHT, SDL_SCANCODE_UP,
diff --git a/res/font.png b/res/font.png
new file mode 100644
index 0000000000000000000000000000000000000000..4acde232de8f011a846ee913d658a63cadb04439
GIT binary patch
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diff --git a/res/fxconv-metadata.txt b/res/fxconv-metadata.txt
index 8ca05ea..cbf605c 100644
--- a/res/fxconv-metadata.txt
+++ b/res/fxconv-metadata.txt
@@ -1,3 +1,6 @@
 tset.png:
   type: bopti-image
   name: bimg_tset
+font.png:
+  type: bopti-image
+  name: bimg_font
diff --git a/src/main.c b/src/main.c
index a051038..9ed25a7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,9 @@
 #define LZY_IMPLEMENTATION
 #define LZY_GINT_TILESET bimg_tset
+#define LZY_GINT_FONT    bimg_font
+#define LZY_CHR_WIDTH    16
+#define LZY_CHR_HEIGHT   16
+#define LZY_FIRST_CHR    ' '
 #include "lzy.h"
 
 static void draw_player(int x, int y);
@@ -8,7 +12,7 @@ int main(void) {
 	int x = 0;
 	int y = 0;
 
-	if (LZY_Init("lzy example", "res/tset.png", 30)) {
+	if (LZY_Init("lzy example", 30, "res/tset.png", "res/font.png")) {
 		LZY_Log(LZY_GetError());
 		LZY_Quit();
 		return 1;