mouse support (for development)

3 files changed, 69 insertions, 5 deletions

diff --git a/demo.c b/demo.c
index 48e53d8..8e5c70a 100644
--- a/demo.c
+++ b/demo.c
@@ -40,6 +40,8 @@ int main(void)
 			stg.flip_v = false;
 			y++;
 		}
+		if (LZR_ButtonDown(LZR_BUTTON_MOUSE_L))
+			LZR_MousePosition(&x, &y);
 		stg.angle = darkness * 20;
 		LZR_CycleEvents();
 		LZR_DrawBegin();
diff --git a/lzr.c b/lzr.c
index b5b9930..865a502 100644
--- a/lzr.c
+++ b/lzr.c
@@ -4,7 +4,6 @@
 #include <SDL2/SDL2_gfxPrimitives.h>
 #include <SDL2/SDL_image.h>
 #include <SDL2/SDL_mixer.h>
-#include <SDL2/SDL_render.h>
 #include <dx/log.h>
 #include <dx/mem.h>
 #include <dx/str.h>
@@ -39,6 +38,11 @@ static uint64_t tick = 0;
 static Mix_Chunk *sounds[LZR_MAX_SOUNDS] = {0};
 static Mix_Music *music = NULL;
 static SDL_BlendMode blend_mode = SDL_BLENDMODE_NONE;
+static int off_x = 0;
+static int off_y = 0;
+static float scale = 1.0;
+static int mouse_x = 0;
+static int mouse_y = 0;
 
 static int _scode_to_button(unsigned int scode)
 {
@@ -355,6 +359,17 @@ bool LZR_PollEvent(LZR_Event *e)
 			input[b] = true;
 			return true;
 		}
+		case SDL_MOUSEBUTTONDOWN: {
+			e->type = LZR_EVENT_BUTTON_DOWN;
+			e->button = LZR_BUTTON_MOUSE_L + se.button.button - 1;
+			e->x = se.button.x, e->y = se.button.y;
+			LZR_ScreenTransform(&e->x, &e->y);
+			mouse_x = e->x, mouse_y = e->y;
+			if (e->button >= LZR_BUTTON_COUNT)
+				continue;
+			input[e->button] = true;
+			return true;
+		}
 		case SDL_KEYUP: {
 			const int b = _scode_to_button(se.key.keysym.scancode);
 			if (b < 0)
@@ -364,6 +379,24 @@ bool LZR_PollEvent(LZR_Event *e)
 			input[b] = false;
 			return true;
 		}
+		case SDL_MOUSEBUTTONUP: {
+			e->type = LZR_EVENT_BUTTON_DOWN;
+			e->button = LZR_BUTTON_MOUSE_L + se.button.button - 1;
+			e->x = se.button.x, e->y = se.button.y;
+			LZR_ScreenTransform(&e->x, &e->y);
+			mouse_x = e->x, mouse_y = e->y;
+			if (e->button >= LZR_BUTTON_COUNT)
+				continue;
+			input[e->button] = false;
+			return true;
+		}
+		case SDL_MOUSEMOTION: {
+			e->type = LZR_EVENT_MOUSE_MOVE;
+			e->x = se.motion.x, e->y = se.motion.y;
+			LZR_ScreenTransform(&e->x, &e->y);
+			mouse_x = e->x, mouse_y = e->y;
+			return true;
+		}
 		default:
 			break;
 		}
@@ -436,9 +469,9 @@ int LZR_DrawEnd(void)
 	SDL_GetWindowSize(window, &win_w, &win_h);
 	const int ratio_w = win_w / config.display_width;
 	const int ratio_h = win_h / config.display_height;
-	const int scale = (ratio_w <= ratio_h) ? ratio_w : ratio_h;
-	const int off_x = (win_w - config.display_width * scale) / 2;
-	const int off_y = (win_h - config.display_height * scale) / 2;
+	scale = (ratio_w <= ratio_h) ? ratio_w : ratio_h;
+	off_x = (win_w - config.display_width * scale) / 2;
+	off_y = (win_h - config.display_height * scale) / 2;
 	const SDL_Rect dest = {off_x, off_y, config.display_width * scale,
 	                       config.display_height * scale};
 	if (SDL_RenderCopyEx(renderer, target, NULL, &dest, 0.0, NULL, 0) < 0) {
@@ -727,6 +760,28 @@ uint64_t LZR_GetTick(void)
 	return tick;
 }
 
+void LZR_ScreenTransform(int *x, int *y)
+{
+	if (scale == 0.0)
+		return;
+	if (x != NULL) {
+		*x -= off_x;
+		*x /= scale;
+	}
+	if (y != NULL) {
+		*y -= off_y;
+		*y /= scale;
+	}
+}
+
+void LZR_MousePosition(int *x, int *y)
+{
+	if (x != NULL)
+		*x = mouse_x;
+	if (y != NULL)
+		*y = mouse_y;
+}
+
 /*
 ** Copyright (c) 2022 kdx
 **
diff --git a/lzr.h b/lzr.h
index e244a51..82753c7 100644
--- a/lzr.h
+++ b/lzr.h
@@ -22,6 +22,7 @@ typedef enum LZR_EventType {
 	LZR_EVENT_QUIT,
 	LZR_EVENT_BUTTON_DOWN,
 	LZR_EVENT_BUTTON_UP,
+	LZR_EVENT_MOUSE_MOVE,
 } LZR_EventType;
 
 typedef enum LZR_Button {
@@ -31,12 +32,16 @@ typedef enum LZR_Button {
 	LZR_BUTTON_DOWN,
 	LZR_BUTTON_O,
 	LZR_BUTTON_X,
+	LZR_BUTTON_MOUSE_L,
+	LZR_BUTTON_MOUSE_M,
+	LZR_BUTTON_MOUSE_R,
 	LZR_BUTTON_COUNT
 } LZR_Button;
 
 typedef struct LZR_Event {
 	LZR_EventType type;
 	LZR_Button button;
+	int x, y;
 } LZR_Event;
 
 typedef struct LZR_ImageDrawSettings {
@@ -72,8 +77,10 @@ int LZR_PlaySound(int id);
 int LZR_SetMusicVolume(float volume);
 int LZR_PlayMusic(const char *path, int loops);
 void LZR_StopMusic(void);
-uint64_t LZR_GetTick(void);
 void LZR_ToggleFullscreen(void);
+uint64_t LZR_GetTick(void);
+void LZR_ScreenTransform(int *x, int *y);
+void LZR_MousePosition(int *x, int *y);
 
 #endif