draw points

2 files changed, 31 insertions, 0 deletions

diff --git a/lzr.c b/lzr.c
index 5432a99..2789751 100644
--- a/lzr.c
+++ b/lzr.c
@@ -30,6 +30,7 @@ static unsigned int map[LZR_BUTTON_COUNT] = {
     SDL_SCANCODE_LEFT, SDL_SCANCODE_RIGHT, SDL_SCANCODE_UP,
     SDL_SCANCODE_DOWN, SDL_SCANCODE_X,     SDL_SCANCODE_C};
 static bool input[LZR_BUTTON_COUNT] = {false};
+static SDL_Point *points = NULL;
 
 static char *_path_prefix(const char *path)
 {
@@ -179,6 +180,12 @@ int LZR_Init(LZR_Config cfg)
 		dx_log_error("%s", SDL_GetError());
 		return -1;
 	}
+	points = dx_alloc(sizeof(SDL_Point) * cfg.display_width *
+	                  cfg.display_height);
+	if (points == NULL) {
+		dx_log_error("dx_alloc failed");
+		return -1;
+	}
 	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, 0);
 	if (config.target_fps) {
 		min_dt = 1000 / config.target_fps;
@@ -195,6 +202,10 @@ void LZR_Quit(void)
 			images[i].tex = NULL;
 			dx_log_trace("destroyed image %d", i);
 		}
+	if (points != NULL) {
+		dx_free(points);
+		points = NULL;
+	}
 	if (target != NULL) {
 		SDL_DestroyTexture(target);
 		target = NULL;
@@ -398,6 +409,25 @@ int LZR_DrawPoint(int x, int y)
 	return 0;
 }
 
+int LZR_DrawPoints(int *x, int *y, int n)
+{
+
+	if (n > (int)(config.display_width * config.display_height)) {
+		dx_log_error("%d > %u", n,
+		             config.display_width * config.display_height);
+		return -1;
+	}
+	for (int i = 0; i < n; i++) {
+		points[i].x = x[i];
+		points[i].y = y[i];
+	}
+	if (SDL_RenderDrawPoints(renderer, points, n) < 0) {
+		dx_log_error("%s", SDL_GetError());
+		return -1;
+	}
+	return 0;
+}
+
 int LZR_DrawLine(int x0, int y0, int x1, int y1)
 {
 	if (SDL_RenderDrawLine(renderer, x0, y0, x1, y1) < 0) {
diff --git a/lzr.h b/lzr.h
index a5ba1d4..f474f0b 100644
--- a/lzr.h
+++ b/lzr.h
@@ -54,6 +54,7 @@ int LZR_DrawEnd(void);
 int LZR_DrawSetColor(float r, float g, float b);
 int LZR_DrawClear(void);
 int LZR_DrawPoint(int x, int y);
+int LZR_DrawPoints(int *x, int *y, int n);
 int LZR_DrawLine(int x0, int y0, int x1, int y1);
 int LZR_DrawRect(bool fill, int x, int y, int w, int h);
 int LZR_DrawCircle(bool fill, int x, int y, int radius);