diff options
| -rw-r--r-- | teensy/teensy.h | 5 | ||||
| -rw-r--r-- | teensy/teensy_renderer.c | 44 | ||||
| -rw-r--r-- | teensy/teensy_renderer.h | 1 |
3 files changed, 36 insertions, 14 deletions
diff --git a/teensy/teensy.h b/teensy/teensy.h index 1a738d7..300939c 100644 --- a/teensy/teensy.h +++ b/teensy/teensy.h @@ -23,6 +23,8 @@ #define ty_max(a, b) ((a) > (b) ? (a) : (b)) #define ty_min(a, b) ((a) < (b) ? (a) : (b)) +#define TY_CLIP_NONE ((ty_Recti){0}) + #define TY_COLOR_BLACK ty_color(0, 0, 0 ) #define TY_COLOR_RED ty_color(255, 0, 0 ) #define TY_COLOR_GREEN ty_color(0, 255, 0 ) @@ -178,6 +180,9 @@ int ty_font_height(const ty_Font *font); // Sets the image that the renderer draws to. Pass NULL to restore the screen. void ty_draw_set_target(const ty_Image *img); +// Prevents anything from being drawn outside of the passed rect. Pass +// TY_CLIP_NONE to reset the clipspace. +void ty_draw_set_clip(ty_Recti clip); // Sets the entire render target to one color. void ty_draw_clear(ty_Color col); // Draws an image at the specified position. The color #FF00FF will be ignored diff --git a/teensy/teensy_renderer.c b/teensy/teensy_renderer.c index 0dd4fc3..eee67a3 100644 --- a/teensy/teensy_renderer.c +++ b/teensy/teensy_renderer.c @@ -42,6 +42,14 @@ void image_bounds_check(ty_Image img, ty_Vec2i pos) #endif } +static +ty_Vec2i clamp_point(ty_Vec2i p, ty_Recti rect) +{ + p.x = fmin(fmax(p.x, rect.x), rect.x + rect.w); + p.y = fmin(fmax(p.y, rect.y), rect.y + rect.h); + return p; +} + void ty_init_renderer(void) { r.screen = ty_create_image( @@ -50,6 +58,8 @@ void ty_init_renderer(void) NULL ); r.target = r.screen; + + ty_draw_set_clip(TY_CLIP_NONE); } void ty_deinit_renderer(void) @@ -136,6 +146,20 @@ void ty_draw_set_target(const ty_Image *img) memcpy(&r.target, img, sizeof(r.target)); } +void ty_draw_set_clip(ty_Recti clip) +{ + if (clip.w <= 0 || clip.h <= 0) + clip = screenspace(); + + ty_Vec2i start = clamp_point(ty_recti_start(clip), screenspace()); + ty_Vec2i end = clamp_point(ty_recti_end(clip), screenspace()); + + r.clip = ty_recti( + start.x, start.y, + end.x - start.x, end.y - start.y + ); +} + void ty_draw_clear(ty_Color col) { assert(is_renderer_init()); @@ -144,20 +168,12 @@ void ty_draw_clear(ty_Color col) } } -static -ty_Vec2i clamp_point(ty_Vec2i p, ty_Recti rect) -{ - p.x = fmin(fmax(p.x, rect.x), rect.w); - p.y = fmin(fmax(p.y, rect.y), rect.h); - return p; -} - void ty_draw_image(ty_Image img, ty_Vec2i pos) { - ty_Vec2i p1 = clamp_point(ty_vec2i(pos.x, pos.y), screenspace()); + ty_Vec2i p1 = clamp_point(ty_vec2i(pos.x, pos.y), r.clip); ty_Vec2i p2 = clamp_point( ty_vec2i(pos.x + img.width, pos.y + img.height), - screenspace() + r.clip ); for (int dy = p1.y; dy < p2.y; dy++) { @@ -182,8 +198,8 @@ void ty_draw_image_ex( ty_Recti src, ty_Recti dst ) { - ty_Vec2i p1 = clamp_point(ty_recti_start(dst), screenspace()); - ty_Vec2i p2 = clamp_point(ty_recti_end(dst), screenspace()); + ty_Vec2i p1 = clamp_point(ty_recti_start(dst), r.clip); + ty_Vec2i p2 = clamp_point(ty_recti_end(dst), r.clip); for (int dy = p1.y; dy < p2.y; dy++) { for (int dx = p1.x; dx < p2.x; dx++) { @@ -237,8 +253,8 @@ void ty_draw_image_rot( void ty_draw_rect(ty_Recti rect, ty_Color color) { - ty_Vec2i p1 = clamp_point(ty_vec2i(rect.x, rect.y), screenspace()); - ty_Vec2i p2 = clamp_point(ty_recti_end(rect), screenspace()); + ty_Vec2i p1 = clamp_point(ty_vec2i(rect.x, rect.y), r.clip); + ty_Vec2i p2 = clamp_point(ty_recti_end(rect), r.clip); for (int dy = p1.y; dy < p2.y; dy++) { for (int dx = p1.x; dx < p2.x; dx++) { diff --git a/teensy/teensy_renderer.h b/teensy/teensy_renderer.h index ebd5d6e..28843ac 100644 --- a/teensy/teensy_renderer.h +++ b/teensy/teensy_renderer.h @@ -7,6 +7,7 @@ typedef struct { ty_Image screen; ty_Image target; + ty_Recti clip; } ty_Renderer; extern ty_Renderer r; |