Load Ultimate Lizard Total Destruction spritesheet

sys/sys_data.h

@@ -15,6 +15,11 @@ typedef uint64_t sys_glyph;
 typedef struct { 
     sys_color pixels[SYS_SPRITE_H][SYS_SPRITE_W];
 } sys_sprite;
+typedef struct {
+    sys_sprite* sprites;
+    uint32_t width;
+    uint32_t height;
+} sys_spritesheet;
 
 sys_screen_color sys_make_screen_color(uint8_t r, uint8_t g, uint8_t b);
 

sys/sys_graphics.c

@@ -11,7 +11,8 @@ void sys_pixel_internal_set(sys_i32 x, sys_i32 y, sys_color c);
 void sys_scanline_internal_set(
     sys_i32 x0, sys_i32 x1, sys_i32 y, sys_color c, bool fill
 );
-void sys_glyph_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c);
+void sys_glyph_internal_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c);
+void sys_sprite_internal_draw(sys_i32 x, sys_i32 y, sys_sprite s);
 
 // == public ==
 void sys_clip_set(sys_i32 x0, sys_i32 y0, sys_i32 x1, sys_i32 y1) {
@@ -63,7 +64,7 @@ void sys_print(char* str, sys_i32 x, sys_i32 y, sys_color col) {
         if (c == 0) { break; }
         if (c == '\n') { x = x_orig; y += 8; continue; }
         if (c == '\r') { x = x_orig; continue; }
-        sys_glyph_draw(x, y, sys_font_small[c], col);
+        sys_glyph_internal_draw(x, y, sys_font_small[c], col);
         x += 8;
     }
 }
@@ -232,6 +233,40 @@ void sys_dpal_reset() {
     }
 }
 
+void sys_sprite_draw(
+    sys_spritesheet spritesheet,
+    sys_i32 n,
+    sys_i32 x, sys_i32 y
+) {
+    sys_sprite_draw_ext(
+        spritesheet,
+        n,
+        x, y,
+        1, 1,
+        false, false
+    );
+}
+
+void sys_sprite_draw_ext(
+    sys_spritesheet spritesheet,
+    sys_i32 n,
+    sys_i32 x, sys_i32 y,
+    sys_i32 w, sys_i32 h,
+    bool flip_x, bool flip_y
+) {
+    // map n to a specific entity on the spritesheet
+    // (this is necessary for w and h)
+    for (int sy = 0; sy < h; sy++) {
+        for (int sx = 0; sx < w; sx++) {
+            sys_i32 tile = n + sx + sy * spritesheet.width;
+            if (tile < 0 || tile >= spritesheet.width * spritesheet.height) {
+                continue;
+            }
+            sys_sprite_internal_draw(x + sx * 8, y + sy * 8, spritesheet.sprites[tile]);
+        }
+    }
+}
+
 // == internal primitives ==
 void sys_pixel_internal_set(sys_i32 x, sys_i32 y, sys_color c) {
     sys_color realc = sys_dpal[c];
@@ -265,7 +300,7 @@ void sys_scanline_internal_set(
     }
 }
 
-void sys_glyph_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c) {
+void sys_glyph_internal_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c) {
     // iterate through the bits of the glyph, and draw the character
     // if that bit is set
     for (int py = 0; py < 8; py++) {
@@ -276,4 +311,12 @@ void sys_glyph_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c) {
             }
         }
     }
+}
+
+void sys_sprite_internal_draw(sys_i32 x, sys_i32 y, sys_sprite s) {
+    for (int py = 0; py < 8; py++) {
+        for (int px = 0; px < 8; px++) {
+            sys_pixel_internal_set(x + px, y + py, s.pixels[py][px]);
+        }
+    }
 }

sys/sys_graphics.h

@@ -83,7 +83,7 @@ void sys_camera_reset();
  * 
  * If r is negative, the circle is not drawn.
  * 
- * This is a special case of sys_circ_oval_draw_ext.
+ * This is a special case of sys_oval_draw_ext.
  */
 void sys_circ_draw(sys_i32 x, sys_i32 y, sys_i32 r, sys_color c);  
 void sys_circ_fill(sys_i32 x, sys_i32 y, sys_i32 r, sys_color c);  
@@ -146,7 +146,24 @@ void sys_dpal_set(sys_color c0, sys_color c1);
  */
 void sys_dpal_reset();
 
-// TODO: SPR
+/**
+ * Draw a given sprite.
+ * 
+ * w, h default to 1.
+ * flip_x and flip_y default to false.
+ */
+void sys_sprite_draw(
+    sys_spritesheet spritesheet,
+    sys_i32 n,
+    sys_i32 x, sys_i32 y
+);
+void sys_sprite_draw_ext(
+    sys_spritesheet spritesheet,
+    sys_i32 n,
+    sys_i32 x, sys_i32 y,
+    sys_i32 w, sys_i32 h,
+    bool flip_x, bool flip_y
+);
 // TODO: SSPR
 // TODO: FILLP?