ren_texture

2 files changed, 31 insertions, 0 deletions

diff --git a/render.c b/render.c
index 023c33a..c64cef3 100644
--- a/render.c
+++ b/render.c
@@ -478,6 +478,32 @@ step:
 	}
 }
 
+void ren_texture(
+	Renderer* r,
+	const Rect* re,
+	const Texture* t
+) {
+	Rect rect = *re;
+	Colour* d;
+	int s, y, ey, ex;
+	rect_clipr(&rect, r->clip);
+	d = &r->t[rect.x + rect.y * r->vp[0]];
+	s = r->vp[0] - rect.w;
+	ex = rect.x + rect.w;
+	ey = rect.y + rect.h;
+	for (y = rect.y; y < ey; y++) {
+		int v = (y << fbits) / re->h;
+		int x;
+		for (x = rect.x; x < ex; x++) {
+			int u = (x << fbits) / re->w;
+			Colour c = sample_tex(t, u, v);
+			*d = blend(*d, c);
+			d++;
+		}
+		d += s;
+	}
+}
+
 void ren_tri(
 	Renderer* r,
 	const int* iv0,
diff --git a/render.h b/render.h
index e655c52..e7d459f 100644
--- a/render.h
+++ b/render.h
@@ -107,6 +107,11 @@ void ren_line(
 	const int* s,
 	const int* e
 );
+void ren_texture(
+	Renderer* r,
+	const Rect* re,
+	const Texture* t
+);
 /* Vertex format:
  * x y z u v r g b
  * All fixed point values with 9 bits of precision.