1 files changed, 73 insertions, 5 deletions

diff --git a/src/core/device.c b/src/core/device.c
index 3566448..4b16d32 100644
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -88,8 +88,8 @@ void ssr_init(ssr_Config* conf) {
 	state.filtermode = FILTERMODE_POINT;
 	state.wrapmode = WRAPMODE_CLAMP;
 
-	state.blendfactor.src = BLENDFACTOR_SRC_ALPHA;
-	state.blendfactor.dst = BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
+	state.blendfactor.src = BLEND_SRC_ALPHA;
+	state.blendfactor.dst = BLEND_ONE_MINUS_SRC_ALPHA;
 }
 
 float ssr_getaspect() {
@@ -313,14 +313,82 @@ void ssr_blend(Color32* src, Color32* dst, Color32* out) {
 	ssrU_blend(state.blendfactor.src, state.blendfactor.dst, src, dst, out);
 }
 
-void ssrU_blend(ssr_BlendFactor sfactor
+static _blend(ssr_BlendFactor factor, Color32* src, Color32* dst, Color32* out) {
+	switch (factor) {
+		case BLEND_ONE:
+			break;
+		case BLEND_ZERO:
+			out->r = out->g = out->b = out->a = 0;
+			break;
+		case BLEND_SRC_COLOR:
+			out->r *= src->r;
+			out->g *= src->g;
+			out->b *= src->b;
+			out->a *= src->a;
+			break;
+		case BLEND_ONE_MINUS_SRC_COLOR:
+			out->r *= (1 - src->r);
+			out->g *= (1 - src->g);
+			out->b *= (1 - src->b);
+			out->a *= (1 - src->a);
+			break;
+		case BLEND_DST_COLOR:
+			out->r *= dst->r;
+			out->g *= dst->g;
+			out->b *= dst->b;
+			out->a *= dst->a;
+			break;
+		case BLEND_ONE_MINUS_DST_COLOR:
+			out->r *= (1 - dst->r);
+			out->g *= (1 - dst->g);
+			out->b *= (1 - dst->b);
+			out->a *= (1 - dst->a);
+			break;
+		case BLEND_SRC_ALPHA:
+			out->r *= src->a;
+			out->g *= src->a;
+			out->b *= src->a;
+			out->a *= src->a;
+			break;
+		case BLEND_ONE_MINUS_SRC_ALPHA:
+			out->r *= (1 - src->a);
+			out->g *= (1 - src->a);
+			out->b *= (1 - src->a);
+			out->a *= (1 - src->a);
+			break;
+		case BLEND_DST_ALPHA:
+			out->r *= dst->a;
+			out->g *= dst->a;
+			out->b *= dst->a;
+			out->a *= dst->a;
+			break;
+		case BLEND_ONE_MINUS_DST_ALPHA:
+			out->r *= (1 - dst->a);
+			out->g *= (1 - dst->a);
+			out->b *= (1 - dst->a);
+			out->a *= (1 - dst->a);
+			break;
+		default: 
+			ssr_assert(FALSE);
+			break;
+	}
+}
+
+void ssrU_blend(
+	ssr_BlendFactor sfactor
 	, ssr_BlendFactor dfactor
 	, Color32* src
 	, Color32* dst
 	, Color32* out
 ) {
 	ssr_assert(src && dst && out);
-	
+	Color32 s0; s0 = *src;
+	_blend(sfactor, src, dst, src);
+	_blend(dfactor, &s0, dst, dst);
+	out->r = src->r + dst->r;
+	out->g = src->g + dst->g;
+	out->b = src->b + dst->b;
+	out->a = src->a + dst->a;
 }
 
 Color32 ssr_getfbocolor(uint x, uint y) {
@@ -426,7 +494,7 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 			v2 = &state.verts[i2];
 
 			/*back face culling*/
-			if (ssr_isenable(ENABLEMASK_BACKFACECULL)) { 
+			if (ssr_isenable(ENABLE_BACKFACECULL)) { 
 				float w0 = 1 / h0->w, w1 = 1 / h1->w, w2 = 1 / h2->w;
 				Vec3 ab, ac;
 				ab.x = h1->x * w1 - h0->x * w0;