Optimize flat triangle edge rasterization.
Change-Id: Ibfd483ce3cba6ec036327b32cba1460d68f8c9e8
Reviewed-on: https://swiftshader-review.googlesource.com/3542
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/src/Shader/SetupRoutine.cpp b/src/Shader/SetupRoutine.cpp
index c31bbec..ac65afa 100644
--- a/src/Shader/SetupRoutine.cpp
+++ b/src/Shader/SetupRoutine.cpp
@@ -559,15 +559,8 @@
{
If(Ya != Yb)
{
- Int xMin = *Pointer<Int>(data + OFFSET(DrawData,scissorX0));
- Int xMax = *Pointer<Int>(data + OFFSET(DrawData,scissorX1));
-
Bool swap = Yb < Ya;
- Pointer<Byte> leftEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->left);
- Pointer<Byte> rightEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->right);
- Pointer<Byte> edge = IfThenElse(swap, rightEdge, leftEdge);
-
Int X1 = IfThenElse(swap, Xb, Xa);
Int X2 = IfThenElse(swap, Xa, Xb);
Int Y1 = IfThenElse(swap, Yb, Ya);
@@ -578,6 +571,13 @@
If(y1 < y2)
{
+ Int xMin = *Pointer<Int>(data + OFFSET(DrawData,scissorX0));
+ Int xMax = *Pointer<Int>(data + OFFSET(DrawData,scissorX1));
+
+ Pointer<Byte> leftEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->left);
+ Pointer<Byte> rightEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->right);
+ Pointer<Byte> edge = IfThenElse(swap, rightEdge, leftEdge);
+
// Deltas
Int DX12 = X2 - X1;
Int DY12 = Y2 - Y1;
