rice: optimize IsTriangleVisible

diff --git a/source/gles2rice/src/RenderBase.cpp b/source/gles2rice/src/RenderBase.cpp
index 1ba7ec8..9e95147 100644 (file)
--- a/source/gles2rice/src/RenderBase.cpp
+++ b/source/gles2rice/src/RenderBase.cpp
@@ -1553,6 +1553,8 @@ extern "C" void pv_neon(XVECTOR4 *g_vtxTransformed, XVECTOR4 *g_vecProjected,
     uint32 gRSPnumLights, float gRSPfFogMin,
     uint32 primitiveColor, uint32 primitiveColor_);
 
+extern "C" int tv_direction(const XVECTOR4 *v0, const XVECTOR4 *v1, const XVECTOR4 *v2);
+
 void ProcessVertexDataNEON(uint32 dwAddr, uint32 dwV0, uint32 dwNum)
 {
     if (gRSP.bTextureGen && gRSP.bLightingEnable) {
@@ -1761,6 +1763,7 @@ bool IsTriangleVisible(uint32 dwV0, uint32 dwV1, uint32 dwV2)
         // method doesnt' work well when the z value is outside of screenspace
         //if (v0.z < 1 && v1.z < 1 && v2.z < 1)
         {
+#ifndef __ARM_NEON__
             float V1 = v2.x - v0.x;
             float V2 = v2.y - v0.y;
             
@@ -1770,6 +1773,10 @@ bool IsTriangleVisible(uint32 dwV0, uint32 dwV1, uint32 dwV2)
             float fDirection = (V1 * W2) - (V2 * W1);
             fDirection = fDirection * v1.w * v2.w * v0.w;
             //float fDirection = v0.x*v1.y-v1.x*v0.y+v1.x*v2.y-v2.x*v1.y+v2.x*v0.y-v0.x*v2.y;
+#else
+            // really returns float, but we only need sign
+            int fDirection = tv_direction(&v0, &v1, &v2);
+#endif
 
             if (fDirection < 0 && gRSP.bCullBack)
             {

diff --git a/source/gles2rice/src/RenderBase_neon.S b/source/gles2rice/src/RenderBase_neon.S
index 3e60c58..4310947 100644 (file)
--- a/source/gles2rice/src/RenderBase_neon.S
+++ b/source/gles2rice/src/RenderBase_neon.S
@@ -310,4 +310,23 @@ FUNCTION(multiply_subtract2):
     .size       multiply_subtract2, .-multiply_subtract2
 
 
+@ (const XVECTOR4 *v0, const XVECTOR4 *v1, const XVECTOR4 *v2)
+FUNCTION(tv_direction):
+    vld1.32     {q0}, [r0]
+    vld1.32     {q2}, [r2]
+    vld1.32     {q1}, [r1]
+    vsub.f32    d6, d4, d0     @ d6 = V2,V1
+    vsub.f32    d7, d4, d2     @ d7 = W2,W1
+    vmul.f32    d1, d5         @ d1 = v0.w * v2.w
+    vrev64.32   d7, d7
+    vmul.f32    d6, d7         @ d6 = V2*W1,V1*W2
+    vmul.f32    d1, d3         @ d1 *= v1.w
+    vshr.u64    d7, d6, #32
+    vsub.f32    d6, d7         @ d6[0] = V1*W2 - V2*W1
+    vshr.u64    d1, d1, #32
+    vmul.f32    d0, d1, d6
+    vmov.32     r0, d0[0]
+    bx          lr
+
+
 @ vim:filetype=armasm:expandtab