Remove unnecessary VertexLayout::getVertexStepMode

Author: halx99

axmol/rhi/RHITypes.h

@@ -182,12 +182,6 @@ enum class IndexFormat : uint32_t
     U_INT   = 2,
 };
 
-enum class VertexStepMode : uint32_t
-{
-    VERTEX,
-    INSTANCE
-};
-
 enum class PrimitiveType : uint32_t
 {
     POINT,

axmol/rhi/VertexLayout.h

@@ -164,13 +164,6 @@ class AX_DLL VertexLayout : public Object
 
     uint32_t getHash() const { return _desc.getHash(); }
 
-    /**
-     * Get vertex step function. Default value is VERTEX.
-     * @return Vertex step function.
-     * @note Used in metal.
-     */
-    VertexStepMode getVertexStepMode() const { return _stepMode; }
-
     /**
      *  Get built-in vertex layout id, -1 means not built-in
      */
@@ -179,7 +172,6 @@ class AX_DLL VertexLayout : public Object
 protected:
     VertexLayoutDesc _desc{};
     int _builtinId{-1};
-    VertexStepMode _stepMode = VertexStepMode::VERTEX;
 };
 
 // end of _rhi group

axmol/rhi/metal/RenderPipelineMTL.mm

@@ -37,14 +37,6 @@ of this software and associated documentation files (the "Software"), to deal
 
 namespace
 {
-static MTLVertexStepFunction toMTLVertexStepFunc(VertexStepMode vertexStepMode)
-{
-    if (VertexStepMode::VERTEX == vertexStepMode)
-        return MTLVertexStepFunctionPerVertex;
-    else
-        return MTLVertexStepFunctionPerInstance;
-}
-
 static MTLVertexFormat toMTLVertexFormat(VertexFormat vertexFormat, bool needNormalize)
 {
     MTLVertexFormat ret = MTLVertexFormatFloat4;
@@ -206,7 +198,7 @@ static MTLBlendOperation toMTLBlendOp(BlendOp operation)
          stepFunction:1     stride:15       offest:10       format:5        needNormalized:1
          bit31           bit30 ~ bit16   bit15 ~ bit6    bit5 ~ bit1     bit0
          */
-        hashMe.vertexLayoutInfo[index++] = ((unsigned int)vertexLayout->getVertexStepMode() & 0x1) << 31 |
+        hashMe.vertexLayoutInfo[index++] = ((unsigned int)bindingDesc.instanceStepRate & 0x1) << 31 |
                                            ((unsigned int)(vertexLayout->getStride() & 0x7FFF)) << 16 |
                                            ((unsigned int)bindingDesc.offset & 0x3FF) << 6 |
                                            ((unsigned int)bindingDesc.format & 0x1F) << 1 |