CompilerMSL support matrices & arrays in stage-in & stage-out.

Support flattening StorageOutput & StorageInput matrices and arrays.
No longer move matrix & array inputs to separate buffer.
Add separate SPIRFunction::fixup_statements_in & SPIRFunction::fixup_statements_out
instead of just  SPIRFunction::fixup_statements.
Emit SPIRFunction::fixup_statements at beginning of functions.
CompilerMSL track vars_needing_early_declaration.
Pass global output variables as variables to functions that access them.
Sort input structs by location, same as output structs.
Emit struct declarations in order output, input, uniforms.
Regenerate reference shaders to new formats defined by above.

Author: billhollings

reference/opt/shaders-msl/asm/frag/combined-sampler-reuse.asm.frag

@@ -3,14 +3,14 @@
 
 using namespace metal;
 
-struct main0_in
+struct main0_out
 {
-    float2 vUV [[user(locn0)]];
+    float4 FragColor [[color(0)]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 FragColor [[color(0)]];
+    float2 vUV [[user(locn0)]];
 };
 
 fragment main0_out main0(main0_in in [[stage_in]], texture2d<float> uTex [[texture(1)]], sampler uSampler [[sampler(0)]])

reference/opt/shaders-msl/asm/frag/frem.asm.frag

@@ -3,15 +3,15 @@
 
 using namespace metal;
 
-struct main0_in
+struct main0_out
 {
-    float4 vB [[user(locn1)]];
-    float4 vA [[user(locn0)]];
+    float4 FragColor [[color(0)]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 FragColor [[color(0)]];
+    float4 vA [[user(locn0)]];
+    float4 vB [[user(locn1)]];
 };
 
 fragment main0_out main0(main0_in in [[stage_in]])

reference/opt/shaders-msl/asm/frag/implicit-read-dep-phi.asm.frag

@@ -3,14 +3,14 @@
 
 using namespace metal;
 
-struct main0_in
+struct main0_out
 {
-    float4 v0 [[user(locn0)]];
+    float4 FragColor [[color(0)]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 FragColor [[color(0)]];
+    float4 v0 [[user(locn0)]];
 };
 
 fragment main0_out main0(main0_in in [[stage_in]], texture2d<float> uImage [[texture(0)]], sampler uImageSmplr [[sampler(0)]])

reference/opt/shaders-msl/asm/frag/srem.asm.frag

@@ -3,15 +3,15 @@
 
 using namespace metal;
 
-struct main0_in
+struct main0_out
 {
-    int4 vB [[user(locn1)]];
-    int4 vA [[user(locn0)]];
+    float4 FragColor [[color(0)]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 FragColor [[color(0)]];
+    int4 vA [[user(locn0)]];
+    int4 vB [[user(locn1)]];
 };
 
 fragment main0_out main0(main0_in in [[stage_in]])

reference/opt/shaders-msl/asm/frag/unreachable.asm.frag

@@ -3,14 +3,14 @@
 
 using namespace metal;
 
-struct main0_in
+struct main0_out
 {
-    int counter [[user(locn0)]];
+    float4 FragColor [[color(0)]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 FragColor [[color(0)]];
+    int counter [[user(locn0)]];
 };
 
 fragment main0_out main0(main0_in in [[stage_in]])

reference/opt/shaders-msl/desktop-only/vert/basic.desktop.sso.vert

@@ -8,18 +8,18 @@ struct UBO
     float4x4 uMVP;
 };
 
-struct main0_in
-{
-    float3 aNormal [[attribute(1)]];
-    float4 aVertex [[attribute(0)]];
-};
-
 struct main0_out
 {
     float3 vNormal [[user(locn0)]];
     float4 gl_Position [[position]];
 };
 
+struct main0_in
+{
+    float4 aVertex [[attribute(0)]];
+    float3 aNormal [[attribute(1)]];
+};
+
 vertex main0_out main0(main0_in in [[stage_in]], constant UBO& _16 [[buffer(0)]])
 {
     main0_out out = {};

reference/opt/shaders-msl/flatten/basic.flatten.vert

@@ -8,18 +8,18 @@ struct UBO
     float4x4 uMVP;
 };
 
-struct main0_in
-{
-    float3 aNormal [[attribute(1)]];
-    float4 aVertex [[attribute(0)]];
-};
-
 struct main0_out
 {
     float3 vNormal [[user(locn0)]];
     float4 gl_Position [[position]];
 };
 
+struct main0_in
+{
+    float4 aVertex [[attribute(0)]];
+    float3 aNormal [[attribute(1)]];
+};
+
 vertex main0_out main0(main0_in in [[stage_in]], constant UBO& _16 [[buffer(0)]])
 {
     main0_out out = {};

reference/opt/shaders-msl/flatten/multiindex.flatten.vert

@@ -8,14 +8,14 @@ struct UBO
     float4 Data[3][5];
 };
 
-struct main0_in
+struct main0_out
 {
-    int2 aIndex [[attribute(0)]];
+    float4 gl_Position [[position]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 gl_Position [[position]];
+    int2 aIndex [[attribute(0)]];
 };
 
 vertex main0_out main0(main0_in in [[stage_in]], constant UBO& _20 [[buffer(0)]])

reference/opt/shaders-msl/flatten/push-constant.flatten.vert

@@ -10,18 +10,18 @@ struct PushMe
     float Arr[4];
 };
 
-struct main0_in
-{
-    float4 Pos [[attribute(1)]];
-    float2 Rot [[attribute(0)]];
-};
-
 struct main0_out
 {
     float2 vRot [[user(locn0)]];
     float4 gl_Position [[position]];
 };
 
+struct main0_in
+{
+    float2 Rot [[attribute(0)]];
+    float4 Pos [[attribute(1)]];
+};
+
 vertex main0_out main0(main0_in in [[stage_in]], constant PushMe& registers [[buffer(0)]])
 {
     main0_out out = {};

reference/opt/shaders-msl/flatten/rowmajor.flatten.vert

@@ -10,14 +10,14 @@ struct UBO
     float2x4 uMVP;
 };
 
-struct main0_in
+struct main0_out
 {
-    float4 aVertex [[attribute(0)]];
+    float4 gl_Position [[position]];
 };
 
-struct main0_out
+struct main0_in
 {
-    float4 gl_Position [[position]];
+    float4 aVertex [[attribute(0)]];
 };
 
 vertex main0_out main0(main0_in in [[stage_in]], constant UBO& _18 [[buffer(0)]])