internal/shaderir: rename the built-in func to get a texel to __texelAt

internal/graphics/shader.go

@@ -91,14 +91,14 @@ func imageSrcRegionOnTexture() (vec2, vec2) {
 		shaderSuffix += fmt.Sprintf(`
 func imageSrc%[1]dUnsafeAt(pos vec2) vec4 {
 	// pos is the position in positions of the source texture (= 0th image's texture).
-	return texture2D(__t%[1]d, %[2]s)
+	return __texelAt(__t%[1]d, %[2]s)
 }
 
 func imageSrc%[1]dAt(pos vec2) vec4 {
 	// pos is the position of the source texture (= 0th image's texture).
 	// If pos is in the region, the result is (1, 1). Otherwise, either element is 0.
 	in := step(__textureSourceRegionOrigin, pos) - step(__textureSourceRegionOrigin + __textureSourceRegionSize, pos)
-	return texture2D(__t%[1]d, %[2]s) * in.x * in.y
+	return __texelAt(__t%[1]d, %[2]s) * in.x * in.y
 }
 `, i, pos)
 	}

internal/shader/expr.go

@@ -602,7 +602,7 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 					return nil, nil, nil, false
 				}
 				t = shaderir.Type{Main: shaderir.Mat4}
-			case shaderir.Texture2DF:
+			case shaderir.TexelAt:
 				if len(args) != 2 {
 					cs.addError(e.Pos(), fmt.Sprintf("number of %s's arguments must be 2 but %d", callee.BuiltinFunc, len(args)))
 					return nil, nil, nil, false

internal/shaderir/glsl/type.go

@@ -121,7 +121,7 @@ func (c *compileContext) builtinFuncString(f shaderir.BuiltinFunc) string {
 		return "dFdx"
 	case shaderir.Dfdy:
 		return "dFdy"
-	case shaderir.Texture2DF:
+	case shaderir.TexelAt:
 		if c.unit == shaderir.Pixel {
 			return "texelFetch"
 		}

internal/shaderir/hlsl/hlsl.go

@@ -476,7 +476,7 @@ func (c *compileContext) block(p *shaderir.Program, topBlock, block *shaderir.Bl
 					if len(args) == 1 {
 						return fmt.Sprintf("float4x4FromScalar(%s)", args[0])
 					}
-				case shaderir.Texture2DF:
+				case shaderir.TexelAt:
 					switch c.unit {
 					case shaderir.Pixel:
 						return fmt.Sprintf("%s.Load(int3(%s, 0))", args[0], strings.Join(args[1:], ", "))

internal/shaderir/hlsl/type.go

@@ -143,8 +143,8 @@ func (c *compileContext) builtinFuncString(f shaderir.BuiltinFunc) string {
 		return "ddx"
 	case shaderir.Dfdy:
 		return "ddy"
-	case shaderir.Texture2DF:
+	case shaderir.TexelAt:
-		return "?(texture2D)"
+		return "?(__texelAt)"
 	default:
 		return string(f)
 	}

internal/shaderir/msl/msl.go

@@ -401,7 +401,7 @@ func (c *compileContext) block(p *shaderir.Program, topBlock, block *shaderir.Bl
 			for _, exp := range e.Exprs[1:] {
 				args = append(args, expr(&exp))
 			}
-			if callee.Type == shaderir.BuiltinFuncExpr && callee.BuiltinFunc == shaderir.Texture2DF {
+			if callee.Type == shaderir.BuiltinFuncExpr && callee.BuiltinFunc == shaderir.TexelAt {
 				switch p.Unit {
 				case shaderir.Texel:
 					return fmt.Sprintf("%s.sample(texture_sampler, %s)", args[0], strings.Join(args[1:], ", "))

internal/shaderir/msl/type.go

@@ -149,8 +149,8 @@ func builtinFuncString(f shaderir.BuiltinFunc) string {
 		return "float4x4"
 	case shaderir.Inversesqrt:
 		return "rsqrt"
-	case shaderir.Texture2DF:
+	case shaderir.TexelAt:
-		return "?(texture2D)"
+		return "?(__texelAt)"
 	}
 	return string(f)
 }

internal/shaderir/program.go

@@ -276,11 +276,11 @@ const (
 	Reflect     BuiltinFunc = "reflect"
 	Refract     BuiltinFunc = "refract"
 	Transpose   BuiltinFunc = "transpose"
-	Texture2DF  BuiltinFunc = "texture2D"
 	Dfdx        BuiltinFunc = "dfdx"
 	Dfdy        BuiltinFunc = "dfdy"
 	Fwidth      BuiltinFunc = "fwidth"
 	DiscardF    BuiltinFunc = "discard"
+	TexelAt     BuiltinFunc = "__texelAt"
 )
 
 func ParseBuiltinFunc(str string) (BuiltinFunc, bool) {
@@ -334,11 +334,11 @@ func ParseBuiltinFunc(str string) (BuiltinFunc, bool) {
 		Reflect,
 		Refract,
 		Transpose,
-		Texture2DF,
 		Dfdx,
 		Dfdy,
 		Fwidth,
-		DiscardF:
+		DiscardF,
+		TexelAt:
 		return BuiltinFunc(str), true
 	}
 	return "", false