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Procedure: simple output mask support for RPN expressions

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unknown
2012-07-02 02:12:18 +06:00
parent 5f10170dbf
commit a53dba6d39
1 changed files with 25 additions and 11 deletions
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36
src/alternativa/engine3d/materials/compiler/Procedure.as
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@@ -183,18 +183,18 @@ package alternativa.engine3d.materials.compiler {
// 2) Check for errors and complex expressions
// 3) Compile through AGAL
// 4) Only +-/* operators and one assignment =
// 5) output mask not supported
// 5) output mask supported for : (.x, .y, .z, .w, .xy, .xyz, .xyzw)
// 6) swizzle supported
// 7) swizzle handled like in AGAL compiler
// TODO: implement output mask
// TODO: handle swizzle smartly (.zw -> .zwzw)
// TODO: implement complex operators (dp3, nrm, sat)
// TODO: minimize output temporaries count (sort operators by priority)
// TODO: write to ByteArray directly
// TODO: implement complex operators (dp3, nrm, sat)
// TODO: implement negate unary operator (-x)
// TODO: implement tex (tex2D, texCube) in any form
// TODO: implement groups and complex expressions
// TODO: support additional output masks
// TODO: optimize variables components usage (sort by swizzles length)
// TODO: optimize
// TODO: implement alternate assignments
@@ -209,8 +209,22 @@ package alternativa.engine3d.materials.compiler {
if (operands[1] != "=") {
throw new Error("Syntax error");
}
var i:int;
var output:String = operands[0];
if (output.indexOf(".") >= 0) throw new Error("Output mask is not supported");
var maskIndex:int = output.lastIndexOf(".");
var outputMaskLen:int = (maskIndex >= 0) ? output.length - maskIndex - 1 : 4;
if (outputMaskLen != 1 && maskIndex >= 0) {
// check mask
const X_CHAR_CODE:int = "x".charCodeAt(0);
for (i = 0; i < outputMaskLen; i++) {
var code:int = (i == 3) ? X_CHAR_CODE -1 : X_CHAR_CODE + i; // .w
if (output.charCodeAt(maskIndex + i + 1) != code) {
throw new Error("Output mask with such type not supported " + output + ".");
}
}
}
var outputVar:String = (maskIndex >= 0) ? output.substr(0, maskIndex) : output;
if (outputMaskLen == 4) output = outputVar;
var operators:Vector.<String> = new Vector.<String>();
var variables:Vector.<String> = new Vector.<String>();
@@ -245,17 +259,18 @@ package alternativa.engine3d.materials.compiler {
throw new Error("Variables size mistmatch " + a + " and " + b + ".");
}
var maxSwizzle:uint = (aSwizzleLen > bSwizzleLen) ? aSwizzleLen : bSwizzleLen;
if (isLastOperator && maxSwizzle != 4 && maxSwizzle != 1) {
if (maxSwizzle > outputMaskLen || (isLastOperator && maxSwizzle != outputMaskLen && maxSwizzle != 1)) {
throw new Error("Expression differs in size with output " + output + ".");
}
var out:String = output;
if (!isLastOperator) {
if (!isLastOperator && maxSwizzle != outputMaskLen) {
// TODO: use same components like in variables (.zw + .zw -> .zw)
if (maxSwizzle == 1) {
out = output + ".x";
out = outputVar + ".x";
} else if (maxSwizzle == 2) {
out = output + ".xy";
out = outputVar + ".xy";
} else if (maxSwizzle == 3) {
out = output + ".xyz";
out = outputVar + ".xyz";
}
}
switch (command) {
@@ -283,7 +298,7 @@ package alternativa.engine3d.materials.compiler {
writeAGALExpression("mov " + output + " " + operand);
}
var wasVariable:Boolean = false;
for (var i:int = 2; i < numOperands; i++) {
for (i = 2; i < numOperands; i++) {
operand = operands[i];
switch (operand) {
case "+":
@@ -349,7 +364,6 @@ package alternativa.engine3d.materials.compiler {
//-- too many interpolated values
// You can not use kil in fragment shader
// TODO: try to move regexp in static
var operands:Array = source.match(agalParser);
// It is possible not use the input parameter. It is optimization of the linker