_getShaderCode(ParsedShader shader)
{
var header = new StringBuilder();
foreach (var uniform in shader.Uniforms.Values)
{
if (uniform.DefaultValue != null)
{
header.AppendFormat("uniform {0} {1} = {2};", uniform.Type.GetNativeType(), uniform.Name,
uniform.DefaultValue);
}
else
{
header.AppendFormat("uniform {0} {1};", uniform.Type.GetNativeType(), uniform.Name);
}
}
// TODO: Varyings.
ShaderFunctionDefinition fragmentMain = null;
ShaderFunctionDefinition vertexMain = null;
foreach (var function in shader.Functions)
{
if (function.Name == "fragment")
{
fragmentMain = function;
continue;
}
if (function.Name == "vertex")
{
vertexMain = function;
continue;
}
header.AppendFormat("{0} {1}(", function.ReturnType.GetNativeType(), function.Name);
var first = true;
foreach (var parameter in function.Parameters)
{
if (!first)
{
header.Append(", ");
}
first = false;
header.AppendFormat("{0} {1} {2}", parameter.Qualifiers.GetString(), parameter.Type.GetNativeType(),
parameter.Name);
}
header.AppendFormat(") {{\n{0}\n}}\n", function.Body);
}
return(header.ToString(), vertexMain?.Body ?? "", fragmentMain?.Body ?? "");
}
private (string vertBody, string fragBody) GetShaderCode(ParsedShader shader)
{
var headerUniforms = new StringBuilder();
foreach (var constant in shader.Constants.Values)
{
headerUniforms.AppendFormat("const {0} {1} = {2};\n", constant.Type.GetNativeType(), constant.Name,
constant.Value);
}
foreach (var uniform in shader.Uniforms.Values)
{
if (uniform.DefaultValue != null)
{
headerUniforms.AppendFormat("uniform {0} {1} = {2};\n", uniform.Type.GetNativeType(), uniform.Name,
uniform.DefaultValue);
}
else
{
headerUniforms.AppendFormat("uniform {0} {1};\n", uniform.Type.GetNativeType(), uniform.Name);
}
}
var varyingsFragment = new StringBuilder();
var varyingsVertex = new StringBuilder();
foreach (var(name, varying) in shader.Varyings)
{
varyingsFragment.AppendFormat("in {0} {1};\n", varying.Type.GetNativeType(), name);
varyingsVertex.AppendFormat("out {0} {1};\n", varying.Type.GetNativeType(), name);
}
ShaderFunctionDefinition fragmentMain = null;
ShaderFunctionDefinition vertexMain = null;
var functionsBuilder = new StringBuilder();
foreach (var function in shader.Functions)
{
if (function.Name == "fragment")
{
fragmentMain = function;
continue;
}
if (function.Name == "vertex")
{
vertexMain = function;
continue;
}
functionsBuilder.AppendFormat("{0} {1}(", function.ReturnType.GetNativeType(), function.Name);
var first = true;
foreach (var parameter in function.Parameters)
{
if (!first)
{
functionsBuilder.Append(", ");
}
first = false;
functionsBuilder.AppendFormat("{0} {1} {2}", parameter.Qualifiers.GetString(), parameter.Type.GetNativeType(),
parameter.Name);
}
functionsBuilder.AppendFormat(") {{\n{0}\n}}\n", function.Body);
}
var(wrapVert, wrapFrag) = shader.Preset switch
{
ShaderPreset.Default => (_shaderWrapCodeDefaultVert, _shaderWrapCodeDefaultFrag),
ShaderPreset.Raw => (_shaderWrapCodeRawVert, _shaderWrapCodeRawFrag),
_ => throw new NotSupportedException()
};
var vertexHeader = $"{headerUniforms}\n{varyingsVertex}\n{functionsBuilder}";
var fragmentHeader = $"{headerUniforms}\n{varyingsFragment}\n{functionsBuilder}";
// These are prefixed with comments because the syntax highlighter I'm using doesn't like the brackets.
// And it's producing a lot of squigly lines.
var vertexSource = wrapVert.Replace("// [SHADER_HEADER_CODE]", vertexHeader);
var fragmentSource = wrapFrag.Replace("// [SHADER_HEADER_CODE]", fragmentHeader);
if (vertexMain != null)
{
vertexSource = vertexSource.Replace("// [SHADER_CODE]", vertexMain.Body);
}
if (fragmentMain != null)
{
fragmentSource = fragmentSource.Replace("// [SHADER_CODE]", fragmentMain.Body);
}
return(vertexSource, fragmentSource);
}
