/* Parses through the shader file and processes the tokens delivered by
* DefTokeniser.
*/
void ShaderFileLoader::parseShaderFile(std::istream& inStr,
const std::string& filename)
{
// Parse the file with a blocktokeniser, the actual block contents
// will be parsed separately.
parser::BasicDefBlockTokeniser<std::istream> tokeniser(inStr);
while (tokeniser.hasMoreBlocks())
{
// Get the next block
parser::BlockTokeniser::Block block = tokeniser.nextBlock();
// Skip tables
if (block.name.substr(0, 5) == "table")
{
std::string tableName = block.name.substr(6);
if (tableName.empty())
{
rError() << "[shaders] " << filename << ": Missing table name." << std::endl;
continue;
}
TableDefinitionPtr table(new TableDefinition(tableName, block.contents));
if (!GetShaderSystem()->addTableDefinition(table))
{
rError() << "[shaders] " << filename
<< ": table " << tableName << " already defined." << std::endl;
}
continue;
}
else if (block.name.substr(0, 5) == "skin ")
{
continue; // skip skin definition
}
else if (block.name.substr(0, 9) == "particle ")
{
continue; // skip particle definition
}
boost::algorithm::replace_all(block.name, "\\", "/"); // use forward slashes
ShaderTemplatePtr shaderTemplate(new ShaderTemplate(block.name, block.contents));
// Construct the ShaderDefinition wrapper class
ShaderDefinition def(shaderTemplate, filename);
// Insert into the definitions map, if not already present
if (!GetShaderLibrary().addDefinition(block.name, def))
{
rError() << "[shaders] " << filename
<< ": shader " << block.name << " already defined." << std::endl;
}
}
}
ShaderDiscardCase* makeDiscardCase (Context& context, DiscardTemplate tmpl, DiscardMode mode)
{
StringTemplate shaderTemplate(getTemplate(tmpl));
map<string, string> params;
switch (mode)
{
case DISCARDMODE_ALWAYS: params["DISCARD"] = "discard"; break;
case DISCARDMODE_NEVER: params["DISCARD"] = "if (false) discard"; break;
case DISCARDMODE_UNIFORM: params["DISCARD"] = "if (ui_one > 0) discard"; break;
case DISCARDMODE_DYNAMIC: params["DISCARD"] = "if (v_coords.x+v_coords.y > 0.0) discard"; break;
case DISCARDMODE_TEXTURE: params["DISCARD"] = "if (texture(ut_brick, v_coords.xy*0.25+0.5).x < 0.7) discard"; break;
default:
DE_ASSERT(DE_FALSE);
break;
}
string name = string(getTemplateName(tmpl)) + "_" + getModeName(mode);
string description = string(getModeDesc(mode)) + " in " + getTemplateDesc(tmpl);
return new ShaderDiscardCase(context, name.c_str(), description.c_str(), shaderTemplate.specialize(params).c_str(), getEvalFunc(mode), mode == DISCARDMODE_TEXTURE);
}
