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#include "../../../include/RenderBackend/OpenGL/Shader.hpp"
#include "../../../include/RenderBackend/OpenGL/opengl.hpp"
#include "../../../include/RenderBackend/OpenGL/CompiledShader.hpp"
#include <cassert>
using namespace std;
namespace amalgine {
ShaderTooManyAttributes::ShaderTooManyAttributes(i32 maxAttributes) :
runtime_error(string("Attempting to define more than ") + to_string(maxAttributes) + " attributes")
{
}
ShaderAttributeAlreadyDefined::ShaderAttributeAlreadyDefined(const std::string &attributeName) :
runtime_error(string("An attribute with the name ") + attributeName + " has already been defined")
{
}
ShaderInvalidAttributeName::ShaderInvalidAttributeName(const std::string &attributeName) :
runtime_error(string("Attribute name ") + attributeName + " is invalid")
{
}
ShaderFunctionAlreadyDefined::ShaderFunctionAlreadyDefined(const std::string &funcName) :
runtime_error(string("Shader function already defined: ") + funcName)
{
}
Shader::Shader() : inputLocationCounter(0), outputLocationCounter(0), mainFuncDefined(false)
{
writeHeader("#version 330 core\n\n");
}
const string& Shader::getOutputAttributeName(i32 attributeIndex)
{
assert(attributeIndex < (i32)outputAttributeNames.size());
return outputAttributeNames[attributeIndex].name;
}
const string& Shader::getInputAttributeName(i32 attributeIndex) const
{
assert(attributeIndex < (i32)inputAttributeNames.size());
return inputAttributeNames[attributeIndex].name;
}
AttributeType Shader::getInputAttributeType(i32 attributeIndex) const
{
assert(attributeIndex < (i32)inputAttributeNames.size());
return getAttributeTypeByName(inputAttributeNames[attributeIndex].typeName);
}
ShaderOutputVec4 Shader::defineOutputVec4(const std::string &name)
{
i32 attributeIndex = defineOutputVariable(name, "vec4");
return ShaderOutputVec4(this, attributeIndex);
}
// TODO: Generate warning if global variable is defined but not assigned to?
ShaderGlobalVec3 Shader::defineGlobalVec3(const std::string &name)
{
if(!isShaderVariableNameValid(name.c_str()))
throw ShaderInvalidAttributeName(name);
if(uniforms.find(name) != uniforms.end())
throw ShaderAttributeAlreadyDefined(name);
writeHeader("uniform vec3 ");
writeHeader(name);
writeHeader(";\n");
ShaderGlobalVec3 globalVec(name);
uniforms[name] = globalVec.getVecObject();
return ShaderGlobalVec3(globalVec);
}
i32 Shader::defineOutputVariable(const string &variableName, const char *typeName)
{
if(!isShaderVariableNameValid(variableName.c_str()))
throw ShaderInvalidAttributeName(variableName);
if(outputLocationCounter + 1 > maxAttribs)
throw ShaderTooManyAttributes(maxAttribs);
if(outputAttributes.find(variableName) != outputAttributes.end())
throw ShaderAttributeAlreadyDefined(variableName);
i32 attributeIndex = outputLocationCounter;
outputAttributes[variableName] = outputLocationCounter;
writeHeader("out ");
writeHeader(typeName);
writeHeader(" ");
writeHeader(variableName);
writeHeader(";\n");
ShaderAttribute shaderAttribute;
shaderAttribute.name = variableName;
shaderAttribute.typeName = typeName;
outputAttributeNames.push_back(shaderAttribute);
++outputLocationCounter;
return attributeIndex;
}
ShaderInputVec2 Shader::defineInputVec2(const std::string &name)
{
i32 attributeIndex = defineInputVariable(name, "vec2");
return ShaderInputVec2(this, attributeIndex);
}
i32 Shader::defineInputVariable(const string &variableName, const char *typeName)
{
if(!isShaderVariableNameValid(variableName.c_str()))
throw ShaderInvalidAttributeName(variableName);
if(inputLocationCounter + 1 > maxAttribs)
throw ShaderTooManyAttributes(maxAttribs);
if(inputAttributes.find(variableName) != inputAttributes.end())
throw ShaderAttributeAlreadyDefined(variableName);
i32 attributeIndex = inputLocationCounter;
inputAttributes[variableName] = inputLocationCounter;
ShaderAttribute shaderAttribute;
shaderAttribute.name = variableName;
shaderAttribute.typeName = typeName;
inputAttributeNames.push_back(shaderAttribute);
writeHeader("layout(location = ");
writeHeader(to_string(inputLocationCounter));
++inputLocationCounter;
writeHeader(") in ");
writeHeader(typeName);
writeHeader(" ");
writeHeader(variableName);
writeHeader(";\n");
return attributeIndex;
}
void Shader::assign(const ShaderOutputVec4 &lhsVariable, const ShaderVec4 &rhsVariable)
{
writeBody(lhsVariable.getName());
writeBody(" = ");
writeBody(rhsVariable.getOutput());
writeBody(";\n");
}
string Shader::build() const
{
std::string result;
result.reserve(header.size() + 2 + body.size());
result += header;
result += "\n";
result += body;
return result;
}
void Shader::writeHeader(const string &code)
{
header += code;
}
void Shader::writeBody(const string &code)
{
body += code;
}
}
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