void ShaderManager::LoadShader(ShaderName shaderName, const char* vshFilename, const char *fshFilename, const char *gshFilename)
{
std::string vShaderSrc = ReadShaderFromFile(vshFilename);
std::string fShaderSrc = ReadShaderFromFile(fshFilename);
CompileShader(&m_shaderProgram[shaderName].vertShader, GL_VERTEX_SHADER, vShaderSrc.c_str());
if (strlen(gshFilename) > 0)
{
std::string gShaderSrc = ReadShaderFromFile(gshFilename);
CompileShader(&m_shaderProgram[shaderName].geomShader, GL_GEOMETRY_SHADER, gShaderSrc.c_str());
}
CompileShader(&m_shaderProgram[shaderName].fragShader, GL_FRAGMENT_SHADER, fShaderSrc.c_str());
LinkShader(&m_shaderProgram[shaderName].id,
m_shaderProgram[shaderName].vertShader,
m_shaderProgram[shaderName].fragShader,
m_shaderProgram[shaderName].geomShader);
glUniform1i(glGetUniformLocation(m_shaderProgram[shaderName].id, "sTexture"), 0); // Texture unit 0 is the primary texture.
// Store the location of uniforms for later use
for (int j = 0; j < NUM_UNIFORMS; ++j)
{
m_shaderProgram[shaderName].uniforms[j] = glGetUniformLocation(m_shaderProgram[shaderName].id, uniformNames[j]);
}
}
GLuint ShaderManager::Get (std::string shaderPath)
{
GLuint shader = _shaderMap[shaderPath];
if (!shader)
{
char* shaderText = ReadShaderFromFile(shaderPath);
shader = CompileShader(shaderText);
delete shaderText;
_shaderMap[shaderPath] = shader;
}
return shader;
}