56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
#pragma once
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#include <stdexcept>
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#include <GL/glew.h>
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namespace ugly{
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/**
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* \brief Builder class for OpenGL shader and programs.
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*
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* On initialization, creates a new OpenGL program. Attach and compile shader
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* sources using `attachFrom*`. Link and get the program with `link()`. User is
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* responsible of managing returned program's lifetime, including destroying it.
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*/
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class ShaderProgramBuilder {
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private:
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GLuint mProgram;
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public:
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ShaderProgramBuilder();
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~ShaderProgramBuilder();
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/**
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* \brief Deletes program and starts from scratch.
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*/
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void reset();
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/**
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* \brief Creates, compiles, and attaches a shader.
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* \param type Specifies the type of shader to be created. Must be one of
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* \c GL_VERTEX_SHADER, \c GL_GEOMETRY_SHADER or
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* \c GL_FRAGMENT_SHADER .
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* \param string Shader source code.
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* \param length Bytes to read from \p string, \c 0 reads until NUL byte.
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* \returns *this
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*/
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ShaderProgramBuilder &attachFromMemory(GLenum type, const GLchar *string, GLint length = 0);
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/**
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* \brief Creates, compiles, and attaches a shader. Reads source from file.
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* \param type Specifies the type of shader to be created. Must be one of
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* \c GL_VERTEX_SHADER, \c GL_GEOMETRY_SHADER or
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* \c GL_FRAGMENT_SHADER .
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* \param filename Shader source code file.
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* \returns \c *this
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*/
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ShaderProgramBuilder &attachFromFile(GLenum type, const char *filename);
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/**
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* \brief Links OpenGL program after attaching sources.
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*
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* After this function is called the builder object is reset.
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* \return OpenGL object name. User is reponsible for managing it.
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*/
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[[nodiscard]] GLuint link();
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};
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}
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