💿🐜 Antkeeper source code
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141 lines
3.8 KiB
141 lines
3.8 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_GL_RASTERIZER_HPP
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#define ANTKEEPER_GL_RASTERIZER_HPP
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#include <cstdlib>
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namespace gl {
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class framebuffer;
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class vertex_array;
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class shader_program;
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enum class drawing_mode;
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enum class element_array_type;
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/**
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* Interface to the OpenGL state and drawing functions.
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*/
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class rasterizer
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{
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public:
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/**
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* Creates a rasterizer. Warning: This must be called after an OpenGL context has been created.
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*/
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rasterizer();
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/// Destroys a rasterizer.
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~rasterizer();
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/**
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* This should be called when the window associated with the OpenGL context is resized, and will effectively changed the reported dimensions of the default framebuffer.
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*/
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void context_resized(int width, int height);
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/**
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* Sets the active framebuffer.
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*
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* @param framebuffer Framebuffer to use.
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*/
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void use_framebuffer(const framebuffer& framebuffer);
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/**
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* Sets the color to be used when the color buffer of a framebuffer is cleared.
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*
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* @param r Red color component.
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* @param g Green color component.
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* @param b Blue color component.
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* @param a Alpha color component.
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*/
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void set_clear_color(float r, float g, float b, float a);
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/**
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* Sets the depth value to be used when the depth buffer of a framebuffer is cleared.
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*
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* @param depth Depth value.
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*/
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void set_clear_depth(float depth);
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/**
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* Sets the stencil value to be used when the stencil buffer of a framebuffer is cleared.
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*
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* @param s Stencil value.
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*/
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void set_clear_stencil(int s);
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/**
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* Clears the buffers attached to a framebuffer.
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*
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* @param color Specifies whether the color buffer should be cleared.
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* @param depth Specifies whether the depth buffer should be cleared.
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* @param stencil Specifies whether the stencil buffer should be cleared.
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*/
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void clear_framebuffer(bool color, bool depth, bool stencil);
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/**
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* Sets the active viewport.
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*
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* @param x X-coordinate of the viewport.
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* @param y Y-coordinate of the viewport.
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* @param width Width of the viewport.
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* @param height Height of the viewport.
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*/
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void set_viewport(int x, int y, int width, int height);
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/**
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* Binds a shader program.
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*
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* @param program Shader program to bind.
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*/
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void use_program(const shader_program& program);
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/**
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*
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*/
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void draw_arrays(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count);
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void draw_arrays_instanced(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count, std::size_t instance_count);
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/**
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*
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*/
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void draw_elements(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count, element_array_type type);
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/**
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* Returns the default framebuffer associated with the OpenGL context of a window.
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*/
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const framebuffer& get_default_framebuffer() const;
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private:
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framebuffer* default_framebuffer;
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const framebuffer* bound_framebuffer;
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const vertex_array* bound_vao;
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const shader_program* bound_shader_program;
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};
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inline const framebuffer& rasterizer::get_default_framebuffer() const
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{
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return *default_framebuffer;
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}
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} // namespace gl
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#endif // ANTKEEPER_GL_RASTERIZER_HPP
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