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- /*
- * Copyright (C) 2020 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_RASTERIZER_HPP
- #define ANTKEEPER_RASTERIZER_HPP
-
- #include <cstdlib>
-
- class framebuffer;
- class vertex_array;
- class shader_program;
- enum class drawing_mode;
- enum class element_array_type;
-
- /**
- * Interface to the OpenGL state and drawing functions.
- */
- class rasterizer
- {
- public:
- /**
- * Creates a rasterizer. Warning: This must be called after an OpenGL context has been created.
- */
- rasterizer();
-
- /// Destroys a rasterizer.
- ~rasterizer();
-
- /**
- * 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.
- */
- void context_resized(int width, int height);
-
- /**
- * Sets the active framebuffer.
- *
- * @param framebuffer Framebuffer to use.
- */
- void use_framebuffer(const ::framebuffer& framebuffer);
-
- /**
- * Sets the color to be used when the color buffer of a framebuffer is cleared.
- *
- * @param r Red color component.
- * @param g Green color component.
- * @param b Blue color component.
- * @param a Alpha color component.
- */
- void set_clear_color(float r, float g, float b, float a);
-
- /**
- * Sets the depth value to be used when the depth buffer of a framebuffer is cleared.
- *
- * @param depth Depth value.
- */
- void set_clear_depth(float depth);
-
- /**
- * Sets the stencil value to be used when the stencil buffer of a framebuffer is cleared.
- *
- * @param s Stencil value.
- */
- void set_clear_stencil(int s);
-
- /**
- * Clears the buffers attached to a framebuffer.
- *
- * @param color Specifies whether the color buffer should be cleared.
- * @param depth Specifies whether the depth buffer should be cleared.
- * @param stencil Specifies whether the stencil buffer should be cleared.
- */
- void clear_framebuffer(bool color, bool depth, bool stencil);
-
- /**
- * Sets the active viewport.
- *
- * @param x X-coordinate of the viewport.
- * @param y Y-coordinate of the viewport.
- * @param width Width of the viewport.
- * @param height Height of the viewport.
- */
- void set_viewport(int x, int y, int width, int height);
-
- /**
- * Binds a shader program.
- *
- * @param program Shader program to bind.
- */
- void use_program(const shader_program& program);
-
- /**
- *
- */
- void draw_arrays(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count);
-
- void draw_arrays_instanced(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count, std::size_t instance_count);
-
- /**
- *
- */
- void draw_elements(const vertex_array& vao, drawing_mode mode, std::size_t offset, std::size_t count, element_array_type type);
-
- /**
- * Returns the default framebuffer associated with the OpenGL context of a window.
- */
- const framebuffer& get_default_framebuffer() const;
-
- private:
- framebuffer* default_framebuffer;
- const framebuffer* bound_framebuffer;
- const vertex_array* bound_vao;
- const shader_program* bound_shader_program;
- };
-
- inline const framebuffer& rasterizer::get_default_framebuffer() const
- {
- return *default_framebuffer;
- }
-
- #endif // ANTKEEPER_RASTERIZER_HPP
-
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