277 lines
8.4 KiB
C++
277 lines
8.4 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_GRAPHICS_POST_PROCESS_H
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#define BLT_GRAPHICS_POST_PROCESS_H
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#include <blt/std/types.h>
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#include <blt/gfx/framebuffer.h>
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#include <blt/gfx/shader.h>
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#include <blt/gfx/model.h>
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#include <blt/gfx/state.h>
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#include <vector>
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#include <memory>
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#include <blt/std/assert.h>
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namespace blt::gfx
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{
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class pp_engine_t;
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class pp_step_t;
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enum class pp_request_t : u64
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{
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BIND_BUFFER = 0x1,
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CLEAR_BUFFER = 0x2
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};
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class pp_step_t
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{
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public:
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virtual void create()
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{}
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// only called on render()
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virtual void draw(frame_buffer_t&)
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{}
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// only called on bind()
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virtual void draw()
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{}
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// called after rendering, provides previous framebuffer
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virtual void post_draw(frame_buffer_t&)
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{}
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auto& getBuffer()
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{
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return draw_buffer;
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}
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auto& getShader()
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{
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return *shader;
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}
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bool hasShader()
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{
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return shader != nullptr;
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}
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virtual bool requests(pp_request_t)
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{
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return true;
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}
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virtual ~pp_step_t() = default;
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protected:
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frame_buffer_t draw_buffer;
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std::unique_ptr<shader_t> shader;
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};
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class pp_in_place_t : public pp_step_t
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{
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public:
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pp_in_place_t(frame_buffer_t::attachment_t from): from(from), to(from)
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{}
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pp_in_place_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to): from(from), to(to)
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{}
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bool requests(blt::gfx::pp_request_t request) override
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{
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return static_cast<u64>(request) & ~(static_cast<u64>(pp_request_t::BIND_BUFFER) | static_cast<u64>(pp_request_t::CLEAR_BUFFER));
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}
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protected:
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frame_buffer_t::attachment_t from;
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frame_buffer_t::attachment_t to;
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};
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class pp_render_target_t : public pp_step_t
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{
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public:
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void create() override;
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void draw() override;
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};
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class pp_to_screen_step_t : public pp_step_t
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{
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public:
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void create() override;
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void draw(frame_buffer_t& previous) override;
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};
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class pp_outline_target_t : public pp_step_t
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{
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public:
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void create() override;
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void draw() override;
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};
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class pp_outline_step_t : public pp_step_t
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{
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public:
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pp_outline_step_t(matrix_state_manager& manager): manager(manager)
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{}
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void create() override;
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void draw(frame_buffer_t& previous) override;
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private:
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matrix_state_manager& manager;
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};
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class pp_blur_step_base_t : public pp_step_t
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{
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public:
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pp_blur_step_base_t(frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2):
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from(from), to(from), x_blur(x_blur), y_blur(y_blur)
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{}
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pp_blur_step_base_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2, i32 y_blur = 2):
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from(from), to(to), x_blur(x_blur), y_blur(y_blur)
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{}
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protected:
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frame_buffer_t::attachment_t from;
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frame_buffer_t::attachment_t to;
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i32 x_blur;
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i32 y_blur;
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};
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class pp_blur_step_t : public pp_blur_step_base_t
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{
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public:
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pp_blur_step_t(frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2): pp_blur_step_base_t(from, x_blur, y_blur)
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{}
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pp_blur_step_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2, i32 y_blur = 2):
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pp_blur_step_base_t(from, to, x_blur, y_blur)
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{}
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void create() override;
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void draw(frame_buffer_t& previous);
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};
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class pp_blur_step_inplace_t : public pp_blur_step_base_t
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{
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public:
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pp_blur_step_inplace_t(matrix_state_manager& manager, frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2):
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pp_blur_step_base_t(from, x_blur, y_blur), manager(manager)
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{}
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pp_blur_step_inplace_t(matrix_state_manager& manager, frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2,
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i32 y_blur = 2):
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pp_blur_step_base_t(from, to, x_blur, y_blur), manager(manager)
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{}
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void create() override;
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void draw(frame_buffer_t& previous);
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void post_draw(frame_buffer_t& previous) override;
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bool requests(blt::gfx::pp_request_t request) override
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{
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return static_cast<u64>(request) & ~(static_cast<u64>(pp_request_t::BIND_BUFFER) | static_cast<u64>(pp_request_t::CLEAR_BUFFER));
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}
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private:
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std::unique_ptr<shader_t> shader_pass;
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matrix_state_manager& manager;
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};
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class pp_expansion_step_inplace_t : public pp_in_place_t
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{
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public:
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pp_expansion_step_inplace_t(frame_buffer_t::attachment_t from, const vec4& multiplier = vec4{2,2,2,2}):
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pp_in_place_t(from), multiplier(multiplier)
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{}
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pp_expansion_step_inplace_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to,
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const vec4& multiplier = vec4{2,2,2,2}):
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pp_in_place_t(from, to), multiplier(multiplier)
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{}
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void create() override;
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void draw(frame_buffer_t& previous);
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private:
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vec4 multiplier;
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};
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class pp_engine_t
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{
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public:
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void create();
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void bind();
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void render();
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void cleanup();
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void addStep(std::unique_ptr<pp_step_t> step)
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{
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steps.emplace_back(std::move(step));
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}
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static std::unique_ptr<shader_t> createShader(std::string_view fragment);
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static std::unique_ptr<pp_engine_t> make_basic_pp()
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{
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return make_single_pp(std::make_unique<pp_render_target_t>());
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}
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static std::unique_ptr<pp_engine_t> make_single_pp(std::unique_ptr<pp_step_t> step)
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{
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auto engine = new pp_engine_t();
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engine->addStep(std::move(step));
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return std::unique_ptr<pp_engine_t>(engine);
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}
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template<typename... Args>
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static std::unique_ptr<pp_engine_t> make_multi_pp(Args... steps)
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{
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auto engine = new pp_engine_t();
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(engine->addStep(std::move(steps)), ...);
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return std::unique_ptr<pp_engine_t>(engine);
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}
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static void render_quad();
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private:
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pp_engine_t() = default;
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pp_step_t& find_last_frame_buffer(size_t index);
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std::vector<std::unique_ptr<pp_step_t>> steps;
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std::unique_ptr<vertex_array_t> screen_vao;
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};
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}
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#endif //BLT_GRAPHICS_POST_PROCESS_H
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