rmlrenderinterface.h

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/* Conquer Space
 * Copyright (C) 2021-2023 Conquer Space
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include <RmlUi/Core.h>
#include <spdlog/spdlog.h>
 
#include <memory>
 
#include <glm/glm.hpp>
 
#include "engine/engine.h"
#include "engine/graphics/shader.h"
 
namespace cqsp::engine {
class CQSPRenderInterface : public Rml::RenderInterface {
 public:
    explicit CQSPRenderInterface(Application& app);
    ~CQSPRenderInterface() = default;
 
    void RenderGeometry(Rml::Vertex* vertices, int num_vertices, int* indices, int num_indices,
                        Rml::TextureHandle texture, const Rml::Vector2f& translation) override;
 
    Rml::CompiledGeometryHandle CompileGeometry(Rml::Vertex* vertices, int num_vertices, int* indices, int num_indices,
                                                Rml::TextureHandle texture) override;
 
    void RenderCompiledGeometry(Rml::CompiledGeometryHandle geometry, const Rml::Vector2f& translation) override;
 
    void ReleaseCompiledGeometry(Rml::CompiledGeometryHandle geometry) override;
 
    void EnableScissorRegion(bool enable) override;
 
    void SetScissorRegion(int x, int y, int width, int height) override;
 
    bool LoadTexture(Rml::TextureHandle& texture_handle, Rml::Vector2i& texture_dimensions,
                     const Rml::String& source) override;
 
    bool GenerateTexture(Rml::TextureHandle& texture_handle, const Rml::byte* source,
                         const Rml::Vector2i& source_dimensions) override;
 
    void ReleaseTexture(Rml::TextureHandle texture) override;
 
    void SetTransform(const Rml::Matrix4f* transform) override;
 
    // In the past the general idea was to present the ui on a separate
    // frame buffer, but since frame buffers are kinda wacky with their
    // alpha values, i choose not to do that.
    void PrepareRenderBuffer();
    void PresentRenderBuffer();
 
 private:
    Application& app;
    asset::Shader vert_shader;
    asset::Shader frag_shader;
    asset::Shader texture_frag_shader;
 
    // Shaders
    cqsp::asset::ShaderProgram_t color_shader;
    cqsp::asset::ShaderProgram_t texture_shader;
    bool m_transform_enabled = false;
    glm::mat4 m_transform_matrix = glm::mat4(1.0);
 
    int counter = 0;
    std::shared_ptr<spdlog::logger> logger;
};
}  // namespace cqsp::engine