RmlUi/Backends/RmlUi_Renderer_SDL.h

/*
 * This source file is part of RmlUi, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://github.com/mikke89/RmlUi
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 * Copyright (c) 2019-2023 The RmlUi Team, and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#ifndef RMLUI_BACKENDS_RENDERER_SDL_H
#define RMLUI_BACKENDS_RENDERER_SDL_H

#include <RmlUi/Core/RenderInterface.h>

#if RMLUI_SDL_VERSION_MAJOR == 3
	#include <SDL3/SDL.h>
#elif RMLUI_SDL_VERSION_MAJOR == 2
	#include <SDL.h>
#else
	#error "Unspecified RMLUI_SDL_VERSION_MAJOR. Please set this definition to the major version of the SDL library being linked to."
#endif

class RenderInterface_SDL : public Rml::RenderInterface {
public:
	RenderInterface_SDL(SDL_Renderer* renderer);

	// Sets up OpenGL states for taking rendering commands from RmlUi.
	void BeginFrame();
	void EndFrame();

	// -- Inherited from Rml::RenderInterface --

	Rml::CompiledGeometryHandle CompileGeometry(Rml::Span<const Rml::Vertex> vertices, Rml::Span<const int> indices) override;
	void ReleaseGeometry(Rml::CompiledGeometryHandle geometry) override;
	void RenderGeometry(Rml::CompiledGeometryHandle handle, Rml::Vector2f translation, Rml::TextureHandle texture) override;

	Rml::TextureHandle LoadTexture(Rml::Vector2i& texture_dimensions, const Rml::String& source) override;
	Rml::TextureHandle GenerateTexture(Rml::Span<const Rml::byte> source, Rml::Vector2i source_dimensions) override;
	void ReleaseTexture(Rml::TextureHandle texture_handle) override;

	void EnableScissorRegion(bool enable) override;
	void SetScissorRegion(Rml::Rectanglei region) override;

private:
	struct GeometryView {
		Rml::Span<const Rml::Vertex> vertices;
		Rml::Span<const int> indices;
	};

	SDL_Renderer* renderer;
	SDL_BlendMode blend_mode = {};
	SDL_Rect rect_scissor = {};
	bool scissor_region_enabled = false;
};

#endif