BackendRenderTargetGLES2.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2021 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
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// 3. This notice may not be removed or altered from any source distribution.
//
 
 
#ifndef TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
#define TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
 
#include <TGUI/Backend/Renderer/BackendRenderTarget.hpp>
#include <TGUI/Backend/Renderer/GLES2/BackendTextureGLES2.hpp>
 
 
namespace tgui
{
 class TGUI_API BackendRenderTargetGLES2 : public BackendRenderTarget
 {
 public:
 
 BackendRenderTargetGLES2();
 
 
 ~BackendRenderTargetGLES2();
 
 
 void setClearColor(const Color& color) override;
 
 
 void clearScreen() override;
 
 
 void setView(FloatRect view, FloatRect viewport, Vector2f targetSize) override;
#ifndef TGUI_REMOVE_DEPRECATED_CODE
 using BackendRenderTarget::setView;
#endif
 
 void drawGui(const std::shared_ptr<RootContainer>& root) override;
 
 
 void drawVertexArray(const RenderStates& states, const Vertex* vertices, std::size_t vertexCount,
 const int* indices, std::size_t indexCount, const std::shared_ptr<BackendTexture>& texture) override;
 
 
 protected:
 
 
 void updateClipping(FloatRect clipRect, FloatRect clipViewport) override;
 
 
 // Calls glEnableVertexAttribArray and glVertexAttribPointer.
 // Called only once when using a VAO (GLES 3.x), but on every draw when using GLES 2.0
 void setVertexAttribs();
 
 
 // Creates the vertex and index buffers
 void createBuffers();
 
 
 // Changes the bound texture if another texture was currently set
 void changeTexture(unsigned int textureId, bool force = false);
 
 
 protected:
 
 unsigned int m_shaderProgram = 0;
 unsigned int m_vertexArray = 0;
 unsigned int m_vertexBuffer = 0;
 unsigned int m_indexBuffer = 0;
 std::size_t m_vertexBufferSize = 0;
 std::size_t m_indexBufferSize = 0;
 
 std::unique_ptr<BackendTextureGLES2> m_emptyTexture;
 std::shared_ptr<BackendTextureGLES2> m_currentTexture;
 
 Transform m_projectionTransform;
 int m_projectionMatrixShaderUniformLocation = 0;
 int m_positionShaderLocation = 0;
 int m_colorShaderLocation = 1;
 int m_texCoordShaderLocation = 2;
 };
 
}
 
 
#endif // TGUI_BACKEND_RENDER_TARGET_GLES2_HPP