TGUI  1.3.0
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BackendRenderTargetGLES2.hpp
1
2//
3// TGUI - Texus' Graphical User Interface
4// Copyright (C) 2012-2024 Bruno Van de Velde (vdv_b@tgui.eu)
5//
6// This software is provided 'as-is', without any express or implied warranty.
7// In no event will the authors be held liable for any damages arising from the use of this software.
8//
9// Permission is granted to anyone to use this software for any purpose,
10// including commercial applications, and to alter it and redistribute it freely,
11// subject to the following restrictions:
12//
13// 1. The origin of this software must not be misrepresented;
14// you must not claim that you wrote the original software.
15// If you use this software in a product, an acknowledgment
16// in the product documentation would be appreciated but is not required.
17//
18// 2. Altered source versions must be plainly marked as such,
19// and must not be misrepresented as being the original software.
20//
21// 3. This notice may not be removed or altered from any source distribution.
22//
24
25
26#ifndef TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
27#define TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
28
29#include <TGUI/Backend/Renderer/GLES2/BackendTextureGLES2.hpp>
30
31#if !TGUI_BUILD_AS_CXX_MODULE
32 #include <TGUI/Backend/Renderer/BackendRenderTarget.hpp>
33#endif
34
36
37TGUI_MODULE_EXPORT namespace tgui
38{
43 {
44 public:
45
50
51
56
57
62 void setClearColor(const Color& color) override;
63
64
68 void clearScreen() override;
69
70
78 void setView(FloatRect view, FloatRect viewport, Vector2f targetSize) override;
79
80
88 void drawGui(const std::shared_ptr<RootContainer>& root) override;
89
90
101 void drawVertexArray(const RenderStates& states, const Vertex* vertices, std::size_t vertexCount,
102 const unsigned int* indices, std::size_t indexCount, const std::shared_ptr<BackendTexture>& texture) override;
103
104
106 protected:
107
108
117 void updateClipping(FloatRect clipRect, FloatRect clipViewport) override;
118
119
121 // Calls glEnableVertexAttribArray and glVertexAttribPointer.
122 // Called only once when using a VAO (GLES 3.x), but on every draw when using GLES 2.0
124 void setVertexAttribs();
125
126
128 // Creates the vertex and index buffers
130 void createBuffers();
131
132
134 protected:
135
136 unsigned int m_shaderProgram = 0;
137 unsigned int m_vertexArray = 0;
138 unsigned int m_vertexBuffer = 0;
139 unsigned int m_indexBuffer = 0;
140 std::size_t m_vertexBufferSize = 0;
141 std::size_t m_indexBufferSize = 0;
142
143 std::unique_ptr<BackendTextureGLES2> m_emptyTexture;
144 std::shared_ptr<BackendTextureGLES2> m_currentTexture;
145
146 Transform m_projectionTransform;
147 int m_projectionMatrixShaderUniformLocation = 0;
148 unsigned int m_positionShaderLocation = 0;
149 unsigned int m_colorShaderLocation = 1;
150 unsigned int m_texCoordShaderLocation = 2;
151 };
152
154}
155
157
158#endif // TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
Render target implementation that makes use of OpenGL ES.
Definition BackendRenderTargetGLES2.hpp:43
~BackendRenderTargetGLES2() override
Destructor.
void drawVertexArray(const RenderStates &states, const Vertex *vertices, std::size_t vertexCount, const unsigned int *indices, std::size_t indexCount, const std::shared_ptr< BackendTexture > &texture) override
Draws a vertex array. This is called by the other draw functions.
void drawGui(const std::shared_ptr< RootContainer > &root) override
Draws the gui and all of its widgets.
BackendRenderTargetGLES2()
Default constructor.
void clearScreen() override
Clears the screen, called at the beginning of each frame when gui.mainLoop() is called.
void setView(FloatRect view, FloatRect viewport, Vector2f targetSize) override
Informs the render target about which part of the window is used for rendering.
void updateClipping(FloatRect clipRect, FloatRect clipViewport) override
Called from addClippingLayer and removeClippingLayer to apply the clipping.
void setClearColor(const Color &color) override
Select the color that will be used by clearScreen.
Base class for render targets.
Definition BackendRenderTarget.hpp:48
Wrapper for colors.
Definition Color.hpp:74
Defines a transform matrix.
Definition Transform.hpp:47
Namespace that contains all TGUI functions and classes.
Definition AbsoluteOrRelativeValue.hpp:39
States used for drawing.
Definition RenderStates.hpp:39
Definition Vertex.hpp:40