TGUI  1.0-alpha
BackendRenderTargetGLES2.hpp
1
2//
3// TGUI - Texus' Graphical User Interface
4// Copyright (C) 2012-2022 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/BackendRenderTarget.hpp>
30#include <TGUI/Backend/Renderer/GLES2/BackendTextureGLES2.hpp>
31
33
34namespace tgui
35{
40 {
41 public:
42
47
48
53
54
59 void setClearColor(const Color& color) override;
60
61
65 void clearScreen() override;
66
67
75 void setView(FloatRect view, FloatRect viewport, Vector2f targetSize) override;
76
77
85 void drawGui(const std::shared_ptr<RootContainer>& root) override;
86
87
98 void drawVertexArray(const RenderStates& states, const Vertex* vertices, std::size_t vertexCount,
99 const int* indices, std::size_t indexCount, const std::shared_ptr<BackendTexture>& texture) override;
100
101
103 protected:
104
105
114 void updateClipping(FloatRect clipRect, FloatRect clipViewport) override;
115
116
118 // Calls glEnableVertexAttribArray and glVertexAttribPointer.
119 // Called only once when using a VAO (GLES 3.x), but on every draw when using GLES 2.0
121 void setVertexAttribs();
122
123
125 // Creates the vertex and index buffers
127 void createBuffers();
128
129
131 protected:
132
133 unsigned int m_shaderProgram = 0;
134 unsigned int m_vertexArray = 0;
135 unsigned int m_vertexBuffer = 0;
136 unsigned int m_indexBuffer = 0;
137 std::size_t m_vertexBufferSize = 0;
138 std::size_t m_indexBufferSize = 0;
139
140 std::unique_ptr<BackendTextureGLES2> m_emptyTexture;
141 std::shared_ptr<BackendTextureGLES2> m_currentTexture;
142
143 Transform m_projectionTransform;
144 int m_projectionMatrixShaderUniformLocation = 0;
145 int m_positionShaderLocation = 0;
146 int m_colorShaderLocation = 1;
147 int m_texCoordShaderLocation = 2;
148 };
149
151}
152
154
155#endif // TGUI_BACKEND_RENDER_TARGET_GLES2_HPP
Render target implementation that makes use of OpenGL ES.
Definition: BackendRenderTargetGLES2.hpp:40
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
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.
~BackendRenderTargetGLES2()
Destructor.
Base class for render targets.
Definition: BackendRenderTarget.hpp:48
Wrapper for colors.
Definition: Color.hpp:63
Defines a transform matrix.
Definition: Transform.hpp:43
Namespace that contains all TGUI functions and classes.
Definition: AbsoluteOrRelativeValue.hpp:36
States used for drawing.
Definition: RenderStates.hpp:39
Definition: Vertex.hpp:37