TGUI  0.10-dev
BackendRenderTargetGLES2.hpp
1
2//
3// TGUI - Texus' Graphical User Interface
4// Copyright (C) 2012-2021 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//
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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
83 void drawGui(const std::shared_ptr<RootContainer>& root) override;
84
85
96 void drawVertexArray(const RenderStates& states, const Vertex* vertices, std::size_t vertexCount,
97 const int* indices, std::size_t indexCount, const std::shared_ptr<BackendTexture>& texture) override;
98
99
101 protected:
102
103
112 void updateClipping(FloatRect clipRect, FloatRect clipViewport) override;
113
114
116 // Calls glEnableVertexAttribArray and glVertexAttribPointer.
117 // Called only once when using a VAO (GLES 3.x), but on every draw when using GLES 2.0
119 void setVertexAttribs();
120
121
123 // Creates the vertex and index buffers
125 void createBuffers();
126
127
129 // Changes the bound texture if another texture was currently set
131 void changeTexture(unsigned int textureId, bool force = false);
132
133
135 protected:
136
137 unsigned int m_shaderProgram = 0;
138 unsigned int m_vertexArray = 0;
139 unsigned int m_vertexBuffer = 0;
140 unsigned int m_indexBuffer = 0;
141 std::size_t m_vertexBufferSize = 0;
142 std::size_t m_indexBufferSize = 0;
143
144 std::unique_ptr<BackendTextureGLES2> m_emptyTexture;
145 std::shared_ptr<BackendTextureGLES2> m_currentTexture;
146
147 Transform m_projectionTransform;
148 int m_projectionMatrixShaderUniformLocation = 0;
149 int m_positionShaderLocation = 0;
150 int m_colorShaderLocation = 1;
151 int m_texCoordShaderLocation = 2;
152 };
153
155}
156
158
159#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