1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
//
// 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.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Graphics/RenderTarget.hpp>
#include <SFML/Graphics/Drawable.hpp>
#include <SFML/Graphics/GraphicsContext.hpp>
#include <iostream>
namespace sf
{
////////////////////////////////////////////////////////////
/// Default constructor
////////////////////////////////////////////////////////////
RenderTarget::RenderTarget() :
myCurrentView (&myDefaultView),
myPreserveStates(false),
myIsDrawing (false)
{
}
////////////////////////////////////////////////////////////
/// Destructor
////////////////////////////////////////////////////////////
RenderTarget::~RenderTarget()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
/// Clear the entire target with a single color
////////////////////////////////////////////////////////////
void RenderTarget::Clear(const Color& FillColor)
{
if (Activate(true))
{
// Clear the frame buffer
GLCheck(glClearColor(FillColor.r / 255.f, FillColor.g / 255.f, FillColor.b / 255.f, FillColor.a / 255.f));
GLCheck(glClear(GL_COLOR_BUFFER_BIT));
Activate(false);
}
}
////////////////////////////////////////////////////////////
/// Draw something on the window
////////////////////////////////////////////////////////////
void RenderTarget::Draw(const Drawable& Object)
{
// Check whether we are called from the outside or from a previous call to Draw
if (!myIsDrawing)
{
myIsDrawing = true;
// Set our target as the current target for rendering
if (Activate(true))
{
// Save the current render states and set the SFML ones
if (myPreserveStates)
{
GLCheck(glPushAttrib(GL_COLOR_BUFFER_BIT | GL_CURRENT_BIT | GL_ENABLE_BIT |
GL_TEXTURE_BIT | GL_TRANSFORM_BIT | GL_VIEWPORT_BIT));
GLCheck(glMatrixMode(GL_MODELVIEW)); GLCheck(glPushMatrix());
GLCheck(glMatrixMode(GL_PROJECTION)); GLCheck(glPushMatrix());
SetRenderStates();
}
// Set the window viewport and transform matrices
GLCheck(glViewport(0, 0, GetWidth(), GetHeight()));
GLCheck(glMatrixMode(GL_PROJECTION)); GLCheck(glLoadMatrixf(myCurrentView->GetMatrix().Get4x4Elements()));
GLCheck(glMatrixMode(GL_MODELVIEW)); GLCheck(glLoadIdentity());
// Let the object draw itself
Object.Draw(*this);
// Restore render states
if (myPreserveStates)
{
GLCheck(glMatrixMode(GL_PROJECTION)); GLCheck(glPopMatrix());
GLCheck(glMatrixMode(GL_MODELVIEW)); GLCheck(glPopMatrix());
GLCheck(glPopAttrib());
}
// Deactivate rendering on this target
Activate(false);
}
myIsDrawing = false;
}
else
{
// We are already called from a previous Draw : we don't need to set the states again, just draw the object
Object.Draw(*this);
}
}
////////////////////////////////////////////////////////////
/// Change the current active view
////////////////////////////////////////////////////////////
void RenderTarget::SetView(const View& NewView)
{
myCurrentView = &NewView;
}
////////////////////////////////////////////////////////////
/// Get the current view
////////////////////////////////////////////////////////////
const View& RenderTarget::GetView() const
{
return *myCurrentView;
}
////////////////////////////////////////////////////////////
/// Get the default view of the window for read / write
////////////////////////////////////////////////////////////
View& RenderTarget::GetDefaultView()
{
return myDefaultView;
}
////////////////////////////////////////////////////////////
/// Tell SFML to preserve external OpenGL states, at the expense of
/// more CPU charge. Use this function if you don't want SFML
/// to mess up your own OpenGL states (if any).
/// Don't enable state preservation if not needed, as it will allow
/// SFML to do internal optimizations and improve performances.
/// This parameter is false by default
////////////////////////////////////////////////////////////
void RenderTarget::PreserveOpenGLStates(bool Preserve)
{
myPreserveStates = Preserve;
}
////////////////////////////////////////////////////////////
/// Called by the derived class when it's ready to be initialized
////////////////////////////////////////////////////////////
void RenderTarget::Initialize()
{
// Set the default rendering states
SetRenderStates();
// Setup the default view
myDefaultView.SetFromRect(FloatRect(0, 0, static_cast<float>(GetWidth()), static_cast<float>(GetHeight())));
SetView(myDefaultView);
}
////////////////////////////////////////////////////////////
/// Set the OpenGL render states needed for the SFML rendering
////////////////////////////////////////////////////////////
void RenderTarget::SetRenderStates()
{
GLCheck(glDisable(GL_ALPHA_TEST));
GLCheck(glDisable(GL_DEPTH_TEST));
GLCheck(glDisable(GL_LIGHTING));
}
} // namespace sf
|
