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
|
/* RenderBuffer.h
Copyright (c) 2023 by thewierdnut
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "Point.h"
#include "Screen.h"
// Class that can redirect all drawing commands to an internal texture.
// This buffer uses coordinates from (0, 0) in the top left, to (width, height)
// in the bottom right.
class RenderBuffer {
public:
// RAII wrapper to prevent accidentally not unbinding the render target.
class RenderTargetGuard final {
public:
~RenderTargetGuard();
// Explicitly deactivate render target;
void Deactivate();
protected:
RenderTargetGuard(RenderBuffer &b, int screenWidth, int screenHeight);
private:
RenderBuffer &buffer;
Screen::ScreenDimensionsGuard screenGuard;
friend class RenderBuffer;
};
public:
// Create a texture of the given size that can be used as a render target.
RenderBuffer(const Point &dimensions);
virtual ~RenderBuffer();
// Initialize the shaders used internally.
static void Init();
// Turn this buffer on as a render target. The render target is restored if
// the Activation object goes out of scope.
[[nodiscard]] RenderTargetGuard SetTarget();
// Draw the contents of this buffer at the specified position.
void Draw(const Point &position);
// Draw the contents of this buffer at the specified position, clipping the contents.
void Draw(const Point &position, const Point &clipsize, const Point &srcposition = Point());
double Top() const;
double Bottom() const;
double Left() const;
double Right() const;
const Point &Dimensions() const;
double Height() const;
double Width() const;
void SetFadePadding(float top, float bottom, float right = 0, float left = 0);
protected:
void Deactivate();
private:
Point size;
unsigned int texid = -1;
unsigned int framebuffer = -1;
unsigned int lastFramebuffer = 0;
int lastViewport[4] = {};
float fadePadding[4] = {};
Point multiplier;
};
|
