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
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file opengl.h OpenGL video driver support. */
#ifndef VIDEO_OPENGL_H
#define VIDEO_OPENGL_H
#include "../core/alloc_type.hpp"
#include "../core/geometry_type.hpp"
#include "../gfx_type.h"
#include "../spriteloader/spriteloader.hpp"
#include "../misc/lrucache.hpp"
typedef void (*OGLProc)();
typedef OGLProc (*GetOGLProcAddressProc)(const char *proc);
bool IsOpenGLVersionAtLeast(byte major, byte minor);
const char *FindStringInExtensionList(const char *string, const char *substring);
class OpenGLSprite;
/** Platform-independent back-end class for OpenGL video drivers. */
class OpenGLBackend : public ZeroedMemoryAllocator, SpriteEncoder {
private:
static OpenGLBackend *instance; ///< Singleton instance pointer.
bool persistent_mapping_supported; ///< Persistent pixel buffer mapping supported.
GLsync sync_vid_mapping; ///< Sync object for the persistently mapped video buffer.
GLsync sync_anim_mapping; ///< Sync object for the persistently mapped animation buffer.
void *vid_buffer; ///< Pointer to the mapped video buffer.
GLuint vid_pbo; ///< Pixel buffer object storing the memory used for the video driver to draw to.
GLuint vid_texture; ///< Texture handle for the video buffer texture.
GLuint vid_program; ///< Shader program for rendering a RGBA video buffer.
GLuint pal_program; ///< Shader program for rendering a paletted video buffer.
GLuint vao_quad; ///< Vertex array object storing the rendering state for the fullscreen quad.
GLuint vbo_quad; ///< Vertex buffer with a fullscreen quad.
GLuint pal_texture; ///< Palette lookup texture.
void *anim_buffer; ///< Pointer to the mapped animation buffer.
GLuint anim_pbo; ///< Pixel buffer object storing the memory used for the animation buffer.
GLuint anim_texture; ///< Texture handle for the animation buffer texture.
GLuint remap_program; ///< Shader program for blending and rendering a RGBA + remap texture.
GLint remap_sprite_loc; ///< Uniform location for sprite parameters.
GLint remap_screen_loc; ///< Uniform location for screen size;
GLint remap_zoom_loc; ///< Uniform location for sprite zoom;
GLint remap_rgb_loc; ///< Uniform location for RGB mode flag;
GLuint sprite_program; ///< Shader program for blending and rendering a sprite to the video buffer.
GLint sprite_sprite_loc; ///< Uniform location for sprite parameters.
GLint sprite_screen_loc; ///< Uniform location for screen size;
GLint sprite_zoom_loc; ///< Uniform location for sprite zoom;
GLint sprite_rgb_loc; ///< Uniform location for RGB mode flag;
GLint sprite_crash_loc; ///< Uniform location for crash remap mode flag;
LRUCache<SpriteID, Sprite> cursor_cache; ///< Cache of encoded cursor sprites.
PaletteID last_sprite_pal = (PaletteID)-1; ///< Last uploaded remap palette.
bool clear_cursor_cache = false; ///< A clear of the cursor cache is pending.
Point cursor_pos; ///< Cursor position
bool cursor_in_window; ///< Cursor inside this window
PalSpriteID cursor_sprite_seq[16]; ///< Current image of cursor
Point cursor_sprite_pos[16]; ///< Relative position of individual cursor sprites
uint cursor_sprite_count; ///< Number of cursor sprites to draw
OpenGLBackend();
~OpenGLBackend();
const char *Init(const Dimension &screen_res);
bool InitShaders();
void InternalClearCursorCache();
void RenderOglSprite(OpenGLSprite *gl_sprite, PaletteID pal, int x, int y, ZoomLevel zoom);
public:
/** Get singleton instance of this class. */
static inline OpenGLBackend *Get()
{
return OpenGLBackend::instance;
}
static const char *Create(GetOGLProcAddressProc get_proc, const Dimension &screen_res);
static void Destroy();
void PrepareContext();
void UpdatePalette(const Colour *pal, uint first, uint length);
bool Resize(int w, int h, bool force = false);
void Paint();
void DrawMouseCursor();
void PopulateCursorCache();
void ClearCursorCache();
void *GetVideoBuffer();
uint8 *GetAnimBuffer();
void ReleaseVideoBuffer(const Rect &update_rect);
void ReleaseAnimBuffer(const Rect &update_rect);
/* SpriteEncoder */
bool Is32BppSupported() override { return true; }
uint GetSpriteAlignment() override { return 1u << (ZOOM_LVL_COUNT - 1); }
Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
};
/** Class that encapsulates a RGBA texture together with a paletted remap texture. */
class OpenGLSprite {
private:
/** Enum of all used OpenGL texture objects. */
enum Texture {
TEX_RGBA, ///< RGBA texture part.
TEX_REMAP, ///< Remap texture part.
NUM_TEX
};
Dimension dim;
GLuint tex[NUM_TEX]; ///< The texture objects.
static GLuint dummy_tex[NUM_TEX]; ///< 1x1 dummy textures to substitute for unused sprite components.
static GLuint pal_identity; ///< Identity texture mapping.
static GLuint pal_tex; ///< Texture for palette remap.
static GLuint pal_pbo; ///< Pixel buffer object for remap upload.
static bool Create();
static void Destroy();
bool BindTextures();
public:
OpenGLSprite(uint width, uint height, uint levels, SpriteColourComponent components);
~OpenGLSprite();
void Update(uint width, uint height, uint level, const SpriteLoader::CommonPixel *data);
Dimension GetSize(ZoomLevel level) const;
friend class OpenGLBackend;
};
#endif /* VIDEO_OPENGL_H */
|
