1 #include <msp/gl/extensions/arb_texture_float.h>
2 #include <msp/gl/extensions/ext_bgra.h>
3 #include <msp/strings/format.h>
4 #include "pixelformat.h"
11 void operator>>(const LexicalConverter &conv, PixelFormat &fmt)
13 if(conv.get()=="STENCIL_INDEX")
15 else if(conv.get()=="DEPTH_COMPONENT")
16 fmt = DEPTH_COMPONENT;
17 else if(conv.get()=="RED")
19 else if(conv.get()=="RG")
21 else if(conv.get()=="RGB")
23 else if(conv.get()=="RGBA")
25 else if(conv.get()=="BGR")
27 else if(conv.get()=="BGRA")
29 else if(conv.get()=="SRGB")
31 else if(conv.get()=="SRGB_ALPHA")
33 else if(conv.get()=="LUMINANCE")
35 else if(conv.get()=="LUMINANCE_ALPHA")
36 fmt = LUMINANCE_ALPHA;
38 throw lexical_error(format("conversion of '%s' to PixelFormat", conv.get()));
41 PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
45 case Graphics::LUMINANCE: return LUMINANCE;
46 case Graphics::LUMINANCE_ALPHA: return LUMINANCE_ALPHA;
47 case Graphics::RGB: return RGB;
49 case Graphics::RGBA: return RGBA;
50 case Graphics::BGR: return BGR;
52 case Graphics::BGRA: return BGRA;
53 default: throw invalid_argument("pixelformat_from_graphics");
57 PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf, bool srgb)
64 case Graphics::BGRX: result = RGB; break;
65 case Graphics::BGRA: result = RGBA; break;
66 default: result = pixelformat_from_graphics(pf);
70 return get_srgb_pixelformat(result);
75 PixelFormat get_base_pixelformat(PixelFormat pf)
77 PixelFormat unsized = get_unsized_pixelformat(pf);
80 case SRGB: return RGB;
81 case SRGB_ALPHA: return RGBA;
82 default: return unsized;
86 PixelFormat get_unsized_pixelformat(PixelFormat pf)
92 case R32F: return RED;
95 case RG32F: return RG;
98 case RGB32F: return RGB;
99 case SRGB8: return SRGB;
102 case RGBA32F: return RGBA;
103 case SRGB8_ALPHA8: return SRGB_ALPHA;
104 case DEPTH_COMPONENT16:
105 case DEPTH_COMPONENT24:
106 case DEPTH_COMPONENT32:
107 case DEPTH_COMPONENT32F: return DEPTH_COMPONENT;
112 PixelFormat get_sized_pixelformat(PixelFormat pf, unsigned size)
115 throw invalid_argument("get_sized_pixelformat");
117 pf = get_unsized_pixelformat(pf);
126 case RGB: return RGB8;
127 case RGBA: return RGBA8;
128 case SRGB: return SRGB8;
129 case SRGB_ALPHA: return SRGB8_ALPHA8;
130 default: throw invalid_argument("get_sized_pixelformat");
135 case RED: return R16F;
136 case RG: return RG16F;
137 case RGB: return RGB16F;
138 case RGBA: return RGBA16F;
139 case DEPTH_COMPONENT: return DEPTH_COMPONENT16;
140 default: throw invalid_argument("get_sized_pixelformat");
143 if(pf==DEPTH_COMPONENT)
144 return DEPTH_COMPONENT24;
146 throw invalid_argument("get_sized_pixelformat");
150 case RED: return R32F;
151 case RG: return RG32F;
152 case RGB: return RGB32F;
153 case RGBA: return RGBA32F;
154 case DEPTH_COMPONENT: return ARB_depth_buffer_float ? DEPTH_COMPONENT32F : DEPTH_COMPONENT32;
155 default: throw invalid_argument("get_sized_pixelformat");
158 throw invalid_argument("get_sized_pixelformat");
162 PixelFormat get_default_sized_pixelformat(PixelFormat pf)
164 pf = get_unsized_pixelformat(pf);
166 if(pf==DEPTH_COMPONENT)
168 if(get_gl_api()==OPENGL_ES2 && !ARB_depth_buffer_float)
173 return get_sized_pixelformat(pf, size);
176 PixelFormat get_srgb_pixelformat(PixelFormat pf)
180 case RGB: return SRGB;
181 case RGBA: return SRGB_ALPHA;
182 case RGB8: return SRGB8;
183 case RGBA8: return SRGB8_ALPHA8;
188 unsigned get_component_count(PixelFormat pf)
190 switch(get_base_pixelformat(pf))
193 case DEPTH_COMPONENT:
198 case LUMINANCE_ALPHA:
207 throw invalid_argument("get_component_count");
211 unsigned get_component_size(PixelFormat pf)
226 case DEPTH_COMPONENT16:
228 case DEPTH_COMPONENT24:
234 case DEPTH_COMPONENT32:
235 case DEPTH_COMPONENT32F:
242 unsigned get_pixel_size(PixelFormat pf)
244 return get_component_count(pf)*max(get_component_size(pf), 1U);
247 void require_pixelformat(PixelFormat pf)
249 /* TODO These checks are only accurate for textures. On OpenGL ES some
250 formats are allowed for render buffers earlier than textures. In particular
251 it's possible to create a 16-bit depth renderbuffer on OpenGL ES 2.0 but
252 depth textures are only available with 3.0 or the OES_depth_texture
258 { static Require _req(OES_required_internalformat); }
264 { static Require _req(ARB_texture_rg); }
270 { static Require _req(ARB_texture_rg); }
271 { static Require _req(ARB_texture_float); }
277 { static Require _req(ARB_texture_float); }
283 { static Require _req(EXT_texture_sRGB); }
287 { static Require _req(EXT_bgra); }
289 case DEPTH_COMPONENT:
290 { static Require _req(ARB_depth_texture); }
292 case DEPTH_COMPONENT16:
293 case DEPTH_COMPONENT24:
294 case DEPTH_COMPONENT32:
295 { static Require _req(ARB_depth_texture); }
296 { static Require _req(OES_required_internalformat); }
298 case DEPTH_COMPONENT32F:
299 { static Require _req(ARB_depth_buffer_float); }
302 { static Require _req(OES_texture_stencil8); }