intel_tex_format.c revision 18a6e5ee73c5cef283c6bef906e5f8e4f60d4000 
1#include "intel_context.h"
2#include "intel_tex.h"
3#include "main/enums.h"
4#include "main/formats.h"
5
6/**
7 * Choose hardware texture format given the user's glTexImage parameters.
8 *
9 * It works out that this function is fine for all the supported
10 * hardware.  However, there is still a need to map the formats onto
11 * hardware descriptors.
12 *
13 * Note that the i915 can actually support many more formats than
14 * these if we take the step of simply swizzling the colors
15 * immediately after sampling...
16 */
17gl_format
18intelChooseTextureFormat(GLcontext * ctx, GLint internalFormat,
19                         GLenum format, GLenum type)
20{
21   struct intel_context *intel = intel_context(ctx);
22   const GLboolean do32bpt = (intel->ctx.Visual.rgbBits >= 24);
23
24#if 0
25   printf("%s intFmt=0x%x format=0x%x type=0x%x\n",
26          __FUNCTION__, internalFormat, format, type);
27#endif
28
29   switch (internalFormat) {
30   case 4:
31   case GL_RGBA:
32   case GL_COMPRESSED_RGBA:
33      if (format == GL_BGRA) {
34         if (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) {
35            return MESA_FORMAT_ARGB8888;
36         }
37         else if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
38            return MESA_FORMAT_ARGB4444;
39         }
40         else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
41            return MESA_FORMAT_ARGB1555;
42         }
43      }
44      return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_ARGB4444;
45
46   case 3:
47   case GL_RGB:
48   case GL_COMPRESSED_RGB:
49      if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
50         return MESA_FORMAT_RGB565;
51      }
52      return do32bpt ? MESA_FORMAT_XRGB8888 : MESA_FORMAT_RGB565;
53
54   case GL_RGBA8:
55   case GL_RGB10_A2:
56   case GL_RGBA12:
57   case GL_RGBA16:
58      return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_ARGB4444;
59
60   case GL_RGBA4:
61   case GL_RGBA2:
62      return MESA_FORMAT_ARGB4444;
63
64   case GL_RGB5_A1:
65      return MESA_FORMAT_ARGB1555;
66
67   case GL_RGB8:
68   case GL_RGB10:
69   case GL_RGB12:
70   case GL_RGB16:
71      return MESA_FORMAT_XRGB8888;
72
73   case GL_RGB5:
74   case GL_RGB4:
75   case GL_R3_G3_B2:
76      return MESA_FORMAT_RGB565;
77
78   case GL_ALPHA:
79   case GL_ALPHA4:
80   case GL_ALPHA8:
81   case GL_ALPHA12:
82   case GL_ALPHA16:
83   case GL_COMPRESSED_ALPHA:
84      return MESA_FORMAT_A8;
85
86   case 1:
87   case GL_LUMINANCE:
88   case GL_LUMINANCE4:
89   case GL_LUMINANCE8:
90   case GL_LUMINANCE12:
91   case GL_LUMINANCE16:
92   case GL_COMPRESSED_LUMINANCE:
93      return MESA_FORMAT_L8;
94
95   case GL_LUMINANCE12_ALPHA4:
96   case GL_LUMINANCE12_ALPHA12:
97   case GL_LUMINANCE16_ALPHA16:
98#ifndef I915
99      return MESA_FORMAT_AL1616;
100#else
101      /* FALLTHROUGH */
102#endif
103
104   case 2:
105   case GL_LUMINANCE_ALPHA:
106   case GL_LUMINANCE4_ALPHA4:
107   case GL_LUMINANCE6_ALPHA2:
108   case GL_LUMINANCE8_ALPHA8:
109   case GL_COMPRESSED_LUMINANCE_ALPHA:
110      return MESA_FORMAT_AL88;
111
112   case GL_INTENSITY:
113   case GL_INTENSITY4:
114   case GL_INTENSITY8:
115   case GL_INTENSITY12:
116   case GL_INTENSITY16:
117   case GL_COMPRESSED_INTENSITY:
118      return MESA_FORMAT_I8;
119
120   case GL_YCBCR_MESA:
121      if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE)
122         return MESA_FORMAT_YCBCR;
123      else
124         return MESA_FORMAT_YCBCR_REV;
125
126   case GL_COMPRESSED_RGB_FXT1_3DFX:
127      return MESA_FORMAT_RGB_FXT1;
128   case GL_COMPRESSED_RGBA_FXT1_3DFX:
129      return MESA_FORMAT_RGBA_FXT1;
130
131   case GL_RGB_S3TC:
132   case GL_RGB4_S3TC:
133   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
134      return MESA_FORMAT_RGB_DXT1;
135
136   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
137      return MESA_FORMAT_RGBA_DXT1;
138
139   case GL_RGBA_S3TC:
140   case GL_RGBA4_S3TC:
141   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
142      return MESA_FORMAT_RGBA_DXT3;
143
144   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
145      return MESA_FORMAT_RGBA_DXT5;
146
147   case GL_DEPTH_COMPONENT:
148   case GL_DEPTH_COMPONENT16:
149   case GL_DEPTH_COMPONENT24:
150   case GL_DEPTH_COMPONENT32:
151#if 0
152      return MESA_FORMAT_Z16;
153#else
154      /* fall-through.
155       * 16bpp depth texture can't be paired with a stencil buffer so
156       * always used combined depth/stencil format.
157       */
158#endif
159   case GL_DEPTH_STENCIL_EXT:
160   case GL_DEPTH24_STENCIL8_EXT:
161      return MESA_FORMAT_S8_Z24;
162
163#ifndef I915
164   case GL_SRGB_EXT:
165   case GL_SRGB8_EXT:
166   case GL_SRGB_ALPHA_EXT:
167   case GL_SRGB8_ALPHA8_EXT:
168   case GL_COMPRESSED_SRGB_EXT:
169   case GL_COMPRESSED_SRGB_ALPHA_EXT:
170   case GL_COMPRESSED_SLUMINANCE_EXT:
171   case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
172      return MESA_FORMAT_SARGB8;
173   case GL_SLUMINANCE_EXT:
174   case GL_SLUMINANCE8_EXT:
175      if (intel->has_luminance_srgb)
176         return MESA_FORMAT_SL8;
177      else
178         return MESA_FORMAT_SARGB8;
179   case GL_SLUMINANCE_ALPHA_EXT:
180   case GL_SLUMINANCE8_ALPHA8_EXT:
181      if (intel->has_luminance_srgb)
182         return MESA_FORMAT_SLA8;
183      else
184         return MESA_FORMAT_SARGB8;
185   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
186   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
187   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
188   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
189      return MESA_FORMAT_SRGB_DXT1;
190
191   /* i915 could also do this */
192   case GL_DUDV_ATI:
193   case GL_DU8DV8_ATI:
194      return MESA_FORMAT_DUDV8;
195   case GL_RGBA_SNORM:
196   case GL_RGBA8_SNORM:
197      return MESA_FORMAT_SIGNED_RGBA8888_REV;
198#endif
199
200   default:
201      fprintf(stderr, "unexpected texture format %s in %s\n",
202              _mesa_lookup_enum_by_nr(internalFormat), __FUNCTION__);
203      return MESA_FORMAT_NONE;
204   }
205
206   return MESA_FORMAT_NONE;       /* never get here */
207}
208
209int intel_compressed_num_bytes(GLuint mesaFormat)
210{
211   GLuint bw, bh;
212   GLuint block_size;
213
214   block_size = _mesa_get_format_bytes(mesaFormat);
215   _mesa_get_format_block_size(mesaFormat, &bw, &bh);
216
217   return block_size / bw;
218}
219