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1 /*
2  * Copyright (C) 2010 Maciej Cencora <m.cencora@gmail.com>
3  *
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining
7  * a copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sublicense, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial
16  * portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  */
27 
28 #include "stdint.h"
29 #include "main/bufferobj.h"
30 #include "main/enums.h"
31 #include "main/fbobject.h"
32 #include "main/image.h"
33 #include "main/readpix.h"
34 #include "main/state.h"
35 
36 #include "radeon_common_context.h"
37 #include "radeon_buffer_objects.h"
38 #include "radeon_debug.h"
39 #include "radeon_mipmap_tree.h"
40 
gl_format_and_type_to_mesa_format(GLenum format,GLenum type)41 static mesa_format gl_format_and_type_to_mesa_format(GLenum format, GLenum type)
42 {
43     switch (format)
44     {
45         case GL_RGB:
46             switch (type) {
47                 case GL_UNSIGNED_SHORT_5_6_5:
48                     return MESA_FORMAT_B5G6R5_UNORM;
49                 case GL_UNSIGNED_SHORT_5_6_5_REV:
50                     return MESA_FORMAT_R5G6B5_UNORM;
51             }
52             break;
53         case GL_RGBA:
54             switch (type) {
55                 case GL_FLOAT:
56                     return MESA_FORMAT_RGBA_FLOAT32;
57                 case GL_UNSIGNED_SHORT_5_5_5_1:
58                     return MESA_FORMAT_A1B5G5R5_UNORM;
59                 case GL_UNSIGNED_INT_8_8_8_8:
60                     return MESA_FORMAT_A8B8G8R8_UNORM;
61                 case GL_UNSIGNED_BYTE:
62                 case GL_UNSIGNED_INT_8_8_8_8_REV:
63                     return MESA_FORMAT_R8G8B8A8_UNORM;
64             }
65             break;
66         case GL_BGRA:
67             switch (type) {
68                 case GL_UNSIGNED_SHORT_4_4_4_4:
69                     return MESA_FORMAT_A4R4G4B4_UNORM;
70                 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
71                     return MESA_FORMAT_B4G4R4A4_UNORM;
72                 case GL_UNSIGNED_SHORT_5_5_5_1:
73                     return MESA_FORMAT_A1R5G5B5_UNORM;
74                 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
75                     return MESA_FORMAT_B5G5R5A1_UNORM;
76                 case GL_UNSIGNED_INT_8_8_8_8:
77                     return MESA_FORMAT_A8R8G8B8_UNORM;
78                 case GL_UNSIGNED_BYTE:
79                 case GL_UNSIGNED_INT_8_8_8_8_REV:
80                     return MESA_FORMAT_B8G8R8A8_UNORM;
81 
82             }
83             break;
84     }
85 
86     return MESA_FORMAT_NONE;
87 }
88 
89 static GLboolean
do_blit_readpixels(struct gl_context * ctx,GLint x,GLint y,GLsizei width,GLsizei height,GLenum format,GLenum type,const struct gl_pixelstore_attrib * pack,GLvoid * pixels)90 do_blit_readpixels(struct gl_context * ctx,
91                    GLint x, GLint y, GLsizei width, GLsizei height,
92                    GLenum format, GLenum type,
93                    const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
94 {
95     radeonContextPtr radeon = RADEON_CONTEXT(ctx);
96     const struct radeon_renderbuffer *rrb = radeon_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
97     const mesa_format dst_format = gl_format_and_type_to_mesa_format(format, type);
98     unsigned dst_rowstride, dst_imagesize, aligned_rowstride, flip_y;
99     struct radeon_bo *dst_buffer;
100     GLint dst_x = 0, dst_y = 0;
101     intptr_t dst_offset;
102 
103     /* It's not worth if number of pixels to copy is really small */
104     if (width * height < 100) {
105         return GL_FALSE;
106     }
107 
108     if (dst_format == MESA_FORMAT_NONE ||
109         !radeon->vtbl.check_blit(dst_format, rrb->pitch / rrb->cpp) || !radeon->vtbl.blit) {
110         return GL_FALSE;
111     }
112 
113     if (ctx->_ImageTransferState || ctx->Color.ColorLogicOpEnabled) {
114         return GL_FALSE;
115     }
116 
117     if (pack->SwapBytes || pack->LsbFirst) {
118         return GL_FALSE;
119     }
120 
121     if (pack->RowLength > 0) {
122         dst_rowstride = pack->RowLength;
123     } else {
124         dst_rowstride = width;
125     }
126 
127     if (!_mesa_clip_copytexsubimage(ctx, &dst_x, &dst_y, &x, &y, &width, &height)) {
128         return GL_TRUE;
129     }
130     assert(x >= 0 && y >= 0);
131 
132     aligned_rowstride = get_texture_image_row_stride(radeon, dst_format, dst_rowstride, 0, GL_TEXTURE_2D);
133     dst_rowstride *= _mesa_get_format_bytes(dst_format);
134     if (pack->BufferObj && aligned_rowstride != dst_rowstride)
135         return GL_FALSE;
136     dst_imagesize = get_texture_image_size(dst_format,
137                                            aligned_rowstride,
138                                            height, 1, 0);
139 
140     if (!pack->BufferObj)
141     {
142         dst_buffer = radeon_bo_open(radeon->radeonScreen->bom, 0, dst_imagesize, 1024, RADEON_GEM_DOMAIN_GTT, 0);
143         dst_offset = 0;
144     }
145     else
146     {
147         dst_buffer = get_radeon_buffer_object(pack->BufferObj)->bo;
148         dst_offset = (intptr_t)pixels;
149     }
150 
151     /* Disable source Y flipping for FBOs */
152     flip_y = _mesa_is_winsys_fbo(ctx->ReadBuffer);
153     if (pack->Invert) {
154         y = rrb->base.Base.Height - height - y;
155         flip_y = !flip_y;
156     }
157 
158     if (radeon->vtbl.blit(ctx,
159                           rrb->bo,
160                           rrb->draw_offset,
161                           rrb->base.Base.Format,
162                           rrb->pitch / rrb->cpp,
163                           rrb->base.Base.Width,
164                           rrb->base.Base.Height,
165                           x,
166                           y,
167                           dst_buffer,
168                           dst_offset,
169                           dst_format,
170                           aligned_rowstride / _mesa_get_format_bytes(dst_format),
171                           width,
172                           height,
173                           0, /* dst_x */
174                           0, /* dst_y */
175                           width,
176                           height,
177                           flip_y))
178     {
179        if (!pack->BufferObj)
180        {
181             radeon_bo_map(dst_buffer, 0);
182             copy_rows(pixels, dst_rowstride, dst_buffer->ptr,
183                       aligned_rowstride, height, dst_rowstride);
184             radeon_bo_unmap(dst_buffer);
185             radeon_bo_unref(dst_buffer);
186         }
187 
188         return GL_TRUE;
189     }
190 
191     if (!pack->BufferObj)
192         radeon_bo_unref(dst_buffer);
193 
194     return GL_FALSE;
195 }
196 
197 void
radeonReadPixels(struct gl_context * ctx,GLint x,GLint y,GLsizei width,GLsizei height,GLenum format,GLenum type,const struct gl_pixelstore_attrib * pack,GLvoid * pixels)198 radeonReadPixels(struct gl_context * ctx,
199                  GLint x, GLint y, GLsizei width, GLsizei height,
200                  GLenum format, GLenum type,
201                  const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
202 {
203     radeonContextPtr radeon = RADEON_CONTEXT(ctx);
204     radeon_prepare_render(radeon);
205 
206     if (do_blit_readpixels(ctx, x, y, width, height, format, type, pack, pixels))
207         return;
208 
209     /* Update Mesa state before calling _mesa_readpixels().
210      * XXX this may not be needed since ReadPixels no longer uses the
211      * span code.
212      */
213     radeon_print(RADEON_FALLBACKS, RADEON_NORMAL,
214                  "Falling back to sw for ReadPixels (format %s, type %s)\n",
215                  _mesa_enum_to_string(format), _mesa_enum_to_string(type));
216 
217     if (ctx->NewState)
218         _mesa_update_state(ctx);
219 
220     _mesa_readpixels(ctx, x, y, width, height, format, type, pack, pixels);
221 }
222