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_buffer_objects.h"
37#include "radeon_common_context.h"
38#include "radeon_debug.h"
39#include "radeon_mipmap_tree.h"
40
41static gl_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_RGB565;
49                case GL_UNSIGNED_SHORT_5_6_5_REV:
50                    return MESA_FORMAT_RGB565_REV;
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_RGBA5551;
59                case GL_UNSIGNED_INT_8_8_8_8:
60                    return MESA_FORMAT_RGBA8888;
61                case GL_UNSIGNED_BYTE:
62                case GL_UNSIGNED_INT_8_8_8_8_REV:
63                    return MESA_FORMAT_RGBA8888_REV;
64            }
65            break;
66        case GL_BGRA:
67            switch (type) {
68                case GL_UNSIGNED_SHORT_4_4_4_4:
69                    return MESA_FORMAT_ARGB4444_REV;
70                case GL_UNSIGNED_SHORT_4_4_4_4_REV:
71                    return MESA_FORMAT_ARGB4444;
72                case GL_UNSIGNED_SHORT_5_5_5_1:
73                    return MESA_FORMAT_ARGB1555_REV;
74                case GL_UNSIGNED_SHORT_1_5_5_5_REV:
75                    return MESA_FORMAT_ARGB1555;
76                case GL_UNSIGNED_INT_8_8_8_8:
77                    return MESA_FORMAT_ARGB8888_REV;
78                case GL_UNSIGNED_BYTE:
79                case GL_UNSIGNED_INT_8_8_8_8_REV:
80                    return MESA_FORMAT_ARGB8888;
81
82            }
83            break;
84    }
85
86    return MESA_FORMAT_NONE;
87}
88
89static GLboolean
90do_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 gl_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 (_mesa_is_bufferobj(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 (!_mesa_is_bufferobj(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 (!_mesa_is_bufferobj(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 (!_mesa_is_bufferobj(pack->BufferObj))
192        radeon_bo_unref(dst_buffer);
193
194    return GL_FALSE;
195}
196
197void
198radeonReadPixels(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_lookup_enum_by_nr(format), _mesa_lookup_enum_by_nr(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