src/mesa/drivers/dri/radeon/radeon_pixel_read.c

   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/image.h"
  32 #include "main/state.h"
  33 #include "swrast/swrast.h"
  34
  35 #include "radeon_common_context.h"
  36 #include "radeon_debug.h"
  37 #include "radeon_mipmap_tree.h"
  38
  39 static gl_format gl_format_and_type_to_mesa_format(GLenum format, GLenum type)
  40 {
  41     switch (format)
  42     {
  43         case GL_RGB:
  44             switch (type) {
  45                 case GL_UNSIGNED_SHORT_5_6_5:
  46                     return MESA_FORMAT_RGB565;
  47                 case GL_UNSIGNED_SHORT_5_6_5_REV:
  48                     return MESA_FORMAT_RGB565_REV;
  49             }
  50             break;
  51         case GL_RGBA:
  52             switch (type) {
  53                 case GL_UNSIGNED_BYTE:
  54                     return MESA_FORMAT_RGBA8888_REV;
  55                 case GL_FLOAT:
  56                     return MESA_FORMAT_RGBA_FLOAT32;
  57                 case GL_UNSIGNED_SHORT_4_4_4_4:
  58                     return MESA_FORMAT_ARGB4444;
  59                 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
  60                     return MESA_FORMAT_ARGB4444;
  61                 case GL_UNSIGNED_SHORT_5_5_5_1:
  62                     return MESA_FORMAT_RGBA5551;
  63                 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
  64                     return MESA_FORMAT_ARGB1555_REV;
  65                 case GL_UNSIGNED_INT_8_8_8_8:
  66                     return MESA_FORMAT_ARGB8888;
  67                 case GL_UNSIGNED_INT_8_8_8_8_REV:
  68                     return MESA_FORMAT_ARGB8888_REV;
  69             }
  70             break;
  71     }
  72
  73     return MESA_FORMAT_NONE;
  74 }
  75
  76 static GLboolean
  77 do_blit_readpixels(GLcontext * ctx,
  78                    GLint x, GLint y, GLsizei width, GLsizei height,
  79                    GLenum format, GLenum type,
  80                    const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
  81 {
  82     radeonContextPtr radeon = RADEON_CONTEXT(ctx);
  83     const struct radeon_renderbuffer *rrb = radeon_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
  84     const gl_format dst_format = gl_format_and_type_to_mesa_format(format, type);
  85     unsigned dst_rowstride, dst_imagesize, aligned_rowstride, flip_y;
  86     struct radeon_bo *dst_buffer;
  87     GLint dst_x = 0, dst_y = 0;
  88
  89     /* It's not worth if number of pixels to copy is really small */
  90     if (width * height < 100) {
  91         return GL_FALSE;
  92     }
  93
  94     if (dst_format == MESA_FORMAT_NONE ||
  95         !radeon->vtbl.check_blit(dst_format) || !radeon->vtbl.blit) {
  96         return GL_FALSE;
  97     }
  98
  99     if (ctx->_ImageTransferState) {
 100         return GL_FALSE;
 101     }
 102
 103     if (pack->SwapBytes || pack->LsbFirst) {
 104         return GL_FALSE;
 105     }
 106
 107     if (pack->RowLength > 0) {
 108         dst_rowstride = pack->RowLength;
 109     } else {
 110         dst_rowstride = width;
 111     }
 112
 113     if (!_mesa_clip_copytexsubimage(ctx, &dst_x, &dst_y, &x, &y, &width, &height)) {
 114         return GL_TRUE;
 115     }
 116     assert(x >= 0 && y >= 0);
 117
 118     aligned_rowstride = get_texture_image_row_stride(radeon, dst_format, dst_rowstride, 0);
 119     dst_imagesize = get_texture_image_size(dst_format,
 120                                            aligned_rowstride,
 121                                            height, 1, 0);
 122     dst_buffer = radeon_bo_open(radeon->radeonScreen->bom, 0, dst_imagesize, 1024, RADEON_GEM_DOMAIN_GTT, 0);
 123
 124     /* Disable source Y flipping for FBOs */
 125     flip_y = (ctx->ReadBuffer->Name == 0);
 126     if (pack->Invert) {
 127         y = rrb->base.Height - height - y;
 128         flip_y = !flip_y;
 129     }
 130
 131     if (radeon->vtbl.blit(ctx,
 132                           rrb->bo,
 133                           rrb->draw_offset,
 134                           rrb->base.Format,
 135                           rrb->pitch / rrb->cpp,
 136                           rrb->base.Width,
 137                           rrb->base.Height,
 138                           x,
 139                           y,
 140                           dst_buffer,
 141                           0, /* dst_offset */
 142                           dst_format,
 143                           aligned_rowstride / _mesa_get_format_bytes(dst_format),
 144                           width,
 145                           height,
 146                           0, /* dst_x */
 147                           0, /* dst_y */
 148                           width,
 149                           height,
 150                           flip_y))
 151     {
 152         radeon_bo_map(dst_buffer, 0);
 153         dst_rowstride *= _mesa_get_format_bytes(dst_format);
 154         copy_rows(pixels, dst_rowstride, dst_buffer->ptr,
 155                   aligned_rowstride, height, dst_rowstride);
 156         radeon_bo_unmap(dst_buffer);
 157         radeon_bo_unref(dst_buffer);
 158         return GL_TRUE;
 159     } else {
 160         radeon_bo_unref(dst_buffer);
 161         return GL_FALSE;
 162     }
 163 }
 164
 165 void
 166 radeonReadPixels(GLcontext * ctx,
 167                  GLint x, GLint y, GLsizei width, GLsizei height,
 168                  GLenum format, GLenum type,
 169                  const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
 170 {
 171     if (do_blit_readpixels(ctx, x, y, width, height, format, type, pack, pixels))
 172         return;
 173
 174     /* Update Mesa state before calling down into _swrast_ReadPixels, as
 175      * the spans code requires the computed buffer states to be up to date,
 176      * but _swrast_ReadPixels only updates Mesa state after setting up
 177      * the spans code.
 178      */
 179
 180     radeon_print(RADEON_FALLBACKS, RADEON_NORMAL,
 181                  "Falling back to sw for ReadPixels (format %s, type %s)\n",
 182                  _mesa_lookup_enum_by_nr(format), _mesa_lookup_enum_by_nr(type));
 183
 184     if (ctx->NewState)
 185         _mesa_update_state(ctx);
 186
 187     _swrast_ReadPixels(ctx, x, y, width, height, format, type, pack, pixels);
 188 }