2 * Mesa 3-D graphics library
4 * Copyright (C) 2014 Intel Corporation. All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
25 * Jason Ekstrand <jason.ekstrand@intel.com>
32 #include "copyimage.h"
36 #include "textureview.h"
37 #include "glformats.h"
39 enum mesa_block_class
{
45 * Prepare the source or destination resource. This involves error
46 * checking and returning the relevant gl_texture_image or gl_renderbuffer.
47 * Note that one of the resulting tex_image or renderbuffer pointers will be
48 * NULL and the other will be non-null.
50 * \param name the texture or renderbuffer name
51 * \param target One of GL_TEXTURE_x target or GL_RENDERBUFFER
52 * \param level mipmap level
53 * \param z src or dest Z
54 * \param depth number of slices/faces/layers to copy
55 * \param tex_image returns a pointer to a texture image
56 * \param renderbuffer returns a pointer to a renderbuffer
57 * \return true if success, false if error
60 prepare_target_err(struct gl_context
*ctx
, GLuint name
, GLenum target
,
61 int level
, int z
, int depth
,
62 struct gl_texture_image
**tex_image
,
63 struct gl_renderbuffer
**renderbuffer
,
65 GLenum
*internalFormat
,
69 const char *dbg_prefix
)
72 _mesa_error(ctx
, GL_INVALID_VALUE
,
73 "glCopyImageSubData(%sName = %d)", dbg_prefix
, name
);
78 * INVALID_ENUM is generated
79 * * if either <srcTarget> or <dstTarget>
80 * - is not RENDERBUFFER or a valid non-proxy texture target
81 * - is TEXTURE_BUFFER, or
82 * - is one of the cubemap face selectors described in table 3.17,
86 /* Not a texture target, but valid */
88 case GL_TEXTURE_1D_ARRAY
:
91 case GL_TEXTURE_CUBE_MAP
:
92 case GL_TEXTURE_RECTANGLE
:
93 case GL_TEXTURE_2D_ARRAY
:
94 case GL_TEXTURE_CUBE_MAP_ARRAY
:
95 case GL_TEXTURE_2D_MULTISAMPLE
:
96 case GL_TEXTURE_2D_MULTISAMPLE_ARRAY
:
97 /* These are all valid */
99 case GL_TEXTURE_EXTERNAL_OES
:
100 /* Only exists in ES */
101 case GL_TEXTURE_BUFFER
:
103 _mesa_error(ctx
, GL_INVALID_ENUM
,
104 "glCopyImageSubData(%sTarget = %s)", dbg_prefix
,
105 _mesa_enum_to_string(target
));
109 if (target
== GL_RENDERBUFFER
) {
110 struct gl_renderbuffer
*rb
= _mesa_lookup_renderbuffer(ctx
, name
);
113 _mesa_error(ctx
, GL_INVALID_VALUE
,
114 "glCopyImageSubData(%sName = %u)", dbg_prefix
, name
);
119 _mesa_error(ctx
, GL_INVALID_OPERATION
,
120 "glCopyImageSubData(%sName incomplete)", dbg_prefix
);
125 _mesa_error(ctx
, GL_INVALID_VALUE
,
126 "glCopyImageSubData(%sLevel = %u)", dbg_prefix
, level
);
131 *format
= rb
->Format
;
132 *internalFormat
= rb
->InternalFormat
;
134 *height
= rb
->Height
;
135 *num_samples
= rb
->NumSamples
;
138 struct gl_texture_object
*texObj
= _mesa_lookup_texture(ctx
, name
);
142 * From GL_ARB_copy_image specification:
143 * "INVALID_VALUE is generated if either <srcName> or <dstName> does
144 * not correspond to a valid renderbuffer or texture object according
145 * to the corresponding target parameter."
147 _mesa_error(ctx
, GL_INVALID_VALUE
,
148 "glCopyImageSubData(%sName = %u)", dbg_prefix
, name
);
152 /* The ARB_copy_image specification says:
154 * "INVALID_OPERATION is generated if either object is a texture and
155 * the texture is not complete (as defined in section 3.9.14)"
157 * The cited section says:
159 * "Using the preceding definitions, a texture is complete unless any
160 * of the following conditions hold true: [...]
162 * * The minification filter requires a mipmap (is neither NEAREST
163 * nor LINEAR), and the texture is not mipmap complete."
165 * This imposes the bizarre restriction that glCopyImageSubData requires
166 * mipmap completion based on the sampler minification filter, even
167 * though the call fundamentally ignores the sampler. Additionally, it
168 * doesn't work with texture units, so it can't consider any bound
169 * separate sampler objects. It appears that you're supposed to use
170 * the sampler object which is built-in to the texture object.
172 * dEQP and the Android CTS mandate this behavior, and the Khronos
173 * GL and ES working groups both affirmed that this is unfortunate but
174 * correct. See https://cvs.khronos.org/bugzilla/show_bug.cgi?id=16224.
176 * Integer textures with filtering cause another completeness snag:
179 * – The internal format of the texture is integer (see table 8.12).
180 * – The internal format is STENCIL_INDEX.
181 * – The internal format is DEPTH_STENCIL, and the value of
182 * DEPTH_STENCIL_TEXTURE_MODE for the texture is STENCIL_INDEX.
183 * and either the magnification filter is not NEAREST, or the
184 * minification filter is neither NEAREST nor
185 * NEAREST_MIPMAP_NEAREST."
187 * However, applications in the wild (such as "Total War: WARHAMMER")
188 * appear to call glCopyImageSubData with integer textures and the
189 * default mipmap filters of GL_LINEAR and GL_NEAREST_MIPMAP_LINEAR,
190 * which would be considered incomplete, but expect this to work. In
191 * fact, until VK-GL-CTS commit fef80039ff875a51806b54d151c5f2d0c12da,
192 * the GL 4.5 CTS contained three tests which did the exact same thing
193 * by accident, and all conformant implementations allowed it.
195 * A proposal was made to amend the spec to say "is not complete (as
196 * defined in section <X>, but ignoring format-based completeness
197 * rules)" to allow this case. It makes some sense, given that
198 * glCopyImageSubData copies raw data without considering format.
199 * While the official edits have not yet been made, the OpenGL
200 * working group agreed with the idea of allowing this behavior.
202 * To ignore formats, we check texObj->_MipmapComplete directly
203 * rather than calling _mesa_is_texture_complete().
205 _mesa_test_texobj_completeness(ctx
, texObj
);
206 const bool texture_complete_aside_from_formats
=
207 _mesa_is_mipmap_filter(&texObj
->Sampler
) ? texObj
->_MipmapComplete
208 : texObj
->_BaseComplete
;
209 if (!texture_complete_aside_from_formats
) {
210 _mesa_error(ctx
, GL_INVALID_OPERATION
,
211 "glCopyImageSubData(%sName incomplete)", dbg_prefix
);
215 /* Note that target will not be a cube face name */
216 if (texObj
->Target
!= target
) {
218 * From GL_ARB_copy_image_specification:
219 * "INVALID_ENUM is generated if the target does not match the type
222 _mesa_error(ctx
, GL_INVALID_ENUM
,
223 "glCopyImageSubData(%sTarget = %s)", dbg_prefix
,
224 _mesa_enum_to_string(target
));
228 if (level
< 0 || level
>= MAX_TEXTURE_LEVELS
) {
229 _mesa_error(ctx
, GL_INVALID_VALUE
,
230 "glCopyImageSubData(%sLevel = %d)", dbg_prefix
, level
);
234 if (target
== GL_TEXTURE_CUBE_MAP
) {
237 assert(z
< MAX_FACES
); /* should have been caught earlier */
239 /* make sure all the cube faces are present */
240 for (i
= 0; i
< depth
; i
++) {
241 if (!texObj
->Image
[z
+i
][level
]) {
242 /* missing cube face */
243 _mesa_error(ctx
, GL_INVALID_VALUE
,
244 "glCopyImageSubData(missing cube face)");
249 *tex_image
= texObj
->Image
[z
][level
];
252 *tex_image
= _mesa_select_tex_image(texObj
, target
, level
);
256 _mesa_error(ctx
, GL_INVALID_VALUE
,
257 "glCopyImageSubData(%sLevel = %u)", dbg_prefix
, level
);
261 *renderbuffer
= NULL
;
262 *format
= (*tex_image
)->TexFormat
;
263 *internalFormat
= (*tex_image
)->InternalFormat
;
264 *width
= (*tex_image
)->Width
;
265 *height
= (*tex_image
)->Height
;
266 *num_samples
= (*tex_image
)->NumSamples
;
273 prepare_target(struct gl_context
*ctx
, GLuint name
, GLenum target
,
275 struct gl_texture_image
**texImage
,
276 struct gl_renderbuffer
**renderbuffer
)
278 if (target
== GL_RENDERBUFFER
) {
279 struct gl_renderbuffer
*rb
= _mesa_lookup_renderbuffer(ctx
, name
);
284 struct gl_texture_object
*texObj
= _mesa_lookup_texture(ctx
, name
);
286 if (target
== GL_TEXTURE_CUBE_MAP
) {
287 *texImage
= texObj
->Image
[z
][level
];
290 *texImage
= _mesa_select_tex_image(texObj
, target
, level
);
293 *renderbuffer
= NULL
;
298 * Check that the x,y,z,width,height,region is within the texture image
300 * \return true if bounds OK, false if regions is out of bounds
303 check_region_bounds(struct gl_context
*ctx
,
305 const struct gl_texture_image
*tex_image
,
306 const struct gl_renderbuffer
*renderbuffer
,
307 int x
, int y
, int z
, int width
, int height
, int depth
,
308 const char *dbg_prefix
)
310 int surfWidth
, surfHeight
, surfDepth
;
312 if (width
< 0 || height
< 0 || depth
< 0) {
313 _mesa_error(ctx
, GL_INVALID_VALUE
,
314 "glCopyImageSubData(%sWidth, %sHeight, or %sDepth is negative)",
315 dbg_prefix
, dbg_prefix
, dbg_prefix
);
319 if (x
< 0 || y
< 0 || z
< 0) {
320 _mesa_error(ctx
, GL_INVALID_VALUE
,
321 "glCopyImageSubData(%sX, %sY, or %sZ is negative)",
322 dbg_prefix
, dbg_prefix
, dbg_prefix
);
326 /* Check X direction */
327 if (target
== GL_RENDERBUFFER
) {
328 surfWidth
= renderbuffer
->Width
;
331 surfWidth
= tex_image
->Width
;
334 if (x
+ width
> surfWidth
) {
335 _mesa_error(ctx
, GL_INVALID_VALUE
,
336 "glCopyImageSubData(%sX or %sWidth exceeds image bounds)",
337 dbg_prefix
, dbg_prefix
);
341 /* Check Y direction */
343 case GL_RENDERBUFFER
:
344 surfHeight
= renderbuffer
->Height
;
347 case GL_TEXTURE_1D_ARRAY
:
351 surfHeight
= tex_image
->Height
;
354 if (y
+ height
> surfHeight
) {
355 _mesa_error(ctx
, GL_INVALID_VALUE
,
356 "glCopyImageSubData(%sY or %sHeight exceeds image bounds)",
357 dbg_prefix
, dbg_prefix
);
361 /* Check Z direction */
363 case GL_RENDERBUFFER
:
366 case GL_TEXTURE_2D_MULTISAMPLE
:
367 case GL_TEXTURE_RECTANGLE
:
370 case GL_TEXTURE_CUBE_MAP
:
373 case GL_TEXTURE_1D_ARRAY
:
374 surfDepth
= tex_image
->Height
;
377 surfDepth
= tex_image
->Depth
;
380 if (z
< 0 || z
+ depth
> surfDepth
) {
381 _mesa_error(ctx
, GL_INVALID_VALUE
,
382 "glCopyImageSubData(%sZ or %sDepth exceeds image bounds)",
383 dbg_prefix
, dbg_prefix
);
391 compressed_format_compatible(const struct gl_context
*ctx
,
392 GLenum compressedFormat
, GLenum otherFormat
)
394 enum mesa_block_class compressedClass
, otherClass
;
396 /* Two view-incompatible compressed formats are never compatible. */
397 if (_mesa_is_compressed_format(ctx
, otherFormat
)) {
402 * From ARB_copy_image spec:
403 * Table 4.X.1 (Compatible internal formats for copying between
404 * compressed and uncompressed internal formats)
405 * ---------------------------------------------------------------------
406 * | Texel / | Uncompressed | |
407 * | Block | internal format | Compressed internal format |
409 * ---------------------------------------------------------------------
410 * | 128-bit | RGBA32UI, | COMPRESSED_RGBA_S3TC_DXT3_EXT, |
411 * | | RGBA32I, | COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT,|
412 * | | RGBA32F | COMPRESSED_RGBA_S3TC_DXT5_EXT, |
413 * | | | COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT,|
414 * | | | COMPRESSED_RG_RGTC2, |
415 * | | | COMPRESSED_SIGNED_RG_RGTC2, |
416 * | | | COMPRESSED_RGBA_BPTC_UNORM, |
417 * | | | COMPRESSED_SRGB_ALPHA_BPTC_UNORM, |
418 * | | | COMPRESSED_RGB_BPTC_SIGNED_FLOAT, |
419 * | | | COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT |
420 * ---------------------------------------------------------------------
421 * | 64-bit | RGBA16F, RG32F, | COMPRESSED_RGB_S3TC_DXT1_EXT, |
422 * | | RGBA16UI, RG32UI, | COMPRESSED_SRGB_S3TC_DXT1_EXT, |
423 * | | RGBA16I, RG32I, | COMPRESSED_RGBA_S3TC_DXT1_EXT, |
424 * | | RGBA16, | COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT,|
425 * | | RGBA16_SNORM | COMPRESSED_RED_RGTC1, |
426 * | | | COMPRESSED_SIGNED_RED_RGTC1 |
427 * ---------------------------------------------------------------------
430 switch (compressedFormat
) {
431 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
432 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
433 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
434 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
435 case GL_COMPRESSED_RG_RGTC2
:
436 case GL_COMPRESSED_SIGNED_RG_RGTC2
:
437 case GL_COMPRESSED_RGBA_BPTC_UNORM
:
438 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
:
439 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
:
440 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
:
441 compressedClass
= BLOCK_CLASS_128_BITS
;
443 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT
:
444 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
:
445 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
446 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
447 case GL_COMPRESSED_RED_RGTC1
:
448 case GL_COMPRESSED_SIGNED_RED_RGTC1
:
449 compressedClass
= BLOCK_CLASS_64_BITS
;
451 case GL_COMPRESSED_RGBA8_ETC2_EAC
:
452 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
:
453 case GL_COMPRESSED_RG11_EAC
:
454 case GL_COMPRESSED_SIGNED_RG11_EAC
:
455 if (_mesa_is_gles(ctx
))
456 compressedClass
= BLOCK_CLASS_128_BITS
;
460 case GL_COMPRESSED_RGB8_ETC2
:
461 case GL_COMPRESSED_SRGB8_ETC2
:
462 case GL_COMPRESSED_R11_EAC
:
463 case GL_COMPRESSED_SIGNED_R11_EAC
:
464 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
465 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
466 if (_mesa_is_gles(ctx
))
467 compressedClass
= BLOCK_CLASS_64_BITS
;
472 if (_mesa_is_gles(ctx
) && _mesa_is_astc_format(compressedFormat
))
473 compressedClass
= BLOCK_CLASS_128_BITS
;
479 switch (otherFormat
) {
483 otherClass
= BLOCK_CLASS_128_BITS
;
492 case GL_RGBA16_SNORM
:
493 otherClass
= BLOCK_CLASS_64_BITS
;
499 return compressedClass
== otherClass
;
503 copy_format_compatible(const struct gl_context
*ctx
,
504 GLenum srcFormat
, GLenum dstFormat
)
507 * From ARB_copy_image spec:
508 * For the purposes of CopyImageSubData, two internal formats
509 * are considered compatible if any of the following conditions are
511 * * the formats are the same,
512 * * the formats are considered compatible according to the
513 * compatibility rules used for texture views as defined in
514 * section 3.9.X. In particular, if both internal formats are listed
515 * in the same entry of Table 3.X.2, they are considered compatible, or
516 * * one format is compressed and the other is uncompressed and
517 * Table 4.X.1 lists the two formats in the same row.
520 if (_mesa_texture_view_compatible_format(ctx
, srcFormat
, dstFormat
)) {
521 /* Also checks if formats are equal. */
523 } else if (_mesa_is_compressed_format(ctx
, srcFormat
)) {
524 return compressed_format_compatible(ctx
, srcFormat
, dstFormat
);
525 } else if (_mesa_is_compressed_format(ctx
, dstFormat
)) {
526 return compressed_format_compatible(ctx
, dstFormat
, srcFormat
);
533 copy_image_subdata(struct gl_context
*ctx
,
534 struct gl_texture_image
*srcTexImage
,
535 struct gl_renderbuffer
*srcRenderbuffer
,
536 int srcX
, int srcY
, int srcZ
, int srcLevel
,
537 struct gl_texture_image
*dstTexImage
,
538 struct gl_renderbuffer
*dstRenderbuffer
,
539 int dstX
, int dstY
, int dstZ
, int dstLevel
,
540 int srcWidth
, int srcHeight
, int srcDepth
)
542 /* loop over 2D slices/faces/layers */
543 for (int i
= 0; i
< srcDepth
; ++i
) {
544 int newSrcZ
= srcZ
+ i
;
545 int newDstZ
= dstZ
+ i
;
548 srcTexImage
->TexObject
->Target
== GL_TEXTURE_CUBE_MAP
) {
549 /* need to update srcTexImage pointer for the cube face */
550 assert(srcZ
+ i
< MAX_FACES
);
551 srcTexImage
= srcTexImage
->TexObject
->Image
[srcZ
+ i
][srcLevel
];
557 dstTexImage
->TexObject
->Target
== GL_TEXTURE_CUBE_MAP
) {
558 /* need to update dstTexImage pointer for the cube face */
559 assert(dstZ
+ i
< MAX_FACES
);
560 dstTexImage
= dstTexImage
->TexObject
->Image
[dstZ
+ i
][dstLevel
];
565 ctx
->Driver
.CopyImageSubData(ctx
,
566 srcTexImage
, srcRenderbuffer
,
568 dstTexImage
, dstRenderbuffer
,
570 srcWidth
, srcHeight
);
575 _mesa_CopyImageSubData_no_error(GLuint srcName
, GLenum srcTarget
, GLint srcLevel
,
576 GLint srcX
, GLint srcY
, GLint srcZ
,
577 GLuint dstName
, GLenum dstTarget
, GLint dstLevel
,
578 GLint dstX
, GLint dstY
, GLint dstZ
,
579 GLsizei srcWidth
, GLsizei srcHeight
, GLsizei srcDepth
)
581 struct gl_texture_image
*srcTexImage
, *dstTexImage
;
582 struct gl_renderbuffer
*srcRenderbuffer
, *dstRenderbuffer
;
584 GET_CURRENT_CONTEXT(ctx
);
586 prepare_target(ctx
, srcName
, srcTarget
, srcLevel
, srcZ
, &srcTexImage
,
589 prepare_target(ctx
, dstName
, dstTarget
, dstLevel
, dstZ
, &dstTexImage
,
592 copy_image_subdata(ctx
, srcTexImage
, srcRenderbuffer
, srcX
, srcY
, srcZ
,
593 srcLevel
, dstTexImage
, dstRenderbuffer
, dstX
, dstY
, dstZ
,
594 dstLevel
, srcWidth
, srcHeight
, srcDepth
);
598 _mesa_CopyImageSubData(GLuint srcName
, GLenum srcTarget
, GLint srcLevel
,
599 GLint srcX
, GLint srcY
, GLint srcZ
,
600 GLuint dstName
, GLenum dstTarget
, GLint dstLevel
,
601 GLint dstX
, GLint dstY
, GLint dstZ
,
602 GLsizei srcWidth
, GLsizei srcHeight
, GLsizei srcDepth
)
604 GET_CURRENT_CONTEXT(ctx
);
605 struct gl_texture_image
*srcTexImage
, *dstTexImage
;
606 struct gl_renderbuffer
*srcRenderbuffer
, *dstRenderbuffer
;
607 mesa_format srcFormat
, dstFormat
;
608 GLenum srcIntFormat
, dstIntFormat
;
609 GLuint src_w
, src_h
, dst_w
, dst_h
;
610 GLuint src_bw
, src_bh
, dst_bw
, dst_bh
;
611 GLuint src_num_samples
, dst_num_samples
;
612 int dstWidth
, dstHeight
, dstDepth
;
614 if (MESA_VERBOSE
& VERBOSE_API
)
615 _mesa_debug(ctx
, "glCopyImageSubData(%u, %s, %d, %d, %d, %d, "
616 "%u, %s, %d, %d, %d, %d, "
618 srcName
, _mesa_enum_to_string(srcTarget
), srcLevel
,
620 dstName
, _mesa_enum_to_string(dstTarget
), dstLevel
,
622 srcWidth
, srcHeight
, srcDepth
);
624 if (!ctx
->Extensions
.ARB_copy_image
) {
625 _mesa_error(ctx
, GL_INVALID_OPERATION
,
626 "glCopyImageSubData(extension not available)");
630 if (!prepare_target_err(ctx
, srcName
, srcTarget
, srcLevel
, srcZ
, srcDepth
,
631 &srcTexImage
, &srcRenderbuffer
, &srcFormat
,
632 &srcIntFormat
, &src_w
, &src_h
, &src_num_samples
,
636 if (!prepare_target_err(ctx
, dstName
, dstTarget
, dstLevel
, dstZ
, srcDepth
,
637 &dstTexImage
, &dstRenderbuffer
, &dstFormat
,
638 &dstIntFormat
, &dst_w
, &dst_h
, &dst_num_samples
,
642 _mesa_get_format_block_size(srcFormat
, &src_bw
, &src_bh
);
644 /* Section 18.3.2 (Copying Between Images) of the OpenGL 4.5 Core Profile
647 * An INVALID_VALUE error is generated if the dimensions of either
648 * subregion exceeds the boundaries of the corresponding image object,
649 * or if the image format is compressed and the dimensions of the
650 * subregion fail to meet the alignment constraints of the format.
652 * and Section 8.7 (Compressed Texture Images) says:
654 * An INVALID_OPERATION error is generated if any of the following
657 * * width is not a multiple of four, and width + xoffset is not
658 * equal to the value of TEXTURE_WIDTH.
659 * * height is not a multiple of four, and height + yoffset is not
660 * equal to the value of TEXTURE_HEIGHT.
662 * so we take that to mean that you can copy the "last" block of a
663 * compressed texture image even if it's smaller than the minimum block
666 if ((srcX
% src_bw
!= 0) || (srcY
% src_bh
!= 0) ||
667 (srcWidth
% src_bw
!= 0 && (srcX
+ srcWidth
) != src_w
) ||
668 (srcHeight
% src_bh
!= 0 && (srcY
+ srcHeight
) != src_h
)) {
669 _mesa_error(ctx
, GL_INVALID_VALUE
,
670 "glCopyImageSubData(unaligned src rectangle)");
674 _mesa_get_format_block_size(dstFormat
, &dst_bw
, &dst_bh
);
675 if ((dstX
% dst_bw
!= 0) || (dstY
% dst_bh
!= 0)) {
676 _mesa_error(ctx
, GL_INVALID_VALUE
,
677 "glCopyImageSubData(unaligned dst rectangle)");
681 /* From the GL_ARB_copy_image spec:
683 * "The dimensions are always specified in texels, even for compressed
684 * texture formats. But it should be noted that if only one of the
685 * source and destination textures is compressed then the number of
686 * texels touched in the compressed image will be a factor of the
687 * block size larger than in the uncompressed image."
689 * So, if copying from compressed to uncompressed, the dest region is
690 * shrunk by the src block size factor. If copying from uncompressed
691 * to compressed, the dest region is grown by the dest block size factor.
692 * Note that we're passed the _source_ width, height, depth and those
693 * dimensions are never changed.
695 dstWidth
= srcWidth
* dst_bw
/ src_bw
;
696 dstHeight
= srcHeight
* dst_bh
/ src_bh
;
699 if (!check_region_bounds(ctx
, srcTarget
, srcTexImage
, srcRenderbuffer
,
700 srcX
, srcY
, srcZ
, srcWidth
, srcHeight
, srcDepth
,
704 if (!check_region_bounds(ctx
, dstTarget
, dstTexImage
, dstRenderbuffer
,
705 dstX
, dstY
, dstZ
, dstWidth
, dstHeight
, dstDepth
,
709 /* Section 18.3.2 (Copying Between Images) of the OpenGL 4.5 Core Profile
712 * An INVALID_OPERATION error is generated if either object is a texture
713 * and the texture is not complete, if the source and destination internal
714 * formats are not compatible, or if the number of samples do not match.
716 if (!copy_format_compatible(ctx
, srcIntFormat
, dstIntFormat
)) {
717 _mesa_error(ctx
, GL_INVALID_OPERATION
,
718 "glCopyImageSubData(internalFormat mismatch)");
722 if (src_num_samples
!= dst_num_samples
) {
723 _mesa_error(ctx
, GL_INVALID_OPERATION
,
724 "glCopyImageSubData(number of samples mismatch)");
728 copy_image_subdata(ctx
, srcTexImage
, srcRenderbuffer
, srcX
, srcY
, srcZ
,
729 srcLevel
, dstTexImage
, dstRenderbuffer
, dstX
, dstY
, dstZ
,
730 dstLevel
, srcWidth
, srcHeight
, srcDepth
);