2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include "main/glheader.h"
27 #include "main/condrender.h"
28 #include "main/image.h"
29 #include "main/macros.h"
30 #include "s_context.h"
33 #define ABS(X) ((X) < 0 ? -(X) : (X))
37 * Generate a row resampler function for GL_NEAREST mode.
39 #define RESAMPLE(NAME, PIXELTYPE, SIZE) \
41 NAME(GLint srcWidth, GLint dstWidth, \
42 const GLvoid *srcBuffer, GLvoid *dstBuffer, \
45 const PIXELTYPE *src = (const PIXELTYPE *) srcBuffer;\
46 PIXELTYPE *dst = (PIXELTYPE *) dstBuffer; \
50 for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
51 GLint srcCol = (dstCol * srcWidth) / dstWidth; \
52 ASSERT(srcCol >= 0); \
53 ASSERT(srcCol < srcWidth); \
54 srcCol = srcWidth - 1 - srcCol; /* flip */ \
56 dst[dstCol] = src[srcCol]; \
58 else if (SIZE == 2) { \
59 dst[dstCol*2+0] = src[srcCol*2+0]; \
60 dst[dstCol*2+1] = src[srcCol*2+1]; \
62 else if (SIZE == 4) { \
63 dst[dstCol*4+0] = src[srcCol*4+0]; \
64 dst[dstCol*4+1] = src[srcCol*4+1]; \
65 dst[dstCol*4+2] = src[srcCol*4+2]; \
66 dst[dstCol*4+3] = src[srcCol*4+3]; \
71 for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
72 GLint srcCol = (dstCol * srcWidth) / dstWidth; \
73 ASSERT(srcCol >= 0); \
74 ASSERT(srcCol < srcWidth); \
76 dst[dstCol] = src[srcCol]; \
78 else if (SIZE == 2) { \
79 dst[dstCol*2+0] = src[srcCol*2+0]; \
80 dst[dstCol*2+1] = src[srcCol*2+1]; \
82 else if (SIZE == 4) { \
83 dst[dstCol*4+0] = src[srcCol*4+0]; \
84 dst[dstCol*4+1] = src[srcCol*4+1]; \
85 dst[dstCol*4+2] = src[srcCol*4+2]; \
86 dst[dstCol*4+3] = src[srcCol*4+3]; \
93 * Resamplers for 1, 2, 4, 8 and 16-byte pixels.
95 RESAMPLE(resample_row_1
, GLubyte
, 1)
96 RESAMPLE(resample_row_2
, GLushort
, 1)
97 RESAMPLE(resample_row_4
, GLuint
, 1)
98 RESAMPLE(resample_row_8
, GLuint
, 2)
99 RESAMPLE(resample_row_16
, GLuint
, 4)
103 * Blit color, depth or stencil with GL_NEAREST filtering.
106 blit_nearest(GLcontext
*ctx
,
107 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
108 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
111 struct gl_renderbuffer
*readRb
, *drawRb
;
113 const GLint srcWidth
= ABS(srcX1
- srcX0
);
114 const GLint dstWidth
= ABS(dstX1
- dstX0
);
115 const GLint srcHeight
= ABS(srcY1
- srcY0
);
116 const GLint dstHeight
= ABS(dstY1
- dstY0
);
118 const GLint srcXpos
= MIN2(srcX0
, srcX1
);
119 const GLint srcYpos
= MIN2(srcY0
, srcY1
);
120 const GLint dstXpos
= MIN2(dstX0
, dstX1
);
121 const GLint dstYpos
= MIN2(dstY0
, dstY1
);
123 const GLboolean invertX
= (srcX1
< srcX0
) ^ (dstX1
< dstX0
);
124 const GLboolean invertY
= (srcY1
< srcY0
) ^ (dstY1
< dstY0
);
128 GLint comps
, pixelSize
;
129 GLvoid
*srcBuffer
, *dstBuffer
;
132 typedef void (*resample_func
)(GLint srcWidth
, GLint dstWidth
,
133 const GLvoid
*srcBuffer
, GLvoid
*dstBuffer
,
135 resample_func resampleRow
;
138 case GL_COLOR_BUFFER_BIT
:
139 readRb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
140 drawRb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[0];
143 case GL_DEPTH_BUFFER_BIT
:
144 readRb
= ctx
->ReadBuffer
->_DepthBuffer
;
145 drawRb
= ctx
->DrawBuffer
->_DepthBuffer
;
148 case GL_STENCIL_BUFFER_BIT
:
149 readRb
= ctx
->ReadBuffer
->_StencilBuffer
;
150 drawRb
= ctx
->DrawBuffer
->_StencilBuffer
;
154 _mesa_problem(ctx
, "unexpected buffer in blit_nearest()");
158 switch (readRb
->DataType
) {
159 case GL_UNSIGNED_BYTE
:
160 pixelSize
= comps
* sizeof(GLubyte
);
162 case GL_UNSIGNED_SHORT
:
163 pixelSize
= comps
* sizeof(GLushort
);
165 case GL_UNSIGNED_INT
:
166 pixelSize
= comps
* sizeof(GLuint
);
169 pixelSize
= comps
* sizeof(GLfloat
);
172 _mesa_problem(ctx
, "unexpected buffer type (0x%x) in blit_nearest",
177 /* choose row resampler */
180 resampleRow
= resample_row_1
;
183 resampleRow
= resample_row_2
;
186 resampleRow
= resample_row_4
;
189 resampleRow
= resample_row_8
;
192 resampleRow
= resample_row_16
;
195 _mesa_problem(ctx
, "unexpected pixel size (%d) in blit_nearest",
200 /* allocate the src/dst row buffers */
201 srcBuffer
= malloc(pixelSize
* srcWidth
);
203 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
206 dstBuffer
= malloc(pixelSize
* dstWidth
);
209 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
213 for (dstRow
= 0; dstRow
< dstHeight
; dstRow
++) {
214 const GLint dstY
= dstYpos
+ dstRow
;
215 GLint srcRow
= (dstRow
* srcHeight
) / dstHeight
;
219 ASSERT(srcRow
< srcHeight
);
222 srcRow
= srcHeight
- 1 - srcRow
;
225 srcY
= srcYpos
+ srcRow
;
227 /* get pixel row from source and resample to match dest width */
229 readRb
->GetRow(ctx
, readRb
, srcWidth
, srcXpos
, srcY
, srcBuffer
);
230 (*resampleRow
)(srcWidth
, dstWidth
, srcBuffer
, dstBuffer
, invertX
);
234 /* store pixel row in destination */
235 drawRb
->PutRow(ctx
, drawRb
, dstWidth
, dstXpos
, dstY
, dstBuffer
, NULL
);
244 #define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
246 static INLINE GLfloat
247 lerp_2d(GLfloat a
, GLfloat b
,
248 GLfloat v00
, GLfloat v10
, GLfloat v01
, GLfloat v11
)
250 const GLfloat temp0
= LERP(a
, v00
, v10
);
251 const GLfloat temp1
= LERP(a
, v01
, v11
);
252 return LERP(b
, temp0
, temp1
);
257 * Bilinear interpolation of two source rows.
261 resample_linear_row_ub(GLint srcWidth
, GLint dstWidth
,
262 const GLvoid
*srcBuffer0
, const GLvoid
*srcBuffer1
,
263 GLvoid
*dstBuffer
, GLboolean flip
, GLfloat rowWeight
)
265 const GLubyte (*srcColor0
)[4] = (const GLubyte (*)[4]) srcBuffer0
;
266 const GLubyte (*srcColor1
)[4] = (const GLubyte (*)[4]) srcBuffer1
;
267 GLubyte (*dstColor
)[4] = (GLubyte (*)[4]) dstBuffer
;
268 const GLfloat dstWidthF
= (GLfloat
) dstWidth
;
271 for (dstCol
= 0; dstCol
< dstWidth
; dstCol
++) {
272 const GLfloat srcCol
= (dstCol
* srcWidth
) / dstWidthF
;
273 GLint srcCol0
= IFLOOR(srcCol
);
274 GLint srcCol1
= srcCol0
+ 1;
275 GLfloat colWeight
= srcCol
- srcCol0
; /* fractional part of srcCol */
276 GLfloat red
, green
, blue
, alpha
;
278 ASSERT(srcCol0
>= 0);
279 ASSERT(srcCol0
< srcWidth
);
280 ASSERT(srcCol1
<= srcWidth
);
282 if (srcCol1
== srcWidth
) {
283 /* last column fudge */
289 srcCol0
= srcWidth
- 1 - srcCol0
;
290 srcCol1
= srcWidth
- 1 - srcCol1
;
293 red
= lerp_2d(colWeight
, rowWeight
,
294 srcColor0
[srcCol0
][RCOMP
], srcColor0
[srcCol1
][RCOMP
],
295 srcColor1
[srcCol0
][RCOMP
], srcColor1
[srcCol1
][RCOMP
]);
296 green
= lerp_2d(colWeight
, rowWeight
,
297 srcColor0
[srcCol0
][GCOMP
], srcColor0
[srcCol1
][GCOMP
],
298 srcColor1
[srcCol0
][GCOMP
], srcColor1
[srcCol1
][GCOMP
]);
299 blue
= lerp_2d(colWeight
, rowWeight
,
300 srcColor0
[srcCol0
][BCOMP
], srcColor0
[srcCol1
][BCOMP
],
301 srcColor1
[srcCol0
][BCOMP
], srcColor1
[srcCol1
][BCOMP
]);
302 alpha
= lerp_2d(colWeight
, rowWeight
,
303 srcColor0
[srcCol0
][ACOMP
], srcColor0
[srcCol1
][ACOMP
],
304 srcColor1
[srcCol0
][ACOMP
], srcColor1
[srcCol1
][ACOMP
]);
306 dstColor
[dstCol
][RCOMP
] = IFLOOR(red
);
307 dstColor
[dstCol
][GCOMP
] = IFLOOR(green
);
308 dstColor
[dstCol
][BCOMP
] = IFLOOR(blue
);
309 dstColor
[dstCol
][ACOMP
] = IFLOOR(alpha
);
316 * Bilinear filtered blit (color only).
319 blit_linear(GLcontext
*ctx
,
320 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
321 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
)
323 struct gl_renderbuffer
*readRb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
324 struct gl_renderbuffer
*drawRb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[0];
326 const GLint srcWidth
= ABS(srcX1
- srcX0
);
327 const GLint dstWidth
= ABS(dstX1
- dstX0
);
328 const GLint srcHeight
= ABS(srcY1
- srcY0
);
329 const GLint dstHeight
= ABS(dstY1
- dstY0
);
330 const GLfloat dstHeightF
= (GLfloat
) dstHeight
;
332 const GLint srcXpos
= MIN2(srcX0
, srcX1
);
333 const GLint srcYpos
= MIN2(srcY0
, srcY1
);
334 const GLint dstXpos
= MIN2(dstX0
, dstX1
);
335 const GLint dstYpos
= MIN2(dstY0
, dstY1
);
337 const GLboolean invertX
= (srcX1
< srcX0
) ^ (dstX1
< dstX0
);
338 const GLboolean invertY
= (srcY1
< srcY0
) ^ (dstY1
< dstY0
);
343 GLvoid
*srcBuffer0
, *srcBuffer1
;
344 GLint srcBufferY0
= -1, srcBufferY1
= -1;
347 switch (readRb
->DataType
) {
348 case GL_UNSIGNED_BYTE
:
349 pixelSize
= 4 * sizeof(GLubyte
);
351 case GL_UNSIGNED_SHORT
:
352 pixelSize
= 4 * sizeof(GLushort
);
354 case GL_UNSIGNED_INT
:
355 pixelSize
= 4 * sizeof(GLuint
);
358 pixelSize
= 4 * sizeof(GLfloat
);
361 _mesa_problem(ctx
, "unexpected buffer type (0x%x) in blit_nearest",
366 /* Allocate the src/dst row buffers.
367 * Keep two adjacent src rows around for bilinear sampling.
369 srcBuffer0
= malloc(pixelSize
* srcWidth
);
371 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
374 srcBuffer1
= malloc(pixelSize
* srcWidth
);
377 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
380 dstBuffer
= malloc(pixelSize
* dstWidth
);
384 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
388 for (dstRow
= 0; dstRow
< dstHeight
; dstRow
++) {
389 const GLint dstY
= dstYpos
+ dstRow
;
390 const GLfloat srcRow
= (dstRow
* srcHeight
) / dstHeightF
;
391 GLint srcRow0
= IFLOOR(srcRow
);
392 GLint srcRow1
= srcRow0
+ 1;
393 GLfloat rowWeight
= srcRow
- srcRow0
; /* fractional part of srcRow */
396 ASSERT(srcRow
< srcHeight
);
398 if (srcRow1
== srcHeight
) {
405 srcRow0
= srcHeight
- 1 - srcRow0
;
406 srcRow1
= srcHeight
- 1 - srcRow1
;
409 srcY0
= srcYpos
+ srcRow0
;
410 srcY1
= srcYpos
+ srcRow1
;
412 /* get the two source rows */
413 if (srcY0
== srcBufferY0
&& srcY1
== srcBufferY1
) {
414 /* use same source row buffers again */
416 else if (srcY0
== srcBufferY1
) {
417 /* move buffer1 into buffer0 by swapping pointers */
418 GLvoid
*tmp
= srcBuffer0
;
419 srcBuffer0
= srcBuffer1
;
422 readRb
->GetRow(ctx
, readRb
, srcWidth
, srcXpos
, srcY1
, srcBuffer1
);
427 /* get both new rows */
428 readRb
->GetRow(ctx
, readRb
, srcWidth
, srcXpos
, srcY0
, srcBuffer0
);
429 readRb
->GetRow(ctx
, readRb
, srcWidth
, srcXpos
, srcY1
, srcBuffer1
);
434 if (readRb
->DataType
== GL_UNSIGNED_BYTE
) {
435 resample_linear_row_ub(srcWidth
, dstWidth
, srcBuffer0
, srcBuffer1
,
436 dstBuffer
, invertX
, rowWeight
);
439 _mesa_problem(ctx
, "Unsupported color channel type in sw blit");
443 /* store pixel row in destination */
444 drawRb
->PutRow(ctx
, drawRb
, dstWidth
, dstXpos
, dstY
, dstBuffer
, NULL
);
454 * Simple case: Blit color, depth or stencil with no scaling or flipping.
455 * XXX we could easily support vertical flipping here.
458 simple_blit(GLcontext
*ctx
,
459 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
460 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
463 struct gl_renderbuffer
*readRb
, *drawRb
;
464 const GLint width
= srcX1
- srcX0
;
465 const GLint height
= srcY1
- srcY0
;
466 GLint row
, srcY
, dstY
, yStep
;
467 GLint comps
, bytesPerRow
;
470 /* only one buffer */
471 ASSERT(_mesa_bitcount(buffer
) == 1);
472 /* no flipping checks */
473 ASSERT(srcX0
< srcX1
);
474 ASSERT(srcY0
< srcY1
);
475 ASSERT(dstX0
< dstX1
);
476 ASSERT(dstY0
< dstY1
);
478 ASSERT(srcX1
- srcX0
== dstX1
- dstX0
);
479 ASSERT(srcY1
- srcY0
== dstY1
- dstY0
);
481 /* determine if copy should be bottom-to-top or top-to-bottom */
483 /* src above dst: copy bottom-to-top */
489 /* src below dst: copy top-to-bottom */
496 case GL_COLOR_BUFFER_BIT
:
497 readRb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
498 drawRb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[0];
501 case GL_DEPTH_BUFFER_BIT
:
502 readRb
= ctx
->ReadBuffer
->_DepthBuffer
;
503 drawRb
= ctx
->DrawBuffer
->_DepthBuffer
;
506 case GL_STENCIL_BUFFER_BIT
:
507 readRb
= ctx
->ReadBuffer
->_StencilBuffer
;
508 drawRb
= ctx
->DrawBuffer
->_StencilBuffer
;
512 _mesa_problem(ctx
, "unexpected buffer in simple_blit()");
516 ASSERT(readRb
->DataType
== drawRb
->DataType
);
518 /* compute bytes per row */
519 switch (readRb
->DataType
) {
520 case GL_UNSIGNED_BYTE
:
521 bytesPerRow
= comps
* width
* sizeof(GLubyte
);
523 case GL_UNSIGNED_SHORT
:
524 bytesPerRow
= comps
* width
* sizeof(GLushort
);
526 case GL_UNSIGNED_INT
:
527 bytesPerRow
= comps
* width
* sizeof(GLuint
);
530 bytesPerRow
= comps
* width
* sizeof(GLfloat
);
533 _mesa_problem(ctx
, "unexpected buffer type in simple_blit");
537 /* allocate the row buffer */
538 rowBuffer
= malloc(bytesPerRow
);
540 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glBlitFrameBufferEXT");
544 for (row
= 0; row
< height
; row
++) {
545 readRb
->GetRow(ctx
, readRb
, width
, srcX0
, srcY
, rowBuffer
);
546 drawRb
->PutRow(ctx
, drawRb
, width
, dstX0
, dstY
, rowBuffer
, NULL
);
556 * Software fallback for glBlitFramebufferEXT().
559 _swrast_BlitFramebuffer(GLcontext
*ctx
,
560 GLint srcX0
, GLint srcY0
, GLint srcX1
, GLint srcY1
,
561 GLint dstX0
, GLint dstY0
, GLint dstX1
, GLint dstY1
,
562 GLbitfield mask
, GLenum filter
)
564 static const GLbitfield buffers
[3] = {
567 GL_STENCIL_BUFFER_BIT
571 if (!_mesa_check_conditional_render(ctx
))
572 return; /* don't clear */
574 if (!ctx
->DrawBuffer
->_NumColorDrawBuffers
)
577 if (!_mesa_clip_blit(ctx
, &srcX0
, &srcY0
, &srcX1
, &srcY1
,
578 &dstX0
, &dstY0
, &dstX1
, &dstY1
)) {
582 swrast_render_start(ctx
);
584 if (srcX1
- srcX0
== dstX1
- dstX0
&&
585 srcY1
- srcY0
== dstY1
- dstY0
&&
590 /* no stretching or flipping.
591 * filter doesn't matter.
593 for (i
= 0; i
< 3; i
++) {
594 if (mask
& buffers
[i
]) {
595 simple_blit(ctx
, srcX0
, srcY0
, srcX1
, srcY1
,
596 dstX0
, dstY0
, dstX1
, dstY1
, buffers
[i
]);
601 if (filter
== GL_NEAREST
) {
602 for (i
= 0; i
< 3; i
++) {
603 if (mask
& buffers
[i
]) {
604 blit_nearest(ctx
, srcX0
, srcY0
, srcX1
, srcY1
,
605 dstX0
, dstY0
, dstX1
, dstY1
, buffers
[i
]);
610 ASSERT(filter
== GL_LINEAR
);
611 if (mask
& GL_COLOR_BUFFER_BIT
) { /* depth/stencil not allowed */
612 blit_linear(ctx
, srcX0
, srcY0
, srcX1
, srcY1
,
613 dstX0
, dstY0
, dstX1
, dstY1
);
618 swrast_render_finish(ctx
);