/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "main/glheader.h"
#include "main/condrender.h"
#include "main/image.h"
#include "main/macros.h"
#include "main/format_unpack.h"
#include "main/format_pack.h"
#include "main/condrender.h"
#include "s_context.h"
#define ABS(X) ((X) < 0 ? -(X) : (X))
/**
* Generate a row resampler function for GL_NEAREST mode.
*/
#define RESAMPLE(NAME, PIXELTYPE, SIZE) \
static void \
NAME(GLint srcWidth, GLint dstWidth, \
const GLvoid *srcBuffer, GLvoid *dstBuffer, \
GLboolean flip) \
{ \
const PIXELTYPE *src = (const PIXELTYPE *) srcBuffer;\
PIXELTYPE *dst = (PIXELTYPE *) dstBuffer; \
GLint dstCol; \
\
if (flip) { \
for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
GLint srcCol = (dstCol * srcWidth) / dstWidth; \
assert(srcCol >= 0); \
assert(srcCol < srcWidth); \
srcCol = srcWidth - 1 - srcCol; /* flip */ \
if (SIZE == 1) { \
dst[dstCol] = src[srcCol]; \
} \
else if (SIZE == 2) { \
dst[dstCol*2+0] = src[srcCol*2+0]; \
dst[dstCol*2+1] = src[srcCol*2+1]; \
} \
else if (SIZE == 4) { \
dst[dstCol*4+0] = src[srcCol*4+0]; \
dst[dstCol*4+1] = src[srcCol*4+1]; \
dst[dstCol*4+2] = src[srcCol*4+2]; \
dst[dstCol*4+3] = src[srcCol*4+3]; \
} \
} \
} \
else { \
for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
GLint srcCol = (dstCol * srcWidth) / dstWidth; \
assert(srcCol >= 0); \
assert(srcCol < srcWidth); \
if (SIZE == 1) { \
dst[dstCol] = src[srcCol]; \
} \
else if (SIZE == 2) { \
dst[dstCol*2+0] = src[srcCol*2+0]; \
dst[dstCol*2+1] = src[srcCol*2+1]; \
} \
else if (SIZE == 4) { \
dst[dstCol*4+0] = src[srcCol*4+0]; \
dst[dstCol*4+1] = src[srcCol*4+1]; \
dst[dstCol*4+2] = src[srcCol*4+2]; \
dst[dstCol*4+3] = src[srcCol*4+3]; \
} \
} \
} \
}
/**
* Resamplers for 1, 2, 4, 8 and 16-byte pixels.
*/
RESAMPLE(resample_row_1, GLubyte, 1)
RESAMPLE(resample_row_2, GLushort, 1)
RESAMPLE(resample_row_4, GLuint, 1)
RESAMPLE(resample_row_8, GLuint, 2)
RESAMPLE(resample_row_16, GLuint, 4)
/**
* Blit color, depth or stencil with GL_NEAREST filtering.
*/
static void
blit_nearest(struct gl_context *ctx,
struct gl_framebuffer *readFb,
struct gl_framebuffer *drawFb,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield buffer)
{
struct gl_renderbuffer *readRb, *drawRb = NULL;
struct gl_renderbuffer_attachment *readAtt = NULL, *drawAtt = NULL;
GLuint numDrawBuffers = 0;
GLuint i;
const GLint srcWidth = ABS(srcX1 - srcX0);
const GLint dstWidth = ABS(dstX1 - dstX0);
const GLint srcHeight = ABS(srcY1 - srcY0);
const GLint dstHeight = ABS(dstY1 - dstY0);
const GLint srcXpos = MIN2(srcX0, srcX1);
const GLint srcYpos = MIN2(srcY0, srcY1);
const GLint dstXpos = MIN2(dstX0, dstX1);
const GLint dstYpos = MIN2(dstY0, dstY1);
const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
enum mode {
DIRECT,
UNPACK_RGBA_FLOAT,
UNPACK_Z_FLOAT,
UNPACK_Z_INT,
UNPACK_S,
} mode = DIRECT;
GLubyte *srcMap, *dstMap;
GLint srcRowStride, dstRowStride;
GLint dstRow;
GLint pixelSize = 0;
GLvoid *srcBuffer, *dstBuffer;
GLint prevY = -1;
typedef void (*resample_func)(GLint srcWidth, GLint dstWidth,
const GLvoid *srcBuffer, GLvoid *dstBuffer,
GLboolean flip);
resample_func resampleRow;
switch (buffer) {
case GL_COLOR_BUFFER_BIT:
readAtt = &readFb->Attachment[readFb->_ColorReadBufferIndex];
readRb = readFb->_ColorReadBuffer;
numDrawBuffers = drawFb->_NumColorDrawBuffers;
break;
case GL_DEPTH_BUFFER_BIT:
readAtt = &readFb->Attachment[BUFFER_DEPTH];
drawAtt = &drawFb->Attachment[BUFFER_DEPTH];
readRb = readAtt->Renderbuffer;
drawRb = drawAtt->Renderbuffer;
numDrawBuffers = 1;
/* Note that for depth/stencil, the formats of src/dst must match. By
* using the core helpers for pack/unpack, we avoid needing to handle
* masking for things like DEPTH copies of Z24S8.
*/
if (readRb->Format == MESA_FORMAT_Z_FLOAT32 ||
readRb->Format == MESA_FORMAT_Z32_FLOAT_S8X24_UINT) {
mode = UNPACK_Z_FLOAT;
} else {
mode = UNPACK_Z_INT;
}
pixelSize = 4;
break;
case GL_STENCIL_BUFFER_BIT:
readAtt = &readFb->Attachment[BUFFER_STENCIL];
drawAtt = &drawFb->Attachment[BUFFER_STENCIL];
readRb = readAtt->Renderbuffer;
drawRb = drawAtt->Renderbuffer;
numDrawBuffers = 1;
mode = UNPACK_S;
pixelSize = 1;
break;
default:
_mesa_problem(ctx, "unexpected buffer in blit_nearest()");
return;
}
/* allocate the src/dst row buffers */
srcBuffer = malloc(MAX_PIXEL_BYTES * srcWidth);
dstBuffer = malloc(MAX_PIXEL_BYTES * dstWidth);
if (!srcBuffer || !dstBuffer)
goto fail_no_memory;
/* Blit to all the draw buffers */
for (i = 0; i < numDrawBuffers; i++) {
if (buffer == GL_COLOR_BUFFER_BIT) {
gl_buffer_index idx = drawFb->_ColorDrawBufferIndexes[i];
if (idx == BUFFER_NONE)
continue;
drawAtt = &drawFb->Attachment[idx];
drawRb = drawAtt->Renderbuffer;
if (!drawRb)
continue;
if (readRb->Format == drawRb->Format) {
mode = DIRECT;
pixelSize = _mesa_get_format_bytes(readRb->Format);
} else {
mode = UNPACK_RGBA_FLOAT;
pixelSize = 16;
}
}
/* choose row resampler */
switch (pixelSize) {
case 1:
resampleRow = resample_row_1;
break;
case 2:
resampleRow = resample_row_2;
break;
case 4:
resampleRow = resample_row_4;
break;
case 8:
resampleRow = resample_row_8;
break;
case 16:
resampleRow = resample_row_16;
break;
default:
_mesa_problem(ctx, "unexpected pixel size (%d) in blit_nearest",
pixelSize);
goto fail;
}
if ((readRb == drawRb) ||
(readAtt->Texture && drawAtt->Texture &&
(readAtt->Texture == drawAtt->Texture))) {
/* map whole buffer for read/write */
/* XXX we could be clever and just map the union region of the
* source and dest rects.
*/
GLubyte *map;
GLint rowStride;
GLint formatSize = _mesa_get_format_bytes(readRb->Format);
ctx->Driver.MapRenderbuffer(ctx, readRb, 0, 0,
readRb->Width, readRb->Height,
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
&map, &rowStride);
if (!map) {
goto fail_no_memory;
}
srcMap = map + srcYpos * rowStride + srcXpos * formatSize;
dstMap = map + dstYpos * rowStride + dstXpos * formatSize;
/* this handles overlapping copies */
if (srcY0 < dstY0) {
/* copy in reverse (top->down) order */
srcMap += rowStride * (readRb->Height - 1);
dstMap += rowStride * (readRb->Height - 1);
srcRowStride = -rowStride;
dstRowStride = -rowStride;
}
else {
/* copy in normal (bottom->up) order */
srcRowStride = rowStride;
dstRowStride = rowStride;
}
}
else {
/* different src/dst buffers */
ctx->Driver.MapRenderbuffer(ctx, readRb,
srcXpos, srcYpos,
srcWidth, srcHeight,
GL_MAP_READ_BIT, &srcMap, &srcRowStride);
if (!srcMap) {
goto fail_no_memory;
}
ctx->Driver.MapRenderbuffer(ctx, drawRb,
dstXpos, dstYpos,
dstWidth, dstHeight,
GL_MAP_WRITE_BIT, &dstMap, &dstRowStride);
if (!dstMap) {
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
goto fail_no_memory;
}
}
for (dstRow = 0; dstRow < dstHeight; dstRow++) {
GLfloat srcRowF = (dstRow + 0.5F) / dstHeight * srcHeight - 0.5F;
GLint srcRow = IROUND(srcRowF);
GLubyte *dstRowStart = dstMap + dstRowStride * dstRow;
assert(srcRow >= 0);
assert(srcRow < srcHeight);
if (invertY) {
srcRow = srcHeight - 1 - srcRow;
}
/* get pixel row from source and resample to match dest width */
if (prevY != srcRow) {
GLubyte *srcRowStart = srcMap + srcRowStride * srcRow;
switch (mode) {
case DIRECT:
memcpy(srcBuffer, srcRowStart, pixelSize * srcWidth);
break;
case UNPACK_RGBA_FLOAT:
_mesa_unpack_rgba_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_Z_FLOAT:
_mesa_unpack_float_z_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_Z_INT:
_mesa_unpack_uint_z_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_S:
_mesa_unpack_ubyte_stencil_row(readRb->Format, srcWidth,
srcRowStart, srcBuffer);
break;
}
(*resampleRow)(srcWidth, dstWidth, srcBuffer, dstBuffer, invertX);
prevY = srcRow;
}
/* store pixel row in destination */
switch (mode) {
case DIRECT:
memcpy(dstRowStart, dstBuffer, pixelSize * dstWidth);
break;
case UNPACK_RGBA_FLOAT:
_mesa_pack_float_rgba_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_Z_FLOAT:
_mesa_pack_float_z_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_Z_INT:
_mesa_pack_uint_z_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_S:
_mesa_pack_ubyte_stencil_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
}
}
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
if (drawRb != readRb) {
ctx->Driver.UnmapRenderbuffer(ctx, drawRb);
}
}
fail:
free(srcBuffer);
free(dstBuffer);
return;
fail_no_memory:
free(srcBuffer);
free(dstBuffer);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBuffer");
}
#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
static inline GLfloat
lerp_2d(GLfloat a, GLfloat b,
GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
{
const GLfloat temp0 = LERP(a, v00, v10);
const GLfloat temp1 = LERP(a, v01, v11);
return LERP(b, temp0, temp1);
}
/**
* Bilinear interpolation of two source rows.
* GLubyte pixels.
*/
static void
resample_linear_row_ub(GLint srcWidth, GLint dstWidth,
const GLvoid *srcBuffer0, const GLvoid *srcBuffer1,
GLvoid *dstBuffer, GLboolean flip, GLfloat rowWeight)
{
const GLubyte (*srcColor0)[4] = (const GLubyte (*)[4]) srcBuffer0;
const GLubyte (*srcColor1)[4] = (const GLubyte (*)[4]) srcBuffer1;
GLubyte (*dstColor)[4] = (GLubyte (*)[4]) dstBuffer;
GLint dstCol;
for (dstCol = 0; dstCol < dstWidth; dstCol++) {
const GLfloat srcCol = (dstCol + 0.5F) / dstWidth * srcWidth - 0.5F;
GLint srcCol0 = MAX2(0, IFLOOR(srcCol));
GLint srcCol1 = srcCol0 + 1;
GLfloat colWeight = srcCol - srcCol0; /* fractional part of srcCol */
GLfloat red, green, blue, alpha;
assert(srcCol0 < srcWidth);
assert(srcCol1 <= srcWidth);
if (srcCol1 == srcWidth) {
/* last column fudge */
srcCol1--;
colWeight = 0.0;
}
if (flip) {
srcCol0 = srcWidth - 1 - srcCol0;
srcCol1 = srcWidth - 1 - srcCol1;
}
red = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][RCOMP], srcColor0[srcCol1][RCOMP],
srcColor1[srcCol0][RCOMP], srcColor1[srcCol1][RCOMP]);
green = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][GCOMP], srcColor0[srcCol1][GCOMP],
srcColor1[srcCol0][GCOMP], srcColor1[srcCol1][GCOMP]);
blue = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][BCOMP], srcColor0[srcCol1][BCOMP],
srcColor1[srcCol0][BCOMP], srcColor1[srcCol1][BCOMP]);
alpha = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][ACOMP], srcColor0[srcCol1][ACOMP],
srcColor1[srcCol0][ACOMP], srcColor1[srcCol1][ACOMP]);
dstColor[dstCol][RCOMP] = IFLOOR(red);
dstColor[dstCol][GCOMP] = IFLOOR(green);
dstColor[dstCol][BCOMP] = IFLOOR(blue);
dstColor[dstCol][ACOMP] = IFLOOR(alpha);
}
}
/**
* Bilinear interpolation of two source rows. floating point pixels.
*/
static void
resample_linear_row_float(GLint srcWidth, GLint dstWidth,
const GLvoid *srcBuffer0, const GLvoid *srcBuffer1,
GLvoid *dstBuffer, GLboolean flip, GLfloat rowWeight)
{
const GLfloat (*srcColor0)[4] = (const GLfloat (*)[4]) srcBuffer0;
const GLfloat (*srcColor1)[4] = (const GLfloat (*)[4]) srcBuffer1;
GLfloat (*dstColor)[4] = (GLfloat (*)[4]) dstBuffer;
GLint dstCol;
for (dstCol = 0; dstCol < dstWidth; dstCol++) {
const GLfloat srcCol = (dstCol + 0.5F) / dstWidth * srcWidth - 0.5F;
GLint srcCol0 = MAX2(0, IFLOOR(srcCol));
GLint srcCol1 = srcCol0 + 1;
GLfloat colWeight = srcCol - srcCol0; /* fractional part of srcCol */
GLfloat red, green, blue, alpha;
assert(srcCol0 < srcWidth);
assert(srcCol1 <= srcWidth);
if (srcCol1 == srcWidth) {
/* last column fudge */
srcCol1--;
colWeight = 0.0;
}
if (flip) {
srcCol0 = srcWidth - 1 - srcCol0;
srcCol1 = srcWidth - 1 - srcCol1;
}
red = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][RCOMP], srcColor0[srcCol1][RCOMP],
srcColor1[srcCol0][RCOMP], srcColor1[srcCol1][RCOMP]);
green = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][GCOMP], srcColor0[srcCol1][GCOMP],
srcColor1[srcCol0][GCOMP], srcColor1[srcCol1][GCOMP]);
blue = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][BCOMP], srcColor0[srcCol1][BCOMP],
srcColor1[srcCol0][BCOMP], srcColor1[srcCol1][BCOMP]);
alpha = lerp_2d(colWeight, rowWeight,
srcColor0[srcCol0][ACOMP], srcColor0[srcCol1][ACOMP],
srcColor1[srcCol0][ACOMP], srcColor1[srcCol1][ACOMP]);
dstColor[dstCol][RCOMP] = red;
dstColor[dstCol][GCOMP] = green;
dstColor[dstCol][BCOMP] = blue;
dstColor[dstCol][ACOMP] = alpha;
}
}
/**
* Bilinear filtered blit (color only, non-integer values).
*/
static void
blit_linear(struct gl_context *ctx,
struct gl_framebuffer *readFb,
struct gl_framebuffer *drawFb,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
{
struct gl_renderbuffer *readRb = readFb->_ColorReadBuffer;
struct gl_renderbuffer_attachment *readAtt =
&readFb->Attachment[readFb->_ColorReadBufferIndex];
const GLint srcWidth = ABS(srcX1 - srcX0);
const GLint dstWidth = ABS(dstX1 - dstX0);
const GLint srcHeight = ABS(srcY1 - srcY0);
const GLint dstHeight = ABS(dstY1 - dstY0);
const GLint srcXpos = MIN2(srcX0, srcX1);
const GLint srcYpos = MIN2(srcY0, srcY1);
const GLint dstXpos = MIN2(dstX0, dstX1);
const GLint dstYpos = MIN2(dstY0, dstY1);
const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
GLint dstRow;
GLint pixelSize;
GLvoid *srcBuffer0, *srcBuffer1;
GLint srcBufferY0 = -1, srcBufferY1 = -1;
GLvoid *dstBuffer;
mesa_format readFormat = _mesa_get_srgb_format_linear(readRb->Format);
GLuint bpp = _mesa_get_format_bytes(readFormat);
GLenum pixelType;
GLubyte *srcMap, *dstMap;
GLint srcRowStride, dstRowStride;
GLuint i;
/* Determine datatype for resampling */
if (_mesa_get_format_max_bits(readFormat) == 8 &&
_mesa_get_format_datatype(readFormat) == GL_UNSIGNED_NORMALIZED) {
pixelType = GL_UNSIGNED_BYTE;
pixelSize = 4 * sizeof(GLubyte);
}
else {
pixelType = GL_FLOAT;
pixelSize = 4 * sizeof(GLfloat);
}
/* Allocate the src/dst row buffers.
* Keep two adjacent src rows around for bilinear sampling.
*/
srcBuffer0 = malloc(pixelSize * srcWidth);
srcBuffer1 = malloc(pixelSize * srcWidth);
dstBuffer = malloc(pixelSize * dstWidth);
if (!srcBuffer0 || !srcBuffer1 || !dstBuffer) {
goto fail_no_memory;
}
for (i = 0; i < drawFb->_NumColorDrawBuffers; i++) {
gl_buffer_index idx = drawFb->_ColorDrawBufferIndexes[i];
struct gl_renderbuffer_attachment *drawAtt;
struct gl_renderbuffer *drawRb;
mesa_format drawFormat;
if (idx == BUFFER_NONE)
continue;
drawAtt = &drawFb->Attachment[idx];
drawRb = drawAtt->Renderbuffer;
if (!drawRb)
continue;
drawFormat = _mesa_get_srgb_format_linear(drawRb->Format);
/*
* Map src / dst renderbuffers
*/
if ((readRb == drawRb) ||
(readAtt->Texture && drawAtt->Texture &&
(readAtt->Texture == drawAtt->Texture))) {
/* map whole buffer for read/write */
ctx->Driver.MapRenderbuffer(ctx, readRb,
0, 0, readRb->Width, readRb->Height,
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
&srcMap, &srcRowStride);
if (!srcMap) {
goto fail_no_memory;
}
dstMap = srcMap;
dstRowStride = srcRowStride;
}
else {
/* different src/dst buffers */
/* XXX with a bit of work we could just map the regions to be
* read/written instead of the whole buffers.
*/
ctx->Driver.MapRenderbuffer(ctx, readRb,
0, 0, readRb->Width, readRb->Height,
GL_MAP_READ_BIT, &srcMap, &srcRowStride);
if (!srcMap) {
goto fail_no_memory;
}
ctx->Driver.MapRenderbuffer(ctx, drawRb,
0, 0, drawRb->Width, drawRb->Height,
GL_MAP_WRITE_BIT, &dstMap, &dstRowStride);
if (!dstMap) {
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
goto fail_no_memory;
}
}
for (dstRow = 0; dstRow < dstHeight; dstRow++) {
const GLint dstY = dstYpos + dstRow;
GLfloat srcRow = (dstRow + 0.5F) / dstHeight * srcHeight - 0.5F;
GLint srcRow0 = MAX2(0, IFLOOR(srcRow));
GLint srcRow1 = srcRow0 + 1;
GLfloat rowWeight = srcRow - srcRow0; /* fractional part of srcRow */
if (srcRow1 == srcHeight) {
/* last row fudge */
srcRow1 = srcRow0;
rowWeight = 0.0;
}
if (invertY) {
srcRow0 = srcHeight - 1 - srcRow0;
srcRow1 = srcHeight - 1 - srcRow1;
}
srcY0 = srcYpos + srcRow0;
srcY1 = srcYpos + srcRow1;
/* get the two source rows */
if (srcY0 == srcBufferY0 && srcY1 == srcBufferY1) {
/* use same source row buffers again */
}
else if (srcY0 == srcBufferY1) {
/* move buffer1 into buffer0 by swapping pointers */
GLvoid *tmp = srcBuffer0;
srcBuffer0 = srcBuffer1;
srcBuffer1 = tmp;
/* get y1 row */
{
GLubyte *src = srcMap + srcY1 * srcRowStride + srcXpos * bpp;
if (pixelType == GL_UNSIGNED_BYTE) {
_mesa_unpack_ubyte_rgba_row(readFormat, srcWidth,
src, srcBuffer1);
}
else {
_mesa_unpack_rgba_row(readFormat, srcWidth,
src, srcBuffer1);
}
}
srcBufferY0 = srcY0;
srcBufferY1 = srcY1;
}
else {
/* get both new rows */
{
GLubyte *src0 = srcMap + srcY0 * srcRowStride + srcXpos * bpp;
GLubyte *src1 = srcMap + srcY1 * srcRowStride + srcXpos * bpp;
if (pixelType == GL_UNSIGNED_BYTE) {
_mesa_unpack_ubyte_rgba_row(readFormat, srcWidth,
src0, srcBuffer0);
_mesa_unpack_ubyte_rgba_row(readFormat, srcWidth,
src1, srcBuffer1);
}
else {
_mesa_unpack_rgba_row(readFormat, srcWidth, src0, srcBuffer0);
_mesa_unpack_rgba_row(readFormat, srcWidth, src1, srcBuffer1);
}
}
srcBufferY0 = srcY0;
srcBufferY1 = srcY1;
}
if (pixelType == GL_UNSIGNED_BYTE) {
resample_linear_row_ub(srcWidth, dstWidth, srcBuffer0, srcBuffer1,
dstBuffer, invertX, rowWeight);
}
else {
resample_linear_row_float(srcWidth, dstWidth, srcBuffer0, srcBuffer1,
dstBuffer, invertX, rowWeight);
}
/* store pixel row in destination */
{
GLubyte *dst = dstMap + dstY * dstRowStride + dstXpos * bpp;
if (pixelType == GL_UNSIGNED_BYTE) {
_mesa_pack_ubyte_rgba_row(drawFormat, dstWidth, dstBuffer, dst);
}
else {
_mesa_pack_float_rgba_row(drawFormat, dstWidth, dstBuffer, dst);
}
}
}
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
if (drawRb != readRb) {
ctx->Driver.UnmapRenderbuffer(ctx, drawRb);
}
}
free(srcBuffer0);
free(srcBuffer1);
free(dstBuffer);
return;
fail_no_memory:
free(srcBuffer0);
free(srcBuffer1);
free(dstBuffer);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFramebuffer");
}
/**
* Software fallback for glBlitFramebufferEXT().
*/
void
_swrast_BlitFramebuffer(struct gl_context *ctx,
struct gl_framebuffer *readFb,
struct gl_framebuffer *drawFb,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield mask, GLenum filter)
{
static const GLbitfield buffers[3] = {
GL_COLOR_BUFFER_BIT,
GL_DEPTH_BUFFER_BIT,
GL_STENCIL_BUFFER_BIT
};
static const GLenum buffer_enums[3] = {
GL_COLOR,
GL_DEPTH,
GL_STENCIL,
};
GLint i;
/* Page 679 of OpenGL 4.4 spec says:
* "Added BlitFramebuffer to commands affected by conditional rendering in
* section 10.10 (Bug 9562)."
*/
if (!_mesa_check_conditional_render(ctx))
return; /* Do not blit */
if (!_mesa_clip_blit(ctx, readFb, drawFb, &srcX0, &srcY0, &srcX1, &srcY1,
&dstX0, &dstY0, &dstX1, &dstY1)) {
return;
}
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived(ctx);
/* First, try covering whatever buffers possible using the fast 1:1 copy
* path.
*/
if (srcX1 - srcX0 == dstX1 - dstX0 &&
srcY1 - srcY0 == dstY1 - dstY0 &&
srcX0 < srcX1 &&
srcY0 < srcY1 &&
dstX0 < dstX1 &&
dstY0 < dstY1) {
for (i = 0; i < 3; i++) {
if (mask & buffers[i]) {
if (swrast_fast_copy_pixels(ctx,
readFb, drawFb,
srcX0, srcY0,
srcX1 - srcX0, srcY1 - srcY0,
dstX0, dstY0,
buffer_enums[i])) {
mask &= ~buffers[i];
}
}
}
if (!mask)
return;
}
if (filter == GL_NEAREST) {
for (i = 0; i < 3; i++) {
if (mask & buffers[i]) {
blit_nearest(ctx, readFb, drawFb, srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1, buffers[i]);
}
}
}
else {
assert(filter == GL_LINEAR);
if (mask & GL_COLOR_BUFFER_BIT) { /* depth/stencil not allowed */
blit_linear(ctx, readFb, drawFb, srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1);
}
}
}