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authormarha <marha@users.sourceforge.net>2011-03-01 07:17:23 +0000
committermarha <marha@users.sourceforge.net>2011-03-01 07:17:23 +0000
commita18769801e521ccb5a409c377ac0a6a1141f5776 (patch)
treecfc3429a80c2f996cb5592512acdebe7719d608c /mesalib/src/mesa/state_tracker/st_cb_readpixels.c
parentfeee2b5ceb37101bd1c4162e49805e6ad63e28ae (diff)
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pixman mesa git update 1 Mar 2011
Diffstat (limited to 'mesalib/src/mesa/state_tracker/st_cb_readpixels.c')
-rw-r--r--mesalib/src/mesa/state_tracker/st_cb_readpixels.c1121
1 files changed, 561 insertions, 560 deletions
diff --git a/mesalib/src/mesa/state_tracker/st_cb_readpixels.c b/mesalib/src/mesa/state_tracker/st_cb_readpixels.c
index 570873916..f8da2a4d1 100644
--- a/mesalib/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/mesalib/src/mesa/state_tracker/st_cb_readpixels.c
@@ -1,560 +1,561 @@
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * 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, sub license, 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 (including the
- * next paragraph) 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 NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
- *
- **************************************************************************/
-
-
-/**
- * glReadPixels interface to pipe
- *
- * \author Brian Paul
- */
-
-
-#include "main/imports.h"
-#include "main/bufferobj.h"
-#include "main/context.h"
-#include "main/image.h"
-#include "main/pack.h"
-
-#include "pipe/p_context.h"
-#include "pipe/p_defines.h"
-#include "util/u_format.h"
-#include "util/u_inlines.h"
-#include "util/u_tile.h"
-
-#include "st_debug.h"
-#include "st_context.h"
-#include "st_atom.h"
-#include "st_cb_bitmap.h"
-#include "st_cb_readpixels.h"
-#include "st_cb_fbo.h"
-
-/**
- * Special case for reading stencil buffer.
- * For color/depth we use get_tile(). For stencil, map the stencil buffer.
- */
-void
-st_read_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- const struct gl_pixelstore_attrib *packing,
- GLvoid *pixels)
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct pipe_context *pipe = st_context(ctx)->pipe;
- struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
- struct pipe_transfer *pt;
- ubyte *stmap;
- GLint j;
-
- if (strb->Base.Wrapped) {
- strb = st_renderbuffer(strb->Base.Wrapped);
- }
-
- if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
- y = ctx->DrawBuffer->Height - y - height;
- }
-
- /* Create a read transfer from the renderbuffer's texture */
-
- pt = pipe_get_transfer(pipe, strb->texture,
- 0, 0,
- PIPE_TRANSFER_READ,
- x, y, width, height);
-
- /* map the stencil buffer */
- stmap = pipe_transfer_map(pipe, pt);
-
- /* width should never be > MAX_WIDTH since we did clipping earlier */
- ASSERT(width <= MAX_WIDTH);
-
- /* process image row by row */
- for (j = 0; j < height; j++) {
- GLvoid *dest;
- GLstencil sValues[MAX_WIDTH];
- GLfloat zValues[MAX_WIDTH];
- GLint srcY;
-
- if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
- srcY = height - j - 1;
- }
- else {
- srcY = j;
- }
-
- /* get stencil (and Z) values */
- switch (pt->resource->format) {
- case PIPE_FORMAT_S8_USCALED:
- {
- const ubyte *src = stmap + srcY * pt->stride;
- memcpy(sValues, src, width);
- }
- break;
- case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
- if (format == GL_DEPTH_STENCIL) {
- const uint *src = (uint *) (stmap + srcY * pt->stride);
- const GLfloat scale = 1.0f / (0xffffff);
- GLint k;
- for (k = 0; k < width; k++) {
- sValues[k] = src[k] >> 24;
- zValues[k] = (src[k] & 0xffffff) * scale;
- }
- }
- else {
- const uint *src = (uint *) (stmap + srcY * pt->stride);
- GLint k;
- for (k = 0; k < width; k++) {
- sValues[k] = src[k] >> 24;
- }
- }
- break;
- case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
- if (format == GL_DEPTH_STENCIL) {
- const uint *src = (uint *) (stmap + srcY * pt->stride);
- const GLfloat scale = 1.0f / (0xffffff);
- GLint k;
- for (k = 0; k < width; k++) {
- sValues[k] = src[k] & 0xff;
- zValues[k] = (src[k] >> 8) * scale;
- }
- }
- else {
- const uint *src = (uint *) (stmap + srcY * pt->stride);
- GLint k;
- for (k = 0; k < width; k++) {
- sValues[k] = src[k] & 0xff;
- }
- }
- break;
- default:
- assert(0);
- }
-
- /* store */
- dest = _mesa_image_address2d(packing, pixels, width, height,
- format, type, j, 0);
- if (format == GL_DEPTH_STENCIL) {
- _mesa_pack_depth_stencil_span(ctx, width, dest,
- zValues, sValues, packing);
- }
- else {
- _mesa_pack_stencil_span(ctx, width, type, dest, sValues, packing);
- }
- }
-
- /* unmap the stencil buffer */
- pipe_transfer_unmap(pipe, pt);
- pipe->transfer_destroy(pipe, pt);
-}
-
-
-/**
- * Return renderbuffer to use for reading color pixels for glRead/CopyPixel
- * commands.
- */
-struct st_renderbuffer *
-st_get_color_read_renderbuffer(struct gl_context *ctx)
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct st_renderbuffer *strb =
- st_renderbuffer(fb->_ColorReadBuffer);
-
- return strb;
-}
-
-
-/**
- * Try to do glReadPixels in a fast manner for common cases.
- * \return GL_TRUE for success, GL_FALSE for failure
- */
-static GLboolean
-st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,
- GLint x, GLint y, GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- const struct gl_pixelstore_attrib *pack,
- GLvoid *dest)
-{
- enum combination {
- A8R8G8B8_UNORM_TO_RGBA_UBYTE,
- A8R8G8B8_UNORM_TO_RGB_UBYTE,
- A8R8G8B8_UNORM_TO_BGRA_UINT
- } combo;
-
- if (ctx->_ImageTransferState)
- return GL_FALSE;
-
- if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
- format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
- combo = A8R8G8B8_UNORM_TO_RGBA_UBYTE;
- }
- else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
- format == GL_RGB && type == GL_UNSIGNED_BYTE) {
- combo = A8R8G8B8_UNORM_TO_RGB_UBYTE;
- }
- else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
- format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {
- combo = A8R8G8B8_UNORM_TO_BGRA_UINT;
- }
- else {
- return GL_FALSE;
- }
-
- /*printf("st_fast_readpixels combo %d\n", (GLint) combo);*/
-
- {
- struct pipe_context *pipe = st_context(ctx)->pipe;
- struct pipe_transfer *trans;
- const GLubyte *map;
- GLubyte *dst;
- GLint row, col, dy, dstStride;
-
- if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
- /* convert GL Y to Gallium Y */
- y = strb->texture->height0 - y - height;
- }
-
- trans = pipe_get_transfer(pipe, strb->texture,
- 0, 0,
- PIPE_TRANSFER_READ,
- x, y, width, height);
- if (!trans) {
- return GL_FALSE;
- }
-
- map = pipe_transfer_map(pipe, trans);
- if (!map) {
- pipe->transfer_destroy(pipe, trans);
- return GL_FALSE;
- }
-
- /* We always write to the user/dest buffer from low addr to high addr
- * but the read order depends on renderbuffer orientation
- */
- if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
- /* read source rows from bottom to top */
- y = height - 1;
- dy = -1;
- }
- else {
- /* read source rows from top to bottom */
- y = 0;
- dy = 1;
- }
-
- dst = _mesa_image_address2d(pack, dest, width, height,
- format, type, 0, 0);
- dstStride = _mesa_image_row_stride(pack, width, format, type);
-
- switch (combo) {
- case A8R8G8B8_UNORM_TO_RGBA_UBYTE:
- for (row = 0; row < height; row++) {
- const GLubyte *src = map + y * trans->stride;
- for (col = 0; col < width; col++) {
- GLuint pixel = ((GLuint *) src)[col];
- dst[col*4+0] = (pixel >> 16) & 0xff;
- dst[col*4+1] = (pixel >> 8) & 0xff;
- dst[col*4+2] = (pixel >> 0) & 0xff;
- dst[col*4+3] = (pixel >> 24) & 0xff;
- }
- dst += dstStride;
- y += dy;
- }
- break;
- case A8R8G8B8_UNORM_TO_RGB_UBYTE:
- for (row = 0; row < height; row++) {
- const GLubyte *src = map + y * trans->stride;
- for (col = 0; col < width; col++) {
- GLuint pixel = ((GLuint *) src)[col];
- dst[col*3+0] = (pixel >> 16) & 0xff;
- dst[col*3+1] = (pixel >> 8) & 0xff;
- dst[col*3+2] = (pixel >> 0) & 0xff;
- }
- dst += dstStride;
- y += dy;
- }
- break;
- case A8R8G8B8_UNORM_TO_BGRA_UINT:
- for (row = 0; row < height; row++) {
- const GLubyte *src = map + y * trans->stride;
- memcpy(dst, src, 4 * width);
- dst += dstStride;
- y += dy;
- }
- break;
- default:
- ; /* nothing */
- }
-
- pipe_transfer_unmap(pipe, trans);
- pipe->transfer_destroy(pipe, trans);
- }
-
- return GL_TRUE;
-}
-
-
-/**
- * Do glReadPixels by getting rows from the framebuffer transfer with
- * get_tile(). Convert to requested format/type with Mesa image routines.
- * Image transfer ops are done in software too.
- */
-static void
-st_readpixels(struct gl_context *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- const struct gl_pixelstore_attrib *pack,
- GLvoid *dest)
-{
- struct st_context *st = st_context(ctx);
- struct pipe_context *pipe = st->pipe;
- GLfloat (*temp)[4];
- const GLbitfield transferOps = ctx->_ImageTransferState;
- GLsizei i, j;
- GLint yStep, dfStride;
- GLfloat *df;
- struct st_renderbuffer *strb;
- struct gl_pixelstore_attrib clippedPacking = *pack;
- struct pipe_transfer *trans;
- enum pipe_format pformat;
-
- assert(ctx->ReadBuffer->Width > 0);
-
- st_validate_state(st);
-
- /* Do all needed clipping here, so that we can forget about it later */
- if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
- /* The ReadPixels transfer is totally outside the window bounds */
- return;
- }
-
- st_flush_bitmap_cache(st);
-
- dest = _mesa_map_pbo_dest(ctx, &clippedPacking, dest);
- if (!dest)
- return;
-
- if (format == GL_STENCIL_INDEX ||
- format == GL_DEPTH_STENCIL) {
- st_read_stencil_pixels(ctx, x, y, width, height,
- format, type, pack, dest);
- return;
- }
- else if (format == GL_DEPTH_COMPONENT) {
- strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
- if (strb->Base.Wrapped) {
- strb = st_renderbuffer(strb->Base.Wrapped);
- }
- }
- else {
- /* Read color buffer */
- strb = st_get_color_read_renderbuffer(ctx);
- }
-
- if (!strb)
- return;
-
- /* try a fast-path readpixels before anything else */
- if (st_fast_readpixels(ctx, strb, x, y, width, height,
- format, type, pack, dest)) {
- /* success! */
- _mesa_unmap_pbo_dest(ctx, &clippedPacking);
- return;
- }
-
- /* allocate temp pixel row buffer */
- temp = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
- if (!temp) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
- return;
- }
-
- if (format == GL_RGBA && type == GL_FLOAT) {
- /* write tile(row) directly into user's buffer */
- df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
- height, format, type, 0, 0);
- dfStride = width * 4;
- }
- else {
- /* write tile(row) into temp row buffer */
- df = (GLfloat *) temp;
- dfStride = 0;
- }
-
- if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
- /* convert GL Y to Gallium Y */
- y = strb->Base.Height - y - height;
- }
-
- /* Create a read transfer from the renderbuffer's texture */
- trans = pipe_get_transfer(pipe, strb->texture,
- 0, 0,
- PIPE_TRANSFER_READ,
- x, y, width, height);
-
- /* determine bottom-to-top vs. top-to-bottom order */
- if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
- y = height - 1;
- yStep = -1;
- }
- else {
- y = 0;
- yStep = 1;
- }
-
- /* possibly convert sRGB format to linear RGB format */
- pformat = util_format_linear(trans->resource->format);
-
- if (ST_DEBUG & DEBUG_FALLBACK)
- debug_printf("%s: fallback processing\n", __FUNCTION__);
-
- /*
- * Copy pixels from pipe_transfer to user memory
- */
- {
- /* dest of first pixel in client memory */
- GLubyte *dst = _mesa_image_address2d(&clippedPacking, dest, width,
- height, format, type, 0, 0);
- /* dest row stride */
- const GLint dstStride = _mesa_image_row_stride(&clippedPacking, width,
- format, type);
-
- if (pformat == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
- pformat == PIPE_FORMAT_Z24X8_UNORM) {
- if (format == GL_DEPTH_COMPONENT) {
- for (i = 0; i < height; i++) {
- GLuint ztemp[MAX_WIDTH];
- GLfloat zfloat[MAX_WIDTH];
- const double scale = 1.0 / ((1 << 24) - 1);
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
- y += yStep;
- for (j = 0; j < width; j++) {
- zfloat[j] = (float) (scale * (ztemp[j] & 0xffffff));
- }
- _mesa_pack_depth_span(ctx, width, dst, type,
- zfloat, &clippedPacking);
- dst += dstStride;
- }
- }
- else {
- /* XXX: unreachable code -- should be before st_read_stencil_pixels */
- assert(format == GL_DEPTH_STENCIL_EXT);
- for (i = 0; i < height; i++) {
- GLuint *zshort = (GLuint *)dst;
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
- y += yStep;
- /* Reverse into 24/8 */
- for (j = 0; j < width; j++) {
- zshort[j] = (zshort[j] << 8) | (zshort[j] >> 24);
- }
- dst += dstStride;
- }
- }
- }
- else if (pformat == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
- pformat == PIPE_FORMAT_X8Z24_UNORM) {
- if (format == GL_DEPTH_COMPONENT) {
- for (i = 0; i < height; i++) {
- GLuint ztemp[MAX_WIDTH];
- GLfloat zfloat[MAX_WIDTH];
- const double scale = 1.0 / ((1 << 24) - 1);
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
- y += yStep;
- for (j = 0; j < width; j++) {
- zfloat[j] = (float) (scale * ((ztemp[j] >> 8) & 0xffffff));
- }
- _mesa_pack_depth_span(ctx, width, dst, type,
- zfloat, &clippedPacking);
- dst += dstStride;
- }
- }
- else {
- /* XXX: unreachable code -- should be before st_read_stencil_pixels */
- assert(format == GL_DEPTH_STENCIL_EXT);
- for (i = 0; i < height; i++) {
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
- y += yStep;
- dst += dstStride;
- }
- }
- }
- else if (pformat == PIPE_FORMAT_Z16_UNORM) {
- for (i = 0; i < height; i++) {
- GLushort ztemp[MAX_WIDTH];
- GLfloat zfloat[MAX_WIDTH];
- const double scale = 1.0 / 0xffff;
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
- y += yStep;
- for (j = 0; j < width; j++) {
- zfloat[j] = (float) (scale * ztemp[j]);
- }
- _mesa_pack_depth_span(ctx, width, dst, type,
- zfloat, &clippedPacking);
- dst += dstStride;
- }
- }
- else if (pformat == PIPE_FORMAT_Z32_UNORM) {
- for (i = 0; i < height; i++) {
- GLuint ztemp[MAX_WIDTH];
- GLfloat zfloat[MAX_WIDTH];
- const double scale = 1.0 / 0xffffffff;
- pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
- y += yStep;
- for (j = 0; j < width; j++) {
- zfloat[j] = (float) (scale * ztemp[j]);
- }
- _mesa_pack_depth_span(ctx, width, dst, type,
- zfloat, &clippedPacking);
- dst += dstStride;
- }
- }
- else {
- /* RGBA format */
- /* Do a row at a time to flip image data vertically */
- for (i = 0; i < height; i++) {
- pipe_get_tile_rgba_format(pipe, trans, 0, y, width, 1,
- pformat, df);
- y += yStep;
- df += dfStride;
- if (!dfStride) {
- _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
- &clippedPacking, transferOps);
- dst += dstStride;
- }
- }
- }
- }
-
- free(temp);
-
- pipe->transfer_destroy(pipe, trans);
-
- _mesa_unmap_pbo_dest(ctx, &clippedPacking);
-}
-
-
-void st_init_readpixels_functions(struct dd_function_table *functions)
-{
- functions->ReadPixels = st_readpixels;
-}
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+
+/**
+ * glReadPixels interface to pipe
+ *
+ * \author Brian Paul
+ */
+
+
+#include "main/imports.h"
+#include "main/bufferobj.h"
+#include "main/context.h"
+#include "main/image.h"
+#include "main/pack.h"
+#include "main/pbo.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "util/u_format.h"
+#include "util/u_inlines.h"
+#include "util/u_tile.h"
+
+#include "st_debug.h"
+#include "st_context.h"
+#include "st_atom.h"
+#include "st_cb_bitmap.h"
+#include "st_cb_readpixels.h"
+#include "st_cb_fbo.h"
+
+/**
+ * Special case for reading stencil buffer.
+ * For color/depth we use get_tile(). For stencil, map the stencil buffer.
+ */
+void
+st_read_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *packing,
+ GLvoid *pixels)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct pipe_context *pipe = st_context(ctx)->pipe;
+ struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
+ struct pipe_transfer *pt;
+ ubyte *stmap;
+ GLint j;
+
+ if (strb->Base.Wrapped) {
+ strb = st_renderbuffer(strb->Base.Wrapped);
+ }
+
+ if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+ y = ctx->DrawBuffer->Height - y - height;
+ }
+
+ /* Create a read transfer from the renderbuffer's texture */
+
+ pt = pipe_get_transfer(pipe, strb->texture,
+ 0, 0,
+ PIPE_TRANSFER_READ,
+ x, y, width, height);
+
+ /* map the stencil buffer */
+ stmap = pipe_transfer_map(pipe, pt);
+
+ /* width should never be > MAX_WIDTH since we did clipping earlier */
+ ASSERT(width <= MAX_WIDTH);
+
+ /* process image row by row */
+ for (j = 0; j < height; j++) {
+ GLvoid *dest;
+ GLstencil sValues[MAX_WIDTH];
+ GLfloat zValues[MAX_WIDTH];
+ GLint srcY;
+
+ if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+ srcY = height - j - 1;
+ }
+ else {
+ srcY = j;
+ }
+
+ /* get stencil (and Z) values */
+ switch (pt->resource->format) {
+ case PIPE_FORMAT_S8_USCALED:
+ {
+ const ubyte *src = stmap + srcY * pt->stride;
+ memcpy(sValues, src, width);
+ }
+ break;
+ case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
+ if (format == GL_DEPTH_STENCIL) {
+ const uint *src = (uint *) (stmap + srcY * pt->stride);
+ const GLfloat scale = 1.0f / (0xffffff);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ sValues[k] = src[k] >> 24;
+ zValues[k] = (src[k] & 0xffffff) * scale;
+ }
+ }
+ else {
+ const uint *src = (uint *) (stmap + srcY * pt->stride);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ sValues[k] = src[k] >> 24;
+ }
+ }
+ break;
+ case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
+ if (format == GL_DEPTH_STENCIL) {
+ const uint *src = (uint *) (stmap + srcY * pt->stride);
+ const GLfloat scale = 1.0f / (0xffffff);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ sValues[k] = src[k] & 0xff;
+ zValues[k] = (src[k] >> 8) * scale;
+ }
+ }
+ else {
+ const uint *src = (uint *) (stmap + srcY * pt->stride);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ sValues[k] = src[k] & 0xff;
+ }
+ }
+ break;
+ default:
+ assert(0);
+ }
+
+ /* store */
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ format, type, j, 0);
+ if (format == GL_DEPTH_STENCIL) {
+ _mesa_pack_depth_stencil_span(ctx, width, dest,
+ zValues, sValues, packing);
+ }
+ else {
+ _mesa_pack_stencil_span(ctx, width, type, dest, sValues, packing);
+ }
+ }
+
+ /* unmap the stencil buffer */
+ pipe_transfer_unmap(pipe, pt);
+ pipe->transfer_destroy(pipe, pt);
+}
+
+
+/**
+ * Return renderbuffer to use for reading color pixels for glRead/CopyPixel
+ * commands.
+ */
+struct st_renderbuffer *
+st_get_color_read_renderbuffer(struct gl_context *ctx)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct st_renderbuffer *strb =
+ st_renderbuffer(fb->_ColorReadBuffer);
+
+ return strb;
+}
+
+
+/**
+ * Try to do glReadPixels in a fast manner for common cases.
+ * \return GL_TRUE for success, GL_FALSE for failure
+ */
+static GLboolean
+st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *pack,
+ GLvoid *dest)
+{
+ enum combination {
+ A8R8G8B8_UNORM_TO_RGBA_UBYTE,
+ A8R8G8B8_UNORM_TO_RGB_UBYTE,
+ A8R8G8B8_UNORM_TO_BGRA_UINT
+ } combo;
+
+ if (ctx->_ImageTransferState)
+ return GL_FALSE;
+
+ if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
+ format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
+ combo = A8R8G8B8_UNORM_TO_RGBA_UBYTE;
+ }
+ else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
+ format == GL_RGB && type == GL_UNSIGNED_BYTE) {
+ combo = A8R8G8B8_UNORM_TO_RGB_UBYTE;
+ }
+ else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
+ format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {
+ combo = A8R8G8B8_UNORM_TO_BGRA_UINT;
+ }
+ else {
+ return GL_FALSE;
+ }
+
+ /*printf("st_fast_readpixels combo %d\n", (GLint) combo);*/
+
+ {
+ struct pipe_context *pipe = st_context(ctx)->pipe;
+ struct pipe_transfer *trans;
+ const GLubyte *map;
+ GLubyte *dst;
+ GLint row, col, dy, dstStride;
+
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ /* convert GL Y to Gallium Y */
+ y = strb->texture->height0 - y - height;
+ }
+
+ trans = pipe_get_transfer(pipe, strb->texture,
+ 0, 0,
+ PIPE_TRANSFER_READ,
+ x, y, width, height);
+ if (!trans) {
+ return GL_FALSE;
+ }
+
+ map = pipe_transfer_map(pipe, trans);
+ if (!map) {
+ pipe->transfer_destroy(pipe, trans);
+ return GL_FALSE;
+ }
+
+ /* We always write to the user/dest buffer from low addr to high addr
+ * but the read order depends on renderbuffer orientation
+ */
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ /* read source rows from bottom to top */
+ y = height - 1;
+ dy = -1;
+ }
+ else {
+ /* read source rows from top to bottom */
+ y = 0;
+ dy = 1;
+ }
+
+ dst = _mesa_image_address2d(pack, dest, width, height,
+ format, type, 0, 0);
+ dstStride = _mesa_image_row_stride(pack, width, format, type);
+
+ switch (combo) {
+ case A8R8G8B8_UNORM_TO_RGBA_UBYTE:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * trans->stride;
+ for (col = 0; col < width; col++) {
+ GLuint pixel = ((GLuint *) src)[col];
+ dst[col*4+0] = (pixel >> 16) & 0xff;
+ dst[col*4+1] = (pixel >> 8) & 0xff;
+ dst[col*4+2] = (pixel >> 0) & 0xff;
+ dst[col*4+3] = (pixel >> 24) & 0xff;
+ }
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ case A8R8G8B8_UNORM_TO_RGB_UBYTE:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * trans->stride;
+ for (col = 0; col < width; col++) {
+ GLuint pixel = ((GLuint *) src)[col];
+ dst[col*3+0] = (pixel >> 16) & 0xff;
+ dst[col*3+1] = (pixel >> 8) & 0xff;
+ dst[col*3+2] = (pixel >> 0) & 0xff;
+ }
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ case A8R8G8B8_UNORM_TO_BGRA_UINT:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * trans->stride;
+ memcpy(dst, src, 4 * width);
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ default:
+ ; /* nothing */
+ }
+
+ pipe_transfer_unmap(pipe, trans);
+ pipe->transfer_destroy(pipe, trans);
+ }
+
+ return GL_TRUE;
+}
+
+
+/**
+ * Do glReadPixels by getting rows from the framebuffer transfer with
+ * get_tile(). Convert to requested format/type with Mesa image routines.
+ * Image transfer ops are done in software too.
+ */
+static void
+st_readpixels(struct gl_context *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *pack,
+ GLvoid *dest)
+{
+ struct st_context *st = st_context(ctx);
+ struct pipe_context *pipe = st->pipe;
+ GLfloat (*temp)[4];
+ const GLbitfield transferOps = ctx->_ImageTransferState;
+ GLsizei i, j;
+ GLint yStep, dfStride;
+ GLfloat *df;
+ struct st_renderbuffer *strb;
+ struct gl_pixelstore_attrib clippedPacking = *pack;
+ struct pipe_transfer *trans;
+ enum pipe_format pformat;
+
+ assert(ctx->ReadBuffer->Width > 0);
+
+ st_validate_state(st);
+
+ /* Do all needed clipping here, so that we can forget about it later */
+ if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
+ /* The ReadPixels transfer is totally outside the window bounds */
+ return;
+ }
+
+ st_flush_bitmap_cache(st);
+
+ dest = _mesa_map_pbo_dest(ctx, &clippedPacking, dest);
+ if (!dest)
+ return;
+
+ if (format == GL_STENCIL_INDEX ||
+ format == GL_DEPTH_STENCIL) {
+ st_read_stencil_pixels(ctx, x, y, width, height,
+ format, type, pack, dest);
+ return;
+ }
+ else if (format == GL_DEPTH_COMPONENT) {
+ strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
+ if (strb->Base.Wrapped) {
+ strb = st_renderbuffer(strb->Base.Wrapped);
+ }
+ }
+ else {
+ /* Read color buffer */
+ strb = st_get_color_read_renderbuffer(ctx);
+ }
+
+ if (!strb)
+ return;
+
+ /* try a fast-path readpixels before anything else */
+ if (st_fast_readpixels(ctx, strb, x, y, width, height,
+ format, type, pack, dest)) {
+ /* success! */
+ _mesa_unmap_pbo_dest(ctx, &clippedPacking);
+ return;
+ }
+
+ /* allocate temp pixel row buffer */
+ temp = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
+ if (!temp) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
+ return;
+ }
+
+ if (format == GL_RGBA && type == GL_FLOAT) {
+ /* write tile(row) directly into user's buffer */
+ df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
+ height, format, type, 0, 0);
+ dfStride = width * 4;
+ }
+ else {
+ /* write tile(row) into temp row buffer */
+ df = (GLfloat *) temp;
+ dfStride = 0;
+ }
+
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ /* convert GL Y to Gallium Y */
+ y = strb->Base.Height - y - height;
+ }
+
+ /* Create a read transfer from the renderbuffer's texture */
+ trans = pipe_get_transfer(pipe, strb->texture,
+ 0, 0,
+ PIPE_TRANSFER_READ,
+ x, y, width, height);
+
+ /* determine bottom-to-top vs. top-to-bottom order */
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ y = height - 1;
+ yStep = -1;
+ }
+ else {
+ y = 0;
+ yStep = 1;
+ }
+
+ /* possibly convert sRGB format to linear RGB format */
+ pformat = util_format_linear(trans->resource->format);
+
+ if (ST_DEBUG & DEBUG_FALLBACK)
+ debug_printf("%s: fallback processing\n", __FUNCTION__);
+
+ /*
+ * Copy pixels from pipe_transfer to user memory
+ */
+ {
+ /* dest of first pixel in client memory */
+ GLubyte *dst = _mesa_image_address2d(&clippedPacking, dest, width,
+ height, format, type, 0, 0);
+ /* dest row stride */
+ const GLint dstStride = _mesa_image_row_stride(&clippedPacking, width,
+ format, type);
+
+ if (pformat == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
+ pformat == PIPE_FORMAT_Z24X8_UNORM) {
+ if (format == GL_DEPTH_COMPONENT) {
+ for (i = 0; i < height; i++) {
+ GLuint ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / ((1 << 24) - 1);
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * (ztemp[j] & 0xffffff));
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else {
+ /* XXX: unreachable code -- should be before st_read_stencil_pixels */
+ assert(format == GL_DEPTH_STENCIL_EXT);
+ for (i = 0; i < height; i++) {
+ GLuint *zshort = (GLuint *)dst;
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
+ y += yStep;
+ /* Reverse into 24/8 */
+ for (j = 0; j < width; j++) {
+ zshort[j] = (zshort[j] << 8) | (zshort[j] >> 24);
+ }
+ dst += dstStride;
+ }
+ }
+ }
+ else if (pformat == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
+ pformat == PIPE_FORMAT_X8Z24_UNORM) {
+ if (format == GL_DEPTH_COMPONENT) {
+ for (i = 0; i < height; i++) {
+ GLuint ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / ((1 << 24) - 1);
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * ((ztemp[j] >> 8) & 0xffffff));
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else {
+ /* XXX: unreachable code -- should be before st_read_stencil_pixels */
+ assert(format == GL_DEPTH_STENCIL_EXT);
+ for (i = 0; i < height; i++) {
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
+ y += yStep;
+ dst += dstStride;
+ }
+ }
+ }
+ else if (pformat == PIPE_FORMAT_Z16_UNORM) {
+ for (i = 0; i < height; i++) {
+ GLushort ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / 0xffff;
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * ztemp[j]);
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else if (pformat == PIPE_FORMAT_Z32_UNORM) {
+ for (i = 0; i < height; i++) {
+ GLuint ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / 0xffffffff;
+ pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * ztemp[j]);
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else {
+ /* RGBA format */
+ /* Do a row at a time to flip image data vertically */
+ for (i = 0; i < height; i++) {
+ pipe_get_tile_rgba_format(pipe, trans, 0, y, width, 1,
+ pformat, df);
+ y += yStep;
+ df += dfStride;
+ if (!dfStride) {
+ _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
+ &clippedPacking, transferOps);
+ dst += dstStride;
+ }
+ }
+ }
+ }
+
+ free(temp);
+
+ pipe->transfer_destroy(pipe, trans);
+
+ _mesa_unmap_pbo_dest(ctx, &clippedPacking);
+}
+
+
+void st_init_readpixels_functions(struct dd_function_table *functions)
+{
+ functions->ReadPixels = st_readpixels;
+}