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/**************************************************************************
*
* 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/context.h"
#include "main/image.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "st_context.h"
#include "st_cb_readpixels.h"
#include "st_cb_fbo.h"
#include "st_format.h"
#include "st_public.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(GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height, GLenum type,
const struct gl_pixelstore_attrib *packing,
GLvoid *pixels)
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = st->pipe;
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
struct pipe_surface *ps = strb->surface;
ubyte *stmap;
GLint j;
/* map the stencil buffer */
stmap = pipe->region_map(pipe, ps->region);
/* 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++, y++) {
GLvoid *dest;
GLstencil values[MAX_WIDTH];
GLint srcY;
if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
srcY = ctx->DrawBuffer->Height - y - 1;
}
else {
srcY = y;
}
/* get stencil values */
switch (ps->format) {
case PIPE_FORMAT_U_S8:
{
const ubyte *src = stmap + srcY * ps->region->pitch + x;
memcpy(values, src, width);
}
break;
case PIPE_FORMAT_S8_Z24:
{
const uint *src = (uint *) stmap + srcY * ps->region->pitch + x;
GLint k;
for (k = 0; k < width; k++) {
values[k] = src[k] >> 24;
}
}
break;
case PIPE_FORMAT_Z24_S8:
{
const uint *src = (uint *) stmap + srcY * ps->region->pitch + x;
GLint k;
for (k = 0; k < width; k++) {
values[k] = src[k] & 0xff;
}
}
break;
default:
assert(0);
}
/* store */
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_STENCIL_INDEX, type, j, 0);
_mesa_pack_stencil_span(ctx, width, type, dest, values, packing);
}
/* unmap the stencil buffer */
pipe->region_unmap(pipe, ps->region);
}
/**
* Do glReadPixels by getting rows from the framebuffer surface with
* get_tile(). Convert to requested format/type with Mesa image routines.
* Image transfer ops are done in software too.
*/
static void
st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *pack,
GLvoid *dest)
{
struct pipe_context *pipe = ctx->st->pipe;
GLfloat temp[MAX_WIDTH][4];
const GLbitfield transferOps = ctx->_ImageTransferState;
GLint i, yStep, dfStride;
GLfloat *df;
struct st_renderbuffer *strb;
struct gl_pixelstore_attrib clippedPacking = *pack;
/* XXX convolution not done yet */
assert((transferOps & IMAGE_CONVOLUTION_BIT) == 0);
/* 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 region is totally outside the window bounds */
return;
}
/* make sure rendering has completed */
pipe->flush(pipe, 0x0);
if (pack->BufferObj && pack->BufferObj->Name) {
/* reading into a PBO */
}
else {
/* reading into user memory/buffer */
}
if (format == GL_STENCIL_INDEX) {
st_read_stencil_pixels(ctx, x, y, width, height, type, pack, dest);
return;
}
else if (format == GL_DEPTH_COMPONENT) {
strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
}
else {
strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
}
if (!strb)
return;
pipe->region_map(pipe, strb->surface->region);
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;
}
#if 0
else if (format == GL_DEPTH_COMPONENT && 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;
}
#endif
else {
/* write tile(row) into temp row buffer */
df = (GLfloat *) temp;
dfStride = 0;
}
/* determine bottom-to-top vs. top-to-bottom order */
if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
y = strb->Base.Height - 1 - y;
yStep = -1;
}
else {
yStep = 1;
}
/* Do a row at a time to flip image data vertically */
for (i = 0; i < height; i++) {
pipe->get_tile_rgba(pipe, strb->surface, x, y, width, 1, df);
y += yStep;
df += dfStride;
if (!dfStride) {
/* convert GLfloat to user's format/type */
GLvoid *dst = _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, i, 0);
if (format == GL_DEPTH_COMPONENT) {
_mesa_pack_depth_span(ctx, width, dst, type,
(GLfloat *) temp, &clippedPacking);
}
else {
_mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
&clippedPacking, transferOps);
}
}
}
pipe->region_unmap(pipe, strb->surface->region);
}
void st_init_readpixels_functions(struct dd_function_table *functions)
{
functions->ReadPixels = st_readpixels;
}
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