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reactos/dll/opengl/mesa/main/readpix.c

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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2008 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
* BRIAN PAUL 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 <precomp.h>
/**
* Tries to implement glReadPixels() of GL_DEPTH_COMPONENT using memcpy of the
* mapping.
*/
static GLboolean
fast_read_depth_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
GLubyte *map, *dst;
int stride, dstStride, j;
if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0)
return GL_FALSE;
if (packing->SwapBytes)
return GL_FALSE;
if (_mesa_get_format_datatype(rb->Format) != GL_UNSIGNED_NORMALIZED)
return GL_FALSE;
if (!((type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16) ||
type == GL_UNSIGNED_INT))
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return GL_TRUE; /* don't bother trying the slow path */
}
dstStride = _mesa_image_row_stride(packing, width, GL_DEPTH_COMPONENT, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, 0, 0);
for (j = 0; j < height; j++) {
if (type == GL_UNSIGNED_INT) {
_mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst);
} else {
ASSERT(type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16);
memcpy(dst, map, width * 2);
}
map += stride;
dst += dstStride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
return GL_TRUE;
}
/**
* Read pixels for format=GL_DEPTH_COMPONENT.
*/
static void
read_depth_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
GLint j;
GLubyte *dst, *map;
int dstStride, stride;
if (!rb)
return;
/* clipping should have been done already */
ASSERT(x >= 0);
ASSERT(y >= 0);
ASSERT(x + width <= (GLint) rb->Width);
ASSERT(y + height <= (GLint) rb->Height);
/* width should never be > MAX_WIDTH since we did clipping earlier */
ASSERT(width <= MAX_WIDTH);
if (fast_read_depth_pixels(ctx, x, y, width, height, type, pixels, packing))
return;
dstStride = _mesa_image_row_stride(packing, width, GL_DEPTH_COMPONENT, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, 0, 0);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
/* General case (slower) */
for (j = 0; j < height; j++, y++) {
GLfloat depthValues[MAX_WIDTH];
_mesa_unpack_float_z_row(rb->Format, width, map, depthValues);
_mesa_pack_depth_span(ctx, width, dst, type, depthValues, packing);
dst += dstStride;
map += stride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
/**
* Read pixels for format=GL_STENCIL_INDEX.
*/
static void
read_stencil_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLint j;
GLubyte *map;
GLint stride;
if (!rb)
return;
/* width should never be > MAX_WIDTH since we did clipping earlier */
ASSERT(width <= MAX_WIDTH);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
/* process image row by row */
for (j = 0; j < height; j++) {
GLvoid *dest;
GLubyte stencil[MAX_WIDTH];
_mesa_unpack_ubyte_stencil_row(rb->Format, width, map, stencil);
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_STENCIL_INDEX, type, j, 0);
_mesa_pack_stencil_span(ctx, width, type, dest, stencil, packing);
map += stride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
/**
* Try to do glReadPixels of RGBA data using a simple memcpy or swizzle.
* \return GL_TRUE if successful, GL_FALSE otherwise (use the slow path)
*/
static GLboolean
fast_read_rgba_pixels_memcpy( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid *pixels,
const struct gl_pixelstore_attrib *packing,
GLbitfield transferOps )
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
GLubyte *dst, *map;
int dstStride, stride, j, texelBytes;
GLboolean swizzle_rb = GL_FALSE, copy_xrgb = GL_FALSE;
/* XXX we could check for other swizzle/special cases here as needed */
if (rb->Format == MESA_FORMAT_RGBA8888_REV &&
format == GL_BGRA &&
type == GL_UNSIGNED_INT_8_8_8_8_REV) {
swizzle_rb = GL_TRUE;
}
else if (rb->Format == MESA_FORMAT_XRGB8888 &&
format == GL_BGRA &&
type == GL_UNSIGNED_INT_8_8_8_8_REV) {
copy_xrgb = GL_TRUE;
}
else if (!_mesa_format_matches_format_and_type(rb->Format, format, type))
return GL_FALSE;
/* check for things we can't handle here */
if (packing->SwapBytes) {
return GL_FALSE;
}
/* If the format is unsigned normalized then we can ignore clamping
* because the values are already in the range [0,1] so it won't
* have any effect anyway.
*/
if (_mesa_get_format_datatype(rb->Format) == GL_UNSIGNED_NORMALIZED)
transferOps &= ~IMAGE_CLAMP_BIT;
if (transferOps)
return GL_FALSE;
dstStride = _mesa_image_row_stride(packing, width, format, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return GL_TRUE; /* don't bother trying the slow path */
}
texelBytes = _mesa_get_format_bytes(rb->Format);
if (swizzle_rb) {
/* swap R/B */
for (j = 0; j < height; j++) {
int i;
for (i = 0; i < width; i++) {
GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map;
GLuint pixel = map4[i];
dst4[i] = (pixel & 0xff00ff00)
| ((pixel & 0x00ff0000) >> 16)
| ((pixel & 0x000000ff) << 16);
}
dst += dstStride;
map += stride;
}
} else if (copy_xrgb) {
/* convert xrgb -> argb */
for (j = 0; j < height; j++) {
GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map;
int i;
for (i = 0; i < width; i++) {
dst4[i] = map4[i] | 0xff000000; /* set A=0xff */
}
dst += dstStride;
map += stride;
}
} else {
/* just memcpy */
for (j = 0; j < height; j++) {
memcpy(dst, map, width * texelBytes);
dst += dstStride;
map += stride;
}
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
return GL_TRUE;
}
static void
slow_read_rgba_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid *pixels,
const struct gl_pixelstore_attrib *packing,
GLbitfield transferOps )
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
const gl_format rbFormat = rb->Format;
void *rgba;
GLubyte *dst, *map;
int dstStride, stride, j;
dstStride = _mesa_image_row_stride(packing, width, format, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
rgba = malloc(width * MAX_PIXEL_BYTES);
if (!rgba)
goto done;
for (j = 0; j < height; j++) {
if (_mesa_is_integer_format(format)) {
_mesa_unpack_uint_rgba_row(rbFormat, width, map, (GLuint (*)[4]) rgba);
_mesa_rebase_rgba_uint(width, (GLuint (*)[4]) rgba,
rb->_BaseFormat);
_mesa_pack_rgba_span_int(ctx, width, (GLuint (*)[4]) rgba, format,
type, dst);
} else {
_mesa_unpack_rgba_row(rbFormat, width, map, (GLfloat (*)[4]) rgba);
_mesa_rebase_rgba_float(width, (GLfloat (*)[4]) rgba,
rb->_BaseFormat);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format,
type, dst, packing, transferOps);
}
dst += dstStride;
map += stride;
}
free(rgba);
done:
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
/*
* Read R, G, B, A, RGB, L, or LA pixels.
*/
static void
read_rgba_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
GLbitfield transferOps = ctx->_ImageTransferState;
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
if (!rb)
return;
if (!_mesa_is_integer_format(format)) {
transferOps |= IMAGE_CLAMP_BIT;
}
/* Try the optimized paths first. */
if (fast_read_rgba_pixels_memcpy(ctx, x, y, width, height,
format, type, pixels, packing,
transferOps)) {
return;
}
slow_read_rgba_pixels(ctx, x, y, width, height,
format, type, pixels, packing, transferOps);
}
/**
* Software fallback routine for ctx->Driver.ReadPixels().
* By time we get here, all error checking will have been done.
*/
void
_mesa_readpixels(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_pixelstore_attrib clippedPacking = *packing;
if (ctx->NewState)
_mesa_update_state(ctx);
/* Do all needed clipping here, so that we can forget about it later */
if (_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
if (pixels) {
switch (format) {
case GL_STENCIL_INDEX:
read_stencil_pixels(ctx, x, y, width, height, type, pixels,
&clippedPacking);
break;
case GL_DEPTH_COMPONENT:
read_depth_pixels(ctx, x, y, width, height, type, pixels,
&clippedPacking);
break;
default:
/* all other formats should be color formats */
read_rgba_pixels(ctx, x, y, width, height, format, type, pixels,
&clippedPacking);
}
}
}
}
/**
* Do error checking of the format/type parameters to glReadPixels and
* glDrawPixels.
* \param drawing if GL_TRUE do checking for DrawPixels, else do checking
* for ReadPixels.
* \return GL_TRUE if error detected, GL_FALSE if no errors
*/
GLboolean
_mesa_error_check_format_type(struct gl_context *ctx, GLenum format,
GLenum type, GLboolean drawing)
{
const char *readDraw = drawing ? "Draw" : "Read";
const GLboolean reading = !drawing;
GLenum err;
/* state validation should have already been done */
ASSERT(ctx->NewState == 0x0);
/* basic combinations test */
err = _mesa_error_check_format_and_type(ctx, format, type);
if (err != GL_NO_ERROR) {
_mesa_error(ctx, err, "gl%sPixels(format or type)", readDraw);
return GL_TRUE;
}
/* additional checks */
switch (format) {
case GL_RG:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_RGB:
case GL_BGR:
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
case GL_RED_INTEGER_EXT:
case GL_GREEN_INTEGER_EXT:
case GL_BLUE_INTEGER_EXT:
case GL_ALPHA_INTEGER_EXT:
case GL_RGB_INTEGER_EXT:
case GL_RGBA_INTEGER_EXT:
case GL_BGR_INTEGER_EXT:
case GL_BGRA_INTEGER_EXT:
case GL_LUMINANCE_INTEGER_EXT:
case GL_LUMINANCE_ALPHA_INTEGER_EXT:
if (!drawing) {
/* reading */
if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(no color buffer)");
return GL_TRUE;
}
}
break;
case GL_COLOR_INDEX:
if (drawing) {
if (ctx->PixelMaps.ItoR.Size == 0 ||
ctx->PixelMaps.ItoG.Size == 0 ||
ctx->PixelMaps.ItoB.Size == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glDrawPixels(drawing color index pixels into RGB buffer)");
return GL_TRUE;
}
}
else {
/* reading */
if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(no color buffer)");
return GL_TRUE;
}
/* We no longer support CI-mode color buffers so trying to read
* GL_COLOR_INDEX pixels is always an error.
*/
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(color buffer is RGB)");
return GL_TRUE;
}
break;
case GL_STENCIL_INDEX:
if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
(reading && !_mesa_source_buffer_exists(ctx, format))) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"gl%sPixels(no stencil buffer)", readDraw);
return GL_TRUE;
}
break;
case GL_DEPTH_COMPONENT:
if ((drawing && !_mesa_dest_buffer_exists(ctx, format))) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"gl%sPixels(no depth buffer)", readDraw);
return GL_TRUE;
}
break;
default:
/* this should have been caught in _mesa_error_check_format_type() */
_mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw);
return GL_TRUE;
}
/* no errors */
return GL_FALSE;
}
void GLAPIENTRY
_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid *pixels )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
FLUSH_CURRENT(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadPixels(%d, %d, %s, %s, %p)\n",
width, height,
_mesa_lookup_enum_by_nr(format),
_mesa_lookup_enum_by_nr(type),
pixels);
if (width < 0 || height < 0) {
_mesa_error( ctx, GL_INVALID_VALUE,
"glReadPixels(width=%d height=%d)", width, height );
return;
}
if (ctx->NewState)
_mesa_update_state(ctx);
if (_mesa_error_check_format_type(ctx, format, type, GL_FALSE)) {
/* found an error */
return;
}
/* Check that the destination format and source buffer are both
* integer-valued or both non-integer-valued.
*/
if (ctx->Extensions.EXT_texture_integer && _mesa_is_color_format(format)) {
const struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
const GLboolean srcInteger = _mesa_is_format_integer_color(rb->Format);
const GLboolean dstInteger = _mesa_is_integer_format(format);
if (dstInteger != srcInteger) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(integer / non-integer format mismatch");
return;
}
}
if (!_mesa_source_buffer_exists(ctx, format)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)");
return;
}
if (width == 0 || height == 0)
return; /* nothing to do */
ctx->Driver.ReadPixels(ctx, x, y, width, height,
format, type, &ctx->Pack, pixels);
}
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