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

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/*
* Mesa 3-D graphics library
* Version: 7.7
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (c) 2009 VMware, Inc.
*
* 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.
*/
/**
* Code for glGetTexImage() and glGetCompressedTexImage().
*/
#include <precomp.h>
/**
* Can the given type represent negative values?
*/
static inline GLboolean
type_needs_clamping(GLenum type)
{
switch (type) {
case GL_BYTE:
case GL_SHORT:
case GL_INT:
case GL_FLOAT:
case GL_UNSIGNED_INT_10F_11F_11F_REV:
case GL_UNSIGNED_INT_5_9_9_9_REV:
return GL_FALSE;
default:
return GL_TRUE;
}
}
/**
* glGetTexImage for depth/Z pixels.
*/
static void
get_tex_depth(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLint width = texImage->Width;
const GLint height = texImage->Height;
const GLint depth = texImage->Depth;
GLint img, row;
GLfloat *depthRow = (GLfloat *) malloc(width * sizeof(GLfloat));
if (!depthRow) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
return;
}
for (img = 0; img < depth; img++) {
GLubyte *srcMap;
GLint srcRowStride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, img,
0, 0, width, height, GL_MAP_READ_BIT,
&srcMap, &srcRowStride);
if (srcMap) {
for (row = 0; row < height; row++) {
void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
width, height, format, type,
img, row, 0);
const GLubyte *src = srcMap + row * srcRowStride;
_mesa_unpack_float_z_row(texImage->TexFormat, width, src, depthRow);
_mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
}
ctx->Driver.UnmapTextureImage(ctx, texImage, img);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
break;
}
}
free(depthRow);
}
/**
* glGetTexImage for YCbCr pixels.
*/
static void
get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLint width = texImage->Width;
const GLint height = texImage->Height;
const GLint depth = texImage->Depth;
GLint img, row;
for (img = 0; img < depth; img++) {
GLubyte *srcMap;
GLint rowstride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, img,
0, 0, width, height, GL_MAP_READ_BIT,
&srcMap, &rowstride);
if (srcMap) {
for (row = 0; row < height; row++) {
const GLubyte *src = srcMap + row * rowstride;
void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
width, height, format, type,
img, row, 0);
memcpy(dest, src, width * sizeof(GLushort));
/* check for byte swapping */
if ((texImage->TexFormat == MESA_FORMAT_YCBCR
&& type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
(texImage->TexFormat == MESA_FORMAT_YCBCR_REV
&& type == GL_UNSIGNED_SHORT_8_8_MESA)) {
if (!ctx->Pack.SwapBytes)
_mesa_swap2((GLushort *) dest, width);
}
else if (ctx->Pack.SwapBytes) {
_mesa_swap2((GLushort *) dest, width);
}
}
ctx->Driver.UnmapTextureImage(ctx, texImage, img);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
break;
}
}
}
/**
* Get an uncompressed color texture image.
*/
static void
get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage,
GLbitfield transferOps)
{
const gl_format texFormat = texImage->TexFormat;
const GLuint width = texImage->Width;
const GLenum destBaseFormat = _mesa_base_tex_format(ctx, format);
GLenum rebaseFormat = GL_NONE;
GLuint height = texImage->Height;
GLuint depth = texImage->Depth;
GLuint img, row;
GLfloat (*rgba)[4];
GLuint (*rgba_uint)[4];
GLboolean is_integer = _mesa_is_format_integer_color(texImage->TexFormat);
/* Allocate buffer for one row of texels */
rgba = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
rgba_uint = (GLuint (*)[4]) rgba;
if (!rgba) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
return;
}
if (texImage->_BaseFormat == GL_LUMINANCE ||
texImage->_BaseFormat == GL_INTENSITY ||
texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
/* If a luminance (or intensity) texture is read back as RGB(A), the
* returned value should be (L,0,0,1), not (L,L,L,1). Set rebaseFormat
* here to get G=B=0.
*/
rebaseFormat = texImage->_BaseFormat;
}
else if ((texImage->_BaseFormat == GL_RGBA ||
texImage->_BaseFormat == GL_RGB) &&
(destBaseFormat == GL_LUMINANCE ||
destBaseFormat == GL_LUMINANCE_ALPHA ||
destBaseFormat == GL_LUMINANCE_INTEGER_EXT ||
destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) {
/* If we're reading back an RGB(A) texture as luminance then we need
* to return L=tex(R). Note, that's different from glReadPixels which
* returns L=R+G+B.
*/
rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */
}
for (img = 0; img < depth; img++) {
GLubyte *srcMap;
GLint rowstride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, img,
0, 0, width, height, GL_MAP_READ_BIT,
&srcMap, &rowstride);
if (srcMap) {
for (row = 0; row < height; row++) {
const GLubyte *src = srcMap + row * rowstride;
void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
width, height, format, type,
img, row, 0);
if (is_integer) {
_mesa_unpack_uint_rgba_row(texFormat, width, src, rgba_uint);
if (rebaseFormat)
_mesa_rebase_rgba_uint(width, rgba_uint, rebaseFormat);
_mesa_pack_rgba_span_int(ctx, width, rgba_uint,
format, type, dest);
} else {
_mesa_unpack_rgba_row(texFormat, width, src, rgba);
if (rebaseFormat)
_mesa_rebase_rgba_float(width, rgba, rebaseFormat);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
format, type, dest,
&ctx->Pack, transferOps);
}
}
/* Unmap the src texture buffer */
ctx->Driver.UnmapTextureImage(ctx, texImage, img);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
break;
}
}
free(rgba);
}
/**
* glGetTexImage for color formats (RGBA, RGB, alpha, LA, etc).
* Compressed textures are handled here as well.
*/
static void
get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
GLbitfield transferOps = 0x0;
/* In general, clamping does not apply to glGetTexImage, except when
* the returned type of the image can't hold negative values.
*/
if (type_needs_clamping(type)) {
/* the returned image type can't have negative values */
if (dataType == GL_FLOAT ||
dataType == GL_SIGNED_NORMALIZED ||
format == GL_LUMINANCE ||
format == GL_LUMINANCE_ALPHA) {
transferOps |= IMAGE_CLAMP_BIT;
}
}
/* This applies to RGB, RGBA textures. if the format is either LUMINANCE
* or LUMINANCE ALPHA, luminance (L) is computed as L=R+G+B .we need to
* clamp the sum to [0,1].
*/
else if ((format == GL_LUMINANCE ||
format == GL_LUMINANCE_ALPHA) &&
dataType == GL_UNSIGNED_NORMALIZED) {
transferOps |= IMAGE_CLAMP_BIT;
}
get_tex_rgba_uncompressed(ctx, dimensions, format, type,
pixels, texImage, transferOps);
}
/**
* Try to do glGetTexImage() with simple memcpy().
* \return GL_TRUE if done, GL_FALSE otherwise
*/
static GLboolean
get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type,
GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum target = texImage->TexObject->Target;
GLboolean memCopy = GL_FALSE;
/*
* Check if the src/dst formats are compatible.
* Also note that GL's pixel transfer ops don't apply to glGetTexImage()
* so we don't have to worry about those.
* XXX more format combinations could be supported here.
*/
if (target == GL_TEXTURE_1D ||
target == GL_TEXTURE_2D ||
_mesa_is_cube_face(target)) {
if ((texImage->TexFormat == MESA_FORMAT_ARGB8888) &&
format == GL_BGRA &&
(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) &&
!ctx->Pack.SwapBytes &&
_mesa_little_endian()) {
memCopy = GL_TRUE;
}
else if ((texImage->TexFormat == MESA_FORMAT_AL88) &&
format == GL_LUMINANCE_ALPHA &&
type == GL_UNSIGNED_BYTE &&
!ctx->Pack.SwapBytes &&
_mesa_little_endian()) {
memCopy = GL_TRUE;
}
else if ((texImage->TexFormat == MESA_FORMAT_L8) &&
format == GL_LUMINANCE &&
type == GL_UNSIGNED_BYTE) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_L16 &&
format == GL_LUMINANCE &&
type == GL_UNSIGNED_SHORT) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_A8 &&
format == GL_ALPHA &&
type == GL_UNSIGNED_BYTE) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_A16 &&
format == GL_ALPHA &&
type == GL_UNSIGNED_SHORT) {
memCopy = GL_TRUE;
}
}
if (memCopy) {
const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
const GLuint bytesPerRow = texImage->Width * bpp;
GLubyte *dst =
_mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,
texImage->Height, format, type, 0, 0);
const GLint dstRowStride =
_mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);
GLubyte *src;
GLint srcRowStride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, 0,
0, 0, texImage->Width, texImage->Height,
GL_MAP_READ_BIT, &src, &srcRowStride);
if (src) {
if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
memcpy(dst, src, bytesPerRow * texImage->Height);
}
else {
GLuint row;
for (row = 0; row < texImage->Height; row++) {
memcpy(dst, src, bytesPerRow);
dst += dstRowStride;
src += srcRowStride;
}
}
/* unmap src texture buffer */
ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
}
}
return memCopy;
}
/**
* This is the software fallback for Driver.GetTexImage().
* All error checking will have been done before this routine is called.
* We'll call ctx->Driver.MapTextureImage() to access the data, then
* unmap with ctx->Driver.UnmapTextureImage().
*/
void
_mesa_get_teximage(struct gl_context *ctx,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
GLuint dimensions;
switch (texImage->TexObject->Target) {
case GL_TEXTURE_1D:
dimensions = 1;
break;
default:
dimensions = 2;
}
if (get_tex_memcpy(ctx, format, type, pixels, texImage)) {
/* all done */
}
else if (format == GL_DEPTH_COMPONENT) {
get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_YCBCR_MESA) {
get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
}
else {
get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
}
}
/**
* Do error checking for a glGetTexImage() call.
* \return GL_TRUE if any error, GL_FALSE if no errors.
*/
static GLboolean
getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
GLenum format, GLenum type, GLvoid *pixels )
{
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
GLenum baseFormat, err;
if (maxLevels == 0) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target=0x%x)", target);
return GL_TRUE;
}
if (level < 0 || level >= maxLevels) {
_mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
return GL_TRUE;
}
if (_mesa_sizeof_packed_type(type) <= 0) {
_mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );
return GL_TRUE;
}
if (_mesa_components_in_format(format) <= 0 ||
format == GL_STENCIL_INDEX ||
format == GL_COLOR_INDEX) {
_mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
return GL_TRUE;
}
if (_mesa_is_depth_format(format)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
return GL_TRUE;
}
if (!ctx->Extensions.MESA_ycbcr_texture && _mesa_is_ycbcr_format(format)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
return GL_TRUE;
}
err = _mesa_error_check_format_and_type(ctx, format, type);
if (err != GL_NO_ERROR) {
_mesa_error(ctx, err, "glGetTexImage(format/type)");
return GL_TRUE;
}
texObj = _mesa_select_tex_object(ctx, target);
if (!texObj || _mesa_is_proxy_texture(target)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");
return GL_TRUE;
}
texImage = _mesa_select_tex_image(ctx, texObj, target, level);
if (!texImage) {
/* non-existant texture image */
return GL_TRUE;
}
baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
/* Make sure the requested image format is compatible with the
* texture's format.
*/
if (_mesa_is_color_format(format)
&& !_mesa_is_color_format(baseFormat)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
return GL_TRUE;
}
else if (_mesa_is_depth_format(format)
&& !_mesa_is_depth_format(baseFormat)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
return GL_TRUE;
}
else if (_mesa_is_ycbcr_format(format)
&& !_mesa_is_ycbcr_format(baseFormat)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
return GL_TRUE;
}
return GL_FALSE;
}
/**
* Get texture image. Called by glGetTexImage.
*
* \param target texture target.
* \param level image level.
* \param format pixel data format for returned image.
* \param type pixel data type for returned image.
* \param bufSize size of the pixels data buffer.
* \param pixels returned pixel data.
*/
void GLAPIENTRY
_mesa_GetTexImage( GLenum target, GLint level, GLenum format,
GLenum type, GLvoid *pixels )
{
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (getteximage_error_check(ctx, target, level, format, type, pixels)) {
return;
}
if (!pixels) {
/* not an error, do nothing */
return;
}
texObj = _mesa_select_tex_object(ctx, target);
texImage = _mesa_select_tex_image(ctx, texObj, target, level);
if (_mesa_is_zero_size_texture(texImage))
return;
if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
_mesa_debug(ctx, "glGetTexImage(tex %u) format = %s, w=%d, h=%d,"
" dstFmt=0x%x, dstType=0x%x\n",
texObj->Name,
_mesa_get_format_name(texImage->TexFormat),
texImage->Width, texImage->Height,
format, type);
}
_mesa_lock_texture(ctx, texObj);
{
ctx->Driver.GetTexImage(ctx, format, type, pixels, texImage);
}
_mesa_unlock_texture(ctx, texObj);
}
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