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318c265160ed33a2d9f7d664e1b247cbbc38203f
third_party_mesa3d/src/mesa/main/readpix.c
Fritz Koenig 318c265160 mesa: GL_MESA_framebuffer_flip_y extension [v4] 
Adds an extension to glFramebufferParameteri
that will specify if the framebuffer is vertically
flipped. Historically system framebuffers are
vertically flipped and user framebuffers are not.
Checking to see the state was done by looking at
the name field.  This adds an explicit field.

v2:
  * updated spec language [for chadv]
  * correctly specifying ES 3.1 [for chadv]
  * refactor access to rb->Name [for jason]
  * handle GetFramebufferParameteriv [for chadv]
v3:
  * correct _mesa_GetMultisamplefv [for kusmabite]
v4:
  * update spec language [for chadv]
  * s/GLboolean/bool/g [for chadv]
  * s/InvertedY/FlipY/g [for chadv]
  * s/inverted_y/flip_y/g [for chadv]
  * assert changes [for chadv]

Reviewed-by: Chad Versace <chadversary@chromium.org>
2018-07-27 12:32:25 -07:00

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/*
* Mesa 3-D graphics library
*
* 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
* 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 "glheader.h"
#include "imports.h"
#include "blend.h"
#include "bufferobj.h"
#include "context.h"
#include "enums.h"
#include "readpix.h"
#include "framebuffer.h"
#include "formats.h"
#include "format_unpack.h"
#include "image.h"
#include "mtypes.h"
#include "pack.h"
#include "pbo.h"
#include "state.h"
#include "glformats.h"
#include "fbobject.h"
#include "format_utils.h"
#include "pixeltransfer.h"
/**
* Return true if the conversion L=R+G+B is needed.
*/
GLboolean
_mesa_need_rgb_to_luminance_conversion(GLenum srcBaseFormat,
GLenum dstBaseFormat)
{
return (srcBaseFormat == GL_RG ||
srcBaseFormat == GL_RGB ||
srcBaseFormat == GL_RGBA) &&
(dstBaseFormat == GL_LUMINANCE ||
dstBaseFormat == GL_LUMINANCE_ALPHA);
}
/**
* Return true if the conversion L,I to RGB conversion is needed.
*/
GLboolean
_mesa_need_luminance_to_rgb_conversion(GLenum srcBaseFormat,
GLenum dstBaseFormat)
{
return (srcBaseFormat == GL_LUMINANCE ||
srcBaseFormat == GL_LUMINANCE_ALPHA ||
srcBaseFormat == GL_INTENSITY) &&
(dstBaseFormat == GL_GREEN ||
dstBaseFormat == GL_BLUE ||
dstBaseFormat == GL_RG ||
dstBaseFormat == GL_RGB ||
dstBaseFormat == GL_BGR ||
dstBaseFormat == GL_RGBA ||
dstBaseFormat == GL_BGRA);
}
/**
* Return transfer op flags for this ReadPixels operation.
*/
GLbitfield
_mesa_get_readpixels_transfer_ops(const struct gl_context *ctx,
mesa_format texFormat,
GLenum format, GLenum type,
GLboolean uses_blit)
{
GLbitfield transferOps = ctx->_ImageTransferState;
GLenum srcBaseFormat = _mesa_get_format_base_format(texFormat);
GLenum dstBaseFormat = _mesa_unpack_format_to_base_format(format);
if (format == GL_DEPTH_COMPONENT ||
format == GL_DEPTH_STENCIL ||
format == GL_STENCIL_INDEX) {
return 0;
}
/* Pixel transfer ops (scale, bias, table lookup) do not apply
* to integer formats.
*/
if (_mesa_is_enum_format_integer(format)) {
return 0;
}
if (uses_blit) {
/* For blit-based ReadPixels packing, the clamping is done automatically
* unless the type is float. */
if (_mesa_get_clamp_read_color(ctx, ctx->ReadBuffer) &&
(type == GL_FLOAT || type == GL_HALF_FLOAT ||
type == GL_UNSIGNED_INT_10F_11F_11F_REV)) {
transferOps |= IMAGE_CLAMP_BIT;
}
}
else {
/* For CPU-based ReadPixels packing, the clamping must always be done
* for non-float types, */
if (_mesa_get_clamp_read_color(ctx, ctx->ReadBuffer) ||
(type != GL_FLOAT && type != GL_HALF_FLOAT &&
type != GL_UNSIGNED_INT_10F_11F_11F_REV)) {
transferOps |= IMAGE_CLAMP_BIT;
}
}
/* If the format is unsigned normalized, 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(texFormat) == GL_UNSIGNED_NORMALIZED &&
!_mesa_need_rgb_to_luminance_conversion(srcBaseFormat, dstBaseFormat)) {
transferOps &= ~IMAGE_CLAMP_BIT;
}
return transferOps;
}
/**
* Return true if memcpy cannot be used for ReadPixels.
*
* If uses_blit is true, the function returns true if a simple 3D engine blit
* cannot be used for ReadPixels packing.
*
* NOTE: This doesn't take swizzling and format conversions between
* the readbuffer and the pixel pack buffer into account.
*/
GLboolean
_mesa_readpixels_needs_slow_path(const struct gl_context *ctx, GLenum format,
GLenum type, GLboolean uses_blit)
{
struct gl_renderbuffer *rb =
_mesa_get_read_renderbuffer_for_format(ctx, format);
GLenum dstBaseFormat = _mesa_unpack_format_to_base_format(format);
assert(rb);
/* There are different rules depending on the base format. */
switch (format) {
case GL_DEPTH_STENCIL:
return !_mesa_has_depthstencil_combined(ctx->ReadBuffer) ||
ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f ||
ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset ||
ctx->Pixel.MapStencilFlag;
case GL_DEPTH_COMPONENT:
return ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f;
case GL_STENCIL_INDEX:
return ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset ||
ctx->Pixel.MapStencilFlag;
default:
/* Color formats. */
if (_mesa_need_rgb_to_luminance_conversion(rb->_BaseFormat,
dstBaseFormat)) {
return GL_TRUE;
}
/* And finally, see if there are any transfer ops. */
return _mesa_get_readpixels_transfer_ops(ctx, rb->Format, format, type,
uses_blit) != 0;
}
return GL_FALSE;
}
static GLboolean
readpixels_can_use_memcpy(const struct gl_context *ctx, GLenum format, GLenum type,
const struct gl_pixelstore_attrib *packing)
{
struct gl_renderbuffer *rb =
_mesa_get_read_renderbuffer_for_format(ctx, format);
assert(rb);
if (_mesa_readpixels_needs_slow_path(ctx, format, type, GL_FALSE)) {
return GL_FALSE;
}
/* The base internal format and the base Mesa format must match. */
if (rb->_BaseFormat != _mesa_get_format_base_format(rb->Format)) {
return GL_FALSE;
}
/* The Mesa format must match the input format and type. */
if (!_mesa_format_matches_format_and_type(rb->Format, format, type,
packing->SwapBytes, NULL)) {
return GL_FALSE;
}
return GL_TRUE;
}
static GLboolean
readpixels_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)
{
struct gl_renderbuffer *rb =
_mesa_get_read_renderbuffer_for_format(ctx, format);
GLubyte *dst, *map;
int dstStride, stride, j, texelBytes, bytesPerRow;
/* Fail if memcpy cannot be used. */
if (!readpixels_can_use_memcpy(ctx, format, type, packing)) {
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, ctx->ReadBuffer->FlipY);
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);
bytesPerRow = texelBytes * width;
/* memcpy*/
if (dstStride == stride && dstStride == bytesPerRow) {
memcpy(dst, map, bytesPerRow * height);
} else {
for (j = 0; j < height; j++) {
memcpy(dst, map, bytesPerRow);
dst += dstStride;
map += stride;
}
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
return GL_TRUE;
}
/**
* Optimized path for conversion of depth values to GL_DEPTH_COMPONENT,
* GL_UNSIGNED_INT.
*/
static GLboolean
read_uint_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 != 1.0F || ctx->Pixel.DepthBias != 0.0F)
return GL_FALSE;
if (packing->SwapBytes)
return GL_FALSE;
if (_mesa_get_format_datatype(rb->Format) != GL_UNSIGNED_NORMALIZED)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride, fb->FlipY);
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++) {
_mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst);
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;
GLfloat *depthValues;
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);
if (type == GL_UNSIGNED_INT &&
read_uint_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, fb->FlipY);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
depthValues = malloc(width * sizeof(GLfloat));
if (depthValues) {
/* General case (slower) */
for (j = 0; j < height; j++, y++) {
_mesa_unpack_float_z_row(rb->Format, width, map, depthValues);
_mesa_pack_depth_span(ctx, width, dst, type, depthValues, packing);
dst += dstStride;
map += stride;
}
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
}
free(depthValues);
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, *stencil;
GLint stride;
if (!rb)
return;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride, fb->FlipY);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
stencil = malloc(width * sizeof(GLubyte));
if (stencil) {
/* process image row by row */
for (j = 0; j < height; j++) {
GLvoid *dest;
_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;
}
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
}
free(stencil);
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;
bool dst_is_integer, convert_rgb_to_lum, needs_rebase;
int dst_stride, src_stride, rb_stride;
uint32_t dst_format, src_format;
GLubyte *dst, *map;
mesa_format rb_format;
bool needs_rgba;
void *rgba, *src;
bool src_is_uint = false;
uint8_t rebase_swizzle[4];
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
GLenum dstBaseFormat = _mesa_unpack_format_to_base_format(format);
if (!rb)
return;
transferOps = _mesa_get_readpixels_transfer_ops(ctx, rb->Format, format,
type, GL_FALSE);
/* Describe the dst format */
dst_is_integer = _mesa_is_enum_format_integer(format);
dst_stride = _mesa_image_row_stride(packing, width, format, type);
dst_format = _mesa_format_from_format_and_type(format, type);
convert_rgb_to_lum =
_mesa_need_rgb_to_luminance_conversion(rb->_BaseFormat, dstBaseFormat);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
/* Map the source render buffer */
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &rb_stride, fb->FlipY);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
rb_format = _mesa_get_srgb_format_linear(rb->Format);
/*
* Depending on the base formats involved in the conversion we might need to
* rebase some values, so for these formats we compute a rebase swizzle.
*/
if (rb->_BaseFormat == GL_LUMINANCE || rb->_BaseFormat == GL_INTENSITY) {
needs_rebase = true;
rebase_swizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebase_swizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebase_swizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebase_swizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
} else if (rb->_BaseFormat == GL_LUMINANCE_ALPHA) {
needs_rebase = true;
rebase_swizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebase_swizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebase_swizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebase_swizzle[3] = MESA_FORMAT_SWIZZLE_W;
} else if (_mesa_get_format_base_format(rb_format) != rb->_BaseFormat) {
needs_rebase =
_mesa_compute_rgba2base2rgba_component_mapping(rb->_BaseFormat,
rebase_swizzle);
} else {
needs_rebase = false;
}
/* Since _mesa_format_convert does not handle transferOps we need to handle
* them before we call the function. This requires to convert to RGBA float
* first so we can call _mesa_apply_rgba_transfer_ops. If the dst format is
* integer transferOps do not apply.
*
* Converting to luminance also requires converting to RGBA first, so we can
* then compute luminance values as L=R+G+B. Notice that this is different
* from GetTexImage, where we compute L=R.
*/
assert(!transferOps || (transferOps && !dst_is_integer));
needs_rgba = transferOps || convert_rgb_to_lum;
rgba = NULL;
if (needs_rgba) {
uint32_t rgba_format;
int rgba_stride;
bool need_convert;
/* Convert to RGBA float or int/uint depending on the type of the src */
if (dst_is_integer) {
src_is_uint = _mesa_is_format_unsigned(rb_format);
if (src_is_uint) {
rgba_format = RGBA32_UINT;
rgba_stride = width * 4 * sizeof(GLuint);
} else {
rgba_format = RGBA32_INT;
rgba_stride = width * 4 * sizeof(GLint);
}
} else {
rgba_format = RGBA32_FLOAT;
rgba_stride = width * 4 * sizeof(GLfloat);
}
/* If we are lucky and the dst format matches the RGBA format we need to
* convert to, then we can convert directly into the dst buffer and avoid
* the final conversion/copy from the rgba buffer to the dst buffer.
*/
if (dst_format == rgba_format &&
dst_stride == rgba_stride) {
need_convert = false;
rgba = dst;
} else {
need_convert = true;
rgba = malloc(height * rgba_stride);
if (!rgba) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
goto done_unmap;
}
}
/* Convert to RGBA now */
_mesa_format_convert(rgba, rgba_format, rgba_stride,
map, rb_format, rb_stride,
width, height,
needs_rebase ? rebase_swizzle : NULL);
/* Handle transfer ops if necessary */
if (transferOps)
_mesa_apply_rgba_transfer_ops(ctx, transferOps, width * height, rgba);
/* If we had to rebase, we have already taken care of that */
needs_rebase = false;
/* If we were lucky and our RGBA conversion matches the dst format, then
* we are done.
*/
if (!need_convert)
goto done_swap;
/* Otherwise, we need to convert from RGBA to dst next */
src = rgba;
src_format = rgba_format;
src_stride = rgba_stride;
} else {
/* No RGBA conversion needed, convert directly to dst */
src = map;
src_format = rb_format;
src_stride = rb_stride;
}
/* Do the conversion.
*
* If the dst format is Luminance, we need to do the conversion by computing
* L=R+G+B values.
*/
if (!convert_rgb_to_lum) {
_mesa_format_convert(dst, dst_format, dst_stride,
src, src_format, src_stride,
width, height,
needs_rebase ? rebase_swizzle : NULL);
} else if (!dst_is_integer) {
/* Compute float Luminance values from RGBA float */
int luminance_stride, luminance_bytes;
void *luminance;
uint32_t luminance_format;
luminance_stride = width * sizeof(GLfloat);
if (format == GL_LUMINANCE_ALPHA)
luminance_stride *= 2;
luminance_bytes = height * luminance_stride;
luminance = malloc(luminance_bytes);
if (!luminance) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
free(rgba);
goto done_unmap;
}
_mesa_pack_luminance_from_rgba_float(width * height, src,
luminance, format, transferOps);
/* Convert from Luminance float to dst (this will hadle type conversion
* from float to the type of dst if necessary)
*/
luminance_format = _mesa_format_from_format_and_type(format, GL_FLOAT);
_mesa_format_convert(dst, dst_format, dst_stride,
luminance, luminance_format, luminance_stride,
width, height, NULL);
free(luminance);
} else {
_mesa_pack_luminance_from_rgba_integer(width * height, src, !src_is_uint,
dst, format, type);
}
free(rgba);
done_swap:
/* Handle byte swapping if required */
if (packing->SwapBytes) {
_mesa_swap_bytes_2d_image(format, type, packing,
width, height, dst, dst);
}
done_unmap:
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
/**
* For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
* data (possibly swapping 8/24 vs 24/8 as we go).
*/
static GLboolean
fast_read_depth_stencil_pixels(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLubyte *dst, int dstStride)
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLubyte *map;
int stride, i;
if (rb != stencilRb)
return GL_FALSE;
if (rb->Format != MESA_FORMAT_S8_UINT_Z24_UNORM &&
rb->Format != MESA_FORMAT_Z24_UNORM_S8_UINT)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride, fb->FlipY);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return GL_TRUE; /* don't bother trying the slow path */
}
for (i = 0; i < height; i++) {
_mesa_unpack_uint_24_8_depth_stencil_row(rb->Format, width,
map, (GLuint *)dst);
map += stride;
dst += dstStride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
return GL_TRUE;
}
/**
* For non-float-depth and stencil buffers being read as 24/8 depth/stencil,
* copy the integer data directly instead of converting depth to float and
* re-packing.
*/
static GLboolean
fast_read_depth_stencil_pixels_separate(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
uint32_t *dst, int dstStride)
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *depthRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLubyte *depthMap, *stencilMap, *stencilVals;
int depthStride, stencilStride, i, j;
if (_mesa_get_format_datatype(depthRb->Format) != GL_UNSIGNED_NORMALIZED)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
GL_MAP_READ_BIT, &depthMap, &depthStride, fb->FlipY);
if (!depthMap) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return GL_TRUE; /* don't bother trying the slow path */
}
ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
GL_MAP_READ_BIT, &stencilMap, &stencilStride, fb->FlipY);
if (!stencilMap) {
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return GL_TRUE; /* don't bother trying the slow path */
}
stencilVals = malloc(width * sizeof(GLubyte));
if (stencilVals) {
for (j = 0; j < height; j++) {
_mesa_unpack_uint_z_row(depthRb->Format, width, depthMap, dst);
_mesa_unpack_ubyte_stencil_row(stencilRb->Format, width,
stencilMap, stencilVals);
for (i = 0; i < width; i++) {
dst[i] = (dst[i] & 0xffffff00) | stencilVals[i];
}
depthMap += depthStride;
stencilMap += stencilStride;
dst += dstStride / 4;
}
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
}
free(stencilVals);
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
return GL_TRUE;
}
static void
slow_read_depth_stencil_pixels_separate(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *packing,
GLubyte *dst, int dstStride)
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *depthRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLubyte *depthMap, *stencilMap;
int depthStride, stencilStride, j;
GLubyte *stencilVals;
GLfloat *depthVals;
/* The depth and stencil buffers might be separate, or a single buffer.
* If one buffer, only map it once.
*/
ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
GL_MAP_READ_BIT, &depthMap, &depthStride, fb->FlipY);
if (!depthMap) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
if (stencilRb != depthRb) {
ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
GL_MAP_READ_BIT, &stencilMap,
&stencilStride, fb->FlipY);
if (!stencilMap) {
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
}
else {
stencilMap = depthMap;
stencilStride = depthStride;
}
stencilVals = malloc(width * sizeof(GLubyte));
depthVals = malloc(width * sizeof(GLfloat));
if (stencilVals && depthVals) {
for (j = 0; j < height; j++) {
_mesa_unpack_float_z_row(depthRb->Format, width, depthMap, depthVals);
_mesa_unpack_ubyte_stencil_row(stencilRb->Format, width,
stencilMap, stencilVals);
_mesa_pack_depth_stencil_span(ctx, width, type, (GLuint *)dst,
depthVals, stencilVals, packing);
depthMap += depthStride;
stencilMap += stencilStride;
dst += dstStride;
}
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
}
free(stencilVals);
free(depthVals);
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
if (stencilRb != depthRb) {
ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
}
}
/**
* Read combined depth/stencil values.
* We'll have already done error checking to be sure the expected
* depth and stencil buffers really exist.
*/
static void
read_depth_stencil_pixels(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
const GLboolean scaleOrBias
= ctx->Pixel.DepthScale != 1.0F || ctx->Pixel.DepthBias != 0.0F;
const GLboolean stencilTransfer = ctx->Pixel.IndexShift
|| ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
GLubyte *dst;
int dstStride;
dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
width, height,
GL_DEPTH_STENCIL_EXT,
type, 0, 0);
dstStride = _mesa_image_row_stride(packing, width,
GL_DEPTH_STENCIL_EXT, type);
/* Fast 24/8 reads. */
if (type == GL_UNSIGNED_INT_24_8 &&
!scaleOrBias && !stencilTransfer && !packing->SwapBytes) {
if (fast_read_depth_stencil_pixels(ctx, x, y, width, height,
dst, dstStride))
return;
if (fast_read_depth_stencil_pixels_separate(ctx, x, y, width, height,
(uint32_t *)dst, dstStride))
return;
}
slow_read_depth_stencil_pixels_separate(ctx, x, y, width, height,
type, packing,
dst, dstStride);
}
/**
* 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)
{
if (ctx->NewState)
_mesa_update_state(ctx);
pixels = _mesa_map_pbo_dest(ctx, packing, pixels);
if (pixels) {
/* Try memcpy first. */
if (readpixels_memcpy(ctx, x, y, width, height, format, type,
pixels, packing)) {
_mesa_unmap_pbo_dest(ctx, packing);
return;
}
/* Otherwise take the slow path. */
switch (format) {
case GL_STENCIL_INDEX:
read_stencil_pixels(ctx, x, y, width, height, type, pixels,
packing);
break;
case GL_DEPTH_COMPONENT:
read_depth_pixels(ctx, x, y, width, height, type, pixels,
packing);
break;
case GL_DEPTH_STENCIL_EXT:
read_depth_stencil_pixels(ctx, x, y, width, height, type, pixels,
packing);
break;
default:
/* all other formats should be color formats */
read_rgba_pixels(ctx, x, y, width, height, format, type, pixels,
packing);
}
_mesa_unmap_pbo_dest(ctx, packing);
}
}
static GLenum
read_pixels_es3_error_check(struct gl_context *ctx, GLenum format, GLenum type,
const struct gl_renderbuffer *rb)
{
const GLenum internalFormat = rb->InternalFormat;
const GLenum data_type = _mesa_get_format_datatype(rb->Format);
GLboolean is_unsigned_int = GL_FALSE;
GLboolean is_signed_int = GL_FALSE;
GLboolean is_float_depth = (internalFormat == GL_DEPTH_COMPONENT32F) ||
(internalFormat == GL_DEPTH32F_STENCIL8);
is_unsigned_int = _mesa_is_enum_format_unsigned_int(internalFormat);
if (!is_unsigned_int) {
is_signed_int = _mesa_is_enum_format_signed_int(internalFormat);
}
switch (format) {
case GL_RGBA:
if (type == GL_FLOAT && data_type == GL_FLOAT)
return GL_NO_ERROR; /* EXT_color_buffer_float */
if (type == GL_UNSIGNED_BYTE && data_type == GL_UNSIGNED_NORMALIZED)
return GL_NO_ERROR;
if (internalFormat == GL_RGB10_A2 &&
type == GL_UNSIGNED_INT_2_10_10_10_REV)
return GL_NO_ERROR;
if (internalFormat == GL_RGB10_A2UI && type == GL_UNSIGNED_BYTE)
return GL_NO_ERROR;
if (type == GL_UNSIGNED_SHORT) {
switch (internalFormat) {
case GL_R16:
case GL_RG16:
case GL_RGB16:
case GL_RGBA16:
if (_mesa_has_EXT_texture_norm16(ctx))
return GL_NO_ERROR;
}
}
break;
case GL_BGRA:
/* GL_EXT_read_format_bgra */
if (type == GL_UNSIGNED_BYTE ||
type == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
type == GL_UNSIGNED_SHORT_1_5_5_5_REV)
return GL_NO_ERROR;
break;
case GL_RGBA_INTEGER:
if ((is_signed_int && type == GL_INT) ||
(is_unsigned_int && type == GL_UNSIGNED_INT))
return GL_NO_ERROR;
break;
case GL_DEPTH_STENCIL:
switch (type) {
case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
if (is_float_depth)
return GL_NO_ERROR;
break;
case GL_UNSIGNED_INT_24_8:
if (!is_float_depth)
return GL_NO_ERROR;
break;
default:
return GL_INVALID_ENUM;
}
break;
case GL_DEPTH_COMPONENT:
switch (type) {
case GL_FLOAT:
if (is_float_depth)
return GL_NO_ERROR;
break;
case GL_UNSIGNED_SHORT:
case GL_UNSIGNED_INT:
case GL_UNSIGNED_INT_24_8:
if (!is_float_depth)
return GL_NO_ERROR;
break;
default:
return GL_INVALID_ENUM;
}
break;
case GL_STENCIL_INDEX:
switch (type) {
case GL_UNSIGNED_BYTE:
return GL_NO_ERROR;
default:
return GL_INVALID_ENUM;
}
break;
}
return GL_INVALID_OPERATION;
}
static ALWAYS_INLINE void
read_pixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
GLenum type, GLsizei bufSize, GLvoid *pixels, bool no_error)
{
GLenum err = GL_NO_ERROR;
struct gl_renderbuffer *rb;
struct gl_pixelstore_attrib clippedPacking;
GET_CURRENT_CONTEXT(ctx);
FLUSH_VERTICES(ctx, 0);
FLUSH_CURRENT(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadPixels(%d, %d, %s, %s, %p)\n",
width, height,
_mesa_enum_to_string(format),
_mesa_enum_to_string(type),
pixels);
if (!no_error && (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 (!no_error && ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
_mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
"glReadPixels(incomplete framebuffer)" );
return;
}
rb = _mesa_get_read_renderbuffer_for_format(ctx, format);
if (!no_error) {
if (rb == NULL) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(read buffer)");
return;
}
/* OpenGL ES 1.x and OpenGL ES 2.0 impose additional restrictions on the
* combinations of format and type that can be used.
*
* Technically, only two combinations are actually allowed:
* GL_RGBA/GL_UNSIGNED_BYTE, and some implementation-specific internal
* preferred combination. This code doesn't know what that preferred
* combination is, and Mesa can handle anything valid. Just work instead.
*/
if (_mesa_is_gles(ctx)) {
if (ctx->API == API_OPENGLES2 &&
_mesa_is_color_format(format) &&
_mesa_get_color_read_format(ctx, NULL, "glReadPixels") == format &&
_mesa_get_color_read_type(ctx, NULL, "glReadPixels") == type) {
err = GL_NO_ERROR;
} else if (ctx->Version < 30) {
err = _mesa_es_error_check_format_and_type(ctx, format, type, 2);
if (err == GL_NO_ERROR) {
if (type == GL_FLOAT || type == GL_HALF_FLOAT_OES) {
err = GL_INVALID_OPERATION;
}
}
} else {
err = read_pixels_es3_error_check(ctx, format, type, rb);
}
if (err != GL_NO_ERROR) {
_mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)",
_mesa_enum_to_string(format),
_mesa_enum_to_string(type));
return;
}
}
err = _mesa_error_check_format_and_type(ctx, format, type);
if (err != GL_NO_ERROR) {
_mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)",
_mesa_enum_to_string(format),
_mesa_enum_to_string(type));
return;
}
if (_mesa_is_user_fbo(ctx->ReadBuffer) &&
ctx->ReadBuffer->Visual.samples > 0) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(multisample FBO)");
return;
}
if (!_mesa_source_buffer_exists(ctx, format)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)");
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_enum_format_integer(format);
if (dstInteger != srcInteger) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(integer / non-integer format mismatch");
return;
}
}
}
/* Do all needed clipping here, so that we can forget about it later */
clippedPacking = ctx->Pack;
if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking))
return; /* nothing to do */
if (!no_error) {
if (!_mesa_validate_pbo_access(2, &ctx->Pack, width, height, 1,
format, type, bufSize, pixels)) {
if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(out of bounds PBO access)");
} else {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadnPixelsARB(out of bounds access:"
" bufSize (%d) is too small)", bufSize);
}
return;
}
if (_mesa_is_bufferobj(ctx->Pack.BufferObj) &&
_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
/* buffer is mapped - that's an error */
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
return;
}
}
ctx->Driver.ReadPixels(ctx, x, y, width, height,
format, type, &clippedPacking, pixels);
}
void GLAPIENTRY
_mesa_ReadnPixelsARB_no_error(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLsizei bufSize,
GLvoid *pixels)
{
read_pixels(x, y, width, height, format, type, bufSize, pixels, true);
}
void GLAPIENTRY
_mesa_ReadnPixelsARB(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLsizei bufSize,
GLvoid *pixels)
{
read_pixels(x, y, width, height, format, type, bufSize, pixels, false);
}
void GLAPIENTRY
_mesa_ReadPixels_no_error(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid *pixels)
{
_mesa_ReadnPixelsARB_no_error(x, y, width, height, format, type, INT_MAX,
pixels);
}
void GLAPIENTRY
_mesa_ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid *pixels)
{
_mesa_ReadnPixelsARB(x, y, width, height, format, type, INT_MAX, pixels);
}
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