#include "glheader.h"
#include "bufferobj.h"
#include "colormac.h"
#include "convolve.h"
#include "context.h"
#include "feedback.h"
#include "image.h"
#include "macros.h"
#include "imports.h"
#include "pixel.h"
#include "state.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_span.h"
#include "s_stencil.h"
static void
read_index_pixels( GLcontext *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
GLint i;
if (!rb)
return;
ASSERT(width <= MAX_WIDTH);
for (i = 0; i < height; i++) {
GLuint index[MAX_WIDTH];
GLvoid *dest;
ASSERT(rb->DataType == GL_UNSIGNED_INT);
rb->GetRow(ctx, rb, width, x, y + i, index);
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_COLOR_INDEX, type, i, 0);
_mesa_pack_index_span(ctx, width, type, dest, index,
&ctx->Pack, ctx->_ImageTransferState);
}
}
static void
read_depth_pixels( GLcontext *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->_DepthBuffer;
const GLboolean biasOrScale
= ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
if (!rb)
return;
ASSERT(x >= 0);
ASSERT(y >= 0);
ASSERT(x + width <= (GLint) rb->Width);
ASSERT(y + height <= (GLint) rb->Height);
ASSERT(width <= MAX_WIDTH);
if (type == GL_UNSIGNED_SHORT && fb->Visual.depthBits == 16
&& !biasOrScale && !packing->SwapBytes) {
GLint j;
ASSERT(rb->InternalFormat == GL_DEPTH_COMPONENT16);
ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
for (j = 0; j < height; j++, y++) {
void *dest =_mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, j, 0);
rb->GetRow(ctx, rb, width, x, y, dest);
}
}
else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 24
&& !biasOrScale && !packing->SwapBytes) {
GLint j;
ASSERT(rb->InternalFormat == GL_DEPTH_COMPONENT24);
ASSERT(rb->DataType == GL_UNSIGNED_INT);
for (j = 0; j < height; j++, y++) {
GLuint *dest = (GLuint *)
_mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, j, 0);
GLint k;
rb->GetRow(ctx, rb, width, x, y, dest);
for (k = 0; k < width; k++) {
dest[k] = (dest[k] << 8) | ((dest[k] >> 16) & 0xff);
}
}
}
else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 32
&& !biasOrScale && !packing->SwapBytes) {
GLint j;
ASSERT(rb->InternalFormat == GL_DEPTH_COMPONENT32);
ASSERT(rb->DataType == GL_UNSIGNED_INT);
for (j = 0; j < height; j++, y++) {
void *dest = _mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, j, 0);
rb->GetRow(ctx, rb, width, x, y, dest);
}
}
else {
GLint j;
for (j = 0; j < height; j++, y++) {
GLfloat depthValues[MAX_WIDTH];
GLvoid *dest = _mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_COMPONENT, type, j, 0);
_swrast_read_depth_span_float(ctx, rb, width, x, y, depthValues);
_mesa_pack_depth_span(ctx, width, dest, type, depthValues, packing);
}
}
}
static void
read_stencil_pixels( GLcontext *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->_StencilBuffer;
GLint j;
if (!rb)
return;
ASSERT(width <= MAX_WIDTH);
for (j=0;j<height;j++,y++) {
GLvoid *dest;
GLstencil stencil[MAX_WIDTH];
_swrast_read_stencil_span(ctx, rb, width, x, y, 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);
}
}
static GLboolean
fast_read_rgba_pixels( GLcontext *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;
if (!rb)
return GL_FALSE;
ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB);
ASSERT(x + width <= (GLint) rb->Width);
ASSERT(y + height <= (GLint) rb->Height);
if (transferOps ||
packing->SwapBytes ||
packing->LsbFirst) {
return GL_FALSE;
}
if (format == GL_RGBA && rb->DataType == type) {
const GLint dstStride = _mesa_image_row_stride(packing, width,
format, type);
GLubyte *dest
= (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
GLint row;
ASSERT(rb->GetRow);
for (row = 0; row < height; row++) {
rb->GetRow(ctx, rb, width, x, y + row, dest);
dest += dstStride;
}
return GL_TRUE;
}
if (format == GL_RGB &&
rb->DataType == GL_UNSIGNED_BYTE &&
type == GL_UNSIGNED_BYTE) {
const GLint dstStride = _mesa_image_row_stride(packing, width,
format, type);
GLubyte *dest
= (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
GLint row;
ASSERT(rb->GetRow);
for (row = 0; row < height; row++) {
GLubyte tempRow[MAX_WIDTH][4];
GLint col;
rb->GetRow(ctx, rb, width, x, y + row, tempRow);
for (col = 0; col < width; col++) {
dest[col * 3 + 0] = tempRow[col][0];
dest[col * 3 + 1] = tempRow[col][1];
dest[col * 3 + 2] = tempRow[col][2];
}
dest += dstStride;
}
return GL_TRUE;
}
return GL_FALSE;
}
static void
adjust_colors(GLcontext *ctx, GLuint n, GLfloat rgba[][4])
{
const GLuint rShift = 8 - ctx->Visual.redBits;
const GLuint gShift = 8 - ctx->Visual.greenBits;
const GLuint bShift = 8 - ctx->Visual.blueBits;
const GLfloat rScale = 1.0F / (GLfloat) ((1 << ctx->Visual.redBits ) - 1);
const GLfloat gScale = 1.0F / (GLfloat) ((1 << ctx->Visual.greenBits) - 1);
const GLfloat bScale = 1.0F / (GLfloat) ((1 << ctx->Visual.blueBits ) - 1);
GLuint i;
for (i = 0; i < n; i++) {
GLint r, g, b;
CLAMPED_FLOAT_TO_UBYTE(r, rgba[i][RCOMP]);
CLAMPED_FLOAT_TO_UBYTE(g, rgba[i][GCOMP]);
CLAMPED_FLOAT_TO_UBYTE(b, rgba[i][BCOMP]);
rgba[i][RCOMP] = (GLfloat) (r >> rShift) * rScale;
rgba[i][GCOMP] = (GLfloat) (g >> gShift) * gScale;
rgba[i][BCOMP] = (GLfloat) (b >> bShift) * bScale;
}
}
static void
read_rgba_pixels( GLcontext *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLbitfield transferOps = ctx->_ImageTransferState;
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
if (!rb)
return;
if (type == GL_FLOAT && ((ctx->Color.ClampReadColor == GL_TRUE) ||
(ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB &&
rb->DataType != GL_FLOAT)))
transferOps |= IMAGE_CLAMP_BIT;
if (fast_read_rgba_pixels(ctx, x, y, width, height,
format, type, pixels, packing, transferOps)) {
return;
}
ASSERT(width <= MAX_WIDTH);
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
GLfloat *dest, *src, *tmpImage, *convImage;
GLint row;
tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
_mesa_free(tmpImage);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
dest = tmpImage;
for (row = 0; row < height; row++, y++) {
if (fb->Visual.rgbMode) {
_swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, dest);
}
else {
GLuint index[MAX_WIDTH];
ASSERT(rb->DataType == GL_UNSIGNED_INT);
rb->GetRow(ctx, rb, width, x, y, index);
_mesa_apply_ci_transfer_ops(ctx,
transferOps & IMAGE_SHIFT_OFFSET_BIT,
width, index);
_mesa_map_ci_to_rgba(ctx, width, index, (GLfloat (*)[4]) dest);
}
_mesa_apply_rgba_transfer_ops(ctx,
transferOps & IMAGE_PRE_CONVOLUTION_BITS,
width, (GLfloat (*)[4]) dest);
dest += width * 4;
}
if (ctx->Pixel.Convolution2DEnabled) {
_mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
}
else {
ASSERT(ctx->Pixel.Separable2DEnabled);
_mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
}
_mesa_free(tmpImage);
src = convImage;
for (row = 0; row < height; row++) {
GLvoid *dest;
dest = _mesa_image_address2d(packing, pixels, width, height,
format, type, row, 0);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) src,
format, type, dest, packing,
transferOps & IMAGE_POST_CONVOLUTION_BITS);
src += width * 4;
}
_mesa_free(convImage);
}
else {
const GLint dstStride
= _mesa_image_row_stride(packing, width, format, type);
GLfloat (*rgba)[4] = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
GLint row;
GLubyte *dst
= (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
transferOps &= ~(IMAGE_CONVOLUTION_BIT |
IMAGE_POST_CONVOLUTION_SCALE_BIAS);
for (row = 0; row < height; row++, y++) {
if (fb->Visual.rgbMode) {
_swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, rgba);
}
else {
GLuint index[MAX_WIDTH];
ASSERT(rb->DataType == GL_UNSIGNED_INT);
rb->GetRow(ctx, rb, width, x, y, index);
_mesa_apply_ci_transfer_ops(ctx,
transferOps & IMAGE_SHIFT_OFFSET_BIT,
width, index);
_mesa_map_ci_to_rgba(ctx, width, index, rgba);
}
if (fb->Visual.redBits < 8 ||
fb->Visual.greenBits < 8 ||
fb->Visual.blueBits < 8) {
adjust_colors(ctx, width, rgba);
}
_mesa_pack_rgba_span_float(ctx, width, rgba, format, type, dst,
packing, transferOps);
dst += dstStride;
}
}
}
static void
read_depth_stencil_pixels(GLcontext *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 != 1.0 || ctx->Pixel.DepthBias != 0.0;
const GLboolean stencilTransfer = ctx->Pixel.IndexShift
|| ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
struct gl_renderbuffer *depthRb, *stencilRb;
depthRb = ctx->ReadBuffer->_DepthBuffer;
stencilRb = ctx->ReadBuffer->_StencilBuffer;
if (!depthRb || !stencilRb)
return;
depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
depthRb == stencilRb &&
!scaleOrBias &&
!stencilTransfer) {
GLint i;
GLint dstStride = _mesa_image_row_stride(packing, width,
GL_DEPTH_STENCIL_EXT, type);
GLubyte *dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
width, height,
GL_DEPTH_STENCIL_EXT,
type, 0, 0);
for (i = 0; i < height; i++) {
depthRb->GetRow(ctx, depthRb, width, x, y + i, dst);
dst += dstStride;
}
}
else {
GLint i;
depthRb = ctx->ReadBuffer->_DepthBuffer;
stencilRb = ctx->ReadBuffer->_StencilBuffer;
for (i = 0; i < height; i++) {
GLstencil stencilVals[MAX_WIDTH];
GLuint *depthStencilDst = (GLuint *)
_mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_STENCIL_EXT, type, i, 0);
_swrast_read_stencil_span(ctx, stencilRb, width,
x, y + i, stencilVals);
if (!scaleOrBias && !stencilTransfer
&& ctx->ReadBuffer->Visual.depthBits == 24) {
GLuint zVals[MAX_WIDTH];
GLint j;
ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
depthRb->GetRow(ctx, depthRb, width, x, y + i, zVals);
for (j = 0; j < width; j++) {
depthStencilDst[j] = (zVals[j] << 8) | (stencilVals[j] & 0xff);
}
}
else {
GLfloat depthVals[MAX_WIDTH];
_swrast_read_depth_span_float(ctx, depthRb, width, x, y + i,
depthVals);
_mesa_pack_depth_stencil_span(ctx, width, depthStencilDst,
depthVals, stencilVals, packing);
}
}
}
}
void
_swrast_ReadPixels( GLcontext *ctx,
GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *packing,
GLvoid *pixels )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_pixelstore_attrib clippedPacking = *packing;
RENDER_START(swrast, ctx);
if (ctx->NewState)
_mesa_update_state(ctx);
if (swrast->NewState)
_swrast_validate_derived( ctx );
if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
RENDER_FINISH(swrast, ctx);
return;
}
if (clippedPacking.BufferObj->Name) {
GLubyte *buf;
if (!_mesa_validate_pbo_access(2, &clippedPacking, width, height, 1,
format, type, pixels)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(invalid PBO access)");
RENDER_FINISH(swrast, ctx);
return;
}
buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
GL_WRITE_ONLY_ARB,
clippedPacking.BufferObj);
if (!buf) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
RENDER_FINISH(swrast, ctx);
return;
}
pixels = ADD_POINTERS(buf, pixels);
}
switch (format) {
case GL_COLOR_INDEX:
read_index_pixels(ctx, x, y, width, height, type, pixels,
&clippedPacking);
break;
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;
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_RGB:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_RGBA:
case GL_BGR:
case GL_BGRA:
case GL_ABGR_EXT:
read_rgba_pixels(ctx, x, y, width, height,
format, type, pixels, &clippedPacking);
break;
case GL_DEPTH_STENCIL_EXT:
read_depth_stencil_pixels(ctx, x, y, width, height,
type, pixels, &clippedPacking);
break;
default:
_mesa_problem(ctx, "unexpected format in _swrast_ReadPixels");
}
RENDER_FINISH(swrast, ctx);
if (clippedPacking.BufferObj->Name) {
ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
clippedPacking.BufferObj);
}
}