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Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_readpix.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_readpix.c584
1 files changed, 584 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_readpix.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_readpix.c
new file mode 100644
index 000000000..dda35044a
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/swrast/s_readpix.c
@@ -0,0 +1,584 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.4.1
+ *
+ * Copyright (C) 1999-2005 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 "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 "s_context.h"
+#include "s_depth.h"
+#include "s_span.h"
+#include "s_stencil.h"
+
+
+
+/*
+ * Read a block of color index pixels.
+ */
+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;
+ /*
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ */
+ GLint i, readWidth;
+
+ /* error checking */
+ if (ctx->Visual.rgbMode) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels" );
+ return;
+ }
+
+ if (type != GL_BYTE &&
+ type != GL_UNSIGNED_BYTE &&
+ type != GL_SHORT &&
+ type != GL_UNSIGNED_SHORT &&
+ type != GL_INT &&
+ type != GL_UNSIGNED_INT &&
+ type != GL_FLOAT) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels(index type)");
+ return;
+ }
+
+ _swrast_use_read_buffer(ctx);
+
+ /* XXX: width should never be > MAX_WIDTH since we did clipping earlier */
+ readWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+
+ /* process image row by row */
+ for (i = 0; i < height; i++) {
+ GLuint index[MAX_WIDTH];
+ GLvoid *dest;
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
+ rb->GetRow(ctx, rb, readWidth, x, y + i, index);
+
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ GL_COLOR_INDEX, type, i, 0);
+
+ _mesa_pack_index_span(ctx, readWidth, type, dest, index,
+ &ctx->Pack, ctx->_ImageTransferState);
+ }
+
+ _swrast_use_draw_buffer(ctx);
+}
+
+
+
+/**
+ * Read pixels for format=GL_DEPTH_COMPONENT.
+ */
+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_renderbuffer *rb
+ = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+ GLint readWidth;
+ GLboolean bias_or_scale;
+
+ /* Error checking */
+ if (ctx->ReadBuffer->Visual.depthBits <= 0 || !rb) {
+ /* No depth buffer */
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels" );
+ return;
+ }
+
+ if (type != GL_BYTE &&
+ type != GL_UNSIGNED_BYTE &&
+ type != GL_SHORT &&
+ type != GL_UNSIGNED_SHORT &&
+ type != GL_INT &&
+ type != GL_UNSIGNED_INT &&
+ type != GL_FLOAT) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels(depth type)");
+ return;
+ }
+
+ /* XXX: width should never be > MAX_WIDTH since we did clipping earlier */
+ readWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+
+ bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
+
+ if (type==GL_UNSIGNED_SHORT && ctx->ReadBuffer->Visual.depthBits == 16
+ && !bias_or_scale && !packing->SwapBytes) {
+ /* Special case: directly read 16-bit unsigned depth values. */
+ GLint j;
+ for (j=0;j<height;j++,y++) {
+ GLdepth depth[MAX_WIDTH];
+ GLushort *dst = (GLushort*) _mesa_image_address2d(packing, pixels,
+ width, height, GL_DEPTH_COMPONENT, type, j, 0);
+ GLint i;
+ _swrast_read_depth_span(ctx, rb, width, x, y, depth);
+ for (i = 0; i < width; i++)
+ dst[i] = depth[i];
+ }
+ }
+ else if (type==GL_UNSIGNED_INT && ctx->ReadBuffer->Visual.depthBits == 32
+ && !bias_or_scale && !packing->SwapBytes) {
+ /* Special case: directly read 32-bit unsigned depth values. */
+ GLint j;
+ for (j=0;j<height;j++,y++) {
+ GLdepth *dst = (GLdepth *) _mesa_image_address2d(packing, pixels,
+ width, height, GL_DEPTH_COMPONENT, type, j, 0);
+ _swrast_read_depth_span(ctx, rb, width, x, y, dst);
+ }
+ }
+ else {
+ /* General case (slower) */
+ GLint j;
+ for (j=0;j<height;j++,y++) {
+ GLfloat depth[MAX_WIDTH];
+ GLvoid *dest;
+
+ _swrast_read_depth_span_float(ctx, rb, readWidth, x, y, depth);
+
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ GL_DEPTH_COMPONENT, type, j, 0);
+
+ _mesa_pack_depth_span(ctx, readWidth, (GLdepth *) dest, type,
+ depth, packing);
+ }
+ }
+}
+
+
+/**
+ * Read pixels for format=GL_STENCIL_INDEX.
+ */
+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_renderbuffer *rb
+ = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+ GLint j, readWidth;
+
+ if (type != GL_BYTE &&
+ type != GL_UNSIGNED_BYTE &&
+ type != GL_SHORT &&
+ type != GL_UNSIGNED_SHORT &&
+ type != GL_INT &&
+ type != GL_UNSIGNED_INT &&
+ type != GL_FLOAT &&
+ type != GL_BITMAP) {
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels(stencil type)");
+ return;
+ }
+
+ if (ctx->ReadBuffer->Visual.stencilBits <= 0 || !rb) {
+ /* No stencil buffer */
+ _mesa_error( ctx, GL_INVALID_OPERATION, "glReadPixels" );
+ return;
+ }
+
+ /* XXX: width should never be > MAX_WIDTH since we did clipping earlier */
+ readWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+
+ /* process image row by row */
+ for (j=0;j<height;j++,y++) {
+ GLvoid *dest;
+ GLstencil stencil[MAX_WIDTH];
+
+ _swrast_read_stencil_span(ctx, rb, readWidth, x, y, stencil);
+
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ GL_STENCIL_INDEX, type, j, 0);
+
+ _mesa_pack_stencil_span(ctx, readWidth, type, dest, stencil, packing);
+ }
+}
+
+
+
+/**
+ * Optimized glReadPixels for particular pixel formats:
+ * GL_UNSIGNED_BYTE, GL_RGBA
+ * when pixel scaling, biasing and mapping are disabled.
+ */
+static GLboolean
+read_fast_rgba_pixels( GLcontext *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 = ctx->ReadBuffer->_ColorReadBuffer;
+ /* can't do scale, bias, mapping, etc */
+ if (ctx->_ImageTransferState)
+ return GL_FALSE;
+
+ /* can't do fancy pixel packing */
+ if (packing->Alignment != 1 || packing->SwapBytes || packing->LsbFirst)
+ return GL_FALSE;
+
+ {
+ GLint srcX = x;
+ GLint srcY = y;
+ GLint readWidth = width; /* actual width read */
+ GLint readHeight = height; /* actual height read */
+ GLint skipPixels = packing->SkipPixels;
+ GLint skipRows = packing->SkipRows;
+ GLint rowLength;
+
+ if (packing->RowLength > 0)
+ rowLength = packing->RowLength;
+ else
+ rowLength = width;
+
+ /*
+ * Ready to read!
+ * The window region at (destX, destY) of size (readWidth, readHeight)
+ * will be read back.
+ * We'll write pixel data to buffer pointed to by "pixels" but we'll
+ * skip "skipRows" rows and skip "skipPixels" pixels/row.
+ */
+#if CHAN_BITS == 8
+ if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
+#elif CHAN_BITS == 16
+ if (format == GL_RGBA && type == GL_UNSIGNED_SHORT) {
+#else
+ if (0) {
+#endif
+ GLchan *dest = (GLchan *) pixels
+ + (skipRows * rowLength + skipPixels) * 4;
+ GLint row;
+
+ if (packing->Invert) {
+ /* start at top and go down */
+ dest += (readHeight - 1) * rowLength * 4;
+ rowLength = -rowLength;
+ }
+
+ ASSERT(rb->GetRow);
+ for (row=0; row<readHeight; row++) {
+ rb->GetRow(ctx, rb, readWidth, srcX, srcY, dest);
+ dest += rowLength * 4;
+ srcY++;
+ }
+ return GL_TRUE;
+ }
+ else {
+ /* can't do this format/type combination */
+ return GL_FALSE;
+ }
+ }
+}
+
+
+
+/*
+ * Read R, G, B, A, RGB, L, or LA pixels.
+ */
+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 )
+{
+ struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
+ GLint readWidth;
+
+ if (!rb) {
+ /* No readbuffer is OK with GL_EXT_framebuffer_object */
+ return;
+ }
+
+ /* do error checking on pixel type, format was already checked by caller */
+ switch (type) {
+ case GL_UNSIGNED_BYTE:
+ case GL_BYTE:
+ case GL_UNSIGNED_SHORT:
+ case GL_SHORT:
+ case GL_UNSIGNED_INT:
+ case GL_INT:
+ case GL_FLOAT:
+ case GL_UNSIGNED_BYTE_3_3_2:
+ case GL_UNSIGNED_BYTE_2_3_3_REV:
+ case GL_UNSIGNED_SHORT_5_6_5:
+ case GL_UNSIGNED_SHORT_5_6_5_REV:
+ case GL_UNSIGNED_SHORT_4_4_4_4:
+ case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+ case GL_UNSIGNED_SHORT_5_5_5_1:
+ case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+ case GL_UNSIGNED_INT_8_8_8_8:
+ case GL_UNSIGNED_INT_8_8_8_8_REV:
+ case GL_UNSIGNED_INT_10_10_10_2:
+ case GL_UNSIGNED_INT_2_10_10_10_REV:
+ /* valid pixel type */
+ break;
+ case GL_HALF_FLOAT_ARB:
+ if (!ctx->Extensions.ARB_half_float_pixel) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glReadPixels(type)" );
+ return;
+ }
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glReadPixels(type)" );
+ return;
+ }
+
+ if (!_mesa_is_legal_format_and_type(ctx, format, type) ||
+ format == GL_INTENSITY) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(format or type)");
+ return;
+ }
+
+ _swrast_use_read_buffer(ctx);
+
+ /* Try optimized path first */
+ if (read_fast_rgba_pixels( ctx, x, y, width, height,
+ format, type, pixels, packing )) {
+
+ _swrast_use_draw_buffer(ctx);
+ return; /* done! */
+ }
+
+ /* XXX: width should never be > MAX_WIDTH since we did clipping earlier */
+ readWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+
+
+ if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+ const GLuint transferOps = ctx->_ImageTransferState;
+ 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;
+ }
+
+ /* read full RGBA, FLOAT image */
+ dest = tmpImage;
+ for (row = 0; row < height; row++, y++) {
+ GLchan rgba[MAX_WIDTH][4];
+ if (ctx->Visual.rgbMode) {
+ _swrast_read_rgba_span(ctx, rb, readWidth, x, y, rgba);
+ }
+ else {
+ GLuint index[MAX_WIDTH];
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
+ rb->GetRow(ctx, rb, readWidth, x, y, index);
+ if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset !=0 ) {
+ _mesa_map_ci(ctx, readWidth, index);
+ }
+ _mesa_map_ci_to_rgba_chan(ctx, readWidth, index, rgba);
+ }
+ _mesa_pack_rgba_span_chan(ctx, readWidth, (const GLchan (*)[4]) rgba,
+ GL_RGBA, GL_FLOAT, dest, &ctx->DefaultPacking,
+ transferOps & IMAGE_PRE_CONVOLUTION_BITS);
+ dest += width * 4;
+ }
+
+ /* do convolution */
+ if (ctx->Pixel.Convolution2DEnabled) {
+ _mesa_convolve_2d_image(ctx, &readWidth, &height, tmpImage, convImage);
+ }
+ else {
+ ASSERT(ctx->Pixel.Separable2DEnabled);
+ _mesa_convolve_sep_image(ctx, &readWidth, &height, tmpImage, convImage);
+ }
+ _mesa_free(tmpImage);
+
+ /* finish transfer ops and pack the resulting image */
+ src = convImage;
+ for (row = 0; row < height; row++) {
+ GLvoid *dest;
+ dest = _mesa_image_address2d(packing, pixels, readWidth, height,
+ format, type, row, 0);
+ _mesa_pack_rgba_span_float(ctx, readWidth,
+ (const GLfloat (*)[4]) src,
+ format, type, dest, packing,
+ transferOps & IMAGE_POST_CONVOLUTION_BITS);
+ src += readWidth * 4;
+ }
+ }
+ else {
+ /* no convolution */
+ GLint row;
+ for (row = 0; row < height; row++, y++) {
+ GLchan rgba[MAX_WIDTH][4];
+ GLvoid *dst;
+ if (ctx->Visual.rgbMode) {
+ _swrast_read_rgba_span(ctx, rb, readWidth, x, y, rgba);
+ }
+ else {
+ GLuint index[MAX_WIDTH];
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
+ rb->GetRow(ctx, rb, readWidth, x, y, index);
+ if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
+ _mesa_map_ci(ctx, readWidth, index);
+ }
+ _mesa_map_ci_to_rgba_chan(ctx, readWidth, index, rgba);
+ }
+ dst = _mesa_image_address2d(packing, pixels, width, height,
+ format, type, row, 0);
+ if (ctx->Visual.redBits < CHAN_BITS ||
+ ctx->Visual.greenBits < CHAN_BITS ||
+ ctx->Visual.blueBits < CHAN_BITS) {
+ /* Requantize the color values into floating point and go from
+ * there. This fixes conformance failures with 16-bit color
+ * buffers, for example.
+ */
+ DEFMARRAY(GLfloat, rgbaf, MAX_WIDTH, 4); /* mac 32k limitation */
+ CHECKARRAY(rgbaf, return); /* mac 32k limitation */
+ _mesa_chan_to_float_span(ctx, readWidth,
+ (CONST GLchan (*)[4]) rgba, rgbaf);
+ _mesa_pack_rgba_span_float(ctx, readWidth,
+ (CONST GLfloat (*)[4]) rgbaf,
+ format, type, dst, packing,
+ ctx->_ImageTransferState);
+ UNDEFARRAY(rgbaf); /* mac 32k limitation */
+ }
+ else {
+ /* GLubytes are fine */
+ _mesa_pack_rgba_span_chan(ctx, readWidth, (CONST GLchan (*)[4]) rgba,
+ format, type, dst, packing,
+ ctx->_ImageTransferState);
+ }
+ }
+ }
+
+ _swrast_use_draw_buffer(ctx);
+}
+
+
+/**
+ * Software fallback routine for ctx->Driver.ReadPixels().
+ * We wind up using the swrast->ReadSpan() routines to do the job.
+ */
+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;
+
+ if (swrast->NewState)
+ _swrast_validate_derived( ctx );
+
+ /* Do all needed clipping here, so that we can forget about it later */
+ clippedPacking = *packing;
+ if (clippedPacking.RowLength == 0) {
+ clippedPacking.RowLength = width;
+ }
+ if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height,
+ &clippedPacking.SkipPixels,
+ &clippedPacking.SkipRows)) {
+ /* The ReadPixels region is totally outside the window bounds */
+ return;
+ }
+
+ if (clippedPacking.BufferObj->Name) {
+ /* pack into PBO */
+ 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)");
+ return;
+ }
+ buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ GL_WRITE_ONLY_ARB,
+ clippedPacking.BufferObj);
+ if (!buf) {
+ /* buffer is already mapped - that's an error */
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
+ return;
+ }
+ pixels = ADD_POINTERS(buf, pixels);
+ }
+
+ RENDER_START(swrast, ctx);
+
+ 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;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glReadPixels(format)" );
+ /* don't return yet, clean-up */
+ }
+
+ RENDER_FINISH(swrast, ctx);
+
+ if (clippedPacking.BufferObj->Name) {
+ /* done with PBO so unmap it now */
+ ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ clippedPacking.BufferObj);
+ }
+}
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