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616 lines
17 KiB
C
616 lines
17 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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/**
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* Determine if there's overlap in an image copy.
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* This test also compensates for the fact that copies are done from
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* bottom to top and overlaps can sometimes be handled correctly
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* without making a temporary image copy.
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* \return GL_TRUE if the regions overlap, GL_FALSE otherwise.
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*/
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static GLboolean
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regions_overlap(GLint srcx, GLint srcy,
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GLint dstx, GLint dsty,
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GLint width, GLint height,
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GLfloat zoomX, GLfloat zoomY)
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{
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if (zoomX == 1.0 && zoomY == 1.0) {
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/* no zoom */
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if (srcx >= dstx + width || (srcx + width <= dstx)) {
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return GL_FALSE;
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}
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else if (srcy < dsty) { /* this is OK */
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return GL_FALSE;
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}
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else if (srcy > dsty + height) {
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return GL_FALSE;
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}
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else {
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return GL_TRUE;
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}
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}
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else {
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/* add one pixel of slop when zooming, just to be safe */
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if (srcx > (dstx + ((zoomX > 0.0F) ? (width * zoomX + 1.0F) : 0.0F))) {
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/* src is completely right of dest */
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return GL_FALSE;
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}
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else if (srcx + width + 1.0F < dstx + ((zoomX > 0.0F) ? 0.0F : (width * zoomX))) {
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/* src is completely left of dest */
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return GL_FALSE;
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}
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else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
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/* src is completely below dest */
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return GL_FALSE;
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}
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else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
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/* src is completely above dest */
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return GL_FALSE;
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}
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else {
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return GL_TRUE;
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}
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}
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}
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/**
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* RGBA copypixels
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*/
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static void
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copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
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GLint width, GLint height, GLint destx, GLint desty)
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{
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GLfloat *tmpImage, *p;
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GLint sy, dy, stepy, row;
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const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
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GLint overlapping;
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GLuint transferOps = ctx->_ImageTransferState;
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SWspan span;
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if (!ctx->ReadBuffer->_ColorReadBuffer) {
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/* no readbuffer - OK */
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return;
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}
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if (ctx->DrawBuffer == ctx->ReadBuffer) {
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overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
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ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
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}
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else {
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overlapping = GL_FALSE;
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}
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/* Determine if copy should be done bottom-to-top or top-to-bottom */
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if (!overlapping && srcy < desty) {
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/* top-down max-to-min */
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sy = srcy + height - 1;
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dy = desty + height - 1;
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stepy = -1;
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}
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else {
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/* bottom-up min-to-max */
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sy = srcy;
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dy = desty;
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stepy = 1;
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}
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INIT_SPAN(span, GL_BITMAP);
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_swrast_span_default_attribs(ctx, &span);
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span.arrayMask = SPAN_RGBA;
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span.arrayAttribs = FRAG_BIT_COL; /* we'll fill in COL0 attrib values */
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if (overlapping) {
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tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat) * 4);
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if (!tmpImage) {
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_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
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return;
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}
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/* read the source image as RGBA/float */
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p = tmpImage;
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for (row = 0; row < height; row++) {
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_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
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width, srcx, sy + row, p );
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p += width * 4;
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}
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p = tmpImage;
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}
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else {
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tmpImage = NULL; /* silence compiler warnings */
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p = NULL;
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}
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ASSERT(width < MAX_WIDTH);
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for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
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GLvoid *rgba = span.array->attribs[FRAG_ATTRIB_COL];
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/* Get row/span of source pixels */
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if (overlapping) {
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/* get from buffered image */
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memcpy(rgba, p, width * sizeof(GLfloat) * 4);
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p += width * 4;
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}
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else {
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/* get from framebuffer */
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_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
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width, srcx, sy, rgba );
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}
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if (transferOps) {
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_mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
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(GLfloat (*)[4]) rgba);
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}
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/* Write color span */
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span.x = destx;
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span.y = dy;
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span.end = width;
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span.array->ChanType = GL_FLOAT;
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if (zoom) {
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_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
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}
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else {
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_swrast_write_rgba_span(ctx, &span);
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}
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}
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span.array->ChanType = CHAN_TYPE; /* restore */
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if (overlapping)
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free(tmpImage);
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}
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/**
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* Convert floating point Z values to integer Z values with pixel transfer's
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* Z scale and bias.
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*/
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static void
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scale_and_bias_z(struct gl_context *ctx, GLuint width,
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const GLfloat depth[], GLuint z[])
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{
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const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
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GLuint i;
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if (depthMax <= 0xffffff &&
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ctx->Pixel.DepthScale == 1.0 &&
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ctx->Pixel.DepthBias == 0.0) {
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/* no scale or bias and no clamping and no worry of overflow */
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const GLfloat depthMaxF = ctx->DrawBuffer->_DepthMaxF;
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for (i = 0; i < width; i++) {
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z[i] = (GLuint) (depth[i] * depthMaxF);
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}
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}
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else {
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/* need to be careful with overflow */
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const GLdouble depthMaxF = ctx->DrawBuffer->_DepthMaxF;
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for (i = 0; i < width; i++) {
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GLdouble d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
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d = CLAMP(d, 0.0, 1.0) * depthMaxF;
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if (d >= depthMaxF)
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z[i] = depthMax;
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else
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z[i] = (GLuint) d;
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}
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}
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}
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/*
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* TODO: Optimize!!!!
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*/
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static void
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copy_depth_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
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GLint width, GLint height,
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GLint destx, GLint desty )
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{
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struct gl_framebuffer *fb = ctx->ReadBuffer;
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struct gl_renderbuffer *readRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
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GLfloat *p, *tmpImage;
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GLint sy, dy, stepy;
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GLint j;
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const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
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GLint overlapping;
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SWspan span;
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if (!readRb) {
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/* no readbuffer - OK */
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return;
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}
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INIT_SPAN(span, GL_BITMAP);
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_swrast_span_default_attribs(ctx, &span);
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span.arrayMask = SPAN_Z;
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if (ctx->DrawBuffer == ctx->ReadBuffer) {
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overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
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ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
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}
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else {
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overlapping = GL_FALSE;
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}
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/* Determine if copy should be bottom-to-top or top-to-bottom */
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if (!overlapping && srcy < desty) {
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/* top-down max-to-min */
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sy = srcy + height - 1;
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dy = desty + height - 1;
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stepy = -1;
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}
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else {
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/* bottom-up min-to-max */
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sy = srcy;
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dy = desty;
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stepy = 1;
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}
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if (overlapping) {
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GLint ssy = sy;
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tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat));
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if (!tmpImage) {
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_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
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return;
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}
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p = tmpImage;
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for (j = 0; j < height; j++, ssy += stepy) {
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_swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
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p += width;
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}
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p = tmpImage;
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}
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else {
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tmpImage = NULL; /* silence compiler warning */
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p = NULL;
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}
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for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
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GLfloat depth[MAX_WIDTH];
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/* get depth values */
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if (overlapping) {
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memcpy(depth, p, width * sizeof(GLfloat));
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p += width;
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}
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else {
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_swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
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}
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/* apply scale and bias */
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scale_and_bias_z(ctx, width, depth, span.array->z);
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/* write depth values */
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span.x = destx;
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span.y = dy;
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span.end = width;
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if (zoom)
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_swrast_write_zoomed_depth_span(ctx, destx, desty, &span);
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else
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_swrast_write_rgba_span(ctx, &span);
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}
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if (overlapping)
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free(tmpImage);
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}
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static void
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copy_stencil_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
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GLint width, GLint height,
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GLint destx, GLint desty )
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{
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struct gl_framebuffer *fb = ctx->ReadBuffer;
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struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
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GLint sy, dy, stepy;
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GLint j;
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GLubyte *p, *tmpImage;
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const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
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GLint overlapping;
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if (!rb) {
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/* no readbuffer - OK */
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return;
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}
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if (ctx->DrawBuffer == ctx->ReadBuffer) {
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overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
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ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
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}
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else {
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overlapping = GL_FALSE;
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}
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/* Determine if copy should be bottom-to-top or top-to-bottom */
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if (!overlapping && srcy < desty) {
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/* top-down max-to-min */
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sy = srcy + height - 1;
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dy = desty + height - 1;
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stepy = -1;
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}
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else {
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/* bottom-up min-to-max */
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sy = srcy;
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dy = desty;
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stepy = 1;
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}
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if (overlapping) {
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GLint ssy = sy;
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tmpImage = (GLubyte *) malloc(width * height * sizeof(GLubyte));
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if (!tmpImage) {
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_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
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return;
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}
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p = tmpImage;
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for (j = 0; j < height; j++, ssy += stepy) {
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_swrast_read_stencil_span( ctx, rb, width, srcx, ssy, p );
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p += width;
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}
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p = tmpImage;
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}
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else {
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tmpImage = NULL; /* silence compiler warning */
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p = NULL;
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}
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for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
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GLubyte stencil[MAX_WIDTH];
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/* Get stencil values */
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if (overlapping) {
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memcpy(stencil, p, width * sizeof(GLubyte));
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p += width;
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}
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else {
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_swrast_read_stencil_span( ctx, rb, width, srcx, sy, stencil );
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}
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_mesa_apply_stencil_transfer_ops(ctx, width, stencil);
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/* Write stencil values */
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if (zoom) {
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_swrast_write_zoomed_stencil_span(ctx, destx, desty, width,
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destx, dy, stencil);
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}
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else {
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_swrast_write_stencil_span( ctx, width, destx, dy, stencil );
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}
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}
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if (overlapping)
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free(tmpImage);
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}
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/**
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* Try to do a fast 1:1 blit with memcpy.
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* \return GL_TRUE if successful, GL_FALSE otherwise.
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*/
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GLboolean
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swrast_fast_copy_pixels(struct gl_context *ctx,
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GLint srcX, GLint srcY, GLsizei width, GLsizei height,
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GLint dstX, GLint dstY, GLenum type)
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{
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struct gl_framebuffer *srcFb = ctx->ReadBuffer;
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struct gl_framebuffer *dstFb = ctx->DrawBuffer;
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struct gl_renderbuffer *srcRb, *dstRb;
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GLint row;
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GLuint pixelBytes, widthInBytes;
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GLubyte *srcMap, *dstMap;
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GLint srcRowStride, dstRowStride;
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if (type == GL_COLOR) {
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srcRb = srcFb->_ColorReadBuffer;
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dstRb = dstFb->_ColorDrawBuffer;
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}
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else if (type == GL_STENCIL) {
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srcRb = srcFb->Attachment[BUFFER_STENCIL].Renderbuffer;
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dstRb = dstFb->Attachment[BUFFER_STENCIL].Renderbuffer;
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}
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else if (type == GL_DEPTH) {
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srcRb = srcFb->Attachment[BUFFER_DEPTH].Renderbuffer;
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dstRb = dstFb->Attachment[BUFFER_DEPTH].Renderbuffer;
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}
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/* src and dst renderbuffers must be same format */
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if (!srcRb || !dstRb || srcRb->Format != dstRb->Format) {
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return GL_FALSE;
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}
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/* clipping not supported */
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if (srcX < 0 || srcX + width > (GLint) srcFb->Width ||
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srcY < 0 || srcY + height > (GLint) srcFb->Height ||
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dstX < dstFb->_Xmin || dstX + width > dstFb->_Xmax ||
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dstY < dstFb->_Ymin || dstY + height > dstFb->_Ymax) {
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return GL_FALSE;
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}
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pixelBytes = _mesa_get_format_bytes(srcRb->Format);
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widthInBytes = width * pixelBytes;
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if (srcRb == dstRb) {
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/* map whole buffer for read/write */
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/* XXX we could be clever and just map the union region of the
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* source and dest rects.
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*/
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GLubyte *map;
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GLint rowStride;
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ctx->Driver.MapRenderbuffer(ctx, srcRb, 0, 0,
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srcRb->Width, srcRb->Height,
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GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
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&map, &rowStride);
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if (!map) {
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_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
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return GL_TRUE; /* don't retry with slow path */
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}
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srcMap = map + srcY * rowStride + srcX * pixelBytes;
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dstMap = map + dstY * rowStride + dstX * pixelBytes;
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/* this handles overlapping copies */
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if (srcY < dstY) {
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/* copy in reverse (top->down) order */
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srcMap += rowStride * (height - 1);
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dstMap += rowStride * (height - 1);
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srcRowStride = -rowStride;
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dstRowStride = -rowStride;
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}
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else {
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/* copy in normal (bottom->up) order */
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srcRowStride = rowStride;
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dstRowStride = rowStride;
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}
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}
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else {
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/* different src/dst buffers */
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ctx->Driver.MapRenderbuffer(ctx, srcRb, srcX, srcY,
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width, height,
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GL_MAP_READ_BIT, &srcMap, &srcRowStride);
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if (!srcMap) {
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_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
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return GL_TRUE; /* don't retry with slow path */
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}
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ctx->Driver.MapRenderbuffer(ctx, dstRb, dstX, dstY,
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width, height,
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GL_MAP_WRITE_BIT, &dstMap, &dstRowStride);
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if (!dstMap) {
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ctx->Driver.UnmapRenderbuffer(ctx, srcRb);
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_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
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return GL_TRUE; /* don't retry with slow path */
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}
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}
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for (row = 0; row < height; row++) {
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/* memmove() in case of overlap */
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memmove(dstMap, srcMap, widthInBytes);
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dstMap += dstRowStride;
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srcMap += srcRowStride;
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}
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ctx->Driver.UnmapRenderbuffer(ctx, srcRb);
|
|
if (dstRb != srcRb) {
|
|
ctx->Driver.UnmapRenderbuffer(ctx, dstRb);
|
|
}
|
|
|
|
return GL_TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* Find/map the renderbuffer that we'll be reading from.
|
|
* The swrast_render_start() function only maps the drawing buffers,
|
|
* not the read buffer.
|
|
*/
|
|
static struct gl_renderbuffer *
|
|
map_readbuffer(struct gl_context *ctx, GLenum type)
|
|
{
|
|
struct gl_framebuffer *fb = ctx->ReadBuffer;
|
|
struct gl_renderbuffer *rb;
|
|
struct swrast_renderbuffer *srb;
|
|
|
|
switch (type) {
|
|
case GL_COLOR:
|
|
rb = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer;
|
|
break;
|
|
case GL_DEPTH:
|
|
rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
|
|
break;
|
|
case GL_STENCIL:
|
|
rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
srb = swrast_renderbuffer(rb);
|
|
|
|
if (!srb || srb->Map) {
|
|
/* no buffer, or buffer is mapped already, we're done */
|
|
return NULL;
|
|
}
|
|
|
|
ctx->Driver.MapRenderbuffer(ctx, rb,
|
|
0, 0, rb->Width, rb->Height,
|
|
GL_MAP_READ_BIT,
|
|
&srb->Map, &srb->RowStride);
|
|
|
|
return rb;
|
|
}
|
|
|
|
|
|
/**
|
|
* Do software-based glCopyPixels.
|
|
* By time we get here, all parameters will have been error-checked.
|
|
*/
|
|
void
|
|
_swrast_CopyPixels( struct gl_context *ctx,
|
|
GLint srcx, GLint srcy, GLsizei width, GLsizei height,
|
|
GLint destx, GLint desty, GLenum type )
|
|
{
|
|
SWcontext *swrast = SWRAST_CONTEXT(ctx);
|
|
struct gl_renderbuffer *rb;
|
|
|
|
if (swrast->NewState)
|
|
_swrast_validate_derived( ctx );
|
|
|
|
if (!(SWRAST_CONTEXT(ctx)->_RasterMask != 0x0 ||
|
|
ctx->Pixel.ZoomX != 1.0F ||
|
|
ctx->Pixel.ZoomY != 1.0F ||
|
|
ctx->_ImageTransferState) &&
|
|
swrast_fast_copy_pixels(ctx, srcx, srcy, width, height, destx, desty,
|
|
type)) {
|
|
/* all done */
|
|
return;
|
|
}
|
|
|
|
swrast_render_start(ctx);
|
|
rb = map_readbuffer(ctx, type);
|
|
|
|
switch (type) {
|
|
case GL_COLOR:
|
|
copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
|
|
break;
|
|
case GL_DEPTH:
|
|
copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
|
|
break;
|
|
case GL_STENCIL:
|
|
copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
|
|
break;
|
|
default:
|
|
_mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
|
|
}
|
|
|
|
swrast_render_finish(ctx);
|
|
|
|
if (rb) {
|
|
struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
|
|
ctx->Driver.UnmapRenderbuffer(ctx, rb);
|
|
srb->Map = NULL;
|
|
}
|
|
}
|