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Diffstat (limited to 'src/mesa/swrast/s_copypix.c')
-rw-r--r--src/mesa/swrast/s_copypix.c821
1 files changed, 821 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_copypix.c b/src/mesa/swrast/s_copypix.c
new file mode 100644
index 0000000000..eddfe39037
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+++ b/src/mesa/swrast/s_copypix.c
@@ -0,0 +1,821 @@
+/* $Id: s_copypix.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.5
+ *
+ * Copyright (C) 1999-2000 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 "colormac.h"
+#include "context.h"
+#include "convolve.h"
+#include "feedback.h"
+#include "macros.h"
+#include "mem.h"
+#include "mmath.h"
+#include "pixel.h"
+
+#include "s_depth.h"
+#include "s_imaging.h"
+#include "s_pixeltex.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_texture.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Determine if there's overlap in an image copy
+ */
+static GLboolean
+regions_overlap(int srcx, int srcy, int dstx, int dsty, int width, int height,
+ float zoomX, float zoomY)
+{
+ if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
+ return GL_FALSE;
+ }
+ else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
+ return GL_FALSE;
+ }
+ else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
+ return GL_FALSE;
+ }
+ else {
+ return GL_TRUE;
+ }
+}
+
+
+
+/*
+ * RGBA copypixels with convolution.
+ */
+static void
+copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height, GLint destx, GLint desty)
+{
+ GLdepth zspan[MAX_WIDTH];
+ GLboolean quick_draw;
+ GLint row;
+ GLboolean changeBuffer;
+ GLchan *saveReadAlpha;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLuint transferOps = ctx->ImageTransferState;
+ GLfloat *dest, *tmpImage, *convImage;
+
+ if (ctx->Depth.Test || ctx->Fog.Enabled) {
+ /* fill in array of z values */
+ GLdepth z = (GLdepth)
+ (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+ GLint i;
+ for (i = 0; i < width; i++) {
+ zspan[i] = z;
+ }
+ }
+
+ if (ctx->RasterMask == 0
+ && !zoom
+ && destx >= 0
+ && destx + width <= ctx->DrawBuffer->Width) {
+ quick_draw = GL_TRUE;
+ }
+ else {
+ quick_draw = GL_FALSE;
+ }
+
+ /* If read and draw buffer are different we must do buffer switching */
+ saveReadAlpha = ctx->ReadBuffer->Alpha;
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+
+ /* allocate space for GLfloat image */
+ tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+ if (!tmpImage) {
+ gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+ return;
+ }
+ convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+ if (!convImage) {
+ FREE(tmpImage);
+ gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+ return;
+ }
+
+ dest = tmpImage;
+
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+ ctx->Pixel.DriverReadBuffer );
+ if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+ else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+ else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+ else
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+ }
+
+ /* read source image */
+ dest = tmpImage;
+ for (row = 0; row < height; row++) {
+ GLchan rgba[MAX_WIDTH][4];
+ GLint i;
+ gl_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
+ /* convert GLchan to GLfloat */
+ for (i = 0; i < width; i++) {
+ *dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
+ *dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
+ *dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
+ *dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
+ }
+ }
+
+ /* read from the draw buffer again (in case of blending) */
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+ ctx->Color.DriverDrawBuffer );
+ ctx->ReadBuffer->Alpha = saveReadAlpha;
+ }
+
+ /* do image transfer ops up until convolution */
+ for (row = 0; row < height; row++) {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
+
+ /* scale & bias */
+ if (transferOps & IMAGE_SCALE_BIAS_BIT) {
+ _mesa_scale_and_bias_rgba(ctx, width, rgba);
+ }
+ /* color map lookup */
+ if (transferOps & IMAGE_MAP_COLOR_BIT) {
+ _mesa_map_rgba(ctx, width, rgba);
+ }
+ /* GL_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
+ }
+ }
+
+ /* do convolution */
+ 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);
+ }
+ FREE(tmpImage);
+
+ /* do remaining image transfer ops */
+ for (row = 0; row < height; row++) {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
+
+ /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
+ }
+ /* color matrix */
+ if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
+ _mesa_transform_rgba(ctx, width, rgba);
+ }
+ /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
+ }
+ /* update histogram count */
+ if (transferOps & IMAGE_HISTOGRAM_BIT) {
+ _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
+ }
+ /* update min/max */
+ if (transferOps & IMAGE_MIN_MAX_BIT) {
+ _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
+ }
+ }
+
+ for (row = 0; row < height; row++) {
+ const GLfloat *src = convImage + row * width * 4;
+ GLchan rgba[MAX_WIDTH][4];
+ GLint i, dy;
+
+ /* clamp to [0,1] and convert float back to chan */
+ for (i = 0; i < width; i++) {
+ GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
+ GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
+ GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
+ GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+ }
+
+ if (ctx->Texture.ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
+ GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
+ GLchan primary_rgba[MAX_WIDTH][4];
+ GLuint unit;
+ /* XXX not sure how multitexture is supposed to work here */
+
+ MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
+
+ for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
+ _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
+ s, t, r, q);
+ gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
+ primary_rgba, rgba);
+ }
+ }
+
+ /* write row to framebuffer */
+
+ dy = desty + row;
+ if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
+ (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
+ (const GLchan (*)[4])rgba, NULL );
+ }
+ else if (zoom) {
+ gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
+ (const GLchan (*)[4])rgba, desty);
+ }
+ else {
+ gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
+ }
+ }
+
+ FREE(convImage);
+}
+
+
+/*
+ * RGBA copypixels
+ */
+static void
+copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height, GLint destx, GLint desty)
+{
+ GLdepth zspan[MAX_WIDTH];
+ GLchan rgba[MAX_WIDTH][4];
+ GLchan *tmpImage,*p;
+ GLboolean quick_draw;
+ GLint sy, dy, stepy;
+ GLint i, j;
+ GLboolean changeBuffer;
+ GLchan *saveReadAlpha;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ GLint overlapping;
+ const GLuint transferOps = ctx->ImageTransferState;
+
+ if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+ copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
+ return;
+ }
+
+ /* Determine if copy should be done bottom-to-top or top-to-bottom */
+ if (srcy < desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+ if (ctx->Depth.Test || ctx->Fog.Enabled) {
+ /* fill in array of z values */
+ GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+ for (i=0;i<width;i++) {
+ zspan[i] = z;
+ }
+ }
+
+ if (ctx->RasterMask == 0
+ && !zoom
+ && destx >= 0
+ && destx + width <= ctx->DrawBuffer->Width) {
+ quick_draw = GL_TRUE;
+ }
+ else {
+ quick_draw = GL_FALSE;
+ }
+
+ /* If read and draw buffer are different we must do buffer switching */
+ saveReadAlpha = ctx->ReadBuffer->Alpha;
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
+ if (!tmpImage) {
+ gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+ ctx->Pixel.DriverReadBuffer );
+ if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+ else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+ else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+ else
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+ }
+ for (j = 0; j < height; j++, ssy += stepy) {
+ gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
+ (GLchan (*)[4]) p );
+ p += (width * sizeof(GLchan) * 4);
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warnings */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ /* Get source pixels */
+ if (overlapping) {
+ /* get from buffered image */
+ MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
+ p += (width * sizeof(GLchan) * 4);
+ }
+ else {
+ /* get from framebuffer */
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+ ctx->Pixel.DriverReadBuffer );
+ if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+ }
+ else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+ }
+ else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+ }
+ else {
+ ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+ }
+ }
+ gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
+ }
+
+ if (changeBuffer) {
+ /* read from the draw buffer again (in case of blending) */
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+ ctx->Color.DriverDrawBuffer );
+ ctx->ReadBuffer->Alpha = saveReadAlpha;
+ }
+
+ if (transferOps) {
+ const GLfloat scale = (1.0F / CHAN_MAXF);
+ GLfloat rgbaFloat[MAX_WIDTH][4];
+ GLuint k;
+ /* convert chan to float */
+ for (k = 0; k < width; k++) {
+ rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
+ rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
+ rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
+ rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
+ }
+ /* scale & bias */
+ if (transferOps & IMAGE_SCALE_BIAS_BIT) {
+ _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat);
+ }
+ /* color map lookup */
+ if (transferOps & IMAGE_MAP_COLOR_BIT) {
+ _mesa_map_rgba(ctx, width, rgbaFloat);
+ }
+ /* GL_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
+ }
+ /* convolution */
+ if (transferOps & IMAGE_CONVOLUTION_BIT) {
+ /* XXX to do */
+ }
+ /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
+ }
+ /* color matrix */
+ if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
+ _mesa_transform_rgba(ctx, width, rgbaFloat);
+ }
+ /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
+ if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
+ _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
+ }
+ /* update histogram count */
+ if (transferOps & IMAGE_HISTOGRAM_BIT) {
+ _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
+ }
+ /* update min/max */
+ if (transferOps & IMAGE_MIN_MAX_BIT) {
+ _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
+ }
+ /* clamp to [0,1] and convert float back to chan */
+ for (k = 0; k < width; k++) {
+ GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
+ GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
+ GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
+ GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
+ rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+ rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+ }
+ }
+
+ if (ctx->Texture.ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
+ GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
+ GLchan primary_rgba[MAX_WIDTH][4];
+ GLuint unit;
+ /* XXX not sure how multitexture is supposed to work here */
+
+ MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
+
+ for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
+ _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
+ s, t, r, q);
+ gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
+ primary_rgba, rgba);
+ }
+ }
+
+ if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
+ (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
+ (const GLchan (*)[4])rgba, NULL );
+ }
+ else if (zoom) {
+ gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
+ (const GLchan (*)[4])rgba, desty);
+ }
+ else {
+ gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+static void copy_ci_pixels( GLcontext *ctx,
+ GLint srcx, GLint srcy, GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ GLdepth zspan[MAX_WIDTH];
+ GLuint *tmpImage,*p;
+ GLint sy, dy, stepy;
+ GLint i, j;
+ GLboolean changeBuffer;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+ GLint overlapping;
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy<desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+ if (ctx->Depth.Test || ctx->Fog.Enabled) {
+ /* fill in array of z values */
+ GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+ for (i=0;i<width;i++) {
+ zspan[i] = z;
+ }
+ }
+
+ /* If read and draw buffer are different we must do buffer switching */
+ changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+ || ctx->DrawBuffer != ctx->ReadBuffer;
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
+ if (!tmpImage) {
+ gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+ ctx->Pixel.DriverReadBuffer );
+ }
+ for (j = 0; j < height; j++, ssy += stepy) {
+ gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
+ p += width;
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ GLuint indexes[MAX_WIDTH];
+ if (overlapping) {
+ MEMCPY(indexes, p, width * sizeof(GLuint));
+ p += width;
+ }
+ else {
+ if (changeBuffer) {
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+ ctx->Pixel.DriverReadBuffer );
+ }
+ gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
+ }
+
+ if (changeBuffer) {
+ /* set read buffer back to draw buffer (in case of logicops) */
+ (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+ ctx->Color.DriverDrawBuffer );
+ }
+
+ if (shift_or_offset) {
+ _mesa_shift_and_offset_ci( ctx, width, indexes );
+ }
+ if (ctx->Pixel.MapColorFlag) {
+ _mesa_map_ci( ctx, width, indexes );
+ }
+
+ if (zoom) {
+ gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
+ }
+ else {
+ gl_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+/*
+ * TODO: Optimize!!!!
+ */
+static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ GLfloat depth[MAX_WIDTH];
+ GLdepth zspan[MAX_WIDTH];
+ GLfloat *p, *tmpImage;
+ GLuint indexes[MAX_WIDTH];
+ GLchan rgba[MAX_WIDTH][4];
+ GLint sy, dy, stepy;
+ GLint i, j;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ GLint overlapping;
+
+ if (!ctx->ReadBuffer->DepthBuffer || !ctx->DrawBuffer->DepthBuffer) {
+ gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+ return;
+ }
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy<desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+ /* setup colors or indexes */
+ if (ctx->Visual.RGBAflag) {
+ GLuint *rgba32 = (GLuint *) rgba;
+ GLuint color = *(GLuint*)( ctx->Current.Color );
+ for (i = 0; i < width; i++) {
+ rgba32[i] = color;
+ }
+ }
+ else {
+ for (i = 0; i < width; i++) {
+ indexes[i] = ctx->Current.Index;
+ }
+ }
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
+ if (!tmpImage) {
+ gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
+ p += width;
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ if (overlapping) {
+ MEMCPY(depth, p, width * sizeof(GLfloat));
+ p += width;
+ }
+ else {
+ _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
+ }
+
+ for (i = 0; i < width; i++) {
+ GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+ zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->Visual.DepthMax);
+ }
+
+ if (ctx->Visual.RGBAflag) {
+ if (zoom) {
+ gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
+ (const GLchan (*)[4])rgba, desty );
+ }
+ else {
+ gl_write_rgba_span( ctx, width, destx, dy, zspan, 0,
+ rgba, GL_BITMAP);
+ }
+ }
+ else {
+ if (zoom) {
+ gl_write_zoomed_index_span( ctx, width, destx, dy,
+ zspan, 0, indexes, desty );
+ }
+ else {
+ gl_write_index_span( ctx, width, destx, dy,
+ zspan, 0, indexes, GL_BITMAP );
+ }
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+ GLint width, GLint height,
+ GLint destx, GLint desty )
+{
+ GLint sy, dy, stepy;
+ GLint j;
+ GLstencil *p, *tmpImage;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+ const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+ GLint overlapping;
+
+ if (!ctx->DrawBuffer->Stencil || !ctx->ReadBuffer->Stencil) {
+ gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+ return;
+ }
+
+ /* Determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcy < desty) {
+ /* top-down max-to-min */
+ sy = srcy + height - 1;
+ dy = desty + height - 1;
+ stepy = -1;
+ }
+ else {
+ /* bottom-up min-to-max */
+ sy = srcy;
+ dy = desty;
+ stepy = 1;
+ }
+
+ overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+ ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+ if (overlapping) {
+ GLint ssy = sy;
+ tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
+ if (!tmpImage) {
+ gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+ return;
+ }
+ p = tmpImage;
+ for (j = 0; j < height; j++, ssy += stepy) {
+ _mesa_read_stencil_span( ctx, width, srcx, ssy, p );
+ p += width;
+ }
+ p = tmpImage;
+ }
+ else {
+ tmpImage = NULL; /* silence compiler warning */
+ p = NULL;
+ }
+
+ for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+ GLstencil stencil[MAX_WIDTH];
+
+ if (overlapping) {
+ MEMCPY(stencil, p, width * sizeof(GLstencil));
+ p += width;
+ }
+ else {
+ _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
+ }
+
+ if (shift_or_offset) {
+ _mesa_shift_and_offset_stencil( ctx, width, stencil );
+ }
+ if (ctx->Pixel.MapStencilFlag) {
+ _mesa_map_stencil( ctx, width, stencil );
+ }
+
+ if (zoom) {
+ gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
+ }
+ else {
+ _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
+ }
+ }
+
+ if (overlapping)
+ FREE(tmpImage);
+}
+
+
+
+
+void
+_swrast_CopyPixels( GLcontext *ctx,
+ GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+ GLint destx, GLint desty,
+ GLenum type )
+{
+ if (type == GL_COLOR && ctx->Visual.RGBAflag) {
+ copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_COLOR && !ctx->Visual.RGBAflag) {
+ copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_DEPTH) {
+ copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else if (type == GL_STENCIL) {
+ copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+ }
+ else {
+ gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-27 18:38:53 +0000