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- /* $Id: copypix.c,v 1.3 1996/09/15 14:18:10 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 2.0
- * Copyright (C) 1995-1996 Brian Paul
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- /*
- * $Log: copypix.c,v $
- * Revision 1.3 1996/09/15 14:18:10 brianp
- * now use GLframebuffer and GLvisual
- *
- * Revision 1.2 1996/09/15 01:48:58 brianp
- * removed #define NULL 0
- *
- * Revision 1.1 1996/09/13 01:38:16 brianp
- * Initial revision
- *
- */
-
-
- #include <string.h>
- #include "context.h"
- #include "copypix.h"
- #include "depth.h"
- #include "feedback.h"
- #include "dlist.h"
- #include "macros.h"
- #include "pixel.h"
- #include "span.h"
- #include "stencil.h"
- #include "types.h"
-
-
-
-
- static void copy_rgb_pixels( GLcontext* ctx,
- GLint srcx, GLint srcy, GLint width, GLint height,
- GLint destx, GLint desty )
- {
- DEFARRAY( GLdepth, zspan, MAX_WIDTH );
- DEFARRAY( GLubyte, red, MAX_WIDTH );
- DEFARRAY( GLubyte, green, MAX_WIDTH );
- DEFARRAY( GLubyte, blue, MAX_WIDTH );
- DEFARRAY( GLubyte, alpha, MAX_WIDTH );
- GLboolean scale_or_bias, quick_draw, zoom;
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean setbuffer;
-
- if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
- zoom = GL_FALSE;
- }
- else {
- zoom = GL_TRUE;
- }
-
- /* 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;
- }
-
- scale_or_bias = ctx->Pixel.RedScale!=1.0 || ctx->Pixel.RedBias!=0.0
- || ctx->Pixel.GreenScale!=1.0 || ctx->Pixel.GreenBias!=0.0
- || ctx->Pixel.BlueScale!=1.0 || ctx->Pixel.BlueBias!=0.0
- || ctx->Pixel.AlphaScale!=1.0 || ctx->Pixel.AlphaBias!=0.0;
-
- if (ctx->Depth.Test) {
- /* fill in array of z values */
- GLint z = (GLint) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
- for (i=0;i<width;i++) {
- zspan[i] = z;
- }
- }
-
- if (ctx->RasterMask==0 && !zoom
- && destx>=0 && destx+width<=ctx->Buffer->Width) {
- quick_draw = GL_TRUE;
- }
- else {
- quick_draw = GL_FALSE;
- }
-
- /* If read and draw buffer are different we must do buffer switching */
- setbuffer = ctx->Pixel.ReadBuffer!=ctx->Color.DrawBuffer;
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- /* read */
-
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
- }
- gl_read_color_span( ctx, width, srcx, sy, red, green, blue, alpha );
-
- if (scale_or_bias) {
- GLfloat rbias = ctx->Pixel.RedBias * ctx->Visual->RedScale;
- GLfloat gbias = ctx->Pixel.GreenBias * ctx->Visual->GreenScale;
- GLfloat bbias = ctx->Pixel.BlueBias * ctx->Visual->BlueScale;
- GLfloat abias = ctx->Pixel.AlphaBias * ctx->Visual->AlphaScale;
- GLint rmax = (GLint) ctx->Visual->RedScale;
- GLint gmax = (GLint) ctx->Visual->GreenScale;
- GLint bmax = (GLint) ctx->Visual->BlueScale;
- GLint amax = (GLint) ctx->Visual->AlphaScale;
- for (i=0;i<width;i++) {
- GLint r = red[i] * ctx->Pixel.RedScale + rbias;
- GLint g = green[i] * ctx->Pixel.GreenScale + gbias;
- GLint b = blue[i] * ctx->Pixel.BlueScale + bbias;
- GLint a = alpha[i] * ctx->Pixel.AlphaScale + abias;
- red[i] = CLAMP( r, 0, rmax );
- green[i] = CLAMP( g, 0, gmax );
- blue[i] = CLAMP( b, 0, bmax );
- alpha[i] = CLAMP( a, 0, amax );
- }
- }
-
- if (ctx->Pixel.MapColorFlag) {
- GLfloat r = (ctx->Pixel.MapRtoRsize-1) * ctx->Visual->InvRedScale;
- GLfloat g = (ctx->Pixel.MapGtoGsize-1) * ctx->Visual->InvGreenScale;
- GLfloat b = (ctx->Pixel.MapBtoBsize-1) * ctx->Visual->InvBlueScale;
- GLfloat a = (ctx->Pixel.MapAtoAsize-1) * ctx->Visual->InvAlphaScale;
- for (i=0;i<width;i++) {
- GLint ir = red[i] * r;
- GLint ig = green[i] * g;
- GLint ib = blue[i] * b;
- GLint ia = alpha[i] * a;
- red[i] = (GLint) (ctx->Pixel.MapRtoR[ir]*ctx->Visual->RedScale);
- green[i] = (GLint) (ctx->Pixel.MapGtoG[ig]*ctx->Visual->GreenScale);
- blue[i] = (GLint) (ctx->Pixel.MapBtoB[ib]*ctx->Visual->BlueScale);
- alpha[i] = (GLint) (ctx->Pixel.MapAtoA[ia]*ctx->Visual->AlphaScale);
- }
- }
-
- /* write */
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
- }
- if (quick_draw && dy>=0 && dy<ctx->Buffer->Height) {
- (*ctx->Driver.WriteColorSpan)( ctx, width, destx, dy,
- red, green, blue, alpha, NULL);
- }
- else if (zoom) {
- gl_write_zoomed_color_span( ctx, width, destx, dy, zspan,
- red, green, blue, alpha, desty );
- }
- else {
- gl_write_color_span( ctx, width, destx, dy, zspan,
- red, green, blue, alpha, GL_BITMAP );
- }
- }
- UNDEFARRAY( zspan );
- UNDEFARRAY( red );
- UNDEFARRAY( green );
- UNDEFARRAY( blue );
- UNDEFARRAY( alpha );
- }
-
-
-
- static void copy_ci_pixels( GLcontext* ctx,
- GLint srcx, GLint srcy, GLint width, GLint height,
- GLint destx, GLint desty )
- {
- GLdepth zspan[MAX_WIDTH];
- GLuint indx[MAX_WIDTH];
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean setbuffer, zoom;
-
- if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
- zoom = GL_FALSE;
- }
- else {
- zoom = GL_TRUE;
- }
-
- /* 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;
- }
-
- if (ctx->Depth.Test) {
- /* fill in array of z values */
- GLint z = (GLint) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
- for (i=0;i<width;i++) {
- zspan[i] = z;
- }
- }
-
- /* If read and draw buffer are different we must do buffer switching */
- setbuffer = ctx->Pixel.ReadBuffer!=ctx->Color.DrawBuffer;
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- /* read */
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
- }
- gl_read_index_span( ctx, width, srcx, sy, indx );
-
- /* shift, offset */
- if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset) {
- if (ctx->Pixel.IndexShift<0) {
- for (i=0;i<width;i++) {
- indx[i] = (indx[i] >> -ctx->Pixel.IndexShift)
- + ctx->Pixel.IndexOffset;
- }
- }
- else {
- for (i=0;i<width;i++) {
- indx[i] = (indx[i] << ctx->Pixel.IndexShift)
- + ctx->Pixel.IndexOffset;
- }
- }
- }
-
- /* mapping */
- if (ctx->Pixel.MapColorFlag) {
- for (i=0;i<width;i++) {
- if (indx[i] < ctx->Pixel.MapItoIsize) {
- indx[i] = ctx->Pixel.MapItoI[ indx[i] ];
- }
- }
- }
-
- /* write */
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
- }
- if (zoom) {
- gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, indx, desty );
- }
- else {
- gl_write_index_span( ctx, width, destx, dy, zspan, indx, GL_BITMAP );
- }
- }
- }
-
-
-
- /*
- * 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];
- GLuint indx[MAX_WIDTH];
- GLubyte red[MAX_WIDTH], green[MAX_WIDTH];
- GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH];
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean zoom;
-
- if (!ctx->Buffer->Depth) {
- gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
- return;
- }
-
- if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
- zoom = GL_FALSE;
- }
- else {
- zoom = GL_TRUE;
- }
-
- /* 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;
- }
-
- /* setup colors or indexes */
- if (ctx->Visual->RGBAflag) {
- GLubyte r, g, b, a;
- r = ctx->Current.IntColor[0];
- g = ctx->Current.IntColor[1];
- b = ctx->Current.IntColor[2];
- a = ctx->Current.IntColor[3];
- MEMSET( red, (int) r, width );
- MEMSET( green, (int) g, width );
- MEMSET( blue, (int) b, width );
- MEMSET( alpha, (int) a, width );
- }
- else {
- for (i=0;i<width;i++) {
- indx[i] = ctx->Current.Index;
- }
- }
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- /* read */
- (*ctx->Driver.ReadDepthSpanFloat)( ctx, width, srcx, sy, depth );
- /* scale, bias, clamp */
- for (i=0;i<width;i++) {
- GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
- zspan[i] = (GLint) (CLAMP( d, 0.0, 1.0 ) * DEPTH_SCALE);
- }
- /* write */
- if (ctx->Visual->RGBAflag) {
- if (zoom) {
- gl_write_zoomed_color_span( ctx, width, destx, dy, zspan,
- red, green, blue, alpha, desty );
- }
- else {
- gl_write_color_span( ctx, width, destx, dy, zspan,
- red, green, blue, alpha, GL_BITMAP );
- }
- }
- else {
- if (zoom) {
- gl_write_zoomed_index_span( ctx, width, destx, dy,
- zspan, indx, desty);
- }
- else {
- gl_write_index_span( ctx, width, destx, dy,
- zspan, indx, GL_BITMAP );
- }
- }
- }
- }
-
-
-
- static void copy_stencil_pixels( GLcontext* ctx, GLint srcx, GLint srcy,
- GLint width, GLint height,
- GLint destx, GLint desty )
- {
- GLubyte stencil[MAX_WIDTH];
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean zoom;
-
- if (!ctx->Buffer->Stencil) {
- gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
- return;
- }
-
- if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
- zoom = GL_FALSE;
- }
- else {
- zoom = GL_TRUE;
- }
-
- /* 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;
- }
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- /* read */
- gl_read_stencil_span( ctx, width, srcx, sy, stencil );
- /* shift, offset */
- if (ctx->Pixel.IndexShift<0) {
- for (i=0;i<width;i++) {
- stencil[i] = (stencil[i] >> -ctx->Pixel.IndexShift)
- + ctx->Pixel.IndexOffset;
- }
- }
- else {
- for (i=0;i<width;i++) {
- stencil[i] = (stencil[i] << ctx->Pixel.IndexShift)
- + ctx->Pixel.IndexOffset;
- }
- }
- /* mapping */
- if (ctx->Pixel.MapStencilFlag) {
- for (i=0;i<width;i++) {
- if ((GLint) stencil[i] < ctx->Pixel.MapStoSsize) {
- stencil[i] = ctx->Pixel.MapStoS[ stencil[i] ];
- }
- }
- }
- /* write */
- if (zoom) {
- gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
- }
- else {
- gl_write_stencil_span( ctx, width, destx, dy, stencil );
- }
- }
- }
-
-
-
-
- void gl_CopyPixels( GLcontext* ctx, GLint srcx, GLint srcy, GLsizei width, GLsizei height,
- GLenum type )
- {
- GLint destx, desty;
-
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
- return;
- }
-
- if (width<0 || height<0) {
- gl_error( ctx, GL_INVALID_VALUE, "glCopyPixels" );
- return;
- }
-
- if (ctx->NewState) {
- gl_update_state(ctx);
- }
-
- if (ctx->RenderMode==GL_RENDER) {
- /* Destination of copy: */
- if (!ctx->Current.RasterPosValid) {
- return;
- }
- destx = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
- desty = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
-
- if (type==GL_COLOR && ctx->Visual->RGBAflag) {
- copy_rgb_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" );
- }
- }
- else if (ctx->RenderMode==GL_FEEDBACK) {
- GLfloat color[4];
- color[0] = ctx->Current.IntColor[0] * ctx->Visual->InvRedScale;
- color[1] = ctx->Current.IntColor[1] * ctx->Visual->InvGreenScale;
- color[2] = ctx->Current.IntColor[2] * ctx->Visual->InvBlueScale;
- color[3] = ctx->Current.IntColor[3] * ctx->Visual->InvAlphaScale;
- FEEDBACK_TOKEN( ctx, (GLfloat) GL_COPY_PIXEL_TOKEN );
- gl_feedback_vertex( ctx, ctx->Current.RasterPos[0],
- ctx->Current.RasterPos[1],
- ctx->Current.RasterPos[2],
- ctx->Current.RasterPos[3],
- color, ctx->Current.Index,
- ctx->Current.TexCoord );
- }
- else if (ctx->RenderMode==GL_SELECT) {
- gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
- }
-
- }
-
-
-