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- /* $Id: copypix.c,v 3.8 1998/07/17 03:24:16 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.0
- * Copyright (C) 1995-1998 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 3.8 1998/07/17 03:24:16 brianp
- * added Pixel.ScaleOrBiasRGBA field
- *
- * Revision 3.7 1998/05/31 23:50:36 brianp
- * cleaned up a few Solaris compiler warnings
- *
- * Revision 3.6 1998/04/01 02:58:52 brianp
- * applied Miklos Fazekas's 3-31-98 Macintosh changes
- *
- * Revision 3.5 1998/03/27 03:30:36 brianp
- * fixed G++ warnings
- *
- * Revision 3.4 1998/02/15 01:31:41 brianp
- * removed unused variables
- *
- * Revision 3.3 1998/02/08 20:22:14 brianp
- * LOTS of clean-up and rewriting
- *
- * Revision 3.2 1998/02/04 00:33:45 brianp
- * fixed a few cast problems for Amiga StormC compiler
- *
- * Revision 3.1 1998/02/01 22:16:34 brianp
- * include different headers (zooming)
- *
- * Revision 3.0 1998/01/31 20:49:24 brianp
- * initial rev
- *
- */
-
-
- #ifdef PC_HEADER
- #include "all.h"
- #else
- #include <string.h>
- #include "context.h"
- #include "copypix.h"
- #include "depth.h"
- #include "feedback.h"
- #include "macros.h"
- #include "pixel.h"
- #include "span.h"
- #include "stencil.h"
- #include "types.h"
- #include "zoom.h"
- #endif
-
-
-
- static void copy_rgb_pixels( GLcontext* ctx,
- GLint srcx, GLint srcy, GLint width, GLint height,
- GLint destx, GLint desty )
- {
- GLdepth zspan[MAX_WIDTH];
- GLubyte rgba[MAX_WIDTH][4];
- GLboolean quick_draw;
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean setbuffer;
- const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
-
- /* 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;
- }
-
- 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) {
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
- }
- gl_read_rgba_span( ctx, width, srcx, sy, rgba );
-
- if (ctx->Pixel.ScaleOrBiasRGBA) {
- gl_scale_and_bias_rgba( ctx, width, rgba );
- }
- if (ctx->Pixel.MapColorFlag) {
- gl_map_rgba( ctx, width, rgba );
- }
-
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
- }
- if (quick_draw && dy>=0 && dy<ctx->Buffer->Height) {
- (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy, rgba, NULL );
- }
- else if (zoom) {
- gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, rgba, desty);
- }
- else {
- gl_write_rgba_span( ctx, width, destx, dy, zspan, rgba, GL_BITMAP );
- }
- }
- }
-
-
-
- static void copy_ci_pixels( GLcontext* ctx,
- GLint srcx, GLint srcy, GLint width, GLint height,
- GLint destx, GLint desty )
- {
- GLdepth zspan[MAX_WIDTH];
- GLint sy, dy, stepy;
- GLint i, j;
- GLboolean setbuffer;
- const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
- const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
-
- /* 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) {
- GLuint indexes[MAX_WIDTH];
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.ReadBuffer );
- }
- gl_read_index_span( ctx, width, srcx, sy, indexes );
-
- if (shift_or_offset) {
- gl_shift_and_offset_ci( ctx, width, indexes );
- }
- if (ctx->Pixel.MapColorFlag) {
- gl_map_ci( ctx, width, indexes );
- }
-
- if (setbuffer) {
- (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DrawBuffer );
- }
- if (zoom) {
- gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, indexes, desty );
- }
- else {
- gl_write_index_span( ctx, width, destx, dy, zspan, indexes, 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 indexes[MAX_WIDTH];
- GLubyte rgba[MAX_WIDTH][4];
- GLint sy, dy, stepy;
- GLint i, j;
- const GLboolean zoom = ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F;
-
- if (!ctx->Buffer->Depth) {
- 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;
- }
-
- /* setup colors or indexes */
- if (ctx->Visual->RGBAflag) {
- GLuint *rgba32 = (GLuint *) rgba;
- GLuint color = *((GLuint *) ctx->Current.ByteColor);
- for (i=0; i<width; i++) {
- rgba32[i] = color;
- }
- }
- else {
- for (i=0;i<width;i++) {
- indexes[i] = ctx->Current.Index;
- }
- }
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- (*ctx->Driver.ReadDepthSpanFloat)( ctx, width, srcx, sy, depth );
-
- for (i=0;i<width;i++) {
- GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
- zspan[i] = (GLint) (CLAMP( d, 0.0F, 1.0F ) * DEPTH_SCALE);
- }
-
- if (ctx->Visual->RGBAflag) {
- if (zoom) {
- gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, rgba, desty );
- }
- else {
- gl_write_rgba_span( ctx, width, destx, dy, zspan, rgba, GL_BITMAP);
- }
- }
- else {
- if (zoom) {
- gl_write_zoomed_index_span( ctx, width, destx, dy,
- zspan, indexes, desty );
- }
- else {
- gl_write_index_span( ctx, width, destx, dy,
- zspan, indexes, 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 j;
- const GLboolean zoom = (ctx->Pixel.ZoomX!=1.0F || ctx->Pixel.ZoomY!=1.0F);
- const GLboolean shift_or_offset = ctx->Pixel.IndexShift!=0 || ctx->Pixel.IndexOffset!=0;
-
- if (!ctx->Buffer->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;
- }
-
- for (j=0; j<height; j++, sy+=stepy, dy+=stepy) {
- gl_read_stencil_span( ctx, width, srcx, sy, stencil );
-
- if (shift_or_offset) {
- gl_shift_and_offset_stencil( ctx, width, stencil );
- }
- if (ctx->Pixel.MapStencilFlag) {
- gl_map_stencil( ctx, width, stencil );
- }
-
- 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] = (GLfloat) ctx->Current.ByteColor[0] / 255.0;
- color[1] = (GLfloat) ctx->Current.ByteColor[1] / 255.0;
- color[2] = (GLfloat) ctx->Current.ByteColor[2] / 255.0;
- color[3] = (GLfloat) ctx->Current.ByteColor[3] / 255.0;
- FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) 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] );
- }
-
- }
-
-
-