283 lines
6.8 KiB
C
283 lines
6.8 KiB
C
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/*
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** Copyright 1991,1992, Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
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** the contents of this file may not be disclosed to third parties, copied or
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** duplicated in any form, in whole or in part, without the prior written
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** permission of Silicon Graphics, Inc.
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**
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** RESTRICTED RIGHTS LEGEND:
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** Use, duplication or disclosure by the Government is subject to restrictions
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** as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
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** and Computer Software clause at DFARS 252.227-7013, and/or in similar or
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** successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
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** rights reserved under the Copyright Laws of the United States.
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*/
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#include "precomp.h"
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#pragma hdrstop
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/*
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** This file contains span reading routines. These are routines which
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** read data from the depth buffer, stencil buffer, or frame buffer
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** into internal software spans. The type of internal span that it
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** is read into varies from routine to routine.
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*/
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/*
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** A reader that reads spans into scaled a RGBA, FLOAT span.
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**
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** zoomx is assumed to be less than 1.0 and greater than -1.0.
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*/
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void FASTCALL __glSpanReadRGBA(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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GLshort *pixelArray;
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GLint skipCount;
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width = spanInfo->realWidth;
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spanData = (GLfloat*) span;
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pixelArray = spanInfo->pixelArray;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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for (i=0; i<width; i++) {
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#ifdef NT
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(*gc->readBuffer->readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#else
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(*gc->frontBuffer.readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#endif
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spanData += 4;
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skipCount = *pixelArray++;
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readX += skipCount;
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}
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}
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/*
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** A reader that reads spans into a scaled RGBA, FLOAT span.
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**
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** zoomx is assumed to be less than or equal to -1.0 or greater than or
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** equal to 1.0.
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*/
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void FASTCALL __glSpanReadRGBA2(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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width = spanInfo->width;
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spanData = (GLfloat*) span;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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#ifdef NT
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(*gc->readBuffer->readSpan)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData, width);
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#else
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(*gc->frontBuffer.readSpan)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData, width);
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#endif
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}
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/*
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** A reader that reads spans into a COLOR_INDEX, FLOAT span.
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**
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** zoomx is assumed to be less than 1.0 and greater than -1.0.
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*/
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void FASTCALL __glSpanReadCI(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLenum format;
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GLint readY, readX;
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GLshort *pixelArray;
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GLint skipCount;
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width = spanInfo->realWidth;
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spanData = (GLfloat*) span;
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pixelArray = spanInfo->pixelArray;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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for (i=0; i<width; i++) {
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#ifdef NT
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(*gc->readBuffer->readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#else
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(*gc->frontBuffer.readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#endif
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spanData++;
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skipCount = *pixelArray++;
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readX += skipCount;
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}
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}
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/*
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** A reader that reads spans into a COLOR_INDEX, FLOAT span.
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**
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** zoomx is assumed to be less than or equal to -1.0 or greater than or
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** equal to 1.0.
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*/
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void FASTCALL __glSpanReadCI2(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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width = spanInfo->width;
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spanData = (GLfloat*) span;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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for (i=0; i<width; i++) {
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#ifdef NT
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(*gc->readBuffer->readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#else
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(*gc->frontBuffer.readColor)(gc->readBuffer, readX, readY,
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(__GLcolor *) spanData);
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#endif
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spanData++;
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readX++;
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}
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}
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/*
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** A reader that reads spans into a DEPTH_COMPONENT, FLOAT span.
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**
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** zoomx is assumed to be less than 1.0 and greater than -1.0.
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*/
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void FASTCALL __glSpanReadDepth(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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GLshort *pixelArray;
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GLint skipCount;
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__GLfloat oneOverScale;
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width = spanInfo->realWidth;
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spanData = (GLfloat*) span;
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pixelArray = spanInfo->pixelArray;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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oneOverScale = __glOne / gc->depthBuffer.scale;
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for (i=0; i<width; i++) {
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*spanData++ =
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(*gc->depthBuffer.fetch)(&(gc->depthBuffer), readX, readY) *
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oneOverScale;
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skipCount = *pixelArray++;
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readX += skipCount;
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}
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}
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/*
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** A reader that reads spans into a DEPTH_COMPONENT, FLOAT span.
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**
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** zoomx is assumed to be less than or equal to -1.0 or greater than or
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** equal to 1.0.
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*/
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void FASTCALL __glSpanReadDepth2(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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__GLfloat oneOverScale;
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width = spanInfo->width;
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spanData = (GLfloat*) span;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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oneOverScale = __glOne / gc->depthBuffer.scale;
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for (i=0; i<width; i++) {
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*spanData++ =
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(*gc->depthBuffer.fetch)(&(gc->depthBuffer), readX, readY) *
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oneOverScale;
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readX++;
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}
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}
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/*
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** A reader that reads spans into a STENCIL_INDEX, FLOAT span.
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**
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** zoomx is assumed to be less than 1.0 and greater than -1.0.
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*/
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void FASTCALL __glSpanReadStencil(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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GLshort *pixelArray;
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GLint skipCount;
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width = spanInfo->realWidth;
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spanData = (GLfloat*) span;
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pixelArray = spanInfo->pixelArray;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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for (i=0; i<width; i++) {
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*spanData++ =
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(*gc->stencilBuffer.fetch)(&(gc->stencilBuffer), readX, readY);
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skipCount = *pixelArray++;
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readX += skipCount;
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}
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}
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/*
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** A reader that reads spans into a STENCIL_INDEX, FLOAT span.
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**
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** zoomx is assumed to be less than or equal to -1.0 or greater than or
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** equal to 1.0.
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*/
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void FASTCALL __glSpanReadStencil2(__GLcontext *gc, __GLpixelSpanInfo *spanInfo,
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GLvoid *span)
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{
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GLint i;
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GLint width;
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GLfloat *spanData;
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GLint readY, readX;
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width = spanInfo->width;
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spanData = (GLfloat*) span;
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readY = spanInfo->readY;
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readX = spanInfo->readX;
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for (i=0; i<width; i++) {
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*spanData++ =
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(*gc->stencilBuffer.fetch)(&(gc->stencilBuffer), readX, readY);
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readX++;
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}
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}
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