424 lines
12 KiB
C
424 lines
12 KiB
C
/*
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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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;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 Unpublished -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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** $Revision: 1.7 $
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** $Date: 1993/06/18 00:29:39 $
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*/
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#include "precomp.h"
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#pragma hdrstop
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GLubyte __glMsbToLsbTable[256] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
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};
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static GLubyte LowBitsMask[9] = {
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0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
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};
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static GLubyte HighBitsMask[9] = {
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0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff,
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};
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/************************************************************************/
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void FASTCALL __glConvertStipple(__GLcontext *gc)
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{
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GLubyte b0, b1, b2, b3, *stipple;
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GLuint *dst;
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GLint i;
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stipple = &gc->state.polygonStipple.stipple[0];
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dst = &gc->polygon.stipple[0];
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#ifdef __GL_STIPPLE_MSB
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/*
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** Convert input stipple bytes which are in little endian MSB format
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** into a single long word, whose high bit represents the left most
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** X coordinate of a 32 bit span.
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*/
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for (i = 0; i < 32; i++) {
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b0 = *stipple++;
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b1 = *stipple++;
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b2 = *stipple++;
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b3 = *stipple++;
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*dst++ = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;
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}
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#else
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/*
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** Make 32bit form of the stipple for easier rendering.
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*/
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for (i = 0; i < 32; i++) {
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b0 = __glMsbToLsbTable[*stipple++];
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b1 = __glMsbToLsbTable[*stipple++];
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b2 = __glMsbToLsbTable[*stipple++];
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b3 = __glMsbToLsbTable[*stipple++];
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*dst++ = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24);
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}
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#endif
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}
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/************************************************************************/
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/*
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** Compute memory required for internal packed array of data of given type
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** and format.
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*/
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GLint APIPRIVATE __glImageSize(GLsizei width, GLsizei height, GLenum format, GLenum type)
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{
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GLint bytes_per_row;
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GLint components;
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components = __glElementsPerGroup(format);
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if (type == GL_BITMAP) {
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bytes_per_row = (width + 7) >> 3;
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} else {
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bytes_per_row =(GLint)__glBytesPerElement(type) * width;
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}
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return bytes_per_row * height * components;
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}
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/*
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** Extract array from user's data applying all pixel store modes.
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** The internal packed array format used has LSB_FIRST = FALSE and
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** ALIGNMENT = 1.
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*/
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void APIPRIVATE __glFillImage(__GLcontext *gc, GLsizei width, GLsizei height,
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GLenum format, GLenum type,
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const GLvoid *userdata, GLubyte *newimage)
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{
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GLint components;
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GLint element_size;
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GLint rowsize;
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GLint padding;
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GLint line_length = gc->state.pixel.unpackModes.lineLength;
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GLint alignment = gc->state.pixel.unpackModes.alignment;
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GLint skip_pixels = gc->state.pixel.unpackModes.skipPixels;
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GLint skip_lines = gc->state.pixel.unpackModes.skipLines;
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GLint groups_per_line;
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GLint group_size;
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GLint lsb_first = gc->state.pixel.unpackModes.lsbFirst;
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GLint swap_bytes = gc->state.pixel.unpackModes.swapEndian;
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GLint elements_per_line;
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const GLubyte *start;
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const GLubyte *iter;
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GLubyte *iter2;
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GLint i, j, k;
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components = __glElementsPerGroup(format);
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if (line_length > 0) {
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groups_per_line = line_length;
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} else {
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groups_per_line = width;
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}
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/* All formats except GL_BITMAP fall out trivially */
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if (type == GL_BITMAP) {
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GLint elements_left;
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GLint bit_offset;
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GLint current_byte;
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GLint next_byte;
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GLint high_bit_mask;
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GLint low_bit_mask;
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rowsize = (groups_per_line * components + 7) / 8;
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padding = (rowsize % alignment);
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if (padding) {
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rowsize += alignment - padding;
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}
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start = ((const GLubyte*) userdata) + skip_lines * rowsize +
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(skip_pixels * components / 8);
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bit_offset = (skip_pixels * components) % 8;
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high_bit_mask = LowBitsMask[8-bit_offset];
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low_bit_mask = HighBitsMask[bit_offset];
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elements_per_line = width * components;
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iter2 = newimage;
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for (i = 0; i < height; i++) {
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elements_left = elements_per_line;
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iter = start;
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while (elements_left) {
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/* First retrieve low bits from current byte */
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if (lsb_first) {
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current_byte = __glMsbToLsbTable[iter[0]];
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} else {
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current_byte = iter[0];
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}
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if (bit_offset) {
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/* Need to read next byte to finish current byte */
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if (elements_left > (8 - bit_offset)) {
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if (lsb_first) {
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next_byte = __glMsbToLsbTable[iter[1]];
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} else {
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next_byte = iter[1];
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}
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current_byte =
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((current_byte & high_bit_mask) << bit_offset) |
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((next_byte & low_bit_mask) >> (8 - bit_offset));
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} else {
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current_byte =
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((current_byte & high_bit_mask) << bit_offset);
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}
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}
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if (elements_left >= 8) {
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*iter2 = (GLubyte) current_byte;
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elements_left -= 8;
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} else {
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*iter2 = (GLubyte)
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(current_byte & HighBitsMask[elements_left]);
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elements_left = 0;
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}
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iter2++;
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iter++;
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}
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start += rowsize;
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}
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} else {
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element_size = (GLint)__glBytesPerElement(type);
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group_size = element_size * components;
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if (element_size == 1) swap_bytes = 0;
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rowsize = groups_per_line * group_size;
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padding = (rowsize % alignment);
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if (padding) {
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rowsize += alignment - padding;
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}
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start = ((const GLubyte*) userdata) + skip_lines * rowsize
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+ skip_pixels * group_size;
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iter2 = newimage;
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elements_per_line = width * components;
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if (swap_bytes) {
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for (i = 0; i < height; i++) {
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iter = start;
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for (j = 0; j < elements_per_line; j++) {
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for (k = 1; k <= element_size; k++) {
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iter2[k-1] = iter[element_size - k];
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}
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iter2 += element_size;
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iter += element_size;
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}
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start += rowsize;
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}
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} else {
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if (rowsize == elements_per_line * element_size) {
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/* Ha! This is mondo easy! */
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__GL_MEMCOPY(iter2, start,
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elements_per_line * element_size * height);
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} else {
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iter = start;
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for (i = 0; i < height; i++) {
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__GL_MEMCOPY(iter2, iter, elements_per_line * element_size);
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iter2 += elements_per_line * element_size;
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iter += rowsize;
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}
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}
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}
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}
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}
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/*
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** Insert array into user's data applying all pixel store modes.
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** The internal packed array format used has LSB_FIRST = FALSE and
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** ALIGNMENT = 1. __glEmptyImage() because it is the opposite of
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** __glFillImage().
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*/
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void __glEmptyImage(__GLcontext *gc, GLsizei width, GLsizei height,
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GLenum format, GLenum type,
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const GLubyte *oldimage, GLvoid *userdata)
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{
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GLint components;
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GLint element_size;
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GLint rowsize;
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GLint padding;
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GLint line_length = gc->state.pixel.packModes.lineLength;
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GLint alignment = gc->state.pixel.packModes.alignment;
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GLint skip_pixels = gc->state.pixel.packModes.skipPixels;
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GLint skip_lines = gc->state.pixel.packModes.skipLines;
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GLint groups_per_line;
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GLint group_size;
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GLint lsb_first = gc->state.pixel.packModes.lsbFirst;
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GLint swap_bytes = gc->state.pixel.packModes.swapEndian;
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GLint elements_per_line;
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GLubyte *start;
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GLubyte *iter;
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const GLubyte *iter2;
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GLint i, j, k;
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components = __glElementsPerGroup(format);
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if (line_length > 0) {
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groups_per_line = line_length;
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} else {
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groups_per_line = width;
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}
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/* All formats except GL_BITMAP fall out trivially */
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if (type == GL_BITMAP) {
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GLint elements_left;
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GLint bit_offset;
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GLint current_byte;
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GLint high_bit_mask;
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GLint low_bit_mask;
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GLint write_mask;
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GLubyte write_byte;
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rowsize = (groups_per_line * components + 7) / 8;
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padding = (rowsize % alignment);
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if (padding) {
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rowsize += alignment - padding;
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}
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start = ((GLubyte*) userdata) + skip_lines * rowsize +
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(skip_pixels * components / 8);
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bit_offset = (skip_pixels * components) % 8;
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high_bit_mask = LowBitsMask[8-bit_offset];
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low_bit_mask = HighBitsMask[bit_offset];
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elements_per_line = width * components;
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iter2 = oldimage;
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for (i = 0; i < height; i++) {
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elements_left = elements_per_line;
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iter = start;
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write_mask = high_bit_mask;
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write_byte = 0;
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while (elements_left) {
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/* Set up write_mask (to write to current byte) */
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if (elements_left + bit_offset < 8) {
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/* Need to trim write_mask */
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write_mask &= HighBitsMask[bit_offset+elements_left];
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}
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if (lsb_first) {
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current_byte = __glMsbToLsbTable[iter[0]];
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} else {
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current_byte = iter[0];
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}
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if (bit_offset) {
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write_byte |= (GLubyte) (iter2[0] >> bit_offset);
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current_byte = (current_byte & ~write_mask) |
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(write_byte & write_mask);
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write_byte = (GLubyte) (iter2[0] << (8 - bit_offset));
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} else {
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current_byte = (current_byte & ~write_mask) |
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(iter2[0] & write_mask);
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}
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if (lsb_first) {
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iter[0] = __glMsbToLsbTable[current_byte];
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} else {
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iter[0] = (GLubyte) current_byte;
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}
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if (elements_left >= 8) {
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elements_left -= 8;
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} else {
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elements_left = 0;
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}
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iter2++;
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iter++;
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write_mask = 0xff;
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}
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if (write_byte) {
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/* Some data left over that still needs writing */
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write_mask &= low_bit_mask;
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if (lsb_first) {
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current_byte = __glMsbToLsbTable[iter[0]];
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} else {
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current_byte = iter[0];
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}
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current_byte = (current_byte & ~write_mask) |
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(write_byte & write_mask);
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if (lsb_first) {
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iter[0] = __glMsbToLsbTable[current_byte];
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} else {
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iter[0] = (GLubyte) current_byte;
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}
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}
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start += rowsize;
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}
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} else {
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element_size = (GLint)__glBytesPerElement(type);
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group_size = element_size * components;
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if (element_size == 1) swap_bytes = 0;
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rowsize = groups_per_line * group_size;
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padding = (rowsize % alignment);
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if (padding) {
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rowsize += alignment - padding;
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}
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start = ((GLubyte*) userdata) + skip_lines * rowsize
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+ skip_pixels * group_size;
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iter2 = oldimage;
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elements_per_line = width * components;
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if (swap_bytes) {
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for (i = 0; i < height; i++) {
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iter = start;
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for (j = 0; j < elements_per_line; j++) {
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for (k = 1; k <= element_size; k++) {
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iter[k-1] = iter2[element_size - k];
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}
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iter2 += element_size;
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iter += element_size;
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}
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start += rowsize;
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}
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} else {
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if (rowsize == elements_per_line * element_size) {
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/* Ha! This is mondo easy! */
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__GL_MEMCOPY(start, iter2,
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elements_per_line * element_size * height);
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} else {
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iter = start;
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for (i = 0; i < height; i++) {
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__GL_MEMCOPY(iter, iter2, elements_per_line * element_size);
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iter2 += elements_per_line * element_size;
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iter += rowsize;
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}
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}
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}
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}
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}
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