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/* $Id: feedback.c,v 1.3 1996/09/27 01:28:13 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: feedback.c,v $
* Revision 1.3 1996/09/27 01:28:13 brianp
* added missing error check to gl_RenderMode()
*
* Revision 1.2 1996/09/15 14:17:30 brianp
* now use GLframebuffer and GLvisual
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#include "context.h"
#include "feedback.h"
#include "dlist.h"
#include "macros.h"
#include "types.h"
#define FB_3D 0x01
#define FB_4D 0x02
#define FB_INDEX 0x04
#define FB_COLOR 0x08
#define FB_TEXTURE 0X10
void
gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
{
if (ctx->RenderMode==GL_FEEDBACK || INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
return;
}
if (size<0) {
gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer" );
}
switch (type) {
case GL_2D:
ctx->Feedback.Mask = 0;
ctx->Feedback.Type = type;
break;
case GL_3D:
ctx->Feedback.Mask = FB_3D;
ctx->Feedback.Type = type;
break;
case GL_3D_COLOR:
ctx->Feedback.Mask = FB_3D
| (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
ctx->Feedback.Type = type;
break;
case GL_3D_COLOR_TEXTURE:
ctx->Feedback.Mask = FB_3D
| (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
| FB_TEXTURE;
ctx->Feedback.Type = type;
break;
case GL_4D_COLOR_TEXTURE:
ctx->Feedback.Mask = FB_3D | FB_4D
| (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
| FB_TEXTURE;
ctx->Feedback.Type = type;
break;
default:
ctx->Feedback.Mask = 0;
gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
}
ctx->Feedback.BufferSize = size;
ctx->Feedback.Buffer = buffer;
ctx->Feedback.Count = 0;
}
void gl_PassThrough( GLcontext *ctx, GLfloat token )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPassThrough" );
return;
}
if (ctx->RenderMode==GL_FEEDBACK) {
FEEDBACK_TOKEN( ctx, (GLfloat) GL_PASS_THROUGH_TOKEN );
FEEDBACK_TOKEN( ctx, token );
}
}
/*
* Put a vertex into the feedback buffer.
*/
void gl_feedback_vertex( GLcontext *ctx,
GLfloat x, GLfloat y, GLfloat z, GLfloat w,
const GLfloat color[4], GLfloat index,
const GLfloat texcoord[4] )
{
FEEDBACK_TOKEN( ctx, x );
FEEDBACK_TOKEN( ctx, y );
if (ctx->Feedback.Mask & FB_3D) {
FEEDBACK_TOKEN( ctx, z );
}
if (ctx->Feedback.Mask & FB_4D) {
FEEDBACK_TOKEN( ctx, w );
}
if (ctx->Feedback.Mask & FB_INDEX) {
FEEDBACK_TOKEN( ctx, index );
}
if (ctx->Feedback.Mask & FB_COLOR) {
FEEDBACK_TOKEN( ctx, color[0] );
FEEDBACK_TOKEN( ctx, color[1] );
FEEDBACK_TOKEN( ctx, color[2] );
FEEDBACK_TOKEN( ctx, color[3] );
}
if (ctx->Feedback.Mask & FB_TEXTURE) {
FEEDBACK_TOKEN( ctx, texcoord[0] );
FEEDBACK_TOKEN( ctx, texcoord[1] );
FEEDBACK_TOKEN( ctx, texcoord[2] );
FEEDBACK_TOKEN( ctx, texcoord[3] );
}
}
/**********************************************************************/
/* Selection */
/**********************************************************************/
/*
* NOTE: this function can't be put in a display list.
*/
void gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
}
if (ctx->RenderMode==GL_SELECT) {
gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
}
ctx->Select.Buffer = buffer;
ctx->Select.BufferSize = size;
ctx->Select.BufferCount = 0;
ctx->Select.HitFlag = GL_FALSE;
ctx->Select.HitMinZ = 1.0;
ctx->Select.HitMaxZ = 0.0;
}
void gl_InitNames( GLcontext *ctx )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glInitNames" );
}
ctx->Select.NameStackDepth = 0;
ctx->Select.HitFlag = GL_FALSE;
ctx->Select.HitMinZ = 1.0;
ctx->Select.HitMaxZ = 0.0;
}
#define WRITE_RECORD( CTX, V ) \
if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
CTX->Select.Buffer[CTX->Select.BufferCount] = (V); \
} \
CTX->Select.BufferCount++;
void gl_update_hitflag( GLcontext *ctx, GLfloat z )
{
ctx->Select.HitFlag = GL_TRUE;
if (z < ctx->Select.HitMinZ) {
ctx->Select.HitMinZ = z;
}
if (z < ctx->Select.HitMinZ) {
ctx->Select.HitMaxZ = z;
}
}
static void write_hit_record( GLcontext *ctx )
{
if (ctx->Select.BufferCount < ctx->Select.BufferSize) {
GLuint i;
GLuint zmin, zmax, zscale = (~0u);
/* HitMinZ and HitMaxZ are in [0,1]. Multiply these values by */
/* 2^32-1 and round to nearest unsigned integer. */
zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
WRITE_RECORD( ctx, zmin );
WRITE_RECORD( ctx, zmax );
for (i=0;i<ctx->Select.NameStackDepth;i++) {
WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
}
ctx->Select.Hits++;
}
/* TODO: is this correct??? */
ctx->Select.HitFlag = GL_FALSE;
ctx->Select.HitMinZ = 1.0;
ctx->Select.HitMaxZ = -1.0;
}
void gl_LoadName( GLcontext *ctx, GLuint name )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
return;
}
if (ctx->RenderMode!=GL_SELECT) {
return;
}
if (ctx->Select.NameStackDepth==0) {
gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
return;
}
if (ctx->Select.HitFlag) {
write_hit_record( ctx );
}
if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
}
else {
ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
}
}
void gl_PushName( GLcontext *ctx, GLuint name )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPushName" );
return;
}
if (ctx->RenderMode!=GL_SELECT) {
return;
}
if (ctx->Select.HitFlag) {
write_hit_record( ctx );
}
if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
}
else {
gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
}
}
void gl_PopName( GLcontext *ctx )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPopName" );
return;
}
if (ctx->RenderMode!=GL_SELECT) {
return;
}
if (ctx->Select.HitFlag) {
write_hit_record( ctx );
}
if (ctx->Select.NameStackDepth>0) {
ctx->Select.NameStackDepth--;
}
else {
gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
}
}
/**********************************************************************/
/* Render Mode */
/**********************************************************************/
/*
* NOTE: this function can't be put in a display list.
*/
GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
{
GLint result;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glInitNames" );
}
switch (ctx->RenderMode) {
case GL_RENDER:
result = 0;
break;
case GL_SELECT:
if (ctx->Select.HitFlag) {
write_hit_record( ctx );
}
if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
/* overflow */
result = -1;
}
else {
result = ctx->Select.Hits;
}
ctx->Select.BufferCount = 0;
ctx->Select.Hits = 0;
ctx->Select.NameStackDepth = 0;
break;
case GL_FEEDBACK:
if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
/* overflow */
result = -1;
}
else {
result = ctx->Feedback.Count;
}
ctx->Feedback.Count = 0;
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
return 0;
}
switch (mode) {
case GL_RENDER:
break;
case GL_SELECT:
if (ctx->Select.BufferSize==0) {
/* haven't called glSelectBuffer yet */
gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
}
break;
case GL_FEEDBACK:
if (ctx->Feedback.BufferSize==0) {
/* haven't called glFeedbackBuffer yet */
gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
return 0;
}
ctx->RenderMode = mode;
ctx->NewState |= NEW_ALL;
return result;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.