/* $Id: feedback.c,v 1.6 1999/11/11 01:22:26 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
*
* Copyright (C) 1999 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "context.h"
#include "enums.h"
#include "feedback.h"
#include "macros.h"
#include "mmath.h"
#include "types.h"
#include "triangle.h"
#endif
#define FB_3D 0x01
#define FB_4D 0x02
#define FB_INDEX 0x04
#define FB_COLOR 0x08
#define FB_TEXTURE 0X10
void
_mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
if (ctx->RenderMode==GL_FEEDBACK) {
gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
return;
}
if (size<0) {
gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
return;
}
if (!buffer) {
gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
ctx->Feedback.BufferSize = 0;
return;
}
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
_mesa_PassThrough( GLfloat token )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
if (ctx->RenderMode==GL_FEEDBACK) {
FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
FEEDBACK_TOKEN( ctx, token );
}
}
/*
* Put a vertex into the feedback buffer.
*/
void gl_feedback_vertex( GLcontext *ctx,
const GLfloat win[4],
const GLfloat color[4],
GLuint index,
const GLfloat texcoord[4] )
{
FEEDBACK_TOKEN( ctx, win[0] );
FEEDBACK_TOKEN( ctx, win[1] );
if (ctx->Feedback.Mask & FB_3D) {
FEEDBACK_TOKEN( ctx, win[2] );
}
if (ctx->Feedback.Mask & FB_4D) {
FEEDBACK_TOKEN( ctx, win[3] );
}
if (ctx->Feedback.Mask & FB_INDEX) {
FEEDBACK_TOKEN( ctx, (GLfloat) 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] );
}
}
static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
{
GLfloat win[4];
GLfloat color[4];
GLfloat tc[4];
GLuint texUnit = ctx->Texture.CurrentTransformUnit;
struct vertex_buffer *VB = ctx->VB;
win[0] = VB->Win.data[v][0];
win[1] = VB->Win.data[v][1];
win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
win[3] = 1.0 / VB->Win.data[v][3];
if (ctx->Light.ShadeModel==GL_SMOOTH) pv = v;
UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
if (VB->TexCoordPtr[texUnit]->size == 4 &&
VB->TexCoordPtr[texUnit]->data[v][3]!=0.0)
{
GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
} else {
ASSIGN_4V(tc, 0,0,0,1);
COPY_SZ_4V(tc,
VB->TexCoordPtr[texUnit]->size,
VB->TexCoordPtr[texUnit]->data[v]);
}
gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], tc );
}
/*
* Put triangle in feedback buffer.
*/
void gl_feedback_triangle( GLcontext *ctx,
GLuint v0, GLuint v1, GLuint v2, GLuint pv )
{
if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
FEEDBACK_TOKEN( ctx, (GLfloat) 3 ); /* three vertices */
gl_do_feedback_vertex( ctx, v0, pv );
gl_do_feedback_vertex( ctx, v1, pv );
gl_do_feedback_vertex( ctx, v2, pv );
}
}
void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
{
GLenum token = GL_LINE_TOKEN;
if (ctx->StippleCounter==0)
token = GL_LINE_RESET_TOKEN;
FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
gl_do_feedback_vertex( ctx, v1, pv );
gl_do_feedback_vertex( ctx, v2, pv );
ctx->StippleCounter++;
}
void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
{
struct vertex_buffer *VB = ctx->VB;
GLuint i;
for (i=first;i<=last;i++)
if (VB->ClipMask[i]==0) {
FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
gl_do_feedback_vertex( ctx, i, i );
}
}
/**********************************************************************/
/* Selection */
/**********************************************************************/
/*
* NOTE: this function can't be put in a display list.
*/
void
_mesa_SelectBuffer( GLsizei size, GLuint *buffer )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "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;
}
#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.HitMaxZ) {
ctx->Select.HitMaxZ = z;
}
}
void gl_select_triangle( GLcontext *ctx,
GLuint v0, GLuint v1, GLuint v2, GLuint pv )
{
struct vertex_buffer *VB = ctx->VB;
if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
}
}
void gl_select_line( GLcontext *ctx,
GLuint v0, GLuint v1, GLuint pv )
{
struct vertex_buffer *VB = ctx->VB;
gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
}
void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
{
struct vertex_buffer *VB = ctx->VB;
GLuint i;
for (i=first;i<=last;i++)
if (VB->ClipMask[i]==0)
gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
}
static void write_hit_record( GLcontext *ctx )
{
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. */
assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
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++;
ctx->Select.HitFlag = GL_FALSE;
ctx->Select.HitMinZ = 1.0;
ctx->Select.HitMaxZ = -1.0;
}
void
_mesa_InitNames( void )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
/* Record the hit before the HitFlag is wiped out again. */
if (ctx->RenderMode==GL_SELECT) {
if (ctx->Select.HitFlag) {
write_hit_record( ctx );
}
}
ctx->Select.NameStackDepth = 0;
ctx->Select.HitFlag = GL_FALSE;
ctx->Select.HitMinZ = 1.0;
ctx->Select.HitMaxZ = 0.0;
}
void
_mesa_LoadName( GLuint name )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
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
_mesa_PushName( GLuint name )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
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
_mesa_PopName( void )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
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
_mesa_RenderMode( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
GLint result;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
if (MESA_VERBOSE & VERBOSE_API)
fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
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 */
#ifdef DEBUG
gl_warning(ctx, "Feedback buffer overflow");
#endif
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:
ctx->TriangleCaps |= DD_SELECT;
if (ctx->Select.BufferSize==0) {
/* haven't called glSelectBuffer yet */
gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
}
break;
case GL_FEEDBACK:
ctx->TriangleCaps |= DD_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;
}