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/* $Id: context.c,v 1.8 1996/10/01 01:42:31 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: context.c,v $
* Revision 1.8 1996/10/01 01:42:31 brianp
* moved device driver initialization into gl_update_state()
*
* Revision 1.7 1996/09/27 01:24:33 brianp
* removed unneeded set_thread_context(), added call to gl_init_vb()
*
* Revision 1.6 1996/09/25 03:22:53 brianp
* added NO_DRAW_BIT for glDrawBuffer(GL_NONE)
*
* Revision 1.5 1996/09/20 02:55:52 brianp
* fixed profiling bug
*
* Revision 1.4 1996/09/19 03:14:49 brianp
* now just one parameter for gl_create_framebuffer()
*
* Revision 1.3 1996/09/15 14:20:22 brianp
* added new functions for GLframebuffer and GLvisual support
*
* Revision 1.2 1996/09/14 20:12:05 brianp
* wasn't initializing a few pieces of context state
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
/*
* If multi-threading is enabled (-DTHREADS) then each thread has it's
* own rendering context. A thread obtains the pointer to its GLcontext
* with the gl_get_thread_context() function. Otherwise, the global
* pointer, CC, points to the current context used by all threads in
* the address space.
*/
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "context.h"
#include "depth.h"
#include "draw.h"
#include "eval.h"
#include "light.h"
#include "lines.h"
#include "dlist.h"
#include "macros.h"
#include "pb.h"
#include "points.h"
#include "pointers.h"
#include "triangle.h"
#include "teximage.h"
#include "texobj.h"
#include "texture.h"
#include "types.h"
#include "vb.h"
#include "vertex.h"
/**********************************************************************/
/***** Context and Thread management *****/
/**********************************************************************/
#ifdef THREADS
/* A different context may be bound to each thread */
#include <sys/types.h>
#include <unistd.h>
#define MAX_THREADS 20
static pid_t ThreadID[MAX_THREADS];
static GLcontext *ThreadContext[MAX_THREADS];
static int NumThreads = 0;
GLcontext *gl_get_thread_context( void )
{
pid_t id;
int i;
id = getpid();
for (i=0;i<MAX_THREADS;i++) {
if (ThreadID[i]==id) {
return ThreadContext[i];
}
}
/* No context for this thread */
return NULL;
}
static void set_thread_context( GLcontext *ctx )
{
pid_t id = getpid();
int i;
for (i=0;i<NumThreads;i++) {
if (ThreadID[i]==id) {
ThreadContext[i] = c;
return;
}
}
if (i<MAX_THREADS) {
ThreadID[i] = getpid();
ThreadContext[i] = c;
NumThreads++;
}
}
#else
/* One Current Context pointer for all threads in the address space */
GLcontext *CC = NULL;
#endif /*THREADS*/
/**********************************************************************/
/***** Profiling functions *****/
/**********************************************************************/
#ifdef PROFILE
#include <sys/times.h>
#include <sys/param.h>
/*
* Return system time in seconds.
* NOTE: this implementation may not be very portable!
*/
GLdouble gl_time( void )
{
static GLdouble prev_time = 0.0;
static GLdouble time;
struct tms tm;
clock_t clk;
clk = times(&tm);
#ifdef CLK_TCK
time = (double)clk / (double)CLK_TCK;
#else
time = (double)clk / (double)HZ;
#endif
if (time>prev_time) {
prev_time = time;
return time;
}
else {
return prev_time;
}
}
/*
* Reset the timing/profiling counters
*/
static void init_timings( GLcontext *ctx )
{
ctx->BeginEndCount = 0;
ctx->BeginEndTime = 0.0;
ctx->VertexCount = 0;
ctx->VertexTime = 0.0;
ctx->PointCount = 0;
ctx->PointTime = 0.0;
ctx->LineCount = 0;
ctx->LineTime = 0.0;
ctx->PolygonCount = 0;
ctx->PolygonTime = 0.0;
ctx->ClearCount = 0;
ctx->ClearTime = 0.0;
ctx->SwapCount = 0;
ctx->SwapTime = 0.0;
}
/*
* Print the accumulated timing/profiling data.
*/
static void print_timings( GLcontext *ctx )
{
GLdouble beginendrate;
GLdouble vertexrate;
GLdouble pointrate;
GLdouble linerate;
GLdouble polygonrate;
GLdouble overhead;
GLdouble clearrate;
GLdouble swaprate;
GLdouble avgvertices;
if (ctx->BeginEndTime>0.0) {
beginendrate = ctx->BeginEndCount / ctx->BeginEndTime;
}
else {
beginendrate = 0.0;
}
if (ctx->VertexTime>0.0) {
vertexrate = ctx->VertexCount / ctx->VertexTime;
}
else {
vertexrate = 0.0;
}
if (ctx->PointTime>0.0) {
pointrate = ctx->PointCount / ctx->PointTime;
}
else {
pointrate = 0.0;
}
if (ctx->LineTime>0.0) {
linerate = ctx->LineCount / ctx->LineTime;
}
else {
linerate = 0.0;
}
if (ctx->PolygonTime>0.0) {
polygonrate = ctx->PolygonCount / ctx->PolygonTime;
}
else {
polygonrate = 0.0;
}
if (ctx->ClearTime>0.0) {
clearrate = ctx->ClearCount / ctx->ClearTime;
}
else {
clearrate = 0.0;
}
if (ctx->SwapTime>0.0) {
swaprate = ctx->SwapCount / ctx->SwapTime;
}
else {
swaprate = 0.0;
}
if (ctx->BeginEndCount>0) {
avgvertices = (GLdouble) ctx->VertexCount / (GLdouble) ctx->BeginEndCount;
}
else {
avgvertices = 0.0;
}
overhead = ctx->BeginEndTime - ctx->VertexTime - ctx->PointTime
- ctx->LineTime - ctx->PolygonTime;
printf(" Count Time (s) Rate (/s) \n");
printf("--------------------------------------------------------\n");
printf("glBegin/glEnd %7d %8.3f %10.3f\n",
ctx->BeginEndCount, ctx->BeginEndTime, beginendrate);
printf(" vertexes transformed %7d %8.3f %10.3f\n",
ctx->VertexCount, ctx->VertexTime, vertexrate );
printf(" points rasterized %7d %8.3f %10.3f\n",
ctx->PointCount, ctx->PointTime, pointrate );
printf(" lines rasterized %7d %8.3f %10.3f\n",
ctx->LineCount, ctx->LineTime, linerate );
printf(" polygons rasterized %7d %8.3f %10.3f\n",
ctx->PolygonCount, ctx->PolygonTime, polygonrate );
printf(" overhead %8.3f\n", overhead );
printf("glClear %7d %8.3f %10.3f\n",
ctx->ClearCount, ctx->ClearTime, clearrate );
printf("SwapBuffers %7d %8.3f %10.3f\n",
ctx->SwapCount, ctx->SwapTime, swaprate );
printf("\n");
printf("Average number of vertices per begin/end: %8.3f\n", avgvertices );
}
#endif
/**********************************************************************/
/***** Context allocation, initialization, destroying *****/
/**********************************************************************/
/*
* Allocate and initialize a shared context state structure.
*/
static struct gl_shared_state *alloc_shared_state( void )
{
struct gl_shared_state *ss;
struct gl_texture_object *t1, *t2;
GLuint i;
ss = (struct gl_shared_state*) malloc( sizeof(struct gl_shared_state) );
ss->RefCount = 0;
/* Display lists */
for (i=0;i<MAX_DISPLAYLISTS;i++) {
ss->List[i] = NULL;
}
/* Texture objects
* There are two default textures, one for the GL_TEXTURE_1D target and
* one for the GL_TEXTURE_2D target. Both are named zero!
*/
t1 = gl_alloc_texture_object();
t1->Dimensions = 1;
t2 = gl_alloc_texture_object();
t2->Dimensions = 2;
ss->TexObjectList = t1;
ss->TexObjectList->Next = t2;
return ss;
}
/*
* Deallocate a shared state context and all children structures.
*/
static void free_shared_state( struct gl_shared_state *ss )
{
struct gl_texture_object *t, *tnext;
/* Free the linked list of texture objects */
t = ss->TexObjectList;
while (t) {
tnext = t->Next;
gl_free_texture_object(t);
t = tnext;
}
free(ss);
}
/*
* Initialize the nth light. Note that the defaults for light 0 are
* different than the other lights.
*/
static void init_light( struct gl_light *l, GLuint n )
{
ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
if (n==0) {
ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
}
else {
ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
}
ASSIGN_4V( l->Position, 0.0, 0.0, 1.0, 0.0 );
ASSIGN_3V( l->Direction, 0.0, 0.0, -1.0 );
l->SpotExponent = 0.0;
gl_compute_spot_exp_table( l );
l->SpotCutoff = 180.0;
l->CosCutoff = -1.0;
l->ConstantAttenuation = 1.0;
l->LinearAttenuation = 0.0;
l->QuadraticAttenuation = 0.0;
l->Enabled = GL_FALSE;
}
static void init_lightmodel( struct gl_lightmodel *lm )
{
ASSIGN_4V( lm->Ambient, 0.2, 0.2, 0.2, 1.0 );
lm->LocalViewer = GL_FALSE;
lm->TwoSide = GL_FALSE;
}
static void init_material( struct gl_material *m )
{
ASSIGN_4V( m->Ambient, 0.2, 0.2, 0.2, 1.0 );
ASSIGN_4V( m->Diffuse, 0.8, 0.8, 0.8, 1.0 );
ASSIGN_4V( m->Specular, 0.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( m->Emission, 0.0, 0.0, 0.0, 1.0 );
m->Shininess = 0.0;
m->AmbientIndex = 0;
m->DiffuseIndex = 1;
m->SpecularIndex = 1;
gl_compute_material_shine_table( m );
}
/*
* Initialize a gl_context structure to default values.
*/
static void initialize_context( GLcontext *ctx )
{
static GLfloat identity[16] = {
1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0
};
GLuint i;
if (ctx) {
/* Transformation matrices and stacks */
ctx->ModelViewStackDepth = 0;
MEMCPY( ctx->ModelViewMatrix, identity, 16*sizeof(GLfloat) );
MEMCPY( ctx->ModelViewInv, identity, 16*sizeof(GLfloat) );
ctx->ModelViewInvValid = GL_TRUE;
ctx->ProjectionStackDepth = 0;
MEMCPY( ctx->ProjectionMatrix, identity, 16*sizeof(GLfloat) );
ctx->TextureStackDepth = 0;
MEMCPY( ctx->TextureMatrix, identity, 16*sizeof(GLfloat) );
ctx->IdentityTexMat = GL_TRUE;
/* Accumulate buffer group */
ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
/* Color buffer group */
ctx->Color.IndexMask = 0xffffffff;
ctx->Color.ColorMask = 0xf;
ctx->Color.SWmasking = GL_FALSE;
ctx->Color.ClearIndex = 0;
ASSIGN_4V( ctx->Color.ClearColor, 0.0, 0.0, 0.0, 0.0 );
ctx->Color.DrawBuffer = GL_FRONT;
ctx->Color.AlphaEnabled = GL_FALSE;
ctx->Color.AlphaFunc = GL_ALWAYS;
ctx->Color.AlphaRef = 0.0;
ctx->Color.BlendEnabled = GL_FALSE;
ctx->Color.BlendSrc = GL_ONE;
ctx->Color.BlendDst = GL_ZERO;
ctx->Color.BlendEquation = GL_FUNC_ADD_EXT;
ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
ctx->Color.LogicOpEnabled = GL_FALSE;
ctx->Color.SWLogicOpEnabled = GL_FALSE;
ctx->Color.LogicOp = GL_COPY;
ctx->Color.DitherFlag = GL_TRUE;
/* Current group */
ctx->Current.Index = 1;
ASSIGN_3V( ctx->Current.Normal, 0.0, 0.0, 1.0 );
ctx->Current.IntColor[0] = (GLint) ctx->Visual->RedScale;
ctx->Current.IntColor[1] = (GLint) ctx->Visual->GreenScale;
ctx->Current.IntColor[2] = (GLint) ctx->Visual->BlueScale;
ctx->Current.IntColor[3] = (GLint) ctx->Visual->AlphaScale;
ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
ctx->Current.RasterPosValid = GL_TRUE;
ctx->Current.RasterIndex = 1;
ASSIGN_4V( ctx->Current.TexCoord, 0.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
ctx->Current.EdgeFlag = GL_TRUE;
/* Depth buffer group */
ctx->Depth.Test = GL_FALSE;
ctx->Depth.Clear = 1.0;
ctx->Depth.Func = GL_LESS;
ctx->Depth.Mask = GL_TRUE;
/* Evaluators group */
ctx->Eval.Map1Color4 = GL_FALSE;
ctx->Eval.Map1Index = GL_FALSE;
ctx->Eval.Map1Normal = GL_FALSE;
ctx->Eval.Map1TextureCoord1 = GL_FALSE;
ctx->Eval.Map1TextureCoord2 = GL_FALSE;
ctx->Eval.Map1TextureCoord3 = GL_FALSE;
ctx->Eval.Map1TextureCoord4 = GL_FALSE;
ctx->Eval.Map1Vertex3 = GL_FALSE;
ctx->Eval.Map1Vertex4 = GL_FALSE;
ctx->Eval.Map2Color4 = GL_FALSE;
ctx->Eval.Map2Index = GL_FALSE;
ctx->Eval.Map2Normal = GL_FALSE;
ctx->Eval.Map2TextureCoord1 = GL_FALSE;
ctx->Eval.Map2TextureCoord2 = GL_FALSE;
ctx->Eval.Map2TextureCoord3 = GL_FALSE;
ctx->Eval.Map2TextureCoord4 = GL_FALSE;
ctx->Eval.Map2Vertex3 = GL_FALSE;
ctx->Eval.Map2Vertex4 = GL_FALSE;
ctx->Eval.AutoNormal = GL_FALSE;
ctx->Eval.MapGrid1un = 1;
ctx->Eval.MapGrid1u1 = 0.0;
ctx->Eval.MapGrid1u2 = 1.0;
ctx->Eval.MapGrid2un = 1;
ctx->Eval.MapGrid2vn = 1;
ctx->Eval.MapGrid2u1 = 0.0;
ctx->Eval.MapGrid2u2 = 1.0;
ctx->Eval.MapGrid2v1 = 0.0;
ctx->Eval.MapGrid2v2 = 1.0;
/* Fog group */
ctx->Fog.Enabled = GL_FALSE;
ctx->Fog.Mode = GL_EXP;
ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
ctx->Fog.Index = 0.0;
ctx->Fog.Density = 1.0;
ctx->Fog.Start = 0.0;
ctx->Fog.End = 1.0;
/* Hint group */
ctx->Hint.PerspectiveCorrection = GL_DONT_CARE;
ctx->Hint.PointSmooth = GL_DONT_CARE;
ctx->Hint.LineSmooth = GL_DONT_CARE;
ctx->Hint.PolygonSmooth = GL_DONT_CARE;
ctx->Hint.Fog = GL_DONT_CARE;
/* Lighting group */
for (i=0;i<MAX_LIGHTS;i++) {
init_light( &ctx->Light.Light[i], i );
}
init_lightmodel( &ctx->Light.Model );
init_material( &ctx->Light.Material[0] );
init_material( &ctx->Light.Material[1] );
ctx->Light.ShadeModel = GL_SMOOTH;
ctx->Light.Enabled = GL_FALSE;
ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
ctx->Light.ColorMaterialEnabled = GL_FALSE;
/* Line group */
ctx->Line.SmoothFlag = GL_FALSE;
ctx->Line.StippleFlag = GL_FALSE;
ctx->Line.Width = 1.0;
ctx->Line.StipplePattern = 0xffff;
ctx->Line.StippleFactor = 1;
/* Display List group */
ctx->List.ListBase = 0;
/* Pixel group */
ctx->Pixel.RedBias = 0.0;
ctx->Pixel.RedScale = 1.0;
ctx->Pixel.GreenBias = 0.0;
ctx->Pixel.GreenScale = 1.0;
ctx->Pixel.BlueBias = 0.0;
ctx->Pixel.BlueScale = 1.0;
ctx->Pixel.AlphaBias = 0.0;
ctx->Pixel.AlphaScale = 1.0;
ctx->Pixel.DepthBias = 0.0;
ctx->Pixel.DepthScale = 1.0;
ctx->Pixel.IndexOffset = 0;
ctx->Pixel.IndexShift = 0;
ctx->Pixel.ZoomX = 1.0;
ctx->Pixel.ZoomY = 1.0;
ctx->Pixel.MapColorFlag = GL_FALSE;
ctx->Pixel.MapStencilFlag = GL_FALSE;
ctx->Pixel.MapStoSsize = 1;
ctx->Pixel.MapItoIsize = 1;
ctx->Pixel.MapItoRsize = 1;
ctx->Pixel.MapItoGsize = 1;
ctx->Pixel.MapItoBsize = 1;
ctx->Pixel.MapItoAsize = 1;
ctx->Pixel.MapRtoRsize = 1;
ctx->Pixel.MapGtoGsize = 1;
ctx->Pixel.MapBtoBsize = 1;
ctx->Pixel.MapAtoAsize = 1;
ctx->Pixel.MapStoS[0] = 0;
ctx->Pixel.MapItoI[0] = 0;
ctx->Pixel.MapItoR[0] = 0.0;
ctx->Pixel.MapItoG[0] = 0.0;
ctx->Pixel.MapItoB[0] = 0.0;
ctx->Pixel.MapItoA[0] = 0.0;
ctx->Pixel.MapRtoR[0] = 0.0;
ctx->Pixel.MapGtoG[0] = 0.0;
ctx->Pixel.MapBtoB[0] = 0.0;
ctx->Pixel.MapAtoA[0] = 0.0;
/* Point group */
ctx->Point.SmoothFlag = GL_FALSE;
ctx->Point.Size = 1.0;
/* Polygon group */
ctx->Polygon.CullFlag = GL_FALSE;
ctx->Polygon.CullFaceMode = GL_BACK;
ctx->Polygon.FrontFace = GL_CCW;
ctx->Polygon.FrontMode = GL_FILL;
ctx->Polygon.BackMode = GL_FILL;
ctx->Polygon.Unfilled = GL_FALSE;
ctx->Polygon.SmoothFlag = GL_FALSE;
ctx->Polygon.StippleFlag = GL_FALSE;
ctx->Polygon.OffsetFactor = 0.0F;
ctx->Polygon.OffsetUnits = 0.0F;
ctx->Polygon.OffsetBias = 0.0F;
ctx->Polygon.OffsetPoint = GL_FALSE;
ctx->Polygon.OffsetLine = GL_FALSE;
ctx->Polygon.OffsetFill = GL_FALSE;
ctx->Polygon.OffsetAny = GL_FALSE;
/* Polygon Stipple group */
MEMSET( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
/* Scissor group */
ctx->Scissor.Enabled = GL_FALSE;
ctx->Scissor.X = 0;
ctx->Scissor.Y = 0;
ctx->Scissor.Width = 0;
ctx->Scissor.Height = 0;
/* Stencil group */
ctx->Stencil.Enabled = GL_FALSE;
ctx->Stencil.Function = GL_ALWAYS;
ctx->Stencil.FailFunc = GL_KEEP;
ctx->Stencil.ZPassFunc = GL_KEEP;
ctx->Stencil.ZFailFunc = GL_KEEP;
ctx->Stencil.Ref = 0;
ctx->Stencil.ValueMask = 0xff;
ctx->Stencil.Clear = 0;
ctx->Stencil.WriteMask = 0xff;
/* Texture group */
ctx->Texture.Enabled = 0;
ctx->Texture.EnvMode = GL_MODULATE;
ASSIGN_4V( ctx->Texture.EnvColor, 0.0, 0.0, 0.0, 0.0 );
ctx->Texture.TexGenEnabled = 0;
ctx->Texture.GenModeS = GL_EYE_LINEAR;
ctx->Texture.GenModeT = GL_EYE_LINEAR;
ctx->Texture.GenModeR = GL_EYE_LINEAR;
ctx->Texture.GenModeQ = GL_EYE_LINEAR;
ASSIGN_4V( ctx->Texture.ObjectPlaneS, 1.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.ObjectPlaneT, 0.0, 1.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.ObjectPlaneR, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.ObjectPlaneQ, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.EyePlaneS, 1.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.EyePlaneT, 0.0, 1.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.EyePlaneR, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( ctx->Texture.EyePlaneQ, 0.0, 0.0, 0.0, 0.0 );
assert( ctx->Shared->TexObjectList );
assert( ctx->Shared->TexObjectList->Next );
ctx->Texture.Current1D = ctx->Shared->TexObjectList;
ctx->Texture.Current2D = ctx->Shared->TexObjectList->Next;
/* Transformation group */
ctx->Transform.MatrixMode = GL_MODELVIEW;
ctx->Transform.Normalize = GL_FALSE;
for (i=0;i<MAX_CLIP_PLANES;i++) {
ctx->Transform.ClipEnabled[i] = GL_FALSE;
ASSIGN_4V( ctx->Transform.ClipEquation[i], 0.0, 0.0, 0.0, 0.0 );
}
ctx->Transform.AnyClip = GL_FALSE;
/* Viewport group */
ctx->Viewport.X = 0;
ctx->Viewport.Y = 0;
ctx->Viewport.Width = 0;
ctx->Viewport.Height = 0;
ctx->Viewport.Near = 0.0;
ctx->Viewport.Far = 1.0;
ctx->Viewport.Sx = 0.0; /* Sx, Tx, Sy, Ty are computed later */
ctx->Viewport.Tx = 0.0;
ctx->Viewport.Sy = 0.0;
ctx->Viewport.Ty = 0.0;
ctx->Viewport.Sz = 0.5;
ctx->Viewport.Tz = 0.5;
/* Pixel transfer */
ctx->Pack.Alignment = 4;
ctx->Pack.RowLength = 0;
ctx->Pack.SkipPixels = 0;
ctx->Pack.SkipRows = 0;
ctx->Pack.SwapBytes = GL_FALSE;
ctx->Pack.LsbFirst = GL_FALSE;
ctx->Unpack.Alignment = 4;
ctx->Unpack.RowLength = 0;
ctx->Unpack.SkipPixels = 0;
ctx->Unpack.SkipRows = 0;
ctx->Unpack.SwapBytes = GL_FALSE;
ctx->Unpack.LsbFirst = GL_FALSE;
/* Feedback */
ctx->Feedback.Type = GL_2D; /* TODO: verify */
ctx->Feedback.Buffer = NULL;
ctx->Feedback.BufferSize = 0;
ctx->Feedback.Count = 0;
/* Selection/picking */
ctx->Select.Buffer = NULL;
ctx->Select.BufferSize = 0;
ctx->Select.BufferCount = 0;
ctx->Select.Hits = 0;
ctx->Select.NameStackDepth = 0;
/* Renderer and client attribute stacks */
ctx->AttribStackDepth = 0;
ctx->ClientAttribStackDepth = 0;
/*** Miscellaneous ***/
ctx->NewState = NEW_ALL;
ctx->RenderMode = GL_RENDER;
ctx->Primitive = GL_BITMAP;
ctx->StippleCounter = 0;
ctx->NeedNormals = GL_FALSE;
if ( ctx->Visual->RedScale==255.0F
&& ctx->Visual->GreenScale==255.0F
&& ctx->Visual->BlueScale==255.0F
&& ctx->Visual->AlphaScale==255.0F) {
ctx->Visual->EightBitColor = GL_TRUE;
}
else {
ctx->Visual->EightBitColor = GL_FALSE;
}
ctx->FastDrawPixels = ctx->Visual->RGBAflag && ctx->Visual->EightBitColor;
ctx->PointsFunc = NULL;
ctx->LineFunc = NULL;
ctx->TriangleFunc = NULL;
ctx->CallDepth = 0;
ctx->ExecuteFlag = GL_TRUE;
ctx->CompileFlag = GL_FALSE;
ctx->ErrorValue = GL_NO_ERROR;
}
}
/*
* Allocate a new GLvisual object.
* Input: rgb_flag - GL_TRUE=RGB(A) mode, GL_FALSE=Color Index mode
* alpha_flag - alloc software alpha buffers?
* db_flag - double buffering?
* depth_bits - requested minimum bits per depth buffer value
* stencil_bits - requested minimum bits per stencil buffer value
* accum_bits - requested minimum bits per accum buffer component
* index_bits - number of bits per pixel if rgb_flag==GL_FALSE
* red, green, blue_scale - float-to-int color scaling
* alpha_scale - ignored if alpha_flag is true
*/
GLvisual *gl_create_visual( GLboolean rgb_flag,
GLboolean alpha_flag,
GLboolean db_flag,
GLint depth_bits,
GLint stencil_bits,
GLint accum_bits,
GLint index_bits,
GLfloat red_scale,
GLfloat green_scale,
GLfloat blue_scale,
GLfloat alpha_scale )
{
GLvisual *vis;
/* Can't do better than 8-bit/channel color at this time */
assert( red_scale<=255.0 );
assert( green_scale<=255.0 );
assert( blue_scale<=255.0 );
assert( alpha_scale<=255.0 );
if (depth_bits > 8*sizeof(GLdepth)) {
/* can't meet depth buffer requirements */
return NULL;
}
if (stencil_bits > 8*sizeof(GLstencil)) {
/* can't meet stencil buffer requirements */
return NULL;
}
if (accum_bits > 8*sizeof(GLaccum)) {
/* can't meet accum buffer requirements */
return NULL;
}
vis = (GLvisual *) calloc( 1, sizeof(GLvisual) );
if (!vis) {
return NULL;
}
vis->RGBAflag = rgb_flag;
vis->DBflag = db_flag;
vis->RedScale = red_scale;
vis->GreenScale = green_scale;
vis->BlueScale = blue_scale;
vis->AlphaScale = alpha_scale;
if (red_scale) {
vis->InvRedScale = 1.0F / red_scale;
}
if (green_scale) {
vis->InvGreenScale = 1.0F / green_scale;
}
if (blue_scale) {
vis->InvBlueScale = 1.0F / blue_scale;
}
if (alpha_scale) {
vis->InvAlphaScale = 1.0F / alpha_scale;
}
vis->IndexBits = index_bits;
vis->DepthBits = depth_bits;
vis->AccumBits = accum_bits;
vis->StencilBits = stencil_bits;
if (red_scale==255.0F && green_scale==255.0F
&& blue_scale==255.0F && alpha_scale==255.0F) {
vis->EightBitColor = GL_TRUE;
}
else {
vis->EightBitColor = GL_FALSE;
}
/* software alpha buffers */
if (alpha_flag) {
vis->FrontAlphaEnabled = GL_TRUE;
if (db_flag) {
vis->BackAlphaEnabled = GL_TRUE;
}
}
return vis;
}
void gl_destroy_visual( GLvisual *vis )
{
free( vis );
}
/*
* Allocate and initialize a GLcontext structure.
* Input: visual - a GLvisual pointer
* sharelist - another context to share display lists with or NULL
* driver_ctx - pointer to device driver's context state struct
* Return: pointer to a new gl_context struct or NULL if error.
*/
GLcontext *gl_create_context( GLvisual *visual,
GLcontext *share_list,
void *driver_ctx )
{
GLcontext *ctx;
GLint i;
/* do some implementation tests */
assert( sizeof(GLbyte) == 1 );
assert( sizeof(GLshort) >= 2 );
assert( sizeof(GLint) >= 4 );
assert( sizeof(GLubyte) == 1 );
assert( sizeof(GLushort) >= 2 );
assert( sizeof(GLuint) >= 4 );
ctx = (GLcontext *) calloc( 1, sizeof(GLcontext) );
if (ctx) {
ctx->DriverCtx = driver_ctx;
ctx->Visual = visual;
ctx->Buffer = NULL;
gl_init_lists();
gl_init_eval(ctx);
ctx->VB = (struct vertex_buffer *) malloc(sizeof(struct vertex_buffer));
if (!ctx->VB) {
free( ctx );
return NULL;
}
gl_init_vb( ctx->VB );
ctx->PB = (struct pixel_buffer *) malloc(sizeof(struct pixel_buffer));
if (!ctx->PB) {
free( ctx->VB );
free( ctx );
return NULL;
}
PB_INIT( ctx->PB, GL_BITMAP );
if (share_list) {
/* share the group of display lists of another context */
ctx->Shared = share_list->Shared;
}
else {
/* allocate new group of display lists */
ctx->Shared = alloc_shared_state();
}
ctx->Shared->RefCount++;
initialize_context( ctx );
if (visual->DBflag) {
ctx->Color.DrawBuffer = GL_BACK;
ctx->Pixel.ReadBuffer = GL_BACK;
}
else {
ctx->Color.DrawBuffer = GL_FRONT;
ctx->Pixel.ReadBuffer = GL_FRONT;
}
#ifdef PROFILE
init_timings( ctx );
#endif
#ifdef GL_VERSION_1_1
ctx->Texture.Proxy1D = gl_alloc_texture_object();
ctx->Texture.Proxy2D = gl_alloc_texture_object();
if (!ctx->Texture.Proxy1D || !ctx->Texture.Proxy2D) {
return NULL;
}
for (i=0;i<MAX_TEXTURE_LEVELS;i++) {
ctx->Texture.Proxy1D->Image[i] = gl_alloc_texture_image();
ctx->Texture.Proxy2D->Image[i] = gl_alloc_texture_image();
if ( !ctx->Texture.Proxy1D->Image[i]
|| !ctx->Texture.Proxy2D->Image[i]) {
return NULL;
}
}
#endif
gl_initialize_api_function_pointers( ctx );
ctx->API = ctx->Exec; /* GL_EXECUTE is default */
}
return ctx;
}
/*
* Destroy a gl_context structure.
*/
void gl_destroy_context( GLcontext *ctx )
{
if (ctx) {
GLint i;
#ifdef PROFILE
if (getenv("MESA_PROFILE")) {
print_timings( ctx );
}
#endif
free( ctx->PB );
free( ctx->VB );
ctx->Shared->RefCount--;
assert(ctx->Shared->RefCount>=0);
if (ctx->Shared->RefCount==0) {
/* free shared state */
free_shared_state( ctx->Shared );
}
#ifdef GL_VERSION_1_1
/* Free proxy texture info */
for (i=0;i<MAX_TEXTURE_LEVELS;i++) {
free( ctx->Texture.Proxy1D->Image[i] );
free( ctx->Texture.Proxy2D->Image[i] );
}
free( ctx->Texture.Proxy1D );
free( ctx->Texture.Proxy2D );
#endif
free( (void *) ctx );
#ifndef THREADS
if (ctx==CC) {
CC = NULL;
}
#endif
}
}
/*
* Create a new framebuffer. A GLframebuffer is a struct which
* encapsulates the depth, stencil and accum buffers and related
* parameters.
* Input: visual - a GLvisual pointer
* Return: pointer to new GLframebuffer struct or NULL if error.
*/
GLframebuffer *gl_create_framebuffer( GLvisual *visual )
{
GLframebuffer *buffer;
buffer = (GLframebuffer *) calloc( 1, sizeof(GLframebuffer) );
if (!buffer) {
return NULL;
}
buffer->Visual = visual;
return buffer;
}
/*
* Free a framebuffer struct and its buffers.
*/
void gl_destroy_framebuffer( GLframebuffer *buffer )
{
if (buffer) {
if (buffer->Depth) {
free( buffer->Depth );
}
if (buffer->Accum) {
free( buffer->Accum );
}
if (buffer->Stencil) {
free( buffer->Stencil );
}
if (buffer->FrontAlpha) {
free( buffer->FrontAlpha );
}
if (buffer->BackAlpha) {
free( buffer->BackAlpha );
}
free(buffer);
}
}
/*
* Set the current context, binding the given frame buffer to the context.
*/
void gl_make_current( GLcontext *ctx, GLframebuffer *buffer )
{
#ifdef THREADS
/* TODO: unbind old buffer from context? */
set_thread_context( ctx );
#else
if (CC && CC->Buffer) {
/* unbind frame buffer from context */
CC->Buffer = NULL;
}
CC = ctx;
#endif
if (ctx && buffer) {
/* TODO: check if ctx and buffer's visual match??? */
ctx->Buffer = buffer; /* Bind the frame buffer to the context */
ctx->NewState = NEW_ALL; /* just to be safe */
gl_update_state( ctx );
}
}
/**********************************************************************/
/***** Miscellaneous functions *****/
/**********************************************************************/
/*
* Copy attribute groups from one context to another.
* Input: src - source context
* dst - destination context
* mask - bitwise OR of GL_*_BIT flags
*/
void gl_copy_context( GLcontext *src, GLcontext *dst, GLuint mask )
{
if (mask & GL_ACCUM_BUFFER_BIT) {
MEMCPY( &dst->Accum, &src->Accum, sizeof(struct gl_accum_attrib) );
}
if (mask & GL_COLOR_BUFFER_BIT) {
MEMCPY( &dst->Color, &src->Color, sizeof(struct gl_colorbuffer_attrib) );
}
if (mask & GL_CURRENT_BIT) {
MEMCPY( &dst->Current, &src->Current, sizeof(struct gl_current_attrib) );
}
if (mask & GL_DEPTH_BUFFER_BIT) {
MEMCPY( &dst->Depth, &src->Depth, sizeof(struct gl_depthbuffer_attrib) );
}
if (mask & GL_ENABLE_BIT) {
/* no op */
}
if (mask & GL_EVAL_BIT) {
MEMCPY( &dst->Eval, &src->Eval, sizeof(struct gl_eval_attrib) );
}
if (mask & GL_FOG_BIT) {
MEMCPY( &dst->Fog, &src->Fog, sizeof(struct gl_fog_attrib) );
}
if (mask & GL_HINT_BIT) {
MEMCPY( &dst->Hint, &src->Hint, sizeof(struct gl_hint_attrib) );
}
if (mask & GL_LIGHTING_BIT) {
MEMCPY( &dst->Light, &src->Light, sizeof(struct gl_light_attrib) );
}
if (mask & GL_LINE_BIT) {
MEMCPY( &dst->Line, &src->Line, sizeof(struct gl_line_attrib) );
}
if (mask & GL_LIST_BIT) {
MEMCPY( &dst->List, &src->List, sizeof(struct gl_list_attrib) );
}
if (mask & GL_PIXEL_MODE_BIT) {
MEMCPY( &dst->Pixel, &src->Pixel, sizeof(struct gl_pixel_attrib) );
}
if (mask & GL_POINT_BIT) {
MEMCPY( &dst->Point, &src->Point, sizeof(struct gl_point_attrib) );
}
if (mask & GL_POLYGON_BIT) {
MEMCPY( &dst->Polygon, &src->Polygon, sizeof(struct gl_polygon_attrib) );
}
if (mask & GL_POLYGON_STIPPLE_BIT) {
MEMCPY( &dst->PolygonStipple, &src->PolygonStipple, 32*sizeof(GLuint) );
}
if (mask & GL_SCISSOR_BIT) {
MEMCPY( &dst->Scissor, &src->Scissor, sizeof(struct gl_scissor_attrib) );
}
if (mask & GL_STENCIL_BUFFER_BIT) {
MEMCPY( &dst->Stencil, &src->Stencil, sizeof(struct gl_stencil_attrib) );
}
if (mask & GL_TEXTURE_BIT) {
MEMCPY( &dst->Texture, &src->Texture, sizeof(struct gl_texture_attrib) );
}
if (mask & GL_TRANSFORM_BIT) {
MEMCPY( &dst->Transform, &src->Transform, sizeof(struct gl_transform_attrib) );
}
if (mask & GL_VIEWPORT_BIT) {
MEMCPY( &dst->Viewport, &src->Viewport, sizeof(struct gl_viewport_attrib) );
}
}
/*
* This function is called when the Mesa user has stumbled into a code
* path which may not be implemented fully or correctly.
*/
void gl_warning( GLcontext *ctx, const char *s )
{
fprintf( stderr, "Mesa Warning: %s\n", s );
fprintf( stderr, "Report to Mesa author" );
}
/*
* This is Mesa's error handler. Normally, all that's done is the updating
* of the current error value. If Mesa is compiled with -DDEBUG or if the
* environment variable "MESA_DEBUG" is defined then a real error message
* is printed to stderr.
* Input: error - the error value
* s - a diagnostic string
*/
void gl_error( GLcontext *ctx, GLenum error, const char *s )
{
GLboolean debug;
#ifdef DEBUG
debug = GL_TRUE;
#else
if (getenv("MESA_DEBUG")) {
debug = GL_TRUE;
}
else {
debug = GL_FALSE;
}
#endif
if (debug) {
char errstr[1000];
switch (error) {
case GL_NO_ERROR:
strcpy( errstr, "GL_NO_ERROR" );
break;
case GL_INVALID_VALUE:
strcpy( errstr, "GL_INVALID_VALUE" );
break;
case GL_INVALID_ENUM:
strcpy( errstr, "GL_INVALID_ENUM" );
break;
case GL_INVALID_OPERATION:
strcpy( errstr, "GL_INVALID_OPERATION" );
break;
case GL_STACK_OVERFLOW:
strcpy( errstr, "GL_STACK_OVERFLOW" );
break;
case GL_STACK_UNDERFLOW:
strcpy( errstr, "GL_STACK_UNDERFLOW" );
break;
case GL_OUT_OF_MEMORY:
strcpy( errstr, "GL_OUT_OF_MEMORY" );
break;
default:
strcpy( errstr, "unknown" );
break;
}
fprintf( stderr, "Mesa Error (%s): %s\n", errstr, s );
}
if (ctx->ErrorValue==GL_NO_ERROR) {
ctx->ErrorValue = error;
}
}
GLenum gl_GetError( GLcontext* ctx )
{
GLenum e;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glGetError" );
return GL_INVALID_OPERATION;
}
e = ctx->ErrorValue;
ctx->ErrorValue = GL_NO_ERROR;
return e;
}
/**********************************************************************/
/***** State update logic *****/
/**********************************************************************/
/*
* Since the device driver may or may not support pixel logic ops we
* have to make some extensive tests to determine whether or not
* software-implemented logic operations have to be used.
*/
static void update_pixel_logic( GLcontext* ctx )
{
if (ctx->Visual->RGBAflag) {
/* RGBA mode blending w/ Logic Op */
if (ctx->Color.BlendEnabled && ctx->Color.BlendEquation==GL_LOGIC_OP) {
if (ctx->Driver.LogicOp
&& (*ctx->Driver.LogicOp)( ctx, ctx->Color.LogicOp )) {
/* Device driver can do logic, don't have to do it in software */
ctx->Color.SWLogicOpEnabled = GL_FALSE;
}
else {
/* Device driver can't do logic op so we do it in software */
ctx->Color.SWLogicOpEnabled = GL_TRUE;
}
}
else {
/* no logic op */
if (ctx->Driver.LogicOp) {
(void) (*ctx->Driver.LogicOp)( ctx, GL_COPY );
}
ctx->Color.SWLogicOpEnabled = GL_FALSE;
}
}
else {
/* CI mode Logic Op */
if (ctx->Color.LogicOpEnabled) {
if (ctx->Driver.LogicOp
&& (*ctx->Driver.LogicOp)( ctx, ctx->Color.LogicOp )) {
/* Device driver can do logic, don't have to do it in software */
ctx->Color.SWLogicOpEnabled = GL_FALSE;
}
else {
/* Device driver can't do logic op so we do it in software */
ctx->Color.SWLogicOpEnabled = GL_TRUE;
}
}
else {
/* no logic op */
if (ctx->Driver.LogicOp) {
(void) (*ctx->Driver.LogicOp)( ctx, GL_COPY );
}
ctx->Color.SWLogicOpEnabled = GL_FALSE;
}
}
}
/*
* Check if software implemented RGBA or Color Index masking is needed.
*/
static void update_pixel_masking( GLcontext* ctx )
{
if (ctx->Visual->RGBAflag) {
if (ctx->Color.ColorMask==0xf) {
/* disable masking */
if (ctx->Driver.ColorMask) {
(void) (*ctx->Driver.ColorMask)( ctx, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
}
ctx->Color.SWmasking = GL_FALSE;
}
else {
/* Ask driver to do color masking, if it can't then
* do it in software
*/
GLboolean red = (ctx->Color.ColorMask & 8) ? GL_TRUE : GL_FALSE;
GLboolean green = (ctx->Color.ColorMask & 4) ? GL_TRUE : GL_FALSE;
GLboolean blue = (ctx->Color.ColorMask & 2) ? GL_TRUE : GL_FALSE;
GLboolean alpha = (ctx->Color.ColorMask & 1) ? GL_TRUE : GL_FALSE;
if (ctx->Driver.ColorMask
&& (*ctx->Driver.ColorMask)( ctx, red, green, blue, alpha )) {
ctx->Color.SWmasking = GL_FALSE;
}
else {
ctx->Color.SWmasking = GL_TRUE;
}
}
}
else {
if (ctx->Color.IndexMask==0xffffffff) {
/* disable masking */
if (ctx->Driver.IndexMask) {
(void) (*ctx->Driver.IndexMask)( ctx, 0xffffffff );
}
ctx->Color.SWmasking = GL_FALSE;
}
else {
/* Ask driver to do index masking, if it can't then
* do it in software
*/
if (ctx->Driver.IndexMask
&& (*ctx->Driver.IndexMask)( ctx, ctx->Color.IndexMask )) {
ctx->Color.SWmasking = GL_FALSE;
}
else {
ctx->Color.SWmasking = GL_TRUE;
}
}
}
}
/*
* Recompute the value of ctx->RasterMask, ctx->ClipMask, etc. according to
* the current context.
*/
static void update_rasterflags( GLcontext* ctx )
{
ctx->RasterMask = 0;
if (ctx->Color.AlphaEnabled) ctx->RasterMask |= ALPHATEST_BIT;
if (ctx->Color.BlendEnabled) ctx->RasterMask |= BLEND_BIT;
if (ctx->Depth.Test) ctx->RasterMask |= DEPTH_BIT;
if (ctx->Fog.Enabled) ctx->RasterMask |= FOG_BIT;
if (ctx->Color.SWLogicOpEnabled) ctx->RasterMask |= LOGIC_OP_BIT;
if (ctx->Scissor.Enabled) ctx->RasterMask |= SCISSOR_BIT;
if (ctx->Stencil.Enabled) ctx->RasterMask |= STENCIL_BIT;
if (ctx->Color.SWmasking) ctx->RasterMask |= MASKING_BIT;
if (ctx->Visual->FrontAlphaEnabled) ctx->RasterMask |= ALPHABUF_BIT;
if (ctx->Visual->BackAlphaEnabled) ctx->RasterMask |= ALPHABUF_BIT;
if ( ctx->Viewport.X<0
|| ctx->Viewport.X + ctx->Viewport.Width > ctx->Buffer->Width
|| ctx->Viewport.Y<0
|| ctx->Viewport.Y + ctx->Viewport.Height > ctx->Buffer->Height) {
ctx->RasterMask |= WINCLIP_BIT;
}
/* check if drawing to front and back buffers */
if (ctx->Color.DrawBuffer==GL_FRONT_AND_BACK) {
ctx->RasterMask |= FRONT_AND_BACK_BIT;
}
/* check if writing to color buffer(s) is disabled */
if (ctx->Color.DrawBuffer==GL_NONE) {
ctx->RasterMask |= NO_DRAW_BIT;
}
else if (ctx->Visual->RGBAflag && ctx->Color.ColorMask==0) {
ctx->RasterMask |= NO_DRAW_BIT;
}
else if (!ctx->Visual->RGBAflag && ctx->Color.IndexMask==0) {
ctx->RasterMask |= NO_DRAW_BIT;
}
/* Recompute ClipMask (what has to be interpolated when clipping) */
ctx->ClipMask = 0;
if (ctx->Texture.Enabled) {
ctx->ClipMask |= CLIP_TEXTURE_BIT;
}
if (ctx->Light.ShadeModel==GL_SMOOTH) {
if (ctx->Visual->RGBAflag) {
ctx->ClipMask |= CLIP_FCOLOR_BIT;
if (ctx->Light.Model.TwoSide) {
ctx->ClipMask |= CLIP_BCOLOR_BIT;
}
}
else {
ctx->ClipMask |= CLIP_FINDEX_BIT;
if (ctx->Light.Model.TwoSide) {
ctx->ClipMask |= CLIP_BINDEX_BIT;
}
}
}
}
/*
* If ctx->NewState is non-zero then this function MUST be called before
* rendering any primitive. Basically, function pointers and miscellaneous
* flags are updated to reflect the current state of the state machine.
*/
void gl_update_state( GLcontext* ctx )
{
if (ctx->NewState & NEW_RASTER_OPS) {
update_pixel_logic(ctx);
update_pixel_masking(ctx);
update_rasterflags(ctx);
}
if (ctx->NewState & NEW_LIGHTING) {
gl_update_lighting(ctx);
if (ctx->Light.ColorMaterialEnabled) {
ctx->Exec.Color4f = gl_ColorMat4f;
ctx->Exec.Color4ub = gl_ColorMat4ub;
}
else {
ctx->Exec.Color4f = gl_Color4f;
if (ctx->Visual->EightBitColor) {
ctx->Exec.Color4ub = gl_Color4ub8bit;
}
else {
ctx->Exec.Color4ub = gl_Color4ub;
}
}
if (!ctx->CompileFlag) {
ctx->API.Color4f = ctx->Exec.Color4f;
ctx->API.Color4ub = ctx->Exec.Color4ub;
}
}
if (ctx->NewState & NEW_TEXTURING) {
gl_update_texture_state(ctx);
}
if (ctx->NewState & (NEW_LIGHTING | NEW_TEXTURING)) {
/* Check if normal vectors are needed */
if (ctx->Light.Enabled
|| (ctx->Texture.GenModeS==GL_SPHERE_MAP
&& (ctx->Texture.TexGenEnabled & S_BIT))
|| (ctx->Texture.GenModeT==GL_SPHERE_MAP
&& (ctx->Texture.TexGenEnabled & T_BIT))) {
ctx->NeedNormals = GL_TRUE;
}
else {
ctx->NeedNormals = GL_FALSE;
}
}
if (ctx->NewState & NEW_RASTER_OPS) {
/* Check if incoming colors can be modified during rasterization */
if (ctx->Fog.Enabled ||
ctx->Texture.Enabled ||
ctx->Color.BlendEnabled ||
ctx->Color.SWmasking ||
ctx->Color.SWLogicOpEnabled) {
ctx->MutablePixels = GL_TRUE;
}
else {
ctx->MutablePixels = GL_FALSE;
}
}
if (ctx->NewState & (NEW_RASTER_OPS | NEW_LIGHTING)) {
/* Check if all pixels generated are likely to be the same color */
if (ctx->Light.ShadeModel==GL_SMOOTH ||
ctx->Light.Enabled ||
ctx->Fog.Enabled ||
ctx->Texture.Enabled ||
ctx->Color.BlendEnabled ||
ctx->Color.SWmasking ||
ctx->Color.SWLogicOpEnabled) {
ctx->MonoPixels = GL_FALSE; /* pixels probably multicolored */
}
else {
/* pixels will all be same color,
* only glColor() can invalidate this.
*/
ctx->MonoPixels = GL_TRUE;
}
}
if (ctx->NewState & NEW_RASTER_OPS) {
/* Setup CullBits bitmask */
ctx->Polygon.CullBits = 0;
if (ctx->Polygon.CullFlag) {
if (ctx->Polygon.CullFaceMode==GL_FRONT ||
ctx->Polygon.CullFaceMode==GL_FRONT_AND_BACK) {
ctx->Polygon.CullBits |= 1;
}
if (ctx->Polygon.CullFaceMode==GL_BACK ||
ctx->Polygon.CullFaceMode==GL_FRONT_AND_BACK) {
ctx->Polygon.CullBits |= 2;
}
}
/* Any Polygon offsets enabled? */
ctx->Polygon.OffsetAny = ctx->Polygon.OffsetPoint ||
ctx->Polygon.OffsetLine ||
ctx->Polygon.OffsetFill;
/* reset Z offsets now */
ctx->PointZoffset = 0;
ctx->LineZoffset = 0;
ctx->PolygonZoffset = 0;
}
if (ctx->NewState & (NEW_RASTER_OPS | NEW_LIGHTING)) {
/* Determine if we can directly call the triangle rasterizer */
if ( ctx->Polygon.Unfilled
|| ctx->Polygon.OffsetAny
|| ctx->Polygon.CullFlag
|| ctx->Light.Model.TwoSide) {
ctx->DirectTriangles = GL_FALSE;
}
else {
ctx->DirectTriangles = GL_TRUE;
}
}
/* update scissor region */
ctx->Buffer->Xmin = 0;
ctx->Buffer->Ymin = 0;
ctx->Buffer->Xmax = ctx->Buffer->Width-1;
ctx->Buffer->Ymax = ctx->Buffer->Height-1;
if (ctx->Scissor.Enabled) {
if (ctx->Scissor.X > ctx->Buffer->Xmin) {
ctx->Buffer->Xmin = ctx->Scissor.X;
}
if (ctx->Scissor.Y > ctx->Buffer->Ymin) {
ctx->Buffer->Ymin = ctx->Scissor.Y;
}
if (ctx->Scissor.X + ctx->Scissor.Width - 1 < ctx->Buffer->Xmax) {
ctx->Buffer->Xmax = ctx->Scissor.X + ctx->Scissor.Width - 1;
}
if (ctx->Scissor.Y + ctx->Scissor.Height - 1 < ctx->Buffer->Ymax) {
ctx->Buffer->Ymax = ctx->Scissor.Y + ctx->Scissor.Height - 1;
}
}
/*
* Update Device Driver interface
*/
if (ctx->NewState & NEW_RASTER_OPS) {
ctx->Driver.AllocDepthBuffer = gl_alloc_depth_buffer;
ctx->Driver.ClearDepthBuffer = gl_clear_depth_buffer;
if (ctx->Depth.Mask) {
switch (ctx->Depth.Func) {
case GL_LESS:
ctx->Driver.DepthTestSpan = gl_depth_test_span_less;
ctx->Driver.DepthTestPixels = gl_depth_test_pixels_less;
break;
case GL_GREATER:
ctx->Driver.DepthTestSpan = gl_depth_test_span_greater;
ctx->Driver.DepthTestPixels = gl_depth_test_pixels_greater;
break;
default:
ctx->Driver.DepthTestSpan = gl_depth_test_span_generic;
ctx->Driver.DepthTestPixels = gl_depth_test_pixels_generic;
}
}
else {
ctx->Driver.DepthTestSpan = gl_depth_test_span_generic;
ctx->Driver.DepthTestPixels = gl_depth_test_pixels_generic;
}
ctx->Driver.ReadDepthSpanFloat = gl_read_depth_span_float;
ctx->Driver.ReadDepthSpanInt = gl_read_depth_span_int;
}
if (ctx->Driver.UpdateState) {
(*ctx->Driver.UpdateState)(ctx);
}
gl_set_point_function(ctx);
gl_set_line_function(ctx);
gl_set_triangle_function(ctx);
gl_set_vertex_function(ctx);
ctx->NewState = 0;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.