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Fix a number of point size attenuation problems.

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Move size clamping into the rasterization function.
This commit is contained in:
Brian Paul
2005-10-07 03:56:29 +00:00
parent 9dd973ec3b
commit dfe7aedf84
5 changed files with 115 additions and 85 deletions
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84
src/mesa/main/points.c
View File

@@ -5,9 +5,9 @@
/*
* Mesa 3-D graphics library
* Version: 6.2
* Version: 6.5
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2005 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"),
@@ -37,17 +37,9 @@
/**
* Set the point size.
*
* \param size pointer diameter.
*
* Set current point size.
* \param size point diameter in pixels
* \sa glPointSize().
*
* Verifies the parameter and updates gl_point_attrib::Size. On a change,
* flushes the vertices, updates the clamped point size and marks the
* DD_POINT_SIZE flag in __GLcontextRec::_TriangleCaps for the drivers if the
* size is different from one. Notifies the driver via
* the dd_function_table::PointSize callback.
*/
void GLAPIENTRY
_mesa_PointSize( GLfloat size )
@@ -65,17 +57,9 @@ _mesa_PointSize( GLfloat size )
FLUSH_VERTICES(ctx, _NEW_POINT);
ctx->Point.Size = size;
ctx->Point._Size = CLAMP(size,
ctx->Const.MinPointSize,
ctx->Const.MaxPointSize);
if (ctx->Point._Size == 1.0F)
ctx->_TriangleCaps &= ~DD_POINT_SIZE;
else
ctx->_TriangleCaps |= DD_POINT_SIZE;
if (ctx->Driver.PointSize)
(*ctx->Driver.PointSize)(ctx, size);
ctx->Driver.PointSize(ctx, size);
}
@@ -127,24 +111,10 @@ _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
switch (pname) {
case GL_DISTANCE_ATTENUATION_EXT:
if (ctx->Extensions.EXT_point_parameters) {
const GLboolean tmp = ctx->Point._Attenuated;
if (TEST_EQ_3V(ctx->Point.Params, params))
return;
FLUSH_VERTICES(ctx, _NEW_POINT);
COPY_3V(ctx->Point.Params, params);
/* Update several derived values now. This likely to be
* more efficient than trying to catch this statechange in
* state.c.
*/
ctx->Point._Attenuated = (params[0] != 1.0 ||
params[1] != 0.0 ||
params[2] != 0.0);
if (tmp != ctx->Point._Attenuated) {
ctx->_TriangleCaps ^= DD_POINT_ATTEN;
}
}
else {
_mesa_error(ctx, GL_INVALID_ENUM,
@@ -260,6 +230,37 @@ _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
#endif
/**
* Update derived point-related state.
*/
void
_mesa_update_point(GLcontext *ctx)
{
/* clamp to user-specified limits now, clamp to ctx->Const.Min/Max
* limits during rasterization.
*/
ctx->Point._Size = CLAMP(ctx->Point.Size,
ctx->Point.MinSize,
ctx->Point.MaxSize);
if (ctx->Point._Size == 1.0F)
ctx->_TriangleCaps &= ~DD_POINT_SIZE;
else
ctx->_TriangleCaps |= DD_POINT_SIZE;
ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
ctx->Point.Params[1] != 0.0 ||
ctx->Point.Params[2] != 0.0);
if (ctx->Point._Attenuated)
ctx->_TriangleCaps |= DD_POINT_ATTEN;
else
ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
}
/**
* Initialize the context point state.
*
@@ -268,11 +269,11 @@ _mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params)
* Initializes __GLcontextRec::Point and point related constants in
* __GLcontextRec::Const.
*/
void _mesa_init_point( GLcontext * ctx )
void
_mesa_init_point(GLcontext *ctx)
{
int i;
GLuint i;
/* Point group */
ctx->Point.SmoothFlag = GL_FALSE;
ctx->Point.Size = 1.0;
ctx->Point._Size = 1.0;
@@ -281,12 +282,13 @@ void _mesa_init_point( GLcontext * ctx )
ctx->Point.Params[2] = 0.0;
ctx->Point._Attenuated = GL_FALSE;
ctx->Point.MinSize = 0.0;
ctx->Point.MaxSize = ctx->Const.MaxPointSize;
ctx->Point.MaxSize
= MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
ctx->Point.Threshold = 1.0;
ctx->Point.PointSprite = GL_FALSE; /* GL_ARB_point_sprite / GL_NV_point_sprite */
ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
for (i = 0; i < MAX_TEXTURE_UNITS; i++) {
ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB_point_sprite / GL_NV_point_sprite */
ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
}
}

7
src/mesa/main/points.h
View File

@@ -5,9 +5,9 @@
/*
* Mesa 3-D graphics library
* Version: 4.1
* Version: 6.5
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2005 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"),
@@ -50,6 +50,9 @@ _mesa_PointParameterfEXT( GLenum pname, GLfloat param );
extern void GLAPIENTRY
_mesa_PointParameterfvEXT( GLenum pname, const GLfloat *params );
extern void
_mesa_update_point(GLcontext *ctx);
extern void
_mesa_init_point( GLcontext * ctx );

3
src/mesa/main/state.c
View File

@@ -987,6 +987,9 @@ _mesa_update_state( GLcontext *ctx )
if (new_state & (_NEW_SCISSOR|_NEW_BUFFERS))
_mesa_update_draw_buffer_bounds( ctx );
if (new_state & _NEW_POINT)
_mesa_update_point( ctx );
if (new_state & _NEW_POLYGON)
_mesa_update_polygon( ctx );

61
src/mesa/swrast/s_pointtemp.h
View File

@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.3
* Version: 6.5
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2005 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"),
@@ -153,28 +153,44 @@ NAME ( GLcontext *ctx, const SWvertex *vert )
span->arrayMask |= SPAN_TEXTURE;
#endif
/* Compute point size if not known to be one */
#if FLAGS & ATTENUATE
if (vert->pointSize >= ctx->Point.Threshold) {
size = MIN2(vert->pointSize, ctx->Point.MaxSize);
/* first, clamp attenuated size to the user-specifed range */
size = CLAMP(vert->pointSize, ctx->Point.MinSize, ctx->Point.MaxSize);
#if (FLAGS & RGBA) && (FLAGS & SMOOTH)
/* only if multisampling, compute the fade factor */
if (ctx->Multisample.Enabled) {
if (vert->pointSize >= ctx->Point.Threshold) {
alphaAtten = 1.0F;
#endif
}
else {
#if (FLAGS & RGBA) && (FLAGS & SMOOTH)
GLfloat dsize = vert->pointSize / ctx->Point.Threshold;
alphaAtten = dsize * dsize;
#endif
size = MAX2(ctx->Point.Threshold, ctx->Point.MinSize);
}
}
else {
alphaAtten = 1.0;
}
#endif
#elif FLAGS & (LARGE | SMOOTH | SPRITE)
size = ctx->Point._Size;
/* constant, non-attenuated size */
size = ctx->Point._Size; /* this is already clamped */
#endif
#if FLAGS & (ATTENUATE | LARGE | SMOOTH | SPRITE)
/*
* Multi-pixel points
*/
/***
*** Multi-pixel points
***/
/* do final clamping now */
if (ctx->Point.SmoothFlag) {
size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA);
}
else {
size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
}
{{
GLint x, y;
const GLfloat radius = 0.5F * size;
@@ -312,20 +328,21 @@ NAME ( GLcontext *ctx, const SWvertex *vert )
if (ctx->Texture.Unit[u]._ReallyEnabled) {
if (ctx->Point.CoordReplace[u]) {
GLfloat s = 0.5F + (x + 0.5F - vert->win[0]) / size;
GLfloat t;
GLfloat t, r;
if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
t = 0.5F + (y + 0.5F - vert->win[1]) / size;
else /* GL_UPPER_LEFT */
t = 0.5F - (y + 0.5F - vert->win[1]) / size;
if (ctx->Point.SpriteRMode == GL_ZERO)
r = 0.0F;
else if (ctx->Point.SpriteRMode == GL_S)
r = vert->texcoord[u][0];
else /* GL_R */
r = vert->texcoord[u][2];
span->array->texcoords[u][count][0] = s;
span->array->texcoords[u][count][1] = t;
span->array->texcoords[u][count][2] = r;
span->array->texcoords[u][count][3] = 1.0F;
if (ctx->Point.SpriteRMode == GL_ZERO)
span->array->texcoords[u][count][2] = 0.0F;
else if (ctx->Point.SpriteRMode == GL_S)
span->array->texcoords[u][count][2] = vert->texcoord[u][0];
else /* GL_R */
span->array->texcoords[u][count][2] = vert->texcoord[u][2];
}
else {
COPY_4V(span->array->texcoords[u][count], vert->texcoord[u]);
@@ -345,9 +362,9 @@ NAME ( GLcontext *ctx, const SWvertex *vert )
#else /* LARGE | ATTENUATE | SMOOTH | SPRITE */
/*
* Single-pixel points
*/
/***
*** Single-pixel points
***/
{{
GLuint count;

37
src/mesa/tnl/t_vb_points.c
View File

@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.1
* Version: 6.5
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2005 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"),
@@ -38,11 +38,14 @@ struct point_stage_data {
#define POINT_STAGE_DATA(stage) ((struct point_stage_data *)stage->privatePtr)
/*
* Compute attenuated point sizes
/**
* Compute point size for each vertex from the vertex eye-space Z
* coordinate and the point size attenuation factors.
* Only done when point size attenuation is enabled and vertex program is
* disabled.
*/
static GLboolean run_point_stage( GLcontext *ctx,
struct tnl_pipeline_stage *stage )
static GLboolean
run_point_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
{
if (ctx->Point._Attenuated && !ctx->VertexProgram._Enabled) {
struct point_stage_data *store = POINT_STAGE_DATA(stage);
@@ -51,14 +54,15 @@ static GLboolean run_point_stage( GLcontext *ctx,
const GLfloat p0 = ctx->Point.Params[0];
const GLfloat p1 = ctx->Point.Params[1];
const GLfloat p2 = ctx->Point.Params[2];
const GLfloat pointSize = ctx->Point._Size;
const GLfloat pointSize = ctx->Point.Size;
GLfloat (*size)[4] = store->PointSize.data;
GLuint i;
for (i = 0; i < VB->Count; i++) {
const GLfloat dist = -eye[i][2];
/* GLfloat dist = SQRTF(pos[0]*pos[0]+pos[1]*pos[1]+pos[2]*pos[2]);*/
size[i][0] = pointSize / (p0 + dist * (p1 + dist * p2));
const GLfloat dist = FABSF(eye[i][2]);
const GLfloat q = p0 + dist * (p1 + dist * p2);
const GLfloat atten = (q != 0.0) ? SQRTF(1.0 / q) : 1.0;
size[i][0] = pointSize * atten; /* clamping done in rasterization */
}
VB->PointSizePtr = &store->PointSize;
@@ -69,13 +73,12 @@ static GLboolean run_point_stage( GLcontext *ctx,
}
static GLboolean alloc_point_data( GLcontext *ctx,
struct tnl_pipeline_stage *stage )
static GLboolean
alloc_point_data(GLcontext *ctx, struct tnl_pipeline_stage *stage)
{
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
struct point_stage_data *store;
stage->privatePtr = MALLOC(sizeof(*store));
stage->privatePtr = _mesa_malloc(sizeof(*store));
store = POINT_STAGE_DATA(stage);
if (!store)
return GL_FALSE;
@@ -85,16 +88,18 @@ static GLboolean alloc_point_data( GLcontext *ctx,
}
static void free_point_data( struct tnl_pipeline_stage *stage )
static void
free_point_data(struct tnl_pipeline_stage *stage)
{
struct point_stage_data *store = POINT_STAGE_DATA(stage);
if (store) {
_mesa_vector4f_free( &store->PointSize );
FREE( store );
_mesa_free( store );
stage->privatePtr = NULL;
}
}
const struct tnl_pipeline_stage _tnl_point_attenuation_stage =
{
"point size attenuation", /* name */