From d849d3d30e928f852bf2cfb325dbe8fe59228ab4 Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@ulg.ac.be>
Date: Fri, 4 Jun 2004 02:07:07 +0000
Subject: [PATCH] quick hack to implement "fake transparency" as in xpost
---
Common/Context.h | 1 +
Common/DefaultOptions.h | 2 +
Common/Options.cpp | 13 +++++--
Common/Options.h | 1 +
Fltk/Callbacks.cpp | 4 +-
Fltk/GUI.cpp | 4 +-
Graphics/Draw.cpp | 7 +---
Graphics/Post.cpp | 81 +++++++++++++++++++++++++----------------
8 files changed, 69 insertions(+), 44 deletions(-)
diff --git a/Common/Context.h b/Common/Context.h
index 63adb0f512..3c816514d5 100644
--- a/Common/Context.h
+++ b/Common/Context.h
@@ -108,6 +108,7 @@ public :
int small_axes_pos[2]; // small axes position
int threads, threads_lock; // threads?, lock (should be a mutex...)
int alpha; // enable alpha blending
+ int fake_transparency; // use fake transparency (a la xpost)
double zoom_factor; // mouse2 zoom coefficient
int fontsize; // font size for fltk UI
diff --git a/Common/DefaultOptions.h b/Common/DefaultOptions.h
index 496f8b4a25..7678da05e5 100644
--- a/Common/DefaultOptions.h
+++ b/Common/DefaultOptions.h
@@ -445,6 +445,8 @@ StringXNumber GeneralOptions_Number[] = {
{ F|O, "DoubleBuffer" , opt_general_double_buffer , 1. ,
"Use a double buffered graphic window (on Unix, should be set to 0 when working on a remote host without GLX)" },
+ { F|O, "FakeTransparency" , opt_general_fake_transparency , 0. ,
+ "Use fake transparency (cheaper than the real thing, but incorrect)" },
{ F|O, "FastRedraw" , opt_general_fast_redraw , 1. ,
"Fast redraw (no mesh or view display) when interacting with the model" },
{ F|S, "FontSize" , opt_general_fontsize , 12. ,
diff --git a/Common/Options.cpp b/Common/Options.cpp
index 73b2ffe1da..48fecf3f3a 100644
--- a/Common/Options.cpp
+++ b/Common/Options.cpp
@@ -1,4 +1,4 @@
-// $Id: Options.cpp,v 1.163 2004-06-02 00:16:30 geuzaine Exp $
+// $Id: Options.cpp,v 1.164 2004-06-04 02:07:06 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -2327,11 +2327,18 @@ double opt_general_alpha_blending(OPT_ARGS_NUM)
{
if(action & GMSH_SET)
CTX.alpha = (int)val;
+ return CTX.alpha;
+}
+
+double opt_general_fake_transparency(OPT_ARGS_NUM)
+{
+ if(action & GMSH_SET)
+ CTX.fake_transparency = (int)val;
#if defined(HAVE_FLTK)
if(WID && (action & GMSH_GUI))
- WID->gen_butt[4]->value(CTX.alpha);
+ WID->gen_butt[4]->value(CTX.fake_transparency);
#endif
- return CTX.alpha;
+ return CTX.fake_transparency;
}
double opt_general_vector_type(OPT_ARGS_NUM)
diff --git a/Common/Options.h b/Common/Options.h
index 4650393da4..d26d916b65 100644
--- a/Common/Options.h
+++ b/Common/Options.h
@@ -247,6 +247,7 @@ double opt_general_small_axes_position1(OPT_ARGS_NUM);
double opt_general_quadric_subdivisions(OPT_ARGS_NUM);
double opt_general_double_buffer(OPT_ARGS_NUM);
double opt_general_alpha_blending(OPT_ARGS_NUM);
+double opt_general_fake_transparency(OPT_ARGS_NUM);
double opt_general_vector_type(OPT_ARGS_NUM);
double opt_general_arrow_head_radius(OPT_ARGS_NUM);
double opt_general_arrow_stem_length(OPT_ARGS_NUM);
diff --git a/Fltk/Callbacks.cpp b/Fltk/Callbacks.cpp
index bb1d8d9e47..10f0d7e29f 100644
--- a/Fltk/Callbacks.cpp
+++ b/Fltk/Callbacks.cpp
@@ -1,4 +1,4 @@
-// $Id: Callbacks.cpp,v 1.245 2004-06-01 22:16:24 geuzaine Exp $
+// $Id: Callbacks.cpp,v 1.246 2004-06-04 02:07:06 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -858,7 +858,7 @@ void general_options_ok_cb(CALLBACK_ARGS)
opt_general_fast_redraw(0, GMSH_SET, WID->gen_butt[2]->value());
if(opt_general_double_buffer(0, GMSH_GET, 0) != WID->gen_butt[3]->value())
opt_general_double_buffer(0, GMSH_SET, WID->gen_butt[3]->value());
- opt_general_alpha_blending(0, GMSH_SET, WID->gen_butt[4]->value());
+ opt_general_fake_transparency(0, GMSH_SET, WID->gen_butt[4]->value());
opt_general_trackball(0, GMSH_SET, WID->gen_butt[5]->value());
opt_general_terminal(0, GMSH_SET, WID->gen_butt[7]->value());
double sessionrc = opt_general_session_save(0, GMSH_GET, 0);
diff --git a/Fltk/GUI.cpp b/Fltk/GUI.cpp
index 97a9bb2136..7ffdd303d4 100644
--- a/Fltk/GUI.cpp
+++ b/Fltk/GUI.cpp
@@ -1,4 +1,4 @@
-// $Id: GUI.cpp,v 1.313 2004-06-02 00:16:30 geuzaine Exp $
+// $Id: GUI.cpp,v 1.314 2004-06-04 02:07:06 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -1458,7 +1458,7 @@ void GUI::create_option_window()
gen_butt[1] = new Fl_Check_Button(2 * WB, 2 * WB + 3 * BH, BW, BH, "Show small axes");
gen_butt[2] = new Fl_Check_Button(2 * WB, 2 * WB + 4 * BH, BW, BH, "Enable fast redraw");
gen_butt[3] = new Fl_Check_Button(2 * WB, 2 * WB + 5 * BH, BW, BH, "Enable double buffering");
- gen_butt[4] = new Fl_Check_Button(2 * WB, 2 * WB + 6 * BH, BW, BH, "Enable alpha blending");
+ gen_butt[4] = new Fl_Check_Button(2 * WB, 2 * WB + 6 * BH, BW, BH, "Use fake transparency");
gen_butt[5] = new Fl_Check_Button(2 * WB, 2 * WB + 7 * BH, BW, BH, "Use trackball rotation mode");
for(i = 0; i < 6; i++) {
gen_butt[i]->type(FL_TOGGLE_BUTTON);
diff --git a/Graphics/Draw.cpp b/Graphics/Draw.cpp
index 2d21f808d1..f0706ab940 100644
--- a/Graphics/Draw.cpp
+++ b/Graphics/Draw.cpp
@@ -1,4 +1,4 @@
-// $Id: Draw.cpp,v 1.58 2004-06-02 15:04:33 geuzaine Exp $
+// $Id: Draw.cpp,v 1.59 2004-06-04 02:07:06 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -36,14 +36,9 @@ extern Mesh M;
void Draw3d(void)
{
- if(CTX.alpha) {
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glEnable(GL_BLEND);
- }
glPolygonOffset(1.0, 1.0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
- glDisable(GL_CULL_FACE);
InitRenderModel();
diff --git a/Graphics/Post.cpp b/Graphics/Post.cpp
index 44e9eb3ae2..b19e6a5140 100644
--- a/Graphics/Post.cpp
+++ b/Graphics/Post.cpp
@@ -1,4 +1,4 @@
-// $Id: Post.cpp,v 1.67 2004-06-01 16:49:01 geuzaine Exp $
+// $Id: Post.cpp,v 1.68 2004-06-04 02:07:07 geuzaine Exp $
//
// Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
//
@@ -407,36 +407,48 @@ void Draw_Post(void)
break;
}
- // if we don't use vertex arrays, do a simple sort of
- // transparent views (hybrid views will be sorted incorrectly;
- // use Plugin(DecomposeInSimplex) and View->Combine to do remedy
- // this limitation)
- if(!CTX.post.vertex_arrays && CTX.alpha && ColorTable_IsAlpha(&v->CT) &&
- v->DrawScalars && (changedEye() || v->Changed)) {
- Msg(DEBUG, "Sorting View[%d] for transparency (NO vertex array)", v->Index);
- if(v->NbST && v->DrawTriangles) {
- nb = List_Nbr(v->ST) / v->NbST;
- qsort(v->ST->array, v->NbST, nb * sizeof(double), compareEye3Nodes);
+ // initialize alpha blending for transparency
+ if(CTX.alpha && ColorTable_IsAlpha(&v->CT)){
+ if(CTX.fake_transparency){ // "a la xpost"
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+ glEnable(GL_BLEND);
+ glDisable(GL_DEPTH_TEST);
}
- if(v->NbSQ && v->DrawQuadrangles) {
- nb = List_Nbr(v->SQ) / v->NbSQ;
- qsort(v->SQ->array, v->NbSQ, nb * sizeof(double), compareEye4Nodes);
- }
- if(v->NbSS && v->DrawTetrahedra) {
- nb = List_Nbr(v->SS) / v->NbSS;
- qsort(v->SS->array, v->NbSS, nb * sizeof(double), compareEye4Nodes);
- }
- if(v->NbSH && v->DrawHexahedra) {
- nb = List_Nbr(v->SH) / v->NbSH;
- qsort(v->SH->array, v->NbSH, nb * sizeof(double), compareEye8Nodes);
- }
- if(v->NbSI && v->DrawPrisms) {
- nb = List_Nbr(v->SI) / v->NbSI;
- qsort(v->SI->array, v->NbSI, nb * sizeof(double), compareEye6Nodes);
- }
- if(v->NbSY && v->DrawPyramids) {
- nb = List_Nbr(v->SY) / v->NbSY;
- qsort(v->SY->array, v->NbSY, nb * sizeof(double), compareEye5Nodes);
+ else{
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnable(GL_BLEND);
+ // if we don't use vertex arrays, do a simple sort of
+ // transparent views (hybrid views will be sorted incorrectly;
+ // use Plugin(DecomposeInSimplex) and View->Combine to do remedy
+ // this limitation)
+ if(!CTX.post.vertex_arrays && v->DrawScalars &&
+ (changedEye() || v->Changed)) {
+ Msg(DEBUG, "Sorting View[%d] for transparency (NO vertex array)", v->Index);
+ if(v->NbST && v->DrawTriangles) {
+ nb = List_Nbr(v->ST) / v->NbST;
+ qsort(v->ST->array, v->NbST, nb * sizeof(double), compareEye3Nodes);
+ }
+ if(v->NbSQ && v->DrawQuadrangles) {
+ nb = List_Nbr(v->SQ) / v->NbSQ;
+ qsort(v->SQ->array, v->NbSQ, nb * sizeof(double), compareEye4Nodes);
+ }
+ if(v->NbSS && v->DrawTetrahedra) {
+ nb = List_Nbr(v->SS) / v->NbSS;
+ qsort(v->SS->array, v->NbSS, nb * sizeof(double), compareEye4Nodes);
+ }
+ if(v->NbSH && v->DrawHexahedra) {
+ nb = List_Nbr(v->SH) / v->NbSH;
+ qsort(v->SH->array, v->NbSH, nb * sizeof(double), compareEye8Nodes);
+ }
+ if(v->NbSI && v->DrawPrisms) {
+ nb = List_Nbr(v->SI) / v->NbSI;
+ qsort(v->SI->array, v->NbSI, nb * sizeof(double), compareEye6Nodes);
+ }
+ if(v->NbSY && v->DrawPyramids) {
+ nb = List_Nbr(v->SY) / v->NbSY;
+ qsort(v->SY->array, v->NbSY, nb * sizeof(double), compareEye5Nodes);
+ }
+ }
}
}
@@ -529,7 +541,8 @@ void Draw_Post(void)
if(v->TriVertexArray && v->TriVertexArray->num){
- if(CTX.alpha && ColorTable_IsAlpha(&v->CT) && (changedEye() || v->Changed)){
+ if(CTX.alpha && ColorTable_IsAlpha(&v->CT) && !CTX.fake_transparency &&
+ (changedEye() || v->Changed)){
Msg(DEBUG, "Sorting View[%d] for transparency (WITH vertex array)", v->Index);
v->TriVertexArray->sort(storedEye);
}
@@ -560,6 +573,12 @@ void Draw_Post(void)
glColor4ubv((GLubyte *) & CTX.color.text);
Draw_Text2D3D(3, v->TimeStep, v->NbT3, v->T3D, v->T3C);
}
+
+ // reset alpha blending
+ if(CTX.alpha){
+ glDisable(GL_BLEND);
+ glEnable(GL_DEPTH_TEST);
+ }
v->Changed = 0;
}
--
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