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Category Archives: Programming
Live Coding
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Les Sampler States OpenGL 3.3: Configurer les Unités de Texture
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Programming – Misc Links
Petite librairie pour le rendu de texte en mode bitmap avec OpenGL 3+ (core profile): VSFL – Very Simple Font Library Nouveau language de scripting. A tester un de ces quatres (dans une autre vie surtout!) dans GeeXLab: Cyrus Script Share PostTwitterFacebook
offsetof macro in C
I just discovered this macro available in C: offsetof. Here is an simple example: struct { char a; int b; char c; } example; struct example s1; unsigned int offset; offset = (unsigned int)(&(((example *)(0))->b));struct { char a; int b; char c; } example; struct example s1; unsigned int offset; offset = (unsigned […]
FreeImage: Erreur de Compilation Sous Ubuntu 10.10
La compilation de la librairie FreeImage 3.14.1 sous Ubuntu 10.10 gènère cette erreur: In file included from Source/OpenEXR/IlmImf/ImfChromaticities.h:47, from Source/OpenEXR/./IlmImf/ImfChromaticities.cpp:43: Source/OpenEXR/Imath/ImathMatrix.h: In constructor ‘Imath::Matrix44::Matrix44() [with T = float]’: Source/OpenEXR/./IlmImf/ImfChromaticities.cpp:110: instantiated from here Source/OpenEXR/Imath/ImathMatrix.h:1813: error: ‘memset’ was not declared in this scope Share PostTwitterFacebook
Geometry Instancing en OpenGL: le Presque Retour!
80,000,000 de polygones… c’est cool l’instancing! Share PostTwitterFacebook
(GeeXLab) Bump Mapping et Self Shadow
Bump mapping – front face Share PostTwitterFacebook
HowTo: Matrice de Projection Perspective en OpenGL
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HowTo: Solutionner l’Erreur “The application failed to initialize properly (0xc0150002)”
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Depth of Field
Ces derniers jours j’ai fait quelques tests de Depth Of Field (DoF ou Profondeur de Champ) avec le nouveau Demoniak3D mais je ne suis pas satisfait du resultat car j’ai encore quelques petits soucis pour controler le focus (la zone du champ de vision qui est nette). Le Depth of field est fait dans une […]
Gamma Correction
I’ve coded today a small gamma correction filter in Smode. I’ll talk about gamma correction a little bit more very soon with a Demoniak3D demo. Here is the result on a simple scene: a teapot lit with a Phong shader. The following image shows the rendering of the scene done in the usual manner, I […]
Multithreaded Build with Visual Studio 2005
Under Visual Studio 2005 (VC8), you can enable the multithreaded build of projects. This great feature makes it possible to use several CPUs to build your projects. This is a per-project setting and it’s done in command line: /MPx where x is the number of cores you want to use. Example: /MP2 to use 2 […]
Saturate function in GLSL
During the conversion of shaders written in Cg/HLSL, we often find the saturate() function. This function is not valid in GLSL even though on NVIDIA, the GLSL compiler accepts it (do not forget that NVIDIA’s GLSL compiler is based on Cg compiler). But ATI’s GLSL compiler will reject saturate() with a nice error. This function […]
Velvet Shader Preview
[French] Un petit shader GLSL de velour (velvet en anglais) ça vous dit? Et bien en voilà un, tout du moins un aperçu de celui que je viens de coder pour les besoins d’une démo avec le logiciel Smode. Smode… Un pur soft pour produire de la démo. Et le truc cool c’est les démos […]
GLSL float to RGBA8 encoder
Packing a [0-1] float value into a 4D vector where each component will be a 8-bits integer: vec4 packFloatToVec4i(const float value) { const vec4 bitSh = vec4(256.0*256.0*256.0, 256.0*256.0, 256.0, 1.0); const vec4 bitMsk = vec4(0.0, 1.0/256.0, 1.0/256.0, 1.0/256.0); vec4 res = fract(value * bitSh); res -= res.xxyz * bitMsk; return res; } Unpacking a [0-1] […]
Better, smaller and faster random number generator
I found this cool random generator on rgba’s website. rgba is a wellknown demoscene group specialized in 4k prods. This random generator is used in their prods: static unsigned int mirand = 1; float sfrand( void ) { unsigned int a; mirand *= 16807; a = (mirand&0x007fffff) | 0x40000000; return( *((float*)&a) – 3.0f ); } […]
Small Log System
Here is a small piece of code that can be useful if you need to quickly generate traces (or log) in your apps: class cLog { public: cLog(char *logfile){}; static void trace(const char *s) { if(s) log << s << std::endl; }; static std::ofstream log; }; std::ofstream cLog::log(“c:\\app_log.txt”); Just use it as follows: cLog::trace(“this is […]
Multithreading et Lecture du Clavier
La programmation multithreading est un monde à part et il faut bien en être conscient. Dans une des demos sur laquelle je bosse en ce moment, il y a deux threads: le thread principal qui s’occupe de la gestion des messages de la fenêtre via la classique pompe à message GetMessage() et le thread de […]
GPU: un MONSTRE de puissance en virgule flottante
Voici un petit résumé de l’article suivant: GPGPU: far more important than you think. Think 10x a CPU’s performance. Share PostTwitterFacebook