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| OpenGL Type Traits |
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swiftcoder Member since: 7/3/2003 From: Boston, MA, United States |
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 Posted - 10/1/2008 8:46:22 AM |
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| A nice trick, thanks! |
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mrbastard Member since: 10/9/2000 From: Nottingham, United Kingdom |
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Posted - 10/1/2008 9:16:21 AM |
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Quote: seconded  |
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DeadXorAlive Member since: 7/24/2005 From: Utrecht, Netherlands |
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Posted - 10/1/2008 11:54:10 AM |
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| I like it, simple and effective. This is how it would look in D: template opengl_traits(T : uint) { enum opengl_traits = GL_UNSIGNED_INT; } void vertexPointer(T)(GLint size, GLsizei stride, const T* pointer) { glVertexPointer(size, stride, opengl_traits!(T), pointer); } |
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noe Member since: 11/10/2003 From: Poznan, Poland |
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Posted - 10/3/2008 10:26:54 AM |
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| thanks, I am glad you like it :) just wanted to add that in my code I actually have one more enum in opengl_traits specializations GL_SIZE: template<> struct opengl_traits<unsigned int> { enum {GL_TYPE = GL_UNSIGNED_INT, GL_SIZE = 1}; }; template<> struct opengl_traits<unsigned short> { enum {GL_TYPE = GL_UNSIGNED_SHORT, GL_SIZE = 1}; }; template<> struct opengl_traits<float> { enum {GL_TYPE = GL_FLOAT, GL_SIZE = 1}; }; and in renderer class: template <class T> void vertexSource(const T* ptr, GLsizei stride = 0) { glVertexPointer(opengl_traits<T>::GL_SIZE, opengl_traits<T>::GL_TYPE, stride, ptr); } this of course doesn't look good at first but consider this : // vec3.h - just example template <class T> class Vec3 { T x, y, z; }; // opengltraits.h // this is super cool imho ;) template <class T> struct opengl_traits<Vec3<T> > { enum { GL_TYPE = opengl_traits<T>::GL_TYPE, // this "redirect" to actual definition GL_SIZE = 3 // this is of course number of components in Vec3 }; }; this ONE templated traits definition enabled Vec3<T> deduction support for all previously defined basic types, so now: vector<Vec3<float> > vertices; vertexPointer(&vertices[0]); voila :) in fact I have a few traits more, for 2/4 d vectors and colors |
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