92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
/**
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* =========================================================================
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* File : ogl_shader.h
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* Project : 0 A.D.
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* Description : load and link together shaders; provides hotload support.
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* =========================================================================
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*/
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#ifndef INCLUDED_OGL_SHADER
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#define INCLUDED_OGL_SHADER
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#include "lib/res/handle.h"
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#include "lib/ogl.h"
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namespace ERR
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{
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const LibError SHDR_CREATE = -120200;
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const LibError SHDR_COMPILE = -120201;
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const LibError SHDR_NO_SHADER = -120202;
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const LibError SHDR_LINK = -120203;
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const LibError SHDR_NO_PROGRAM = -120204;
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}
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/*
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Encapsulate shader objects into handles, which transparently enables sharing
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of shader source files between programs as well as reloading shaders at
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runtime.
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NOTE: Only use functions form this module after verifying that the required
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extensions are available, or all bets are off.
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*/
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/**
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* Create, load and compile a shader object.
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*
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* @param pathname location of the file containing the shader's source code.
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* @param type e.g. GL_VERTEX_SHADER_ARB.
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**/
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Handle ogl_shader_load(const VfsPath& pathname, GLenum type);
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/**
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* Free all resources associated with the given handle
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* (subject to reference counting).
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**/
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void ogl_shader_free(Handle& h);
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/**
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* Attach a shader to the given OpenGL program.
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**/
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LibError ogl_shader_attach(GLhandleARB program, Handle& h);
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/*
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Encapsulate program objects into handles.
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*/
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/**
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* Load a program object.
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*
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* @param pathname XML file describing the program.
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*
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* note: Shader objects are loaded and attached automatically.
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**/
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Handle ogl_program_load(const char* pathname);
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/**
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* Free all resources associated with the given program handle.
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* (subject to reference counting).
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**/
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void ogl_program_free(Handle& h);
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/**
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* Activate the program (glUseProgramObjectARB).
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*
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* @param h may be 0, in which case program objects are disabled.
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**/
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LibError ogl_program_use(Handle h);
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/**
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* Query uniform information
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**/
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GLint ogl_program_get_uniform_location(Handle h, const char* name);
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/**
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* Query vertex attribute information
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**/
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GLint ogl_program_get_attrib_location(Handle h, const char* name);
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#endif // INCLUDED_OGL_SHADER
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