OOOpenGLExtensionManager.h

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/*
 
OOOpenGLExtensionManager.h
 
Handles checking for and using OpenGL extensions and related information.
 
This is thread safe, except for initialization; that is, +sharedManager should
be called from the main thread at an early point. The OpenGL context must be
set up by then.
 
 
Copyright (C) 2007-2013 Jens Ayton and contributors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
 
#import "OOCocoa.h"
#import "OOOpenGL.h"
#import "OOFunctionAttributes.h"
#import "OOTypes.h"
 
 
#ifndef OO_SHADERS
#ifdef NO_SHADERS
#define OO_SHADERS      0
#else
#define OO_SHADERS      1
#endif
#endif
 
 
#if OO_SHADERS
 
// Certain extensions are required for shader support.
#ifndef GL_ARB_multitexture
#warning NO_SHADERS not defined and GL_ARB_multitexture not defined; if possible, use a newer version of glext.h.
#endif
 
#ifndef GL_ARB_shader_objects
#warning NO_SHADERS not defined and GL_ARB_shader_objects not defined; if possible, use a newer version of glext.h.
#endif
 
#ifndef GL_ARB_shading_language_100
#warning NO_SHADERS not defined and GL_ARB_shading_language_100 not defined; if possible, use a newer version of glext.h.
#endif
 
#ifndef GL_ARB_fragment_shader
#warning NO_SHADERS not defined and GL_ARB_fragment_shader not defined; if possible, use a newer version of glext.h.
#endif
 
#ifndef GL_ARB_vertex_shader
#warning NO_SHADERS not defined and GL_ARB_vertex_shader not defined; if possible, use a newer version of glext.h.
#endif
 
#endif //OO_SHADERS
 
 
#if GL_ARB_vertex_buffer_object
#define OO_USE_VBO              0   // Disabled due to crashes on certain systems (and limited VBO use)
#else
#define OO_USE_VBO              0
#warning Building without vertex buffer object support, are your OpenGL headers up to date?
#endif
 
 
#if GL_EXT_framebuffer_object
#define OO_USE_FBO              1
#else
#define OO_USE_FBO              0
#warning Building without frame buffer object support, are your OpenGL headers up to date?
#endif
 
 
/*  Multitexturing requires GL_ARB_multitexture, but we only have use for it
    if GL_ARB_texture_env_combine is available, and GL_ARB_texture_env_combine
    requires GL_ARB_multitexture. Both GL_ARB_multitexture and
    GL_ARB_texture_env_combine were promoted to core in OpenGL 1.3.
*/
#if GL_ARB_texture_env_combine
#define OO_MULTITEXTURE         1
#else
#warning Building without texture combiner support, are your OpenGL headers up to date?
#define OO_MULTITEXTURE         0
#endif
 
#if defined(GL_ARB_texture_cube_map) || defined(GL_VERSION_1_3)
#define OO_TEXTURE_CUBE_MAP     1
#else
#warning Building without cube map support, are your OpenGL headers up to date?
#define OO_TEXTURE_CUBE_MAP     0
#endif
 
 
 
#define OOOPENGLEXTMGR_LOCK_SET_ACCESS      (!OOLITE_MAC_OS_X)
 
 
@interface OOOpenGLExtensionManager: NSObject
{
@private
#if OOOPENGLEXTMGR_LOCK_SET_ACCESS
    NSLock                  *lock;
#endif
    NSSet                   *extensions;
    
    NSString                *vendor;
    NSString                *renderer;
    
    unsigned                major, minor, release;
    
    BOOL                    usePointSmoothing;
    BOOL                    useLineSmoothing;
    BOOL                    useDustShader;
    
#if OO_SHADERS
    BOOL                    shadersAvailable;
    OOShaderSetting         defaultShaderSetting;
    OOShaderSetting         maximumShaderSetting;
    GLint                   textureImageUnitCount;
#endif
#if OO_USE_VBO
    BOOL                    vboSupported;
#endif
#if OO_USE_FBO
    BOOL                    fboSupported;
#endif
#if OO_MULTITEXTURE
    BOOL                    textureCombinersSupported;
    GLint                   textureUnitCount;
#endif
}
 
+ (OOOpenGLExtensionManager *) sharedManager;
 
- (void) reset;
 
- (BOOL)haveExtension:(NSString *)extension;
 
- (BOOL)shadersSupported;
- (OOGraphicsDetail)defaultDetailLevel;
- (OOGraphicsDetail)maximumDetailLevel;
- (GLint)textureImageUnitCount;         // Fragment shader sampler count limit. Does not apply to fixed function multitexturing. (GL_MAX_TEXTURE_IMAGE_UNITS_ARB)
 
- (BOOL)vboSupported;                   // Vertex buffer objects
- (BOOL)fboSupported;                   // Frame buffer objects
- (BOOL)textureCombinersSupported;
- (GLint)textureUnitCount;              // Fixed function multitexture limit, does not apply to shaders. (GL_MAX_TEXTURE_UNITS_ARB)
 
- (NSUInteger)majorVersionNumber;
- (NSUInteger)minorVersionNumber;
- (NSUInteger)releaseVersionNumber;
- (void)getVersionMajor:(unsigned *)outMajor minor:(unsigned *)outMinor release:(unsigned *)outRelease;
- (BOOL) versionIsAtLeastMajor:(unsigned)maj minor:(unsigned)min;
 
- (NSString *) vendorString;
- (NSString *) rendererString;
 
//  GL_POINT_SMOOTH is slow or non-functional on some GPUs.
- (BOOL) usePointSmoothing;
- (BOOL) useLineSmoothing;
 
// Using vertex shader for dust transformation is counterproductive on systems which run vertex shaders on the CPU.
- (BOOL) useDustShader;
 
@end
 
 
OOINLINE BOOL OOShadersSupported(void) INLINE_PURE_FUNC;
OOINLINE BOOL OOShadersSupported(void)
{
    return [[OOOpenGLExtensionManager sharedManager] shadersSupported];
}
 
 
#if OOLITE_WINDOWS
/*  Declare the function pointers for the OpenGL extensions used in the game
    (required for Windows only).
*/
 
#if OO_SHADERS
// Shader functions
PFNGLUSEPROGRAMOBJECTARBPROC            glUseProgramObjectARB;
PFNGLGETUNIFORMLOCATIONARBPROC          glGetUniformLocationARB;
PFNGLUNIFORM1IARBPROC                   glUniform1iARB;
PFNGLUNIFORM1FARBPROC                   glUniform1fARB;
PFNGLUNIFORMMATRIX3FVARBPROC            glUniformMatrix3fvARB;
PFNGLUNIFORMMATRIX4FVARBPROC            glUniformMatrix4fvARB;
PFNGLUNIFORM4FVARBPROC                  glUniform4fvARB;
PFNGLGETOBJECTPARAMETERIVARBPROC        glGetObjectParameterivARB;
PFNGLCREATESHADEROBJECTARBPROC          glCreateShaderObjectARB;
PFNGLGETINFOLOGARBPROC                  glGetInfoLogARB;
PFNGLCREATEPROGRAMOBJECTARBPROC         glCreateProgramObjectARB;
PFNGLATTACHOBJECTARBPROC                glAttachObjectARB;
PFNGLDELETEOBJECTARBPROC                glDeleteObjectARB;
PFNGLLINKPROGRAMARBPROC                 glLinkProgramARB;
PFNGLCOMPILESHADERARBPROC               glCompileShaderARB;
PFNGLSHADERSOURCEARBPROC                glShaderSourceARB;
PFNGLUNIFORM2FVARBPROC                  glUniform2fvARB;
PFNGLBINDATTRIBLOCATIONARBPROC          glBindAttribLocationARB;
PFNGLENABLEVERTEXATTRIBARRAYARBPROC     glEnableVertexAttribArrayARB;
PFNGLVERTEXATTRIBPOINTERARBPROC         glVertexAttribPointerARB;
PFNGLDISABLEVERTEXATTRIBARRAYARBPROC    glDisableVertexAttribArrayARB;
PFNGLVALIDATEPROGRAMARBPROC             glValidateProgramARB;
#endif  // OO_SHADERS
 
 
#if OO_SHADERS || OO_MULTITEXTURE
PFNGLACTIVETEXTUREARBPROC               glActiveTextureARB;
#endif
 
#if OO_MULTITEXTURE
PFNGLCLIENTACTIVETEXTUREARBPROC         glClientActiveTextureARB;
#endif
 
#if OO_USE_VBO
PFNGLGENBUFFERSARBPROC                  glGenBuffersARB;
PFNGLDELETEBUFFERSARBPROC               glDeleteBuffersARB;
PFNGLBINDBUFFERARBPROC                  glBindBufferARB;
PFNGLBUFFERDATAARBPROC                  glBufferDataARB;
#endif
 
#if OO_USE_FBO
PFNGLGENFRAMEBUFFERSEXTPROC             glGenFramebuffersEXT;
PFNGLBINDFRAMEBUFFEREXTPROC             glBindFramebufferEXT;
PFNGLGENRENDERBUFFERSEXTPROC            glGenRenderbuffersEXT;
PFNGLBINDRENDERBUFFEREXTPROC            glBindRenderbufferEXT;
PFNGLRENDERBUFFERSTORAGEEXTPROC         glRenderbufferStorageEXT;
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC     glFramebufferRenderbufferEXT;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC        glFramebufferTexture2DEXT;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC      glCheckFramebufferStatusEXT;
PFNGLDELETEFRAMEBUFFERSEXTPROC          glDeleteFramebuffersEXT;
PFNGLDELETERENDERBUFFERSEXTPROC         glDeleteRenderbuffersEXT;
PFNGLGENRENDERBUFFERSPROC               glGenRenderbuffers;
PFNGLBINDRENDERBUFFERPROC               glBindRenderbuffer;
PFNGLRENDERBUFFERSTORAGEPROC            glRenderbufferStorage;
PFNGLGENFRAMEBUFFERSPROC                glGenFramebuffers;
PFNGLBINDFRAMEBUFFERPROC                glBindFramebuffer;
PFNGLFRAMEBUFFERRENDERBUFFERPROC        glFramebufferRenderbuffer;
PFNGLFRAMEBUFFERTEXTURE2DPROC           glFramebufferTexture2D;
PFNGLGENVERTEXARRAYSPROC                glGenVertexArrays;
PFNGLGENBUFFERSPROC                     glGenBuffers;
PFNGLBINDVERTEXARRAYPROC                glBindVertexArray;
PFNGLBINDBUFFERPROC                     glBindBuffer;
PFNGLBUFFERDATAPROC                     glBufferData;
PFNGLVERTEXATTRIBPOINTERPROC            glVertexAttribPointer;
PFNGLENABLEVERTEXATTRIBARRAYPROC        glEnableVertexAttribArray;
PFNGLUSEPROGRAMPROC                     glUseProgram;
PFNGLGETUNIFORMLOCATIONPROC             glGetUniformLocation;
PFNGLUNIFORM1IPROC                      glUniform1i;
PFNGLACTIVETEXTUREPROC                  glActiveTexture;
PFNGLBLENDFUNCSEPARATEPROC              glBlendFuncSeparate;
PFNGLUNIFORM1FPROC                      glUniform1f;
PFNGLUNIFORM2FVPROC                     glUniform2fv;
PFNGLDELETERENDERBUFFERSPROC            glDeleteRenderbuffers;
PFNGLDELETEFRAMEBUFFERSPROC             glDeleteFramebuffers;
PFNGLDELETEVERTEXARRAYSPROC             glDeleteVertexArrays;
PFNGLDELETEBUFFERSPROC                  glDeleteBuffers;
PFNGLDRAWBUFFERSPROC                    glDrawBuffers;
PFNGLCHECKFRAMEBUFFERSTATUSPROC         glCheckFramebufferStatus;
PFNGLTEXIMAGE2DMULTISAMPLEPROC              glTexImage2DMultisample;
PFNGLRENDERBUFFERSTORAGEMULTISAMPLEPROC     glRenderbufferStorageMultisample;
PFNGLBLITFRAMEBUFFERPROC                    glBlitFramebuffer;
PFNGLCLAMPCOLORPROC                     glClampColor;
#endif
 
#endif  // OOLITE_WINDOWS