--- /dev/null
+/******************************************************************************
+ * Arachnoid Graphics Plugin for Mupen64Plus
+ * http://bitbucket.org/wahrhaft/mupen64plus-video-arachnoid/
+ *
+ * Copyright (C) 2009 Jon Ring
+ * Copyright (C) 2007 Kristofer Karlsson, Rickard Niklasson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include "FogManager.h"
+#include "ExtensionChecker.h"
+#include "m64p.h"
+#include "OpenGL.h"
+
+#ifndef GL_GLEXT_VERSION
+ //-----------------------------------------------------------------------------
+ // EXT_fog_coord functions
+ //-----------------------------------------------------------------------------
+ #ifndef GL_EXT_fog_coord
+ #define GL_EXT_fog_coord 1
+ #if defined(GL_GLEXT_PROTOTYPES) && !defined(HAVE_GLES)
+ extern void APIENTRY glFogCoordfEXT (GLfloat);
+ extern void APIENTRY glFogCoordfvEXT (const GLfloat *);
+ extern void APIENTRY glFogCoorddEXT (GLdouble);
+ extern void APIENTRY glFogCoorddvEXT (const GLdouble *);
+ extern void APIENTRY glFogCoordPointerEXT (GLenum, GLsizei, const GLvoid *);
+ #endif
+
+ typedef void (APIENTRY * PFNGLFOGCOORDFEXTPROC) (GLfloat coord);
+ typedef void (APIENTRY * PFNGLFOGCOORDFVEXTPROC) (const GLfloat *coord);
+ typedef void (APIENTRY * PFNGLFOGCOORDDEXTPROC) (GLdouble coord);
+ typedef void (APIENTRY * PFNGLFOGCOORDDVEXTPROC) (const GLdouble *coord);
+ typedef void (APIENTRY * PFNGLFOGCOORDPOINTEREXTPROC) (GLenum type, GLsizei stride, const GLvoid *pointer);
+
+ #define GL_FOG_COORDINATE_SOURCE_EXT 0x8450
+ #define GL_FOG_COORDINATE_EXT 0x8451
+ #define GL_FOG_COORDINATE_ARRAY_EXT 0x8457
+ #endif
+
+ PFNGLFOGCOORDFEXTPROC glFogCoordfEXT;
+ PFNGLFOGCOORDFVEXTPROC glFogCoordfvEXT;
+ PFNGLFOGCOORDDEXTPROC glFogCoorddEXT;
+ PFNGLFOGCOORDDVEXTPROC glFogCoorddvEXT;
+ PFNGLFOGCOORDPOINTEREXTPROC glFogCoordPointerEXT;
+#endif
+
+#ifdef HAVE_GLES
+#define glFogi glFogf
+#endif
+
+//-----------------------------------------------------------------------------
+//! Static Variables
+//-----------------------------------------------------------------------------
+bool FogManager::m_fogExtensionsSupported = false;
+
+//-----------------------------------------------------------------------------
+//! Constructor
+//-----------------------------------------------------------------------------
+FogManager::FogManager()
+{
+ m_multiplier = 0;
+ m_offset = 0;
+}
+
+//-----------------------------------------------------------------------------
+//! Destructor
+//-----------------------------------------------------------------------------
+FogManager::~FogManager()
+{
+ dispose();
+}
+
+//-----------------------------------------------------------------------------
+//* Initialize
+//! Initializes fog extensions
+//-----------------------------------------------------------------------------
+void FogManager::initialize()
+{
+ m_multiplier = 0;
+ m_offset = 0;
+
+ //Initialize extensions
+ static bool fogExtensionInitialized = false;
+ if ( !fogExtensionInitialized )
+ {
+#ifndef HAVE_GLES
+ m_fogExtensionsSupported = isExtensionSupported("GL_EXT_fog_coord");
+ if ( m_fogExtensionsSupported )
+ {
+#ifndef GL_GLEXT_VERSION
+ glFogCoordfEXT = (PFNGLFOGCOORDFEXTPROC)wglGetProcAddress( "glFogCoordfEXT" );
+ glFogCoordfvEXT = (PFNGLFOGCOORDFVEXTPROC)wglGetProcAddress( "glFogCoordfvEXT" );
+ glFogCoorddEXT = (PFNGLFOGCOORDDEXTPROC)wglGetProcAddress( "glFogCoorddEXT" );
+ glFogCoorddvEXT = (PFNGLFOGCOORDDVEXTPROC)wglGetProcAddress( "glFogCoorddvEXT" );
+ glFogCoordPointerEXT = (PFNGLFOGCOORDPOINTEREXTPROC)wglGetProcAddress( "glFogCoordPointerEXT" );
+#endif
+ fogExtensionInitialized = true;
+ }
+#endif
+ }
+
+#ifndef HAVE_GLES
+ glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
+#endif
+}
+
+//-----------------------------------------------------------------------------
+//! Dispose
+//-----------------------------------------------------------------------------
+void FogManager::dispose()
+{
+}
+
+//-----------------------------------------------------------------------------
+//* SetFogCoordPointer
+//! Function used to set vertex based fog
+//! @param[in] type Specifies the datatype of each fog coordinate in the array.
+//! @param[in] stride Specifies the byte offset between consecutive fog coordinates
+//! @param[in] pointer Specifies a pointer to the first component of the first fog coordinate in the array
+//! http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.opengl/doc/openglrf/glFogCoordPointerEXT.htm
+//-----------------------------------------------------------------------------
+void FogManager::setFogCoordPointer(unsigned int type, int stride, const void* pointer)
+{
+ if ( m_fogExtensionsSupported )
+ {
+ glFogCoordPointerEXT(type, stride, pointer);
+ }
+}
+
+//-----------------------------------------------------------------------------
+//* Enable Fog Coord Array
+//! Function used to enable vertex based fog
+//! @see disableFogCoordArray()
+//-----------------------------------------------------------------------------
+void FogManager::enableFogCoordArray()
+{
+ if ( m_fogExtensionsSupported )
+ {
+ glEnableClientState(GL_FOG_COORDINATE_ARRAY_EXT);
+ }
+}
+
+//-----------------------------------------------------------------------------
+//* Disable Fog Coord Array
+//! Function used to disable vertex based fog
+//! @see enableFogCoordArray()
+//-----------------------------------------------------------------------------
+void FogManager::disableFogCoordArray()
+{
+ if ( m_fogExtensionsSupported )
+ {
+ glDisableClientState(GL_FOG_COORDINATE_ARRAY_EXT);
+ }
+}
+
+//-----------------------------------------------------------------------------
+//* Set Linear Fog
+//! Function used to set linear fog using a linear fog equation
+//! Equation for linear fog is:
+//! <KBD> fog = (end - z) / (end - start) </KBD>
+//! where z is the distance in eye coordinates from the origin to the fragment being fogged
+//! @param start Specifies start (near) distance used in the linear fog equation.
+//! The initial near distance is 0.
+//! @param end Specifies end (the far) distance used in the linear fog equation.
+//! The initial far distance is 1.
+//! http://www.hmug.org/man/3/glFogi.php
+//-----------------------------------------------------------------------------
+void FogManager::setLinearFog(float start, float end)
+{
+ glFogi(GL_FOG_MODE, GL_LINEAR);
+ glFogf(GL_FOG_START, start);
+ glFogf(GL_FOG_END, end);
+}
+
+//-----------------------------------------------------------------------------
+//* Set Fog Color
+//! @param r The red component of the fog color
+//! @param g The green component of the fog color
+//! @param b The blue component of the fog color
+//! @param a The alpha component of the fog color
+//-----------------------------------------------------------------------------
+void FogManager::setFogColor(float r, float g, float b, float a)
+{
+ float fogColor[4] = { r,g,b,a };
+ glFogfv(GL_FOG_COLOR, fogColor );
+}
notaz.gp2x.de / mupen64plus-pandora.git / blobdiff