Declare OpenGL 2.0 dynamically-loaded functions for internal use

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1220 7f0cb862-5218-0410-a997-914c9d46530a

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 33b2b93..de00ec0 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,6 +43,8 @@ SET(FREEGLUT_SRCS
     src/fg_ext.c
     src/fg_font_data.c
     src/fg_gamemode.c
+    src/fg_gl2.c
+    src/fg_gl2.h
     src/fg_init.c
     src/fg_internal.h
     src/fg_input_devices.c

diff --git a/src/fg_gl2.c b/src/fg_gl2.c
new file mode 100644 (file)
index 0000000..47913f4
--- /dev/null
+++ b/src/fg_gl2.c
@@ -0,0 +1,58 @@
+/*
+ * fg_gl2.c
+ *
+ * Load OpenGL (ES) 2.0 functions used by fg_geometry
+ *
+ * Copyright (C) 2012  Sylvain Beucler
+ *
+ * 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
+ * PAWEL W. OLSZTA 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.
+ */
+
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+#include "fg_gl2.h"
+
+typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
+typedef void (APIENTRY *PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint* buffers);
+typedef void (APIENTRY *PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef void (APIENTRY *PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint);
+typedef void (APIENTRY *PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
+
+PFNGLGENBUFFERSPROC fghGenBuffers = NULL;
+PFNGLDELETEBUFFERSPROC fghDeleteBuffers = NULL;
+PFNGLBINDBUFFERPROC fghBindBuffer = NULL;
+PFNGLBUFFERDATAPROC fghBufferData = NULL;
+PFNGLENABLEVERTEXATTRIBARRAYPROC fghEnableVertexAttribArray = NULL;
+PFNGLDISABLEVERTEXATTRIBARRAYPROC fghDisableVertexAttribArray = NULL;
+PFNGLVERTEXATTRIBPOINTERPROC fghVertexAttribPointer = NULL;
+
+void fgInitGL2() {
+    fgState.HasOpenGL20 = 0;
+#define CHECK(func, a) if ((a) == NULL) { fgWarning("fgInitGL2: " func " is NULL"); return; }
+    CHECK("fghGenBuffers", fghGenBuffers = (PFNGLGENBUFFERSPROC) glutGetProcAddress ("glGenBuffers"));
+    CHECK("fghDeleteBuffers", fghDeleteBuffers = (PFNGLDELETEBUFFERSPROC) glutGetProcAddress ("glDeleteBuffers"));
+    CHECK("fghBindBuffer", fghBindBuffer = (PFNGLBINDBUFFERPROC) glutGetProcAddress ("glBindBuffer"));
+    CHECK("fghBufferData", fghBufferData = (PFNGLBUFFERDATAPROC) glutGetProcAddress ("glBufferData"));
+    CHECK("fghVertexAttribPointer", fghVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC) glutGetProcAddress ("glVertexAttribPointer"));
+    CHECK("fghEnableVertexAttribArray", fghEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glEnableVertexAttribArray"));
+    CHECK("fghDisableVertexAttribArray", fghDisableVertexAttribArray = (PFNGLDISABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glDisnableVertexAttribArray"));
+#undef CHECK
+    fgState.HasOpenGL20 = 1;
+}

diff --git a/src/fg_gl2.h b/src/fg_gl2.h
new file mode 100644 (file)
index 0000000..788db43
--- /dev/null
+++ b/src/fg_gl2.h
@@ -0,0 +1,49 @@
+/*
+ * fg_gl2.c
+ *
+ * Load OpenGL (ES) 2.0 functions used by fg_geometry
+ *
+ * Copyright (C) 2012  Sylvain Beucler
+ *
+ * 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
+ * PAWEL W. OLSZTA 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.
+ */
+
+#ifndef  FG_GL2_H
+#define  FG_GL2_H
+
+#ifndef APIENTRY
+#    define APIENTRY
+#endif
+typedef ptrdiff_t fghGLsizeiptr;
+typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
+typedef void (APIENTRY *PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint* buffers);
+typedef void (APIENTRY *PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef void (APIENTRY *PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint);
+typedef void (APIENTRY *PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
+
+PFNGLGENBUFFERSPROC fghGenBuffers;
+PFNGLDELETEBUFFERSPROC fghDeleteBuffers;
+PFNGLBINDBUFFERPROC fghBindBuffer;
+PFNGLBUFFERDATAPROC fghBufferData;
+PFNGLENABLEVERTEXATTRIBARRAYPROC fghEnableVertexAttribArray;
+PFNGLDISABLEVERTEXATTRIBARRAYPROC fghDisableVertexAttribArray;
+PFNGLVERTEXATTRIBPOINTERPROC fghVertexAttribPointer;
+
+#endif

diff --git a/src/fg_init.c b/src/fg_init.c
index d564e83..74c4649 100644 (file)
--- a/src/fg_init.c
+++ b/src/fg_init.c
@@ -90,6 +90,7 @@ SFG_State fgState = { { -1, -1, GL_FALSE },  /* Position */
                       0,                      /* OpenGL context MinorVersion */
                       0,                      /* OpenGL ContextFlags */
                       0,                      /* OpenGL ContextProfile */
+                      0,                      /* HasOpenGL20 */
                       NULL,                   /* ErrorFunc */
                       NULL                    /* WarningFunc */
 };
@@ -380,6 +381,8 @@ void FGAPIENTRY glutInit( int* pargc, char** argv )
         if( (mask & (XValue|YValue)) == (XValue|YValue) )
             fgState.Position.Use = GL_TRUE;
     }
+
+    fgInitGL2();
 }
 
 /*

diff --git a/src/fg_internal.h b/src/fg_internal.h
index 2119d1a..c7dd53b 100644 (file)
--- a/src/fg_internal.h
+++ b/src/fg_internal.h
@@ -319,6 +319,7 @@ struct tagSFG_State
     int              MajorVersion;         /* Major OpenGL context version  */
     int              MinorVersion;         /* Minor OpenGL context version  */
     int              ContextFlags;         /* OpenGL context flags          */
+    int              HasOpenGL20;          /* fgInitGL2 could find all OpenGL 2.0 functions */
     int              ContextProfile;       /* OpenGL context profile        */
     FGError          ErrorFunc;            /* User defined error handler    */
     FGWarning        WarningFunc;          /* User defined warning handler  */