first commit

2022-10-20 20:29:11 +08:00
commit 4d531f8044
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+//
+//  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.
+//
+
+#pragma once
+
+#include <boost/utility.hpp>
+#include <stack>
+
+#if defined (SG_MAC)
+#include <OpenGL/gl.h>
+#elif defined (_GLES2)
+#include <GLES2/gl2.h>
+#else
+#include <GL/glew.h> // Must be included before <GL/gl.h>
+#include <GL/gl.h>
+#endif
+
+
+class GL_utils : private boost::noncopyable {
+public:
+  static GL_utils& instance ();
+
+  enum GLenum_Mode {
+    GL_UTILS_MODELVIEW,
+    GL_UTILS_PROJECTION,
+    GL_UTILS_TEXTURE,
+    GL_UTILS_COLOR,
+    GL_UTILS_LAST,
+    GL_UTILS_UNSET
+  };
+
+  GLuint load_program (const char *vert_shader_src, const char *frag_shader_src);
+
+  void glMatrixMode (const GL_utils::GLenum_Mode mode);
+  void glLoadIdentity ();
+  void gluOrtho2D (const GLfloat left,
+                   const GLfloat right,
+                   const GLfloat bottom,
+                   const GLfloat top);
+  void glOrtho (const GLfloat left,
+                const GLfloat right,
+                const GLfloat bottom,
+                const GLfloat top,
+                const GLfloat nearVal,
+                const GLfloat farVal);
+  void glTranslatef (const GLfloat x, const GLfloat y, const GLfloat z);
+  void glRotatef (const GLfloat angle, const GLfloat x, const GLfloat y, const GLfloat z);
+  void glScalef (const GLfloat x, const GLfloat y, const GLfloat z);
+  // C' = C X M
+  void glMultMatrixf (const GLfloat m[4][4]);
+  void glPushMatrix ();
+  void glPopMatrix ();
+  GLfloat* get_top_matrix (const GL_utils::GLenum_Mode mode);
+  void Debug (const GL_utils::GLenum_Mode mode) const;
+
+private:
+  explicit GL_utils ();
+  virtual ~GL_utils ();
+
+  GLuint load_shader (GLenum type, const char *shader_src);
+
+  typedef struct {
+    GLfloat m[4][4];
+  } Matrix;
+
+  std::stack <Matrix> m_Matrix[GL_UTILS_LAST];
+  GLenum_Mode m_Current_Matrix_Mode;
+};