Road to raylib 1.1 - Testing rlgl

src/rlgl.h

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+/*********************************************************************************************
+* 
+*   rlgl - raylib OpenGL abstraction layer
+*    
+*   raylib now uses OpenGL 1.1 style functions (rlVertex) that are mapped to selected OpenGL version:
+*       OpenGL 1.1  - Direct map rl* -> gl*
+*       OpenGL 3.3+ - Vertex data is stored in VAOs, call rlglDraw() to render
+*       OpenGL ES 2 - Same behaviour as OpenGL 3.3+ (NOT TESTED)
+* 
+*   Copyright (c) 2014 Ramon Santamaria (Ray San - raysan@raysanweb.com)
+*    
+*   This software is provided "as-is", without any express or implied warranty. In no event 
+*   will the authors be held liable for any damages arising from the use of this software.
+*
+*   Permission is granted to anyone to use this software for any purpose, including commercial 
+*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
+*
+*     1. The origin of this software must not be misrepresented; you must not claim that you 
+*     wrote the original software. If you use this software in a product, an acknowledgment 
+*     in the product documentation would be appreciated but is not required.
+*
+*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
+*     as being the original software.
+*
+*     3. This notice may not be removed or altered from any source distribution.
+*
+**********************************************************************************************/
+
+#ifndef RLGL_H
+#define RLGL_H
+
+// Select desired OpenGL version
+//#define USE_OPENGL_11
+#define USE_OPENGL_33
+//#define USE_OPENGL_ES2
+
+//----------------------------------------------------------------------------------
+// Defines and Macros
+//----------------------------------------------------------------------------------
+#define MAX_LINES_BATCH         1024
+#define MAX_TRIANGLES_BATCH     2048
+#define MAX_QUADS_BATCH         8192
+
+//----------------------------------------------------------------------------------
+// Types and Structures Definition
+//----------------------------------------------------------------------------------
+typedef unsigned char byte;
+
+typedef enum { RL_PROJECTION, RL_MODELVIEW, RL_TEXTURE } MatrixMode;
+
+typedef enum { RL_LINES, RL_TRIANGLES, RL_QUADS } DrawMode;
+
+#ifdef __cplusplus
+extern "C" {            // Prevents name mangling of functions
+#endif
+
+//------------------------------------------------------------------------------------
+// Functions Declaration - Matrix operations
+//------------------------------------------------------------------------------------
+void rlMatrixMode(int mode);                    // Choose the current matrix to be transformed
+void rlPushMatrix();                            // TODO: REVIEW: Required? - Push the current matrix to stack
+void rlPopMatrix();                             // TODO: REVIEW: Required? - Pop lattest inserted matrix from stack
+void rlLoadIdentity();                          // Reset current matrix to identity matrix
+void rlTranslatef(float x, float y, float z);   // Multiply the current matrix by a translation matrix
+void rlRotatef(float angleDeg, float x, float y, float z);  // Multiply the current matrix by a rotation matrix
+void rlScalef(float x, float y, float z);       // Multiply the current matrix by a scaling matrix
+void rlMultMatrixf(float *mat);                 // Multiply the current matrix by another matrix
+void rlFrustum(double left, double right, double bottom, double top, double near, double far);
+void rlOrtho(double left, double right, double bottom, double top, double near, double far);
+
+//------------------------------------------------------------------------------------
+// Functions Declaration - Vertex level operations
+//------------------------------------------------------------------------------------
+void rlBegin(int mode);                         // Initialize drawing mode (how to organize vertex)
+void rlEnd();                                   // Finish vertex providing
+void rlVertex2i(int x, int y);                  // Define one vertex (position) - 2 int
+void rlVertex2f(float x, float y);              // Define one vertex (position) - 2 float
+void rlVertex3f(float x, float y, float z);     // Define one vertex (position) - 3 float
+void rlTexCoord2f(float x, float y);            // Define one vertex (texture coordinate) - 2 float
+void rlNormal3f(float x, float y, float z);     // Define one vertex (normal) - 3 float
+void rlColor4ub(byte r, byte g, byte b, byte a);    // Define one vertex (color) - 4 byte
+void rlColor3f(float x, float y, float z);          // Define one vertex (color) - 3 float
+void rlColor4f(float x, float y, float z, float w); // Define one vertex (color) - 4 float
+
+//------------------------------------------------------------------------------------
+// Functions Declaration - OpenGL equivalent functions (common to 1.1, 3.3+, ES2)
+// NOTE: This functions are used to completely abstract raylib code from OpenGL layer
+//------------------------------------------------------------------------------------
+void rlEnableTexture(unsigned int id);      // Enable texture usage
+void rlDisableTexture();                    // Disable texture usage
+void rlDeleteTextures(unsigned int id);     // Delete OpenGL texture
+void rlClearColor(byte r, byte g, byte b, byte a);  // Clear color buffer with color
+void rlClearScreenBuffers();                // Clear used screen buffers (color and depth)
+
+//------------------------------------------------------------------------------------
+// Functions Declaration - rlgl functionality
+//------------------------------------------------------------------------------------
+#ifdef USE_OPENGL_33
+void rlglInit();                            // Initialize rlgl (shaders, VAO, VBO...)
+void rlglClose();                           // De-init rlgl
+void rlglDraw();                            // Draw VAOs
+#endif
+
+void rlglInitGraphicsDevice(int fbWidth, int fbHeight);  // Initialize Graphics Device (OpenGL stuff)
+unsigned int rlglTexture(int width, int height, unsigned char *pixels); // Create OpenGL texture
+byte *rlglReadScreenPixels(int width, int height);    // Read screen pixel data (color buffer)
+
+#ifdef USE_OPENGL_33
+void PrintProjectionMatrix();       // DEBUG: Print projection matrix
+void PrintModelviewMatrix();        // DEBUG: Print modelview matrix
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // RLGL_H