added possibility to get modelview matrix from rlgl to be able to send it to shaders

src/rlgl.c

@@ -2539,6 +2539,12 @@ void SetMatrixModelview(Matrix view)
 #endif
 }
 
+Matrix GetMatrixModelview() {
+#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
+    return modelview;
+#endif
+}
+
 // Generate cubemap texture from HDR texture
 // TODO: OpenGL ES 2.0 does not support GL_RGB16F texture format, neither GL_DEPTH_COMPONENT24
 Texture2D GenTextureCubemap(Shader shader, Texture2D skyHDR, int size)

src/rlgl.h

@@ -461,6 +461,8 @@ void SetShaderValuei(Shader shader, int uniformLoc, const int *value, int size);
 void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat);       // Set shader uniform value (matrix 4x4)
 void SetMatrixProjection(Matrix proj);                              // Set a custom projection matrix (replaces internal projection matrix)
 void SetMatrixModelview(Matrix view);                               // Set a custom modelview matrix (replaces internal modelview matrix)
+Matrix GetMatrixModelview();
+
 
 // Texture maps generation (PBR)
 // NOTE: Required shaders should be provided