added GetMatrixProjection fixed issue with GL11 where model matrix was identity (raysan5#999)

Author: chriscamacho

src/raylib.h

@@ -432,7 +432,7 @@ typedef struct Sound {
 typedef struct Music {
     int ctxType;                    // Type of music context (audio filetype)
     void *ctxData;                  // Audio context data, depends on type
-    
+
     unsigned int sampleCount;       // Total number of samples
     unsigned int loopCount;         // Loops count (times music will play), 0 means infinite loop
 
@@ -1319,6 +1319,7 @@ RLAPI void SetShaderValueTexture(Shader shader, int uniformLoc, Texture2D textur
 RLAPI void SetMatrixProjection(Matrix proj);                              // Set a custom projection matrix (replaces internal projection matrix)
 RLAPI void SetMatrixModelview(Matrix view);                               // Set a custom modelview matrix (replaces internal modelview matrix)
 RLAPI Matrix GetMatrixModelview(void);                                    // Get internal modelview matrix
+RLAPI Matrix GetMatrixProjection(void);                                   // Get internal projection matrix
 
 // Texture maps generation (PBR)
 // NOTE: Required shaders should be provided

src/rlgl.h

@@ -3155,6 +3155,23 @@ void SetMatrixProjection(Matrix proj)
 #endif
 }
 
+// Return internal projection matrix
+Matrix GetMatrixProjection(void) {
+#if defined(GRAPHICS_API_OPENGL_11)
+    float mat[16];
+    glGetFloatv(GL_PROJECTION_MATRIX,mat);
+    Matrix m;
+    m.m0  = mat[0];     m.m1  = mat[1];     m.m2  = mat[2];     m.m3  = mat[3];
+    m.m4  = mat[4];     m.m5  = mat[5];     m.m6  = mat[6];     m.m7  = mat[7];
+    m.m8  = mat[8];     m.m9  = mat[9];     m.m10 = mat[10];    m.m11 = mat[11];
+    m.m12 = mat[12];    m.m13 = mat[13];    m.m14 = mat[14];    m.m15 = mat[15];
+    return m;
+#else
+    return projection;
+#endif
+#
+}
+
 // Set a custom modelview matrix (replaces internal modelview matrix)
 void SetMatrixModelview(Matrix view)
 {
@@ -3170,6 +3187,10 @@ Matrix GetMatrixModelview(void)
 #if defined(GRAPHICS_API_OPENGL_11)
     float mat[16];
     glGetFloatv(GL_MODELVIEW_MATRIX, mat);
+    matrix.m0  = mat[0];     matrix.m1  = mat[1];     matrix.m2  = mat[2];     matrix.m3  = mat[3];
+    matrix.m4  = mat[4];     matrix.m5  = mat[5];     matrix.m6  = mat[6];     matrix.m7  = mat[7];
+    matrix.m8  = mat[8];     matrix.m9  = mat[9];     matrix.m10 = mat[10];    matrix.m11 = mat[11];
+    matrix.m12 = mat[12];    matrix.m13 = mat[13];    matrix.m14 = mat[14];    matrix.m15 = mat[15];
 #else
     matrix = modelview;
 #endif