Added functions to customize internal matrix

Internal modelview and projection matrices can be replaced before
drawing.

src/raylib.h

@@ -868,6 +868,9 @@ void SetShaderValue(Shader shader, int uniformLoc, float *value, int size); // S
 void SetShaderValuei(Shader shader, int uniformLoc, int *value, int size);  // Set shader uniform value (int)
 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)
+
 void BeginShaderMode(Shader shader);                                // Begin custom shader drawing
 void EndShaderMode(void);                                           // End custom shader drawing (use default shader)
 void BeginBlendMode(int mode);                                      // Begin blending mode (alpha, additive, multiplied)

src/raymath.h

@@ -339,15 +339,14 @@ RMDEF Vector3 VectorReflect(Vector3 vector, Vector3 normal)
     return result;
 }
 
-// Transforms a Vector3 with a given Matrix
+// Transforms a Vector3 by a given Matrix
+// TODO: Review math (matrix transpose required?)
 RMDEF void VectorTransform(Vector3 *v, Matrix mat)
 {
     float x = v->x;
     float y = v->y;
     float z = v->z;
 
-    //MatrixTranspose(&mat);
-
     v->x = mat.m0*x + mat.m4*y + mat.m8*z + mat.m12;
     v->y = mat.m1*x + mat.m5*y + mat.m9*z + mat.m13;
     v->z = mat.m2*x + mat.m6*y + mat.m10*z + mat.m14;

src/rlgl.c

@@ -28,7 +28,7 @@
 
 #include "rlgl.h"
 
-#include <stdio.h>                  // Standard input / output lib
+#include <stdio.h>                  // Required for: fopen(), fclose(), fread()... [Used only on ReadTextFile()]
 #include <stdlib.h>                 // Required for: malloc(), free(), rand()
 #include <string.h>                 // Required for: strcmp(), strlen(), strtok()
 
@@ -59,8 +59,8 @@
 #endif
 
 #if defined(RLGL_STANDALONE)
-    #include <stdarg.h>             // Required for: va_list, va_start(), vfprintf(), va_end()
-#endif                              // NOTE: Used on TraceLog()
+    #include <stdarg.h>             // Required for: va_list, va_start(), vfprintf(), va_end() [Used only on TraceLog()]
+#endif
 
 //----------------------------------------------------------------------------------
 // Defines and Macros
@@ -355,7 +355,6 @@ void rlRotatef(float angleDeg, float x, float y, float z)
     Vector3 axis = (Vector3){ x, y, z };
     VectorNormalize(&axis);
     matRotation = MatrixRotate(axis, angleDeg*DEG2RAD);
-
     MatrixTranspose(&matRotation);
 
     *currentMatrix = MatrixMultiply(*currentMatrix, matRotation);
@@ -2153,7 +2152,7 @@ void UnloadShader(Shader shader)
     }
 }
 
-// Set custom shader to be used on batch draw
+// Begin custom shader mode
 void BeginShaderMode(Shader shader)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -2165,7 +2164,7 @@ void BeginShaderMode(Shader shader)
 #endif
 }
 
-// Set default shader to be used in batch draw
+// End custom shader mode (returns to default shader)
 void EndShaderMode(void)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -2251,6 +2250,18 @@ void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat)
 #endif
 }
 
+// Set a custom projection matrix (replaces internal projection matrix)
+void SetMatrixProjection(Matrix proj)
+{
+    projection = proj;
+}
+
+// Set a custom modelview matrix (replaces internal modelview matrix)
+void SetMatrixModelview(Matrix view)
+{
+    modelview = view;
+}
+
 // Begin blending mode (alpha, additive, multiplied)
 // NOTE: Only 3 blending modes supported, default blend mode is alpha
 void BeginBlendMode(int mode)
@@ -3068,7 +3079,7 @@ static void UnloadDefaultBuffers(void)
     free(quads.indices);
 }
 
-// Sets shader uniform values for lights array
+// Setup shader uniform values for lights array
 // NOTE: It would be far easier with shader UBOs but are not supported on OpenGL ES 2.0f
 static void SetShaderLights(Shader shader)
 {

src/rlgl.h

@@ -329,6 +329,9 @@ void SetShaderValue(Shader shader, int uniformLoc, float *value, int size); // S
 void SetShaderValuei(Shader shader, int uniformLoc, int *value, int size);  // Set shader uniform value (int)
 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)
+
 void BeginShaderMode(Shader shader);                                // Begin custom shader drawing
 void EndShaderMode(void);                                           // End custom shader drawing (use default shader)
 void BeginBlendMode(int mode);                                      // Begin blending mode (alpha, additive, multiplied)