Addressed issue #1051

Allow frustrum culling near/far distance configuration at compile time.

src/core.c

@@ -1331,7 +1331,7 @@ void BeginMode3D(Camera3D camera)
         double top = 0.01*tan(camera.fovy*0.5*DEG2RAD);
         double right = top*aspect;
 
-        rlFrustum(-right, right, -top, top, 0.01, 1000.0);
+        rlFrustum(-right, right, -top, top, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     }
     else if (camera.type == CAMERA_ORTHOGRAPHIC)
     {
@@ -1339,7 +1339,7 @@ void BeginMode3D(Camera3D camera)
         double top = camera.fovy/2.0;
         double right = top*aspect;
 
-        rlOrtho(-right,right,-top,top, 0.01, 1000.0);
+        rlOrtho(-right, right, -top,top, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     }
 
     // NOTE: zNear and zFar values are important when computing depth buffer values
@@ -1452,7 +1452,7 @@ Ray GetMouseRay(Vector2 mousePosition, Camera camera)
     if (camera.type == CAMERA_PERSPECTIVE)
     {
         // Calculate projection matrix from perspective
-        matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)GetScreenWidth()/(double)GetScreenHeight()), 0.01, 1000.0);
+        matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)GetScreenWidth()/(double)GetScreenHeight()), DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     }
     else if (camera.type == CAMERA_ORTHOGRAPHIC)
     {
@@ -1528,7 +1528,7 @@ Vector2 GetWorldToScreen(Vector3 position, Camera camera)
     if (camera.type == CAMERA_PERSPECTIVE)
     {
         // Calculate projection matrix from perspective
-        matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)GetScreenWidth()/(double)GetScreenHeight()), 0.01, 1000.0);
+        matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)GetScreenWidth()/(double)GetScreenHeight()), DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     }
     else if (camera.type == CAMERA_ORTHOGRAPHIC)
     {

src/rlgl.h

@@ -136,6 +136,13 @@
 #define MAX_MATRIX_STACK_SIZE               32      // Max size of Matrix stack
 #define MAX_DRAWCALL_REGISTERED            256      // Max draws by state changes (mode, texture)
 
+#ifndef DEFAULT_NEAR_CULL_DISTANCE
+    #define DEFAULT_NEAR_CULL_DISTANCE    0.01      // Default near cull distance
+#endif
+#ifndef DEFAULT_FAR_CULL_DISTANCE
+    #define DEFAULT_FAR_CULL_DISTANCE   1000.0      // Default far cull distance
+#endif
+
 // Shader and material limits
 #define MAX_SHADER_LOCATIONS                32      // Maximum number of predefined locations stored in shader struct
 #define MAX_MATERIAL_MAPS                   12      // Maximum number of texture maps stored in shader struct
@@ -3255,7 +3262,7 @@ Texture2D GenTextureCubemap(Shader shader, Texture2D map, int size)
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
     // Create projection and different views for each face
-    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, 0.01, 1000.0);
+    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     Matrix fboViews[6] = {
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
@@ -3333,7 +3340,7 @@ Texture2D GenTextureIrradiance(Shader shader, Texture2D cubemap, int size)
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
     // Create projection (transposed) and different views for each face
-    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, 0.01, 1000.0);
+    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     Matrix fboViews[6] = {
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
@@ -3414,7 +3421,7 @@ Texture2D GenTexturePrefilter(Shader shader, Texture2D cubemap, int size)
     glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
 
     // Create projection (transposed) and different views for each face
-    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, 0.01, 1000.0);
+    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     Matrix fboViews[6] = {
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
         MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
@@ -3632,7 +3639,7 @@ void SetVrConfiguration(VrDeviceInfo hmd, Shader distortion)
 
     // Compute camera projection matrices
     float projOffset = 4.0f*lensShift;      // Scaled to projection space coordinates [-1..1]
-    Matrix proj = MatrixPerspective(fovy, aspect, 0.01, 1000.0);
+    Matrix proj = MatrixPerspective(fovy, aspect, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
     vrConfig.eyesProjection[0] = MatrixMultiply(proj, MatrixTranslate(projOffset, 0.0f, 0.0f));
     vrConfig.eyesProjection[1] = MatrixMultiply(proj, MatrixTranslate(-projOffset, 0.0f, 0.0f));