add updateCamerTransforms helper function

src/shader.cpp

@@ -196,6 +196,13 @@ getGLTexture(GLContext* gl_ctx, Texture* diffuse_img)
 	return nullptr;
 }
 
+void
+updateCameraTransforms(Transforms* xforms, GLBuffer* xform_ubo)
+{
+	glBindBuffer(xform_ubo->target, xform_ubo->id);
+	glBufferSubData(xform_ubo->target, 0, sizeof(*xforms), xforms);
+}
+
 void
 renderVAO(GLMesh* glmesh,
 	glm::mat4* node_xform,

src/shader.h

@@ -190,6 +190,8 @@ GLBuffer* getFreeUBO(GLContext* gl_ctx);
 
 GLTexture* getGLTexture(GLContext* gl_ctx, Texture* diffuse_img);
 
+void updateCameraTransforms(Transforms* xforms, GLBuffer* xform_ubo);
+
 void renderVAO(GLMesh* glmesh,
 	glm::mat4* node_xform,
 	ShaderProgram* shader,