Added some GL shader helper functions.

modules/juce_opengl/opengl/juce_OpenGLShaderProgram.cpp

@@ -51,10 +51,18 @@ double OpenGLShaderProgram::getLanguageVersion()
    #endif
 }
 
-bool OpenGLShaderProgram::addShader (const char* const code, GLenum type)
+bool OpenGLShaderProgram::addShader (StringRef code, GLenum type)
 {
     GLuint shaderID = context.extensions.glCreateShader (type);
-    context.extensions.glShaderSource (shaderID, 1, (const GLchar**) &code, nullptr);
+
+   #if JUCE_STRING_UTF_TYPE == 8
+    const GLchar* c = code.text;
+   #else
+    String codeString (code.text);
+    const GLchar* c = codeString.toRawUTF8();
+   #endif
+
+    context.extensions.glShaderSource (shaderID, 1, &c, nullptr);
     context.extensions.glCompileShader (shaderID);
 
     GLint status = GL_FALSE;
@@ -83,6 +91,9 @@ bool OpenGLShaderProgram::addShader (const char* const code, GLenum type)
     return true;
 }
 
+bool OpenGLShaderProgram::addVertexShader (StringRef code)    { return addShader (code, GL_VERTEX_SHADER); }
+bool OpenGLShaderProgram::addFragmentShader (StringRef code)  { return addShader (code, GL_FRAGMENT_SHADER); }
+
 bool OpenGLShaderProgram::link() noexcept
 {
     context.extensions.glLinkProgram (programID);

modules/juce_opengl/opengl/juce_OpenGLShaderProgram.h

@@ -59,7 +59,17 @@ public:
         @returns  true if the shader compiled successfully. If not, you can call
                   getLastError() to find out what happened.
     */
-    bool addShader (const char* const shaderSourceCode, GLenum shaderType);
+    bool addShader (StringRef shaderSourceCode, GLenum shaderType);
+
+    /** Compiles and adds a fragment shader to this program.
+        This is equivalent to calling addShader() with a type of GL_VERTEX_SHADER.
+    */
+    bool addVertexShader (StringRef shaderSourceCode);
+
+    /** Compiles and adds a fragment shader to this program.
+        This is equivalent to calling addShader() with a type of GL_FRAGMENT_SHADER.
+    */
+    bool addFragmentShader (StringRef shaderSourceCode);
 
     /** Links all the compiled shaders into a usable program.
         If your app is built in debug mode, this method will assert if the program