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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_PROGRAM_H
+#define ANDROID_UI_PROGRAM_H
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include <utils/KeyedVector.h>
+
+#include "Matrix.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * A program holds a vertex and a fragment shader. It offers several utility
+ * methods to query attributes and uniforms.
+ */
+class Program {
+public:
+ /**
+ * Creates a new program with the specified vertex and fragment
+ * shaders sources.
+ */
+ Program(const char* vertex, const char* fragment);
+ virtual ~Program();
+
+ /**
+ * Binds this program to the GL context.
+ */
+ virtual void use();
+
+ /**
+ * Marks this program as unused. This will not unbind
+ * the program from the GL context.
+ */
+ virtual void remove();
+
+ /**
+ * Returns the OpenGL name of the specified attribute.
+ */
+ int getAttrib(const char* name);
+
+ /**
+ * Returns the OpenGL name of the specified uniform.
+ */
+ int getUniform(const char* name);
+
+ /**
+ * Indicates whether this program is currently in use with
+ * the GL context.
+ */
+ inline bool isInUse() const {
+ return mUse;
+ }
+
+ /**
+ * Binds the program with the specified projection, modelView and
+ * transform matrices.
+ */
+ void set(const mat4& projectionMatrix, const mat4& modelViewMatrix,
+ const mat4& transformMatrix);
+
+ /**
+ * Sets the color associated with this shader.
+ */
+ void setColor(const float r, const float g, const float b, const float a);
+
+ /**
+ * Name of the position attribute.
+ */
+ int position;
+
+ /**
+ * Name of the transform uniform.
+ */
+ int transform;
+
+protected:
+ /**
+ * Adds an attribute with the specified name.
+ *
+ * @return The OpenGL name of the attribute.
+ */
+ int addAttrib(const char* name);
+
+ /**
+ * Adds a uniform with the specified name.
+ *
+ * @return The OpenGL name of the uniform.
+ */
+ int addUniform(const char* name);
+
+private:
+ /**
+ * Compiles the specified shader of the specified type.
+ *
+ * @return The name of the compiled shader.
+ */
+ GLuint buildShader(const char* source, GLenum type);
+
+ // Name of the OpenGL program
+ GLuint id;
+
+ // Name of the shaders
+ GLuint vertexShader;
+ GLuint fragmentShader;
+
+ // Keeps track of attributes and uniforms slots
+ KeyedVector<const char*, int> attributes;
+ KeyedVector<const char*, int> uniforms;
+
+ bool mUse;
+}; // class Program
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_PROGRAM_H