Move all GLES samples into the samples directory.

There was no real reason to keep them in an angle directory and it makes
the generated projects nicer.

BUG=angleproject:981

Change-Id: I844e44dc5c2df51f5292cff4bdffe5e951745aae
Reviewed-on: https://chromium-review.googlesource.com/266871
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>

samples/post_sub_buffer/PostSubBuffer.cpp

@@ -0,0 +1,176 @@
+//
+// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+//            Based on Simple_VertexShader.c from
+// Book:      OpenGL(R) ES 2.0 Programming Guide
+// Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
+// ISBN-10:   0321502795
+// ISBN-13:   9780321502797
+// Publisher: Addison-Wesley Professional
+// URLs:      http://safari.informit.com/9780321563835
+//            http://www.opengles-book.com
+
+#include "SampleApplication.h"
+#include "shader_utils.h"
+#include "texture_utils.h"
+#include "geometry_utils.h"
+#include "Vector.h"
+#include "Matrix.h"
+#include <iostream>
+
+class PostSubBufferSample : public SampleApplication
+{
+  public:
+    PostSubBufferSample::PostSubBufferSample()
+        : SampleApplication("PostSubBuffer", 1280, 720)
+    {
+    }
+
+    virtual bool initialize()
+    {
+        mPostSubBufferNV = (PFNEGLPOSTSUBBUFFERNVPROC)eglGetProcAddress("eglPostSubBufferNV");
+        if (!mPostSubBufferNV)
+        {
+            std::cerr << "Could not load eglPostSubBufferNV.";
+            return false;
+        }
+
+        const std::string vs = SHADER_SOURCE
+        (
+            uniform mat4 u_mvpMatrix;
+            attribute vec4 a_position;
+            attribute vec2 a_texcoord;
+            varying vec2 v_texcoord;
+            void main()
+            {
+                gl_Position = u_mvpMatrix * a_position;
+                v_texcoord = a_texcoord;
+            }
+        );
+
+        const std::string fs = SHADER_SOURCE
+        (
+            precision mediump float;
+            varying vec2 v_texcoord;
+            void main()
+            {
+                gl_FragColor = vec4(v_texcoord.x, v_texcoord.y, 1.0, 1.0);
+            }
+        );
+
+        mProgram = CompileProgram(vs, fs);
+        if (!mProgram)
+        {
+            return false;
+        }
+
+        // Get the attribute locations
+        mPositionLoc = glGetAttribLocation(mProgram, "a_position");
+        mTexcoordLoc = glGetAttribLocation(mProgram, "a_texcoord");
+
+        // Get the uniform locations
+        mMVPMatrixLoc = glGetUniformLocation(mProgram, "u_mvpMatrix");
+
+        // Generate the geometry data
+        GenerateCubeGeometry(0.5f, &mCube);
+
+        // Set an initial rotation
+        mRotation = 45.0f;
+
+        // Clear the whole window surface to blue.
+        glClearColor(0.0f, 0.0f, 1.0f, 0.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        SampleApplication::swap();
+
+        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+        glCullFace(GL_BACK);
+        glEnable(GL_CULL_FACE);
+
+        return true;
+    }
+
+    virtual void destroy()
+    {
+        glDeleteProgram(mProgram);
+    }
+
+    virtual void step(float dt, double totalTime)
+    {
+        mRotation = fmod(mRotation + (dt * 40.0f), 360.0f);
+
+        Matrix4 perspectiveMatrix = Matrix4::perspective(60.0f, float(getWindow()->getWidth()) / getWindow()->getHeight(),
+                                                         1.0f, 20.0f);
+
+        Matrix4 modelMatrix = Matrix4::translate(Vector3(0.0f, 0.0f, -2.0f)) *
+                              Matrix4::rotate(mRotation, Vector3(1.0f, 0.0f, 1.0f));
+
+        Matrix4 viewMatrix = Matrix4::identity();
+
+        Matrix4 mvpMatrix = perspectiveMatrix * viewMatrix * modelMatrix;
+
+        // Load the matrices
+        glUniformMatrix4fv(mMVPMatrixLoc, 1, GL_FALSE, mvpMatrix.data);
+    }
+
+    virtual void draw()
+    {
+        // Set the viewport
+        glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
+
+        // Clear the color buffer
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        // Use the program object
+        glUseProgram(mProgram);
+
+        // Load the vertex position
+        glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, GL_FALSE, 0, mCube.positions.data());
+        glEnableVertexAttribArray(mPositionLoc);
+
+        // Load the texcoord data
+        glVertexAttribPointer(mTexcoordLoc, 2, GL_FLOAT, GL_FALSE, 0, mCube.texcoords.data());
+        glEnableVertexAttribArray(mTexcoordLoc);
+
+        // Draw the cube
+        glDrawElements(GL_TRIANGLES, mCube.indices.size(), GL_UNSIGNED_SHORT, mCube.indices.data());
+    }
+
+    virtual void swap()
+    {
+        // Instead of letting the application call eglSwapBuffers, call eglPostSubBufferNV here instead
+        size_t windowWidth = getWindow()->getWidth();
+        size_t windowHeight = getWindow()->getHeight();
+        EGLDisplay display = getDisplay();
+        EGLSurface surface = getSurface();
+        mPostSubBufferNV(display, surface, 60, 60, windowWidth - 120, windowHeight - 120);
+    }
+
+  private:
+    // Handle to a program object
+    GLuint mProgram;
+
+    // Attribute locations
+    GLint mPositionLoc;
+    GLint mTexcoordLoc;
+
+    // Uniform locations
+    GLuint mMVPMatrixLoc;
+
+    // Current rotation
+    float mRotation;
+
+    // Geometry data
+    CubeGeometry mCube;
+
+    // eglPostSubBufferNV entry point
+    PFNEGLPOSTSUBBUFFERNVPROC mPostSubBufferNV;
+};
+
+int main(int argc, char **argv)
+{
+    PostSubBufferSample app;
+    return app.run();
+}