Added stencil-test demo.

PS: I have not moved the repeated code to the base class for this demo because this is the last one I intend to submit before starting to port the demos to pepper. I will refactor all the demos to eliminate repeating code in light of pepper framework.
BUG=26099
TEST=Run stencil_test executable. You should see four different-colored quads.
Review URL: http://codereview.chromium.org/545092

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36410 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 137 insertions, 47 deletions

diff --git a/gpu/demos/demos.gyp b/gpu/demos/demos.gyp
index 5aeaade..99aa697 100644
--- a/gpu/demos/demos.gyp
+++ b/gpu/demos/demos.gyp
@@ -79,6 +79,17 @@
       ],
     },
     {
+      'target_name': 'stencil_test',
+      'type': 'executable',
+      'dependencies': [
+        'app_framework',
+        '../../third_party/gles2_book/gles2_book.gyp:stencil_test',
+      ],
+      'sources': [
+        'stencil_test/main.cc',
+      ],
+    },
+    {
       'target_name': 'texture_wrap',
       'type': 'executable',
       'dependencies': [
diff --git a/gpu/demos/stencil_test/main.cc b/gpu/demos/stencil_test/main.cc
new file mode 100644
index 0000000..a0009cc
--- /dev/null
+++ b/gpu/demos/stencil_test/main.cc
@@ -0,0 +1,63 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This example shows various stencil buffer operations.
+
+#include "gpu/demos/app_framework/application.h"
+#include "third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.h"
+
+namespace gpu_demos {
+class StencilTest : public Application {
+ public:
+  StencilTest();
+  ~StencilTest();
+
+  bool Init();
+
+ protected:
+  virtual void Draw(float elapsed_sec);
+
+ private:
+  ESContext context_;
+  STUserData user_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(StencilTest);
+};
+
+StencilTest::StencilTest() {
+  esInitContext(&context_);
+
+  memset(&user_data_, 0, sizeof(STUserData));
+  context_.userData = &user_data_;
+}
+
+StencilTest::~StencilTest() {
+  stShutDown(&context_);
+}
+
+bool StencilTest::Init() {
+  if (!Application::InitRenderContext()) return false;
+
+  context_.width = width();
+  context_.height = height();
+  if (!stInit(&context_)) return false;
+
+  return true;
+}
+
+void StencilTest::Draw(float /*elapsed_sec*/) {
+  stDraw(&context_);
+}
+}  // namespace gpu_demos
+
+int main(int argc, char *argv[]) {
+  gpu_demos::StencilTest app;
+  if (!app.Init()) {
+    printf("Could not init.\n");
+    return EXIT_FAILURE;
+  }
+
+  app.MainLoop();
+  return EXIT_SUCCESS;
+}
diff --git a/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.c b/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.c
index 28091903..b884e8d 100644
--- a/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.c
+++ b/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.c
@@ -14,30 +14,14 @@
 //    operations.
 //
 #include <stdlib.h>
-#include "esUtil.h"
-
-typedef struct
-{
-   // Handle to a program object
-   GLuint programObject;
-
-   // Attribute locations
-   GLint  positionLoc;
-
-   // Uniform locations
-   GLint  colorLoc;
-
-   // Vertex buffer object handles
-   GLuint vboIds[2];
-
-} UserData;
+#include "Stencil_Test.h"
 
 ///
 // Initialize the shader and program object
 //
-int Init ( ESContext *esContext )
+int stInit ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   STUserData *userData = esContext->userData;
    GLbyte vShaderStr[] =  
       "attribute vec4 a_position;   \n"
       "void main()                  \n"
@@ -122,12 +106,12 @@ int Init ( ESContext *esContext )
 // Initialize the stencil buffer values, and then use those
 //   values to control rendering
 //
-void Draw ( ESContext *esContext )
+void stDraw ( ESContext *esContext )
 {
    int  i;
    GLubyte *offset = NULL;
 
-   UserData *userData = esContext->userData;
+   STUserData *userData = esContext->userData;
 
 #define NumTests  4
    GLfloat  colors[NumTests][4] = { 
@@ -251,16 +235,14 @@ void Draw ( ESContext *esContext )
       glUniform4fv( userData->colorLoc, 1, colors[i] );
       glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, offset );
    }
-
-   eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
 }
 
 ///
 // Cleanup
 //
-void ShutDown ( ESContext *esContext )
+void stShutDown ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   STUserData *userData = esContext->userData;
 
    // Delete program object
    glDeleteProgram ( userData->programObject );
@@ -268,25 +250,3 @@ void ShutDown ( ESContext *esContext )
    // Delete vertex buffer objects
    glDeleteBuffers ( 2, userData->vboIds );
 }
-
-
-int main ( int argc, char *argv[] )
-{
-   ESContext esContext;
-   UserData  userData;
-
-   esInitContext ( &esContext );
-   esContext.userData = &userData;
-
-   esCreateWindow ( &esContext, "Stencil Test", 320, 240,
-                    ES_WINDOW_RGB | ES_WINDOW_DEPTH | ES_WINDOW_STENCIL );
-   
-   if ( !Init ( &esContext ) )
-      return 0;
-
-   esRegisterDrawFunc ( &esContext, Draw );
-   
-   esMainLoop ( &esContext );
-
-   ShutDown ( &esContext );
-}
diff --git a/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.h b/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.h
new file mode 100644
index 0000000..ff6bff9
--- /dev/null
+++ b/third_party/gles2_book/Chapter_11/Stencil_Test/Stencil_Test.h
@@ -0,0 +1,45 @@
+//
+// 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
+//
+
+#ifndef STENCIL_TEST_H
+#define STENCIL_TEST_H
+
+#include "esUtil.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+typedef struct
+{
+   // Handle to a program object
+   GLuint programObject;
+
+   // Attribute locations
+   GLint  positionLoc;
+
+   // Uniform locations
+   GLint  colorLoc;
+
+   // Vertex buffer object handles
+   GLuint vboIds[2];
+
+} STUserData;
+
+extern int stInit ( ESContext *esContext );
+
+extern void stDraw ( ESContext *esContext );
+
+extern void stShutDown ( ESContext *esContext );
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // STENCIL_TEST_H
diff --git a/third_party/gles2_book/gles2_book.gyp b/third_party/gles2_book/gles2_book.gyp
index e4975dc..97b351f 100644
--- a/third_party/gles2_book/gles2_book.gyp
+++ b/third_party/gles2_book/gles2_book.gyp
@@ -84,6 +84,17 @@
       ],
     },
     {
+      'target_name': 'stencil_test',
+      'type': 'static_library',
+      'dependencies': [
+        'es_util',
+      ],
+      'sources': [
+        'Chapter_11/Stencil_Test/Stencil_Test.c',
+        'Chapter_11/Stencil_Test/Stencil_Test.h',
+      ],
+    },
+    {
       'target_name': 'texture_wrap',
       'type': 'static_library',
       'dependencies': [