Renamed gles_book_examples to gles2_book to make it shorter and more correct. I still need to rename gles_book_examples.gyp to gles2_book.gyp. I will do it in another CL as svn does not like changes in renamed directories.

TBR=apatrick
Review URL: http://codereview.chromium.org/543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35875 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 147 insertions, 0 deletions

diff --git a/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.c b/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.c
new file mode 100644
index 0000000..6021f687
--- /dev/null
+++ b/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.c
@@ -0,0 +1,109 @@
+//
+// 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
+//
+
+// Hello_Triangle.c
+//
+//    This is a simple example that draws a single triangle with
+//    a minimal vertex/fragment shader.  The purpose of this 
+//    example is to demonstrate the basic concepts of 
+//    OpenGL ES 2.0 rendering.
+
+#include "Hello_Triangle.h"
+
+#include <stdlib.h>
+
+///
+// Initialize the shader and program object
+//
+int htInit ( ESContext *esContext )
+{
+   HTUserData *userData = esContext->userData;
+
+   GLbyte vShaderStr[] =  
+      "attribute vec4 vPosition;    \n"
+      "void main()                  \n"
+      "{                            \n"
+      "   gl_Position = vPosition;  \n"
+      "}                            \n";
+   
+   // TODO(alokp): Shaders containing "precision" do not compile.
+   GLbyte fShaderStr[] =  
+      "//precision mediump float;                      \n"
+      "void main()                                   \n"
+      "{                                             \n"
+      "   gl_FragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );\n"
+      "}                                             \n";
+
+   GLfloat vVertices[] = {  0.0f,  0.5f, 0.0f, 
+                           -0.5f, -0.5f, 0.0f,
+                            0.5f, -0.5f, 0.0f };
+
+   userData->programObject = esLoadProgram ( vShaderStr, fShaderStr );
+   if ( userData->programObject == 0 ) return FALSE;
+
+   // Bind vPosition to attribute 0   
+   glBindAttribLocation ( userData->programObject, 0, "vPosition" );
+
+   glGenBuffers ( 1, &userData->vbo );
+   glBindBuffer ( GL_ARRAY_BUFFER, userData->vbo );
+   glBufferData ( GL_ARRAY_BUFFER, sizeof(vVertices), NULL, GL_STATIC_DRAW );
+   glBufferSubData ( GL_ARRAY_BUFFER, 0, sizeof(vVertices), vVertices );
+
+   glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
+   return TRUE;
+}
+
+///
+// Draw a triangle using the shader pair created in Init()
+//
+void htDraw ( ESContext *esContext )
+{
+   HTUserData *userData = esContext->userData;
+
+   // Set the viewport
+   glViewport ( 0, 0, esContext->width, esContext->height );
+   
+   // Clear the color buffer
+   glClear ( GL_COLOR_BUFFER_BIT );
+
+   // Use the program object
+   glUseProgram ( userData->programObject );
+
+   // Load the vertex data
+   glBindBuffer ( GL_ARRAY_BUFFER, userData->vbo );
+   glEnableVertexAttribArray ( 0 );
+   glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, 0 );
+
+   glDrawArrays ( GL_TRIANGLES, 0, 3 );
+
+   // Nothing is drawn or application crashes without glFlush.
+   // TODO(alokp): glFlush should not be necessary with SwapBuffers().
+   glFlush();
+}
+
+///
+// Cleanup
+//
+void htShutDown ( ESContext *esContext )
+{
+   HTUserData *userData = esContext->userData;
+
+   // Delete program object
+   if ( userData->programObject != 0 )
+   {
+      glDeleteProgram ( userData->programObject );
+      userData->programObject = 0;
+   }
+   if ( userData->vbo != 0 )
+   {
+      glDeleteBuffers ( 1, &userData->vbo );
+      userData->vbo = 0;
+   }
+}
diff --git a/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.h b/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.h
new file mode 100644
index 0000000..4e90d2f
--- /dev/null
+++ b/third_party/gles2_book/Chapter_2/Hello_Triangle/Hello_Triangle.h
@@ -0,0 +1,38 @@
+//
+// 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 HELLO_TRIANGLE_H
+#define HELLO_TRIANGLE_H
+
+#include "esUtil.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+typedef struct
+{
+   // Handle to a program object
+   GLuint programObject;
+   // Handle to vbo object
+   GLuint vbo;
+
+} HTUserData;
+
+extern int htInit ( ESContext *esContext );
+
+extern void htDraw ( ESContext *esContext );
+
+extern void htShutDown ( ESContext *esContext );
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // HELLO_TRIANGLE_H