Adding reduced version of sdk at 1387 to chrome tree.

BUG=None
TEST=None
R=noelallen@google.com

TBR

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110822 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 95 insertions, 0 deletions

diff --git a/native_client_sdk/src/examples/tumbler/shader_util.cc b/native_client_sdk/src/examples/tumbler/shader_util.cc
new file mode 100644
index 0000000..2bbfc84
--- /dev/null
+++ b/native_client_sdk/src/examples/tumbler/shader_util.cc
@@ -0,0 +1,95 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "examples/tumbler/shader_util.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+namespace shader_util {
+
+GLuint CreateShaderOfType(GLenum type, const char *shader_src) {
+  GLuint shader;
+  GLint compiled;
+
+  // Create the shader object
+  shader = glCreateShader(type);
+
+  if (shader == 0)
+    return 0;
+
+  // Load and compile the shader source
+  glShaderSource(shader, 1, &shader_src, NULL);
+  glCompileShader(shader);
+
+  // Check the compile status
+  glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
+  if (compiled == 0) {
+    GLint info_len = 0;
+    glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len);
+    if (info_len > 1) {
+      char* info_log = reinterpret_cast<char*>(malloc(sizeof(char) * info_len));
+      glGetShaderInfoLog(shader, info_len, NULL, info_log);
+      // TODO(dspringer): We could really use a logging API.
+      printf("Error compiling shader:\n%s\n", info_log);
+      free(info_log);
+    }
+    glDeleteShader(shader);
+    return 0;
+  }
+
+  return shader;
+}
+
+GLuint CreateProgramFromVertexAndFragmentShaders(
+    const char *vertex_shader_src, const char *fragment_shader_src) {
+  GLuint vertex_shader;
+  GLuint fragment_shader;
+  GLuint program_object;
+  GLint linked;
+
+  // Load the vertex/fragment shaders
+  vertex_shader = CreateShaderOfType(GL_VERTEX_SHADER, vertex_shader_src);
+  if (vertex_shader == 0)
+    return 0;
+  fragment_shader = CreateShaderOfType(GL_FRAGMENT_SHADER, fragment_shader_src);
+  if (fragment_shader == 0) {
+    glDeleteShader(vertex_shader);
+    return 0;
+  }
+
+  // Create the program object and attach the shaders.
+  program_object = glCreateProgram();
+  if (program_object == 0)
+    return 0;
+  glAttachShader(program_object, vertex_shader);
+  glAttachShader(program_object, fragment_shader);
+
+  // Link the program
+  glLinkProgram(program_object);
+
+  // Check the link status
+  glGetProgramiv(program_object, GL_LINK_STATUS, &linked);
+  if (linked == 0) {
+    GLint info_len = 0;
+    glGetProgramiv(program_object, GL_INFO_LOG_LENGTH, &info_len);
+    if (info_len > 1) {
+      char* info_log = reinterpret_cast<char*>(malloc(info_len));
+      glGetProgramInfoLog(program_object, info_len, NULL, info_log);
+      // TODO(dspringer): We could really use a logging API.
+      printf("Error linking program:\n%s\n", info_log);
+      free(info_log);
+    }
+    glDeleteProgram(program_object);
+    return 0;
+  }
+
+  // Delete these here because they are attached to the program object.
+  glDeleteShader(vertex_shader);
+  glDeleteShader(fragment_shader);
+
+  return program_object;
+}
+
+}  // namespace shader_util