Game Development Reference
In-Depth Information
else
{
GLES20.glAttachShader(m_ShaderProgram,m_FragmentShader);
Log.d("DEBUG - FRAGMENT SHADER ATTACHED ",
"In InitFragmentShader()");
}
}
The
ReadInShader()
function is called by the
InitFragmentShader()
and
InitVertexShader()
functions (see Listing 4-10).
Listing 4-10.
ReadInShader()
Function
StringBuffer ReadInShader(int ResourceId)
{
StringBuffer TempBuffer = new StringBuffer();
InputStream inputStream = m_Context.getResources().openRawResource(ResourceId);
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
try
{
String read = in.readLine();
while (read != null)
{
TempBuffer.append(read + "\n");
read = in.readLine();
}
}
catch (Exception e)
{
//Send a ERROR log message and log the exception.
Log.e("ERROR - SHADER READ ERROR",
"Error in ReadInShader(): " +
e.getLocalizedMessage());
}
return TempBuffer;
}
First, a new string buffer object is created, called
TempBuffer
.
Next, a new
InputStream
object is created from the shader source file, using the file's resource
id. This input stream is then used to create an
InputStreamReader
, which is then used to create a
BufferedReader
object called “
in
.” The
in
object is then used to read in the shader source code
line by line, and each line is added to the
TempBuffer
string buffer that was created first. If any error
occurs, an error message is printed out in the Android LogCat window within the Eclipse IDE.
Finally, the shader source code is returned in a
StringBuffer
object.
The imports that bring BufferedReader, InputStreamReader, and InputStream into the current
namespace are as follows:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
