/**
* Deletes program and shaders associated with it.
*/
public void DeleteProgram()
{
GLES20.GlDeleteShader(_shaderFragment);
GLES20.GlDeleteShader(_shaderVertex);
GLES20.GlDeleteProgram(_program);
_program = _shaderVertex = _shaderFragment = 0;
}
/// <summary>
/// Converts a raw text file, saved as a resource, into an OpenGL ES shader.
/// </summary>
/// <param name="tag"></param>
/// <param name="context"></param>
/// <param name="type">The type of shader we will be creating.</param>
/// <param name="resId">The resource ID of the raw text file about to be turned into a shader.</param>
/// <returns>The shader object handler.</returns>
public static int LoadGLShader(string tag, Context context, int type, int resId)
{
string code = ReadRawTextFile(context, resId);
int shader = GLES20.GlCreateShader(type);
GLES20.GlShaderSource(shader, code);
GLES20.GlCompileShader(shader);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
Log.Error(tag, "Error compiling shader: " + GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
if (shader == 0)
{
throw new RuntimeException("Error creating shader.");
}
return(shader);
}
public static int LoadGLShader(string tag, Context context, int type, int resId)
{
var code = ReadRawTextFile(context, resId);
var shader = GLES20.GlCreateShader(type);
GLES20.GlShaderSource(shader, code);
GLES20.GlCompileShader(shader);
var compileStatus = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compileStatus, 0);
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(shader);
shader = 0;
}
if (shader == 0)
{
throw new Exception("Error creating shader");
}
return(shader);
}
/**
* Converts a raw text file, saved as a resource, into an OpenGL ES shader.
*/
int loadGLShader(int type, int resId)
{
var code = ReadRawTextFile(resId);
var shader = GLES20.GlCreateShader(type);
GLES20.GlShaderSource(shader, code);
GLES20.GlCompileShader(shader);
// Get the compilation status.
var compileStatus = new int [1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus [0] == 0)
{
Android.Util.Log.Error(TAG, "Error compiling shader: " + GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
if (shader == 0)
{
throw new Exception("Error creating shader.");
}
return(shader);
}
public static int LoadShader(int shaderType, string source)
{
try
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
string info = GLES20.GlGetShaderInfoLog(shader);
GLES20.GlDeleteShader(shader);
throw new RuntimeException("Could not compile shader " + shaderType + ":" + info);
}
}
return(shader);
}
catch (Exception e)
{
Methods.DisplayReportResultTrack(e);
return(0);
}
}
// Compile & attach a |type| shader specified by |source| to |program|.
private static void addShaderTo(int type, string source, int program)
{
int[] result = new int[] { GLES20.GlFalse };
int shader = GLES20.GlCreateShader(type);
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, result, 0);
abortUnless(result[0] == GLES20.GlTrue, GLES20.GlGetShaderInfoLog(shader) + ", source: " + source);
GLES20.GlAttachShader(program, shader);
GLES20.GlDeleteShader(shader);
checkNoGLES2Error();
}
private int loadShader(int shaderType, String source) {
int shader = GLES20.GlCreateShader(shaderType);
checkGlError("glCreateShader type=" + shaderType);
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0) {
Log.Error(TAG, "Could not compile shader " + shaderType + ":");
Log.Error(TAG, " " + GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
return shader;
}
/**
* \brief Compile shader code.
* @param shaderType type of shader (either GLES20.GL_VERTEX_SHADER or GLES20.GL_FRAGMENT_SHADER).
* @param source source code of the shader.
* @return gl shader id.
*/
private static int initShader(int shaderType, string source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] glStatusVar = { GLES20.GlFalse };
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, glStatusVar, 0);
if (glStatusVar[0] == GLES20.GlFalse)
{
//Log.e("RenderUtils", "initShader could NOT compile shader " + shaderType + " : " + GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
}
return(shader);
}
private int LoadShader(int shaderType, string source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus,
compiled, 0);
if (compiled[0] == 0)
{
GLES20.GlDeleteShader(shader);
shader = 0;
}
}
return(shader);
}
/**
* Helper method for compiling a shader.
*
* @param shaderType
* Type of shader to compile
* @param source
* String presentation for shader
* @return id for compiled shader
*/
private int LoadShader(int shaderType, string source)
{
var shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
var error = GLES20.GlGetShaderInfoLog(shader);
GLES20.GlDeleteShader(shader);
throw new Exception(error);
}
}
return(shader);
}
public static int LoadShader(int shaderType, string source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
var compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled [0] == 0)
{
string info = GLES20.GlGetShaderInfoLog(shader);
GLES20.GlDeleteShader(shader);
throw new InvalidOperationException("Could not compile shader " +
shaderType + ":" + info);
}
}
return(shader);
}
private int loadShader(int shaderType, String source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, 35713, compiled, 0);
if (compiled[0] == 0)
{
Log.Error("DistortionRenderer", "Could not compile shader " + shaderType + ":");
Log.Error("DistortionRenderer", GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
}
return(shader);
}
private static int LoadShader(int shaderType, string source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (0 != shader)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
Log.Debug(TAG, "glError: Could not compile shader " + shaderType);
Log.Debug(TAG, "GLES20 Error: " + GLES20.GlGetShaderInfoLog(shader));
GLES20.GlDeleteShader(shader);
shader = 0;
}
}
return(shader);
}
private int loadShader(int shaderType, String source)
{
int shader = GLES20.GlCreateShader(shaderType);
if (shader != 0)
{
GLES20.GlShaderSource(shader, source);
GLES20.GlCompileShader(shader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(shader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
Log.Error(TAG, "Could not compile shader " + shaderType + ":");
Log.Error(TAG, GLES20.GlGetShaderInfoLog(shader));
Log.Error(TAG, "message ends.");
GLES20.GlDeleteShader(shader);
shader = 0;
}
}
return(shader);
}
private static int loadShader(String vss, String fss)
{
int vshader = GLES20.GlCreateShader(GLES20.GlVertexShader);
GLES20.GlShaderSource(vshader, vss);
GLES20.GlCompileShader(vshader);
int[] compiled = new int[1];
GLES20.GlGetShaderiv(vshader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
//Log.e("Shader", "Could not compile vshader");
//Log.v("Shader", "Could not compile vshader:" + GLES20.glGetShaderInfoLog(vshader));
GLES20.GlDeleteShader(vshader);
vshader = 0;
}
int fshader = GLES20.GlCreateShader(GLES20.GlFragmentShader);
GLES20.GlShaderSource(fshader, fss);
GLES20.GlCompileShader(fshader);
GLES20.GlGetShaderiv(fshader, GLES20.GlCompileStatus, compiled, 0);
if (compiled[0] == 0)
{
/*Log.e("Shader", "Could not compile fshader");
* Log.v("Shader", "Could not compile fshader:" + GLES20.glGetShaderInfoLog(fshader));*/
GLES20.GlDeleteShader(fshader);
fshader = 0;
}
int program = GLES20.GlCreateProgram();
GLES20.GlAttachShader(program, vshader);
GLES20.GlAttachShader(program, fshader);
GLES20.GlLinkProgram(program);
return(program);
}
public virtual void Delete()
{
GLES20.GlDeleteShader(handle);
}
public void OnSurfaceCreated(IGL10 gl, Javax.Microedition.Khronos.Egl.EGLConfig config)
{
const float coord = 1.0f;
ObjParser model3D = new ObjParser();
List <byte[]> test1 = model3D.ParsedObject(context, "buggy");
float[] vertexArray = new float[test1[0].Length / 4];
System.Buffer.BlockCopy(test1[0], 0, vertexArray, 0, (int)test1[0].Length);
modelVerticesData = vertexArray;
FloatBuffer mTriangleVertices = ByteBuffer.AllocateDirect(modelVerticesData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleVertices.Put(modelVerticesData).Flip();
// Cube colors
// R, G, B, A
float[] modelColorsData =
{
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f
};
FloatBuffer mTriangleColors = ByteBuffer.AllocateDirect(modelColorsData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleColors.Put(modelColorsData).Flip();
float[] textureUVMapArray = new float[test1[1].Length / 4];
System.Buffer.BlockCopy(test1[1], 0, textureUVMapArray, 0, (int)test1[1].Length);
modelTextureUVMapData = textureUVMapArray;
FloatBuffer mTriangleTextureUVMap = ByteBuffer.AllocateDirect(modelTextureUVMapData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleTextureUVMap.Put(modelTextureUVMapData).Flip();
//Data buffers to VBO
GLES20.GlGenBuffers(3, VBOBuffers, 0); //2 buffers for vertices, texture and colors
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[0]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleVertices.Capacity() * mBytesPerFloat, mTriangleVertices, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[1]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleColors.Capacity() * mBytesPerFloat, mTriangleColors, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[2]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleTextureUVMap.Capacity() * mBytesPerFloat, mTriangleTextureUVMap, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, 0);
//Load and setup texture
GLES20.GlGenTextures(1, textureHandle, 0); //init 1 texture storage handle
if (textureHandle[0] != 0)
{
//Android.Graphics cose class Matrix exists at both Android.Graphics and Android.OpenGL and this is only sample of using
Android.Graphics.BitmapFactory.Options options = new Android.Graphics.BitmapFactory.Options();
options.InScaled = false; // No pre-scaling
Android.Graphics.Bitmap bitmap = Android.Graphics.BitmapFactory.DecodeResource(context.Resources, Resource.Drawable.iam, options);
GLES20.GlBindTexture(GLES20.GlTexture2d, textureHandle[0]);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureMinFilter, GLES20.GlNearest);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureMagFilter, GLES20.GlNearest);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureWrapS, GLES20.GlClampToEdge);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureWrapT, GLES20.GlClampToEdge);
GLUtils.TexImage2D(GLES20.GlTexture2d, 0, bitmap, 0);
bitmap.Recycle();
}
//Ask android to run RAM garbage cleaner
System.GC.Collect();
//Setup OpenGL ES
GLES20.GlClearColor(coord, coord, coord, coord);
// GLES20.GlEnable(GLES20.GlDepthTest); //uncoment if needs enabled dpeth test
GLES20.GlEnable(2884); // GlCullFace == 2884 see OpenGL documentation to this constant value
GLES20.GlCullFace(GLES20.GlBack);
// Position the eye behind the origin.
float eyeX = 0.0f;
float eyeY = 0.0f;
float eyeZ = 4.5f;
// We are looking toward the distance
float lookX = 0.0f;
float lookY = 0.0f;
float lookZ = -5.0f;
// Set our up vector. This is where our head would be pointing were we holding the camera.
float upX = 0.0f;
float upY = coord;
float upZ = 0.0f;
// Set the view matrix. This matrix can be said to represent the camera position.
// NOTE: In OpenGL 1, a ModelView matrix is used, which is a combination of a model and
// view matrix. In OpenGL 2, we can keep track of these matrices separately if we choose.
Matrix.SetLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);
string vertexShader =
"uniform mat4 u_MVPMatrix; \n" // A constant representing the combined model/view/projection matrix.
+ "attribute vec4 a_Position; \n" // Per-vertex position information we will pass in.
+ "attribute vec4 a_Color; \n" // Per-vertex color information we will pass in.
+ "varying vec4 v_Color; \n" // This will be passed into the fragment shader.
+ "attribute vec2 a_TextureCoord; \n"
+ "varying vec2 v_TextureCoord; \n"
+ "void main() \n" // The entry point for our vertex shader.
+ "{ \n"
+ " v_TextureCoord = a_TextureCoord; \n" // Pass the color through to the fragment shader. It will be interpolated across the triangle.
+ " v_Color = a_Color; \n" // Pass the color through to the fragment shader. It will be interpolated across the triangle.
+ " gl_Position = u_MVPMatrix \n" // gl_Position is a special variable used to store the final position.
+ " * a_Position; \n" // Multiply the vertex by the matrix to get the final point in normalized screen coordinates.
+ "} \n";
string fragmentShader =
"precision mediump float; \n" // Set the default precision to medium. We don't need as high of a
// precision in the fragment shader.
+ "varying vec4 v_Color; \n" // This is the color from the vertex shader interpolated across the triangle per fragment.
+ "varying vec2 v_TextureCoord; \n"
+ "uniform sampler2D u_Texture; \n"
+ "void main() \n" // The entry point for our fragment shader.
+ "{ \n"
+ " gl_FragColor = texture2D(u_Texture, v_TextureCoord); \n" // Pass the color directly through the pipeline.
+ "} \n";
vertexShader = string.Empty;
fragmentShader = string.Empty;
int resourceId = context.Resources.GetIdentifier("vertexshadervladimir1", "raw", context.PackageName);
Stream fileStream = context.Resources.OpenRawResource(resourceId);
StreamReader streamReader = new StreamReader(fileStream);
string line = string.Empty;
while ((line = streamReader.ReadLine()) != null)
{
vertexShader += line + "\n";
}
resourceId = context.Resources.GetIdentifier("fragmentshadervladimir1", "raw", context.PackageName);
fileStream = context.Resources.OpenRawResource(resourceId);
streamReader = new StreamReader(fileStream);
while ((line = streamReader.ReadLine()) != null)
{
fragmentShader += line + "\n";
}
int vertexShaderHandle = GLES20.GlCreateShader(GLES20.GlVertexShader);
if (vertexShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(vertexShaderHandle, vertexShader);
// Compile the shader.
GLES20.GlCompileShader(vertexShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(vertexShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(vertexShaderHandle);
vertexShaderHandle = 0;
}
}
if (vertexShaderHandle == 0)
{
throw new Exception("Error creating vertex shader.");
}
// Load in the fragment shader shader.
int fragmentShaderHandle = GLES20.GlCreateShader(GLES20.GlFragmentShader);
if (fragmentShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(fragmentShaderHandle, fragmentShader);
// Compile the shader.
GLES20.GlCompileShader(fragmentShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(fragmentShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(fragmentShaderHandle);
fragmentShaderHandle = 0;
}
}
if (fragmentShaderHandle == 0)
{
throw new Exception("Error creating fragment shader.");
}
// Create a program object and store the handle to it.
int programHandle = GLES20.GlCreateProgram();
if (programHandle != 0)
{
// Bind the vertex shader to the program.
GLES20.GlAttachShader(programHandle, vertexShaderHandle);
// Bind the fragment shader to the program.
GLES20.GlAttachShader(programHandle, fragmentShaderHandle);
// Bind attributes
GLES20.GlBindAttribLocation(programHandle, 0, "a_Position");
GLES20.GlBindAttribLocation(programHandle, 1, "a_Color");
GLES20.GlBindAttribLocation(programHandle, 2, "a_TextureCoord");
// Link the two shaders together into a program.
GLES20.GlLinkProgram(programHandle);
// Get the link status.
int[] linkStatus = new int[1];
GLES20.GlGetProgramiv(programHandle, GLES20.GlLinkStatus, linkStatus, 0);
// If the link failed, delete the program.
if (linkStatus[0] == 0)
{
GLES20.GlDeleteProgram(programHandle);
programHandle = 0;
}
}
if (programHandle == 0)
{
throw new Exception("Error creating program.");
}
// Set program handles. These will later be used to pass in values to the program.
mMVPMatrixHandle = GLES20.GlGetUniformLocation(programHandle, "u_MVPMatrix");
mPositionHandle = GLES20.GlGetAttribLocation(programHandle, "a_Position");
mColorHandle = GLES20.GlGetAttribLocation(programHandle, "a_Color");
mTextureCoordHandle = GLES20.GlGetAttribLocation(programHandle, "a_TextureCoord");
mTextureHandle = GLES20.GlGetUniformLocation(programHandle, "u_Texture");
// Tell OpenGL to use this program when rendering.
GLES20.GlUseProgram(programHandle);
}
public string Compile()
{
string result = string.Empty;
string vertexShader = string.Empty;
string fragmentShader = string.Empty;
int resourceId = context.Resources.GetIdentifier(vertexShaderFile, "raw", context.PackageName);
Stream fileStream = context.Resources.OpenRawResource(resourceId);
StreamReader streamReader = new StreamReader(fileStream);
string line = string.Empty;
while ((line = streamReader.ReadLine()) != null)
{
vertexShader += line + "\n";
}
resourceId = context.Resources.GetIdentifier(fragmentShaderFile, "raw", context.PackageName);
fileStream = context.Resources.OpenRawResource(resourceId);
streamReader = new StreamReader(fileStream);
while ((line = streamReader.ReadLine()) != null)
{
fragmentShader += line + "\n";
}
int vertexShaderHandle = GLES20.GlCreateShader(GLES20.GlVertexShader);
if (vertexShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(vertexShaderHandle, vertexShader);
// Compile the shader.
GLES20.GlCompileShader(vertexShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(vertexShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
result += "vertex shader error";
result += GLES20.GlGetProgramInfoLog(vertexShaderHandle);
GLES20.GlDeleteShader(vertexShaderHandle);
vertexShaderHandle = 0;
}
}
// Load in the fragment shader shader.
int fragmentShaderHandle = GLES20.GlCreateShader(GLES20.GlFragmentShader);
if (fragmentShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(fragmentShaderHandle, fragmentShader);
// Compile the shader.
GLES20.GlCompileShader(fragmentShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(fragmentShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
result += "fragment shader error";
result += GLES20.GlGetProgramInfoLog(fragmentShaderHandle);
GLES20.GlDeleteShader(fragmentShaderHandle);
fragmentShaderHandle = 0;
return(result);
}
}
// Create a program object and store the handle to it.
programHandle = GLES20.GlCreateProgram();
if (programHandle != 0)
{
// Bind the vertex shader to the program.
GLES20.GlAttachShader(programHandle, vertexShaderHandle);
// Bind the fragment shader to the program.
GLES20.GlAttachShader(programHandle, fragmentShaderHandle);
// Bind attributes
GLES20.GlBindAttribLocation(programHandle, 0, "a_Position");
GLES20.GlBindAttribLocation(programHandle, 1, "a_Color");
GLES20.GlBindAttribLocation(programHandle, 2, "a_TextureCoord");
GLES20.GlBindAttribLocation(programHandle, 3, "a_Normal");
// Link the two shaders together into a program.
GLES20.GlLinkProgram(programHandle);
// Get the link status.
int[] linkStatus = new int[1];
GLES20.GlGetProgramiv(programHandle, GLES20.GlLinkStatus, linkStatus, 0);
// If the link failed, delete the program.
if (linkStatus[0] == 0)
{
result += "shader link error";
result += GLES20.GlGetProgramInfoLog(programHandle);
GLES20.GlDeleteProgram(programHandle);
programHandle = 0;
return(result);
}
}
// Set program handles. These will later be used to pass in values to the program.
mMVPMatrixHandle = GLES20.GlGetUniformLocation(programHandle, "u_MVPMatrix");
mLightPos = GLES20.GlGetUniformLocation(programHandle, "u_LightPos");
mPositionHandle = GLES20.GlGetAttribLocation(programHandle, "a_Position");
mColorHandle = GLES20.GlGetAttribLocation(programHandle, "a_Color");
mTextureCoordHandle = GLES20.GlGetAttribLocation(programHandle, "a_TextureCoord");
mNormalHandle = GLES20.GlGetAttribLocation(programHandle, "a_Normal");
mTextureHandle = GLES20.GlGetUniformLocation(programHandle, "u_Texture");
return(result);
}
void GLSurfaceView.IRenderer.OnSurfaceCreated(IGL10 gl, Javax.Microedition.Khronos.Egl.EGLConfig config)
{
//Set the background clear color to gray
GLES20.GlClearColor(0.5f, 0.5f, 0.5f, 0.5f);
//Position the eye behind the origin.
float eyeX = 0.0f;
float eyeY = 0.0f;
float eyeZ = 0.0f;
//We are looking toward the distance.
float lookX = 0.0f;
float lookY = 0.0f;
float lookZ = -5.0f;
//Set our up vector,This is where our head wold be pointing were we holding the camera
float upX = 0.0f;
float upY = 1.0f;
float upZ = 0.0f;
Matrix.SetLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);
string vertexShader = "uniform mat4 u_MVPMatrix; \n" +
"attribute vec4 a_Position;\n" +
"attribute vec4 a_Color;\n" +
"varying vec4 v_Color; \n" +
"void main() \n" +
"{ \n" +
"v_Color = a_Color; \n" +
"gl_Position = u_MVPMatrix \n" +
"*a_Position; \n" +
"} \n";
string fragmentShader = "precision mediump float; \n" +
"varying vec4 v_Color; \n" +
"void main() \n" +
"{ \n" +
"gl_FragColor=v_Color; \n" +
"}";
int vertexShaderHandle = GLES20.GlCreateShader(GLES20.GlVertexShader);
if (vertexShaderHandle != 0)
{
//Pass in the shader source.
GLES20.GlShaderSource(vertexShaderHandle, vertexShader);
//Compile the shader
GLES20.GlCompileShader(vertexShaderHandle);
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(vertexShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
//If the compilation failed,delete the shader
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(vertexShaderHandle);
vertexShaderHandle = 0;
}
}
if (vertexShaderHandle == 0)
{
throw new ArgumentException("Error creating vertex shader.");
}
//Load in the fragment shader shader.
int fragmentShaderHandle = GLES20.GlCreateShader(GLES20.GlFragmentShader);
if (fragmentShaderHandle != 0)
{
//Pass in the shader source.
GLES20.GlShaderSource(fragmentShaderHandle, fragmentShader);
//Compile the shader.
GLES20.GlCompileShader(fragmentShaderHandle);
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(fragmentShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(fragmentShaderHandle);
fragmentShaderHandle = 0;
}
}
if (fragmentShaderHandle == 0)
{
throw new ArgumentException("Error createing fragment shader");
}
//Create a program object and store the handle to it.
int programHandle = GLES20.GlCreateProgram();
if (programHandle != 0)
{
//Bind the vertex shader to the program.
GLES20.GlAttachShader(programHandle, vertexShaderHandle);
//Bind the fragment shader to the program.
GLES20.GlAttachShader(programHandle, fragmentShaderHandle);
//Bind attributes.
GLES20.GlBindAttribLocation(programHandle, 0, "a_Position");
GLES20.GlBindAttribLocation(programHandle, 1, "a_Color");
//Link the two shaders together into a program.
GLES20.GlLinkProgram(programHandle);
//Get the link status.
int[] linkStatus = new int[1];
GLES20.GlGetProgramiv(programHandle, GLES20.GlLinkStatus, linkStatus, 0);
//If the link failed ,delete the program
if (linkStatus[0] == 0)
{
GLES20.GlDeleteProgram(programHandle);
programHandle = 0;
}
}
if (programHandle == 0)
{
throw new ArgumentException("Error creating program.");
}
//Set program handles. These will later be used to pass in values
mMVPMatrixHandle = GLES20.GlGetUniformLocation(programHandle, "u_MVPMatrix");
mPositionHandle = GLES20.GlGetAttribLocation(programHandle, "a_Position");
mColorHandle = GLES20.GlGetAttribLocation(programHandle, "a_Color");
//Tell OpenGL to use this program when rendering.
GLES20.GlUseProgram(programHandle);
}
private int[] VBOBuffers = new int[2]; //2 buffers for vertices and colors
public void OnSurfaceCreated(IGL10 gl, Javax.Microedition.Khronos.Egl.EGLConfig config)
{
const float edge = 1.0f;
// X, Y, Z,
float[] triangleVerticesData =
{
-1.5f, -0.25f, 0.0f,
0.5f, -0.25f, 0.0f,
0.0f, 0.559016994f, 0.0f
};
FloatBuffer mTriangleVertices = ByteBuffer.AllocateDirect(triangleVerticesData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleVertices.Put(triangleVerticesData).Flip();
// R, G, B, A
float[] triangleColorsData =
{
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f
};
FloatBuffer mTriangleColors = ByteBuffer.AllocateDirect(triangleColorsData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleColors.Put(triangleColorsData).Flip();
//Use VBO
GLES20.GlGenBuffers(2, VBOBuffers, 0); //2 buffers for vertices and colors
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[0]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleVertices.Capacity() * mBytesPerFloat, mTriangleVertices, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[1]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleColors.Capacity() * mBytesPerFloat, mTriangleColors, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, 0);
GLES20.GlClearColor(1.0f, 1.0f, 1.0f, 1.0f);
// Position the eye behind the origin.
float eyeX = 0.0f;
float eyeY = 0.0f;
float eyeZ = 4.5f;
// We are looking toward the distance
float lookX = 0.0f;
float lookY = 0.0f;
float lookZ = -5.0f;
// Set our up vector. This is where our head would be pointing were we holding the camera.
float upX = 0.0f;
float upY = 1.0f;
float upZ = 0.0f;
// Set the view matrix. This matrix can be said to represent the camera position.
// NOTE: In OpenGL 1, a ModelView matrix is used, which is a combination of a model and
// view matrix. In OpenGL 2, we can keep track of these matrices separately if we choose.
Matrix.SetLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);
string vertexShader =
"uniform mat4 u_MVPMatrix; \n" // A constant representing the combined model/view/projection matrix.
+ "attribute vec4 a_Position; \n" // Per-vertex position information we will pass in.
+ "attribute vec4 a_Color; \n" // Per-vertex color information we will pass in.
+ "varying vec4 v_Color; \n" // This will be passed into the fragment shader.
+ "void main() \n" // The entry point for our vertex shader.
+ "{ \n"
+ " v_Color = a_Color; \n" // Pass the color through to the fragment shader. It will be interpolated across the triangle.
+ " gl_Position = u_MVPMatrix \n" // gl_Position is a special variable used to store the final position.
+ " * a_Position; \n" // Multiply the vertex by the matrix to get the final point in normalized screen coordinates.
+ "} \n";
string fragmentShader =
"precision mediump float; \n" // Set the default precision to medium. We don't need as high of a
// precision in the fragment shader.
+ "varying vec4 v_Color; \n" // This is the color from the vertex shader interpolated across the triangle per fragment.
+ "void main() \n" // The entry point for our fragment shader.
+ "{ \n"
+ " gl_FragColor = v_Color; \n" // Pass the color directly through the pipeline.
+ "} \n";
int vertexShaderHandle = GLES20.GlCreateShader(GLES20.GlVertexShader);
if (vertexShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(vertexShaderHandle, vertexShader);
// Compile the shader.
GLES20.GlCompileShader(vertexShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(vertexShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(vertexShaderHandle);
vertexShaderHandle = 0;
}
}
if (vertexShaderHandle == 0)
{
throw new Exception("Error creating vertex shader.");
}
// Load in the fragment shader shader.
int fragmentShaderHandle = GLES20.GlCreateShader(GLES20.GlFragmentShader);
if (fragmentShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(fragmentShaderHandle, fragmentShader);
// Compile the shader.
GLES20.GlCompileShader(fragmentShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(fragmentShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(fragmentShaderHandle);
fragmentShaderHandle = 0;
}
}
if (fragmentShaderHandle == 0)
{
throw new Exception("Error creating fragment shader.");
}
// Create a program object and store the handle to it.
int programHandle = GLES20.GlCreateProgram();
if (programHandle != 0)
{
// Bind the vertex shader to the program.
GLES20.GlAttachShader(programHandle, vertexShaderHandle);
// Bind the fragment shader to the program.
GLES20.GlAttachShader(programHandle, fragmentShaderHandle);
// Bind attributes
GLES20.GlBindAttribLocation(programHandle, 0, "a_Position");
GLES20.GlBindAttribLocation(programHandle, 1, "a_Color");
// Link the two shaders together into a program.
GLES20.GlLinkProgram(programHandle);
// Get the link status.
int[] linkStatus = new int[1];
GLES20.GlGetProgramiv(programHandle, GLES20.GlLinkStatus, linkStatus, 0);
// If the link failed, delete the program.
if (linkStatus[0] == 0)
{
GLES20.GlDeleteProgram(programHandle);
programHandle = 0;
}
}
if (programHandle == 0)
{
throw new Exception("Error creating program.");
}
// Set program handles. These will later be used to pass in values to the program.
mMVPMatrixHandle = GLES20.GlGetUniformLocation(programHandle, "u_MVPMatrix");
mPositionHandle = GLES20.GlGetAttribLocation(programHandle, "a_Position");
mColorHandle = GLES20.GlGetAttribLocation(programHandle, "a_Color");
// Tell OpenGL to use this program when rendering.
GLES20.GlUseProgram(programHandle);
}
public void OnSurfaceCreated(IGL10 gl, Javax.Microedition.Khronos.Egl.EGLConfig config)
{
const float coord = 1.0f;
// Cube coords
// X, Y, Z = 1 vertex * 3 = 1 face * 12 = 1 cube
float[] triangleVerticesData =
{
-coord, -coord, -coord,
-coord, -coord, coord,
-coord, coord, coord,
coord, coord, -coord,
-coord, -coord, -coord,
-coord, coord, -coord,
coord, -coord, coord,
-coord, -coord, -coord,
coord, -coord, -coord,
coord, coord, -coord,
coord, -coord, -coord,
-coord, -coord, -coord,
-coord, -coord, -coord,
-coord, coord, coord,
-coord, coord, -coord,
coord, -coord, coord,
-coord, -coord, coord,
-coord, -coord, -coord,
-coord, coord, coord,
-coord, -coord, coord,
coord, -coord, coord,
coord, coord, coord,
coord, -coord, -coord,
coord, coord, -coord,
coord, -coord, -coord,
coord, coord, coord,
coord, -coord, coord,
coord, coord, coord,
coord, coord, -coord,
-coord, coord, -coord,
coord, coord, coord,
-coord, coord, -coord,
-coord, coord, coord,
coord, coord, coord,
-coord, coord, coord,
coord, -coord, coord
};
FloatBuffer mTriangleVertices = ByteBuffer.AllocateDirect(triangleVerticesData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleVertices.Put(triangleVerticesData).Flip();
// Cube colors
// R, G, B, A
float[] triangleColorsData =
{
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 1.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f
};
FloatBuffer mTriangleColors = ByteBuffer.AllocateDirect(triangleColorsData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleColors.Put(triangleColorsData).Flip();
//Cube texture UV Map
float[] triangleTextureUVMapData =
{
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f
};
FloatBuffer mTriangleTextureUVMap = ByteBuffer.AllocateDirect(triangleTextureUVMapData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleTextureUVMap.Put(triangleTextureUVMapData).Flip();
//triagles normals
//This normal array is not right, it is spacialy DO FOR demonstrate how normals work with faces when light is calculated at shader program
float[] triangleNormalData =
{
// Front face
0.0f, 0.0f, 1.0f,
0.0f, 0.0f, 1.0f,
0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
// Right face
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
// Back face
0.0f, 0.0f, -1.0f,
0.0f, 0.0f, -1.0f,
0.0f, 0.0f, -1.0f,
0.0f, 0.0f, -1.0f,
0.0f, 0.0f, -1.0f,
0.0f, 0.0f, -1.0f,
// Left face
-1.0f, 0.0f, 0.0f,
-1.0f, 0.0f, 0.0f,
-1.0f, 0.0f, 0.0f,
-1.0f, 0.0f, 0.0f,
-1.0f, 0.0f, 0.0f,
-1.0f, 0.0f, 0.0f,
// Top face
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
// Bottom face
0.0f, -1.0f, 0.0f,
0.0f, -1.0f, 0.0f,
0.0f, -1.0f, 0.0f,
0.0f, -1.0f, 0.0f,
0.0f, -1.0f, 0.0f,
0.0f, -1.0f, 0.0f
};
FloatBuffer mTriangleNormal = ByteBuffer.AllocateDirect(triangleNormalData.Length * mBytesPerFloat).Order(ByteOrder.NativeOrder()).AsFloatBuffer();
mTriangleNormal.Put(triangleNormalData).Flip();
//Data buffers to VBO
GLES20.GlGenBuffers(4, VBOBuffers, 0); //2 buffers for vertices, texture and colors
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[0]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleVertices.Capacity() * mBytesPerFloat, mTriangleVertices, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[1]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleColors.Capacity() * mBytesPerFloat, mTriangleColors, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[2]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleTextureUVMap.Capacity() * mBytesPerFloat, mTriangleTextureUVMap, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, VBOBuffers[3]);
GLES20.GlBufferData(GLES20.GlArrayBuffer, mTriangleNormal.Capacity() * mBytesPerFloat, mTriangleNormal, GLES20.GlStaticDraw);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, 0);
//Load and setup texture
GLES20.GlGenTextures(1, textureHandle, 0); //init 1 texture storage handle
if (textureHandle[0] != 0)
{
//Android.Graphics cose class Matrix exists at both Android.Graphics and Android.OpenGL and this is only sample of using
Android.Graphics.BitmapFactory.Options options = new Android.Graphics.BitmapFactory.Options();
options.InScaled = false; // No pre-scaling
Android.Graphics.Bitmap bitmap = Android.Graphics.BitmapFactory.DecodeResource(context.Resources, Resource.Drawable.texture1, options);
GLES20.GlBindTexture(GLES20.GlTexture2d, textureHandle[0]);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureMinFilter, GLES20.GlNearest);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureMagFilter, GLES20.GlNearest);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureWrapS, GLES20.GlClampToEdge);
GLES20.GlTexParameteri(GLES20.GlTexture2d, GLES20.GlTextureWrapT, GLES20.GlClampToEdge);
GLUtils.TexImage2D(GLES20.GlTexture2d, 0, bitmap, 0);
bitmap.Recycle();
}
//Ask android to run RAM garbage cleaner
System.GC.Collect();
//Setup OpenGL ES
GLES20.GlClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// GLES20.GlEnable(GLES20.GlDepthTest); //uncoment if needs enabled dpeth test
GLES20.GlEnable(2884); // GlCullFace == 2884 see OpenGL documentation to this constant value
GLES20.GlCullFace(GLES20.GlBack);
// Position the eye behind the origin.
float eyeX = 0.0f;
float eyeY = 0.0f;
float eyeZ = 4.5f;
// We are looking toward the distance
float lookX = 0.0f;
float lookY = 0.0f;
float lookZ = -5.0f;
// Set our up vector. This is where our head would be pointing were we holding the camera.
float upX = 0.0f;
float upY = coord;
float upZ = 0.0f;
// Set the view matrix. This matrix can be said to represent the camera position.
// NOTE: In OpenGL 1, a ModelView matrix is used, which is a combination of a model and
// view matrix. In OpenGL 2, we can keep track of these matrices separately if we choose.
Matrix.SetLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);
//all "attribute" variables is "triagles" VBO (arrays) items representation
//a_Possition[0] <=> a_Color[0] <=> a_TextureCoord[0] <=> a_Normal[0]
//a_Possition[1] <=> a_Color[1] <=> a_TextureCoord[1] <=> a_Normal[1]
//...
//a_Possition[n] <=> a_Color[n] <=> a_TextureCoord[n] <=> a_Normal[n] -- where "n" is object buffers length
//-> HOW MANY faces in your object (model) in VBO -> how many times the vertex shader will be called by OpenGL
string vertexShader =
"uniform mat4 u_MVPMatrix; \n" // A constant representing the combined model/view/projection matrix.
+ "uniform vec3 u_LightPos; \n" // A constant representing the light source position
+ "attribute vec4 a_Position; \n" // Per-vertex position information we will pass in. (it means vec4[x,y,z,w] but we put only x,y,z at this sample
+ "attribute vec4 a_Color; \n" // Per-vertex color information we will pass in.
+ "varying vec4 v_Color; \n" // This will be passed into the fragment shader.
+ "attribute vec2 a_TextureCoord; \n" // Per-vertex texture UVMap information we will pass in.
+ "varying vec2 v_TextureCoord; \n" // This will be passed into the fragment shader.
+ "attribute vec3 a_Normal; \n" // Per-vertex normals information we will pass in.
+ "void main() \n" // The entry point for our vertex shader.
+ "{ \n"
//light calculation section for fragment shader
+ " vec3 modelViewVertex = vec3(u_MVPMatrix * a_Position);\n"
+ " vec3 modelViewNormal = vec3(u_MVPMatrix * vec4(a_Normal, 0.0));\n"
+ " float distance = length(u_LightPos - modelViewVertex);\n"
+ " vec3 lightVector = normalize(u_LightPos - modelViewVertex);\n"
+ " float diffuse = max(dot(modelViewNormal, lightVector), 0.1);\n"
+ " diffuse = diffuse * (1.0 / (1.0 + (0.25 * distance * distance)));\n"
+ " v_Color = a_Color * vec4(diffuse);\n" //Pass the color with light aspect to fragment shader
+ " v_TextureCoord = a_TextureCoord; \n" // Pass the texture coordinate through to the fragment shader. It will be interpolated across the triangle.
+ " gl_Position = u_MVPMatrix \n" // gl_Position is a special variable used to store the final position.
+ " * a_Position; \n" // Multiply the vertex by the matrix to get the final point in normalized screen coordinates.
+ "} \n";
string fragmentShader =
"precision mediump float; \n" // Set the default precision to medium. We don't need as high of a
// precision in the fragment shader.
+ "varying vec4 v_Color; \n" // This is the color from the vertex shader interpolated across the triangle per fragment.
+ "varying vec2 v_TextureCoord; \n" // This is the texture coordinate from the vertex shader interpolated across the triangle per fragment.
+ "uniform sampler2D u_Texture; \n" // This is the texture image handler
+ "void main() \n" // The entry point for our fragment shader.
+ "{ \n"
+ " gl_FragColor = texture2D(u_Texture, v_TextureCoord) * v_Color; \n" // Pass the color directly through the pipeline.
+ "} \n";
int vertexShaderHandle = GLES20.GlCreateShader(GLES20.GlVertexShader);
if (vertexShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(vertexShaderHandle, vertexShader);
// Compile the shader.
GLES20.GlCompileShader(vertexShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(vertexShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(vertexShaderHandle);
vertexShaderHandle = 0;
}
}
if (vertexShaderHandle == 0)
{
throw new Exception("Error creating vertex shader.");
}
// Load in the fragment shader shader.
int fragmentShaderHandle = GLES20.GlCreateShader(GLES20.GlFragmentShader);
if (fragmentShaderHandle != 0)
{
// Pass in the shader source.
GLES20.GlShaderSource(fragmentShaderHandle, fragmentShader);
// Compile the shader.
GLES20.GlCompileShader(fragmentShaderHandle);
// Get the compilation status.
int[] compileStatus = new int[1];
GLES20.GlGetShaderiv(fragmentShaderHandle, GLES20.GlCompileStatus, compileStatus, 0);
// If the compilation failed, delete the shader.
if (compileStatus[0] == 0)
{
GLES20.GlDeleteShader(fragmentShaderHandle);
fragmentShaderHandle = 0;
}
}
if (fragmentShaderHandle == 0)
{
throw new Exception("Error creating fragment shader.");
}
// Create a program object and store the handle to it.
int programHandle = GLES20.GlCreateProgram();
if (programHandle != 0)
{
// Bind the vertex shader to the program.
GLES20.GlAttachShader(programHandle, vertexShaderHandle);
// Bind the fragment shader to the program.
GLES20.GlAttachShader(programHandle, fragmentShaderHandle);
// Bind attributes
GLES20.GlBindAttribLocation(programHandle, 0, "a_Position");
GLES20.GlBindAttribLocation(programHandle, 1, "a_Color");
GLES20.GlBindAttribLocation(programHandle, 2, "a_TextureCoord");
GLES20.GlBindAttribLocation(programHandle, 3, "a_Normal");
// Link the two shaders together into a program.
GLES20.GlLinkProgram(programHandle);
// Get the link status.
int[] linkStatus = new int[1];
GLES20.GlGetProgramiv(programHandle, GLES20.GlLinkStatus, linkStatus, 0);
// If the link failed, delete the program.
if (linkStatus[0] == 0)
{
GLES20.GlDeleteProgram(programHandle);
programHandle = 0;
}
}
if (programHandle == 0)
{
throw new Exception("Error creating program.");
}
// Set program handles. These will later be used to pass in values to the program.
mMVPMatrixHandle = GLES20.GlGetUniformLocation(programHandle, "u_MVPMatrix");
mLightPos = GLES20.GlGetUniformLocation(programHandle, "u_LightPos");
mPositionHandle = GLES20.GlGetAttribLocation(programHandle, "a_Position");
mColorHandle = GLES20.GlGetAttribLocation(programHandle, "a_Color");
mTextureCoordHandle = GLES20.GlGetAttribLocation(programHandle, "a_TextureCoord");
mNormalHandle = GLES20.GlGetAttribLocation(programHandle, "a_Normal");
mTextureHandle = GLES20.GlGetUniformLocation(programHandle, "u_Texture");
// Tell OpenGL to use this program when rendering.
GLES20.GlUseProgram(programHandle);
}
