public void Draw()
{
Gles.glEnable(Gles.GL_DEPTH_TEST);
Gles.glClearColor(0, 0, 0.4f, 1);
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT);
if (mProgram == 0)
{
return;
}
Gles.glUseProgram(mProgram);
Gles.glThrowError();
if (UseBufferMethod)
{
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexPositionBuffer);
Gles.glThrowError();
Gles.glVertexAttribPointer((GLuint)mPositionAttribLocation, 3, Gles.GL_FLOAT, Gles.GL_FALSE, 0, IntPtr.Zero);
Gles.glThrowError();
}
else
{
Gles.glVertexAttribPointer((GLuint)mPositionAttribLocation, 3, Gles.GL_FLOAT, Gles.GL_FALSE, 0, mVertexPositions);
Gles.glThrowError();
}
Gles.glEnableVertexAttribArray((GLuint)mPositionAttribLocation);
Gles.glThrowError();
Gles.glDrawArrays(Gles.GL_TRIANGLES, 0, 3);
Gles.glThrowError();
}
public SimpleRenderer()
{
mWindowWidth = 0;
mWindowHeight = 0;
string vs =
@"attribute vec4 aPosition;
void main() {
gl_Position = aPosition;
}";
string fs =
@"precision mediump float;
void main() {
gl_FragColor = vec4(1, 0, 0, 1);
}";
mProgram = CompileProgram(vs, fs);
mPositionAttribLocation = Gles.glGetAttribLocation(mProgram, "aPosition");
if (UseBufferMethod)
{
Gles.glGenBuffers(1, out mVertexPositionBuffer);
Gles.glThrowError();
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexPositionBuffer);
Gles.glThrowError();
Gles.glBufferData(Gles.GL_ARRAY_BUFFER, mVertexPositions, Gles.GL_STATIC_DRAW);
Gles.glThrowError();
}
}
public void Draw()
{
Gles.glEnable(Gles.GL_DEPTH_TEST);
Gles.glClear(Gles.GL_COLOR_BUFFER_BIT | Gles.GL_DEPTH_BUFFER_BIT);
if (mProgram == 0)
{
return;
}
Gles.glUseProgram(mProgram);
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexPositionBuffer);
Gles.glEnableVertexAttribArray((GLuint)mPositionAttribLocation);
Gles.glVertexAttribPointer((GLuint)mPositionAttribLocation, 3, Gles.GL_FLOAT, Gles.GL_FALSE, 0, IntPtr.Zero);
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexColorBuffer);
Gles.glEnableVertexAttribArray((GLuint)mColorAttribLocation);
Gles.glVertexAttribPointer((GLuint)mColorAttribLocation, 3, Gles.GL_FLOAT, Gles.GL_FALSE, 0, IntPtr.Zero);
float[,] modelMatrix = MathHelpers.SimpleModelMatrix((float)mDrawCount / 50.0f);
Gles.glUniformMatrix4fv(mModelUniformLocation, 1, Gles.GL_FALSE, modelMatrix);
float[,] viewMatrix = MathHelpers.SimpleViewMatrix();
Gles.glUniformMatrix4fv(mViewUniformLocation, 1, Gles.GL_FALSE, viewMatrix);
float[,] projectionMatrix = MathHelpers.SimpleProjectionMatrix((float)mWindowWidth / (float)mWindowHeight);
Gles.glUniformMatrix4fv(mProjUniformLocation, 1, Gles.GL_FALSE, projectionMatrix);
// Draw 36 indices: six faces, two triangles per face, 3 indices per triangle
Gles.glBindBuffer(Gles.GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
Gles.glDrawElements(Gles.GL_TRIANGLES, (6 * 2) * 3, Gles.GL_UNSIGNED_SHORT, IntPtr.Zero);
mDrawCount += 1;
}
public SimpleRenderer()
{
mWindowWidth = 0;
mWindowHeight = 0;
mDrawCount = 0;
// Vertex Shader source
string vs =
@"uniform mat4 uModelMatrix;
uniform mat4 uViewMatrix;
uniform mat4 uProjMatrix;
attribute vec4 aPosition;
attribute vec4 aColor;
varying vec4 vColor;
void main()
{
gl_Position = uProjMatrix * uViewMatrix * uModelMatrix * aPosition;
vColor = aColor;
}";
// Fragment Shader source
string fs =
@"precision mediump float;
varying vec4 vColor;
void main()
{
gl_FragColor = vColor;
}";
// Set up the shader and its uniform/attribute locations.
mProgram = CompileProgram(vs, fs);
mPositionAttribLocation = Gles.glGetAttribLocation(mProgram, "aPosition");
mColorAttribLocation = Gles.glGetAttribLocation(mProgram, "aColor");
mModelUniformLocation = Gles.glGetUniformLocation(mProgram, "uModelMatrix");
mViewUniformLocation = Gles.glGetUniformLocation(mProgram, "uViewMatrix");
mProjUniformLocation = Gles.glGetUniformLocation(mProgram, "uProjMatrix");
// Then set up the cube geometry.
GLfloat[] vertexPositions = new[]
{
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
};
Gles.glGenBuffers(1, out mVertexPositionBuffer);
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexPositionBuffer);
Gles.glBufferData(Gles.GL_ARRAY_BUFFER, vertexPositions, Gles.GL_STATIC_DRAW);
GLfloat[] vertexColors = new[]
{
0.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 1.0f,
};
Gles.glGenBuffers(1, out mVertexColorBuffer);
Gles.glBindBuffer(Gles.GL_ARRAY_BUFFER, mVertexColorBuffer);
Gles.glBufferData(Gles.GL_ARRAY_BUFFER, vertexColors, Gles.GL_STATIC_DRAW);
GLshort[] indices = new GLshort[]
{
0, 1, 2, // -x
1, 3, 2,
4, 6, 5, // +x
5, 6, 7,
0, 5, 1, // -y
0, 4, 5,
2, 7, 6, // +y
2, 3, 7,
0, 6, 4, // -z
0, 2, 6,
1, 7, 3, // +z
1, 5, 7,
};
Gles.glGenBuffers(1, out mIndexBuffer);
Gles.glBindBuffer(Gles.GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
Gles.glBufferData(Gles.GL_ELEMENT_ARRAY_BUFFER, indices, Gles.GL_STATIC_DRAW);
}
