public Shader(string[] vs, string[] fs)
{
if (!compile(ref verterxId_, ShaderType.VertexShader, vs))
{
Console.WriteLine("ERROR: while compiling vertex shader");
}
if (!compile(ref fragmentId_, ShaderType.FragmentShader, fs))
{
Console.WriteLine("ERROR: while compiling fragment shader");
}
programId_ = Gl.CreateProgram();
Gl.AttachShader(programId_, verterxId_);
Gl.AttachShader(programId_, fragmentId_);
Gl.BindAttribLocation(programId_, ATTRIB_VERTICES_POS, "in_vertex");
Gl.LinkProgram(programId_);
int errorlk = 0;
Gl.GetProgram(programId_, ProgramProperty.LinkStatus, out errorlk);
if (errorlk != Gl.TRUE)
{
Console.WriteLine("ERROR: while linking Shader :");
int errorSize = 0;
Gl.GetProgram(programId_, ProgramProperty.InfoLogLength, out errorSize);
StringBuilder error = new StringBuilder(1024);
Gl.GetShaderInfoLog(programId_, errorSize, out errorSize, error);
Console.WriteLine(error.ToString());
error.Clear();
Gl.DeleteProgram(programId_);
}
}
/// <summary>
/// Create a shader program by linking compiled shaders.
/// </summary>
/// <param name="vertShader">The vert shader to attach.</param>
/// <param name="fragShader">The frag shader to attach.</param>
/// <returns></returns>
public static ShaderProgram CreateFromShaders(uint vertShader, uint fragShader)
{
Debug.Assert(GLThread.IsGLThread());
uint pointer = Gl.CreateProgram();
Gl.AttachShader(pointer, vertShader);
Gl.AttachShader(pointer, fragShader);
// Set default parameter locations.
Gl.BindAttribLocation(pointer, VertexLocation, "vertPos");
Gl.BindAttribLocation(pointer, UvLocation, "uv");
Gl.BindAttribLocation(pointer, ColorLocation, "color");
Gl.LinkProgram(pointer);
if (Engine.Configuration.GlDebugMode)
{
Gl.ValidateProgram(pointer);
}
// Check linking status.
var programCompileStatusReader = new StringBuilder(1024);
Gl.GetProgramInfoLog(pointer, 1024, out int length, programCompileStatusReader);
if (length > 0)
{
var programStatus = programCompileStatusReader.ToString(0, length);
if (programStatus != "")
{
Engine.Log.Warning($"Log for linking shaders (v:{vertShader} f:{fragShader}) is {programStatus}", MessageSource.GL);
}
}
var valid = false;
Gl.GetProgram(pointer, ProgramProperty.LinkStatus, out int state);
if (state == 0)
{
Engine.Log.Warning($"Couldn't link shader program {pointer}.", MessageSource.GL);
}
else
{
valid = true;
}
var newProgram = new ShaderProgram
{
Pointer = pointer,
Valid = valid
};
return(newProgram);
}
public ShaderProgram(uint vertShader, uint fragShader)
{
Pointer = Gl.CreateProgram();
Gl.AttachShader(Pointer, vertShader);
Gl.AttachShader(Pointer, fragShader);
// Set default parameter locations.
Gl.BindAttribLocation(Pointer, VertexLocation, "vertPos");
Gl.BindAttribLocation(Pointer, UvLocation, "uv");
Gl.BindAttribLocation(Pointer, TidLocation, "tid");
Gl.BindAttribLocation(Pointer, ColorLocation, "color");
Gl.LinkProgram(Pointer);
// Check linking status.
var programCompileStatusReader = new StringBuilder(1024);
Gl.GetProgramInfoLog(Pointer, 1024, out int length, programCompileStatusReader);
if (length > 0)
{
var programStatus = programCompileStatusReader.ToString(0, length);
if (programStatus != "")
{
Engine.Log.Warning($"Log for linking shader {Pointer} is {programStatus}", MessageSource.GL);
}
}
Gl.GetProgram(Pointer, ProgramProperty.LinkStatus, out int state);
if (state == 0)
{
Engine.Log.Warning($"Couldn't link shader program {Pointer}.", MessageSource.GL);
}
else
{
Valid = true;
}
if (!Valid)
{
return;
}
// Set default uniforms - this requires binding, so save the currently bound.
uint previouslyBound = Bound;
EnsureBound(Pointer);
SetUniformIntArray("textures", Enumerable.Range(0, Engine.Renderer.TextureArrayLimit).ToArray());
SetUniformFloat("iTime", 0);
EnsureBound(previouslyBound);
}
internal GlShaderProgram(uint vertPointer, uint fragPointer)
{
try
{
_uniformLocationsMap = new Dictionary <string, uint>();
// Create and link the program with the vert and fragment shaders.
Id = Gl.CreateProgram();
Gl.AttachShader(Id, vertPointer);
Gl.AttachShader(Id, fragPointer);
Gl.BindAttribLocation(Id, Engine.GraphicsManager.VertexLocation, "vertPos");
Gl.BindAttribLocation(Id, Engine.GraphicsManager.UvLocation, "uv");
Gl.BindAttribLocation(Id, Engine.GraphicsManager.TidLocation, "tid");
Gl.BindAttribLocation(Id, Engine.GraphicsManager.ColorLocation, "color");
Engine.GraphicsManager.CheckError("setting locations");
Gl.LinkProgram(Id);
Gl.GetProgram(Id, ProgramProperty.LinkStatus, out int state);
if (state == 0)
{
Engine.Log.Warning($"Couldn't link shader - {vertPointer} / {fragPointer}.", MessageSource.GL);
Broken = true;
}
// Check linking status.
StringBuilder compileStatusReader = new StringBuilder(1024);
Gl.GetProgramInfoLog(Id, 1024, out int length, compileStatusReader);
string programStatus = compileStatusReader.ToString(0, length);
if (programStatus != "")
{
Engine.Log.Warning($"Log for linking shader {Id} is {programStatus}", MessageSource.GL);
}
Gl.DetachShader(Id, vertPointer);
Gl.DetachShader(Id, fragPointer);
Gl.ValidateProgram(Id);
Engine.GraphicsManager.CheckError("making program and shaders");
}
catch (Exception ex)
{
ErrorHandler.SubmitError(ex);
}
}
protected void bindAttribute(uint attribute, string variableName)
{
Gl.BindAttribLocation(programID, attribute, variableName);
}
public void Initialize(uint[] indices, string shader)
{
VertexArray = Gl.GenVertexArray();
Gl.BindVertexArray(VertexArray);
// Allocate a vertex buffer that is big enough to hold 'MaxVerticies' number of vertices.
// The draw hint 'DynamicDraw' indicades, that the data may be changed every frame.
VertexBuffer = Gl.GenBuffer();
Gl.BindBuffer(BufferTarget.ArrayBuffer, VertexBuffer);
Gl.BufferData(BufferTarget.ArrayBuffer, (uint)(Renderer.MaxVerticies * Marshal.SizeOf <Vertex>()), IntPtr.Zero, BufferUsage.DynamicDraw);
Gl.EnableVertexAttribArray(0);
// The vertex position is a 4-component vector that is not normalized.
Gl.VertexAttribPointer(0, 4, VertexAttribType.Float, false, Marshal.SizeOf <Vertex>(), Marshal.OffsetOf <Vertex>("Position"));
Gl.EnableVertexAttribArray(1);
// The vertex color is a 4-component vector that is normalized.
Gl.VertexAttribPointer(1, 4, VertexAttribType.Float, true, Marshal.SizeOf <Vertex>(), Marshal.OffsetOf <Vertex>("Color"));
Gl.EnableVertexAttribArray(2);
// The vertex texture coordinates is a 2-component vector that is not normalized.
Gl.VertexAttribPointer(2, 2, VertexAttribType.Float, false, Marshal.SizeOf <Vertex>(), Marshal.OffsetOf <Vertex>("TexCoord"));
Gl.EnableVertexAttribArray(3);
// The vertex texture index is a 1-component vector that is not normalized.
Gl.VertexAttribPointer(3, 1, VertexAttribType.Float, false, Marshal.SizeOf <Vertex>(), Marshal.OffsetOf <Vertex>("TexIndex"));
// Allocate an index buffer that is big enough to hold 'MaxIndices' number of indices.
// The draw hint 'StaticDraw' indicades, that the data will not be changed.
IndexBuffer = Gl.GenBuffer();
Gl.BindBuffer(BufferTarget.ElementArrayBuffer, IndexBuffer);
Gl.BufferData(BufferTarget.ElementArrayBuffer, (uint)(indices.Length * sizeof(uint)), indices, BufferUsage.StaticDraw);
// Load the shader source.
string shaderText = File.ReadAllText(shader);
// The shader source is split into a vertex shader and a fragment shader via preprocessor statements.
string vertexShaderText = "#version " + ShaderVersion + "\n#define VS_BUILD\n" + shaderText;
string fragmentShaderText = "#version " + ShaderVersion + "\n#define FS_BUILD\n" + shaderText;
// Create a new shader program and compile the vertex shader and fragment shader.
ShaderProgram = Gl.CreateProgram();
VertexShader = CompileShader(ShaderType.VertexShader, vertexShaderText);
FragmentShader = CompileShader(ShaderType.FragmentShader, fragmentShaderText);
// Attach the shaders to the program and link.
Gl.AttachShader(ShaderProgram, VertexShader);
Gl.AttachShader(ShaderProgram, FragmentShader);
Gl.LinkProgram(ShaderProgram);
Gl.ValidateProgram(ShaderProgram);
Gl.UseProgram(ShaderProgram);
// Find and bind the attribute locations.
Gl.GetProgram(ShaderProgram, ProgramProperty.ActiveAttributes, out int numActiveAttribs);
Gl.GetProgram(ShaderProgram, ProgramProperty.ActiveAttributeMaxLength, out int maxAttribNameLength);
StringBuilder nameData = new StringBuilder(maxAttribNameLength);
for (uint attrib = 0; attrib < numActiveAttribs; attrib++)
{
Gl.GetActiveAttrib(ShaderProgram, attrib, nameData.Capacity, out _, out _, out _, nameData);
Gl.BindAttribLocation(ShaderProgram, attrib, nameData.ToString());
}
// Query the uniform locations.
Gl.GetProgram(ShaderProgram, ProgramProperty.ActiveUniforms, out int numActiveUniforms);
Gl.GetProgram(ShaderProgram, ProgramProperty.ActiveUniformMaxLength, out int maxUniformNameLength);
Uniforms = new Dictionary <string, int>();
nameData = new StringBuilder(maxUniformNameLength);
for (uint uniform = 0, samplerCount = 0; uniform < numActiveUniforms; uniform++)
{
Gl.GetActiveUniform(ShaderProgram, uniform, nameData.Capacity, out _, out int arraySize, out int type, nameData);
string uniformName = nameData.ToString();
if (arraySize > 1)
{
uniformName = uniformName.Substring(0, uniformName.IndexOf("["));
}
for (int i = 0; i < arraySize; i++)
{
string name = arraySize == 1 ? uniformName : uniformName + "[" + i + "]";
int location = Gl.GetUniformLocation(ShaderProgram, name);
Uniforms[name] = location;
// Additionally bind the sampler2D uniforms to the OpenGL texture slots in order of appearence.
if (type == Gl.SAMPLER_2D)
{
Gl.Uniform1(location, (int)(samplerCount++));
}
}
}
}
