private void SetVertexAttributes(OpenGLVertexInputLayout inputlayout, VertexBuffer[] vertexBuffers)
{
int totalSlotsBound = 0;
for (int i = 0; i < inputlayout.VBLayoutsBySlot.Length; i++)
{
OpenGLVertexInput input = inputlayout.VBLayoutsBySlot[i];
OpenGLVertexBuffer vb = ((OpenGLVertexBuffer)vertexBuffers[i]);
vb.Apply();
for (int slot = 0; slot < input.Elements.Length; slot++)
{
ref OpenGLVertexInputElement element = ref input.Elements[slot]; // Large structure -- use by reference.
int actualSlot = totalSlotsBound + slot;
if (actualSlot >= _vertexAttributesBound)
{
GL.EnableVertexAttribArray(actualSlot);
}
GL.VertexAttribPointer(actualSlot, element.ElementCount, element.Type, element.Normalized, vb.Stride, element.Offset);
int stepRate = element.InstanceStepRate;
if (_vertexAttribDivisors[actualSlot] != stepRate)
{
GL.VertexAttribDivisor(actualSlot, stepRate);
_vertexAttribDivisors[actualSlot] = stepRate;
}
}
totalSlotsBound += input.Elements.Length;
}
public OpenGLShaderSet(
OpenGLVertexInputLayout inputLayout,
OpenGLShader vertexShader,
OpenGLShader tessellationControlShader,
OpenGLShader tessellationEvaluationShader,
OpenGLShader geometryShader,
OpenGLShader fragmentShader)
{
InputLayout = inputLayout;
VertexShader = vertexShader;
TessellationControlShader = tessellationControlShader;
TessellationEvaluationShader = tessellationEvaluationShader;
GeometryShader = geometryShader;
FragmentShader = fragmentShader;
ProgramID = GL.CreateProgram();
GL.AttachShader(ProgramID, vertexShader.ShaderID);
if (tessellationControlShader != null)
{
GL.AttachShader(ProgramID, tessellationControlShader.ShaderID);
}
if (tessellationEvaluationShader != null)
{
GL.AttachShader(ProgramID, tessellationEvaluationShader.ShaderID);
}
if (geometryShader != null)
{
GL.AttachShader(ProgramID, geometryShader.ShaderID);
}
GL.AttachShader(ProgramID, fragmentShader.ShaderID);
int slot = 0;
foreach (var input in inputLayout.InputDescriptions)
{
for (int i = 0; i < input.Elements.Length; i++)
{
GL.BindAttribLocation(ProgramID, slot, input.Elements[i].Name);
slot += 1;
}
}
GL.LinkProgram(ProgramID);
int linkStatus;
GL.GetProgram(ProgramID, GetProgramParameterName.LinkStatus, out linkStatus);
if (linkStatus != 1)
{
string log = GL.GetProgramInfoLog(ProgramID);
throw new VeldridException($"Error linking GL program: {log}");
}
}
public OpenGLShaderSet(
OpenGLVertexInputLayout inputLayout,
OpenGLShader vertexShader,
OpenGLShader tessellationControlShader,
OpenGLShader tessellationEvaluationShader,
OpenGLShader geometryShader,
OpenGLShader fragmentShader)
{
InputLayout = inputLayout;
VertexShader = vertexShader;
TessellationControlShader = tessellationControlShader;
TessellationEvaluationShader = tessellationEvaluationShader;
GeometryShader = geometryShader;
FragmentShader = fragmentShader;
ProgramID = GL.CreateProgram();
GL.AttachShader(ProgramID, vertexShader.ShaderID);
if (tessellationControlShader != null)
{
GL.AttachShader(ProgramID, tessellationControlShader.ShaderID);
}
if (tessellationEvaluationShader != null)
{
GL.AttachShader(ProgramID, tessellationEvaluationShader.ShaderID);
}
if (geometryShader != null)
{
GL.AttachShader(ProgramID, geometryShader.ShaderID);
}
GL.AttachShader(ProgramID, fragmentShader.ShaderID);
int slot = 0;
foreach (VertexInputDescription input in inputLayout.InputDescriptions)
{
for (int i = 0; i < input.Elements.Length; i++)
{
GL.BindAttribLocation(ProgramID, slot, input.Elements[i].Name);
slot += 1;
}
}
GL.LinkProgram(ProgramID);
#if DEBUG && GL_VALIDATE_VERTEX_INPUT_ELEMENTS
slot = 0;
foreach (VertexInputDescription input in inputLayout.InputDescriptions)
{
for (int i = 0; i < input.Elements.Length; i++)
{
int location = GL.GetAttribLocation(ProgramID, input.Elements[i].Name);
if (location == -1)
{
throw new VeldridException("There was no attribute variable with the name " + input.Elements[i].Name);
}
slot += 1;
}
}
#endif
int linkStatus;
GL.GetProgram(ProgramID, GetProgramParameterName.LinkStatus, out linkStatus);
if (linkStatus != 1)
{
string log = GL.GetProgramInfoLog(ProgramID);
throw new VeldridException($"Error linking GL program: {log}");
}
}