public void DrawPrimitives(PrimitiveType primitiveType, int vertexStart, int primitiveCount)
{
// Flush the GL state before moving on!
ApplyState();
// Set up the vertex buffers.
for (int i = 0; i < vertexBufferCount; i += 1)
{
GLDevice.BindVertexBuffer(
vertexBufferBindings[i].VertexBuffer.Handle
);
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.Apply(
VertexShader,
(IntPtr)(
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.VertexStride *
vertexBufferBindings[i].VertexOffset
)
);
}
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Draw!
GLDevice.glDrawArrays(
PrimitiveTypeGL(primitiveType),
vertexStart,
GetElementCountArray(primitiveType, primitiveCount)
);
}
public void DrawUserPrimitives <T>(
PrimitiveType primitiveType,
T[] vertexData,
int vertexOffset,
int primitiveCount,
VertexDeclaration vertexDeclaration
) where T : struct
{
// Flush the GL state before moving on!
ApplyState();
// Unbind current VBOs.
GLDevice.BindVertexBuffer(OpenGLDevice.OpenGLVertexBuffer.NullBuffer);
// Pin the buffers.
GCHandle vbHandle = GCHandle.Alloc(vertexData, GCHandleType.Pinned);
// Setup the vertex declaration to point at the VB data.
vertexDeclaration.GraphicsDevice = this;
vertexDeclaration.Apply(VertexShader, vbHandle.AddrOfPinnedObject());
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Draw!
GLDevice.glDrawArrays(
PrimitiveTypeGL(primitiveType),
vertexOffset,
GetElementCountArray(primitiveType, primitiveCount)
);
// Release the handles.
vbHandle.Free();
}
public void DrawInstancedPrimitives(
PrimitiveType primitiveType,
int baseVertex,
int minVertexIndex,
int numVertices,
int startIndex,
int primitiveCount,
int instanceCount
)
{
// Note that minVertexIndex and numVertices are NOT used!
// If this device doesn't have the support, just explode now before it's too late.
if (!GLDevice.SupportsHardwareInstancing)
{
throw new NoSuitableGraphicsDeviceException("Your hardware does not support hardware instancing!");
}
// Flush the GL state before moving on!
ApplyState();
// Unsigned short or unsigned int?
bool shortIndices = Indices.IndexElementSize == IndexElementSize.SixteenBits;
// Set up the vertex buffers.
for (int i = 0; i < vertexBufferCount; i += 1)
{
GLDevice.BindVertexBuffer(
vertexBufferBindings[i].VertexBuffer.Handle
);
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.Apply(
VertexShader,
(IntPtr)(
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.VertexStride *
(vertexBufferBindings[i].VertexOffset + baseVertex)
),
vertexBufferBindings[i].InstanceFrequency
);
}
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Bind the index buffer
GLDevice.BindIndexBuffer(Indices.Handle);
// Draw!
GLDevice.glDrawElementsInstanced(
PrimitiveTypeGL(primitiveType),
GetElementCountArray(primitiveType, primitiveCount),
shortIndices ?
OpenGLDevice.GLenum.GL_UNSIGNED_SHORT :
OpenGLDevice.GLenum.GL_UNSIGNED_INT,
(IntPtr)(startIndex * (shortIndices ? 2 : 4)),
instanceCount
);
}
/// <summary>
/// Draw geometry by indexing into the vertex buffer.
/// </summary>
/// <param name="primitiveType">The type of primitives in the index buffer.</param>
/// <param name="baseVertex">
/// Used to offset the vertex range indexed from the vertex buffer.
/// </param>
/// <param name="minVertexIndex">
/// A hint of the lowest vertex indexed relative to baseVertex.
/// </param>
/// <param name="numVertices">An hint of the maximum vertex indexed.</param>
/// <param name="startIndex">
/// The index within the index buffer to start drawing from.
/// </param>
/// <param name="primitiveCount">
/// The number of primitives to render from the index buffer.
/// </param>
/// <remarks>
/// Note that minVertexIndex and numVertices are unused in MonoGame and will be ignored.
/// </remarks>
public void DrawIndexedPrimitives(
PrimitiveType primitiveType,
int baseVertex,
int minVertexIndex,
int numVertices,
int startIndex,
int primitiveCount
)
{
// Flush the GL state before moving on!
ApplyState();
// Unsigned short or unsigned int?
bool shortIndices = Indices.IndexElementSize == IndexElementSize.SixteenBits;
// Set up the vertex buffers.
for (int i = 0; i < vertexBufferCount; i += 1)
{
GLDevice.BindVertexBuffer(
vertexBufferBindings[i].VertexBuffer.Handle
);
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.Apply(
VertexShader,
(IntPtr)(
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.VertexStride *
(vertexBufferBindings[i].VertexOffset + baseVertex)
)
);
}
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Bind the index buffer
GLDevice.BindIndexBuffer(Indices.Handle);
// Draw!
GLDevice.glDrawRangeElements(
PrimitiveTypeGL(primitiveType),
minVertexIndex,
minVertexIndex + numVertices - 1,
GetElementCountArray(primitiveType, primitiveCount),
shortIndices ?
OpenGLDevice.GLenum.GL_UNSIGNED_SHORT :
OpenGLDevice.GLenum.GL_UNSIGNED_INT,
(IntPtr)(startIndex * (shortIndices ? 2 : 4))
);
}
public void DrawUserIndexedPrimitives <T>(
PrimitiveType primitiveType,
T[] vertexData,
int vertexOffset,
int numVertices,
int[] indexData,
int indexOffset,
int primitiveCount,
VertexDeclaration vertexDeclaration
) where T : struct, IVertexType
{
// Flush the GL state before moving on!
ApplyState();
// Unbind current buffer objects.
GLDevice.BindVertexBuffer(OpenGLDevice.OpenGLVertexBuffer.NullBuffer);
GLDevice.BindIndexBuffer(OpenGLDevice.OpenGLIndexBuffer.NullBuffer);
// Pin the buffers.
GCHandle vbHandle = GCHandle.Alloc(vertexData, GCHandleType.Pinned);
GCHandle ibHandle = GCHandle.Alloc(indexData, GCHandleType.Pinned);
// Setup the vertex declaration to point at the VB data.
vertexDeclaration.GraphicsDevice = this;
vertexDeclaration.Apply(
VertexShader,
(IntPtr)(vbHandle.AddrOfPinnedObject().ToInt64() + vertexDeclaration.VertexStride * vertexOffset)
);
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Draw!
GLDevice.glDrawRangeElements(
PrimitiveTypeGL(primitiveType),
0,
numVertices - 1,
GetElementCountArray(primitiveType, primitiveCount),
OpenGLDevice.GLenum.GL_UNSIGNED_INT,
(IntPtr)(ibHandle.AddrOfPinnedObject().ToInt64() + (indexOffset * sizeof(int)))
);
// Release the handles.
ibHandle.Free();
vbHandle.Free();
}
