public void Run()
{
try
{
// Load renderer
renderer = RenderSystem.Load("OpenGL", debugger);
// Create render context
var contextDesc = new RenderContextDescriptor();
{
contextDesc.VideoMode.Resolution.Width = 800;
contextDesc.VideoMode.Resolution.Height = 600;
contextDesc.VideoMode.ColorBits = 32;
contextDesc.VideoMode.DepthBits = 24;
contextDesc.VideoMode.StencilBits = 8;
}
context = renderer.CreateRenderContext(contextDesc);
// Get context window
var window = context.Surface;
window.Shown = true;
window.Title = $"LLGL for C# - Texturing ( {renderer.Name} )";
// Print renderer information
Console.WriteLine("Renderer Info:");
var info = renderer.Info;
{
Console.WriteLine($" Renderer: {info.RendererName}");
Console.WriteLine($" Device: {info.DeviceName}");
Console.WriteLine($" Vendor: {info.VendorName}");
Console.WriteLine($" Shading Language: {info.ShadingLanguageName}");
}
// Create vertex buffer
var vertexFormat = new VertexFormat();
vertexFormat.AppendAttribute(new VertexAttribute("coord", Format.RG32Float));
vertexFormat.AppendAttribute(new VertexAttribute("texCoord", Format.RG32Float));
const float uvScale = 10.0f;
var vertices = new Vertex[]
{
new Vertex(-0.5f, -0.5f, 0.0f, uvScale),
new Vertex(-0.5f, +0.5f, 0.0f, 0.0f),
new Vertex(+0.5f, -0.5f, uvScale, uvScale),
new Vertex(+0.5f, +0.5f, uvScale, 0.0f),
};
var vertexBufferDesc = new BufferDescriptor();
{
vertexBufferDesc.BindFlags = BindFlags.VertexBuffer;
vertexBufferDesc.Size = vertexFormat.Stride * (ulong)vertices.Length;
vertexBufferDesc.VertexBuffer.Format = vertexFormat;
}
var vertexBuffer = renderer.CreateBuffer(vertexBufferDesc, vertices);
// Create shaders
var vertShader = renderer.CreateShader(
new ShaderDescriptor(
type: ShaderType.Vertex,
sourceType: ShaderSourceType.CodeString,
source: @"
#version 330 core
in vec2 coord;
in vec2 texCoord;
out vec2 vTexCoord;
void main() {
gl_Position = vec4(coord, 0, 1);
vTexCoord = texCoord;
}
"
)
);
var fragShader = renderer.CreateShader(
new ShaderDescriptor
(
type: ShaderType.Fragment,
sourceType: ShaderSourceType.CodeString,
source: @"
#version 330 core
in vec2 vTexCoord;
out vec4 fColor;
uniform sampler2D tex;
void main() {
fColor = texture(tex, vTexCoord);
}
"
)
);
var shaderProgramDesc = new ShaderProgramDescriptor();
{
shaderProgramDesc.VertexFormats.Add(vertexFormat);
shaderProgramDesc.VertexShader = vertShader;
shaderProgramDesc.FragmentShader = fragShader;
}
var shaderProgram = renderer.CreateShaderProgram(shaderProgramDesc);
if (shaderProgram.HasErrors)
{
throw new Exception(shaderProgram.Report);
}
// Create pipeline layout
var pipelineLayoutDesc = new PipelineLayoutDescriptor();
{
pipelineLayoutDesc.Bindings.Add(
new BindingDescriptor(ResourceType.Texture, BindFlags.Sampled, StageFlags.FragmentStage, 0)
);
pipelineLayoutDesc.Bindings.Add(
new BindingDescriptor(ResourceType.Sampler, 0, StageFlags.FragmentStage, 0)
);
}
var pipelineLayout = renderer.CreatePipelineLayout(pipelineLayoutDesc);
// Create graphics pipeline
var pipelineDesc = new GraphicsPipelineDescriptor();
{
pipelineDesc.ShaderProgram = shaderProgram;
pipelineDesc.PipelineLayout = pipelineLayout;
pipelineDesc.PrimitiveTopology = PrimitiveTopology.TriangleStrip;
pipelineDesc.Blend.Targets[0].BlendEnabled = true;
}
pipeline = renderer.CreateGraphicsPipeline(pipelineDesc);
// Create texture
var imageDesc = new SrcImageDescriptor <RGBA>();
{
imageDesc.Format = ImageFormat.RGBA;
imageDesc.DataType = DataType.UInt8;
imageDesc.Data = new RGBA[4];
imageDesc.Data[0] = new RGBA(255, 0, 0, 255);
imageDesc.Data[1] = new RGBA(0, 255, 0, 255);
imageDesc.Data[2] = new RGBA(0, 0, 0, 0);
imageDesc.Data[3] = new RGBA(0, 0, 0, 0);
}
var textureDesc = new TextureDescriptor();
{
textureDesc.Type = TextureType.Texture2D;
textureDesc.Extent = new Extent3D(2, 2, 1);
}
var texture = renderer.CreateTexture(textureDesc, imageDesc);
// Create sampler
var samplerDesc = new SamplerDescriptor();
{
samplerDesc.MagFilter = SamplerFilter.Nearest;
}
var sampler = renderer.CreateSampler(samplerDesc);
// Create resource heap
var resourceHeapDesc = new ResourceHeapDescriptor();
{
resourceHeapDesc.PipelineLayout = pipelineLayout;
resourceHeapDesc.ResourceViews.Add(new ResourceViewDescriptor(texture));
resourceHeapDesc.ResourceViews.Add(new ResourceViewDescriptor(sampler));
}
var resourceHeap = renderer.CreateResourceHeap(resourceHeapDesc);
// Get command queue
cmdQueue = renderer.CommandQueue;
cmdBuffer = renderer.CreateCommandBuffer();
cmdBuffer.SetClearColor(0.1f, 0.1f, 0.2f, 1.0f);
// Render loop
while (window.ProcessEvents())
{
cmdBuffer.Begin();
{
cmdBuffer.SetVertexBuffer(vertexBuffer);
cmdBuffer.BeginRenderPass(context);
{
cmdBuffer.Clear(ClearFlags.Color);
cmdBuffer.SetViewport(new Viewport(0, 0, context.Resolution.Width, context.Resolution.Height));
cmdBuffer.SetGraphicsPipeline(pipeline);
cmdBuffer.SetGraphicsResourceHeap(resourceHeap);
cmdBuffer.Draw(4, 0);
}
cmdBuffer.EndRenderPass();
}
cmdBuffer.End();
cmdQueue.Submit(cmdBuffer);
context.Present();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Console.WriteLine("press any key to continue ...");
Console.ReadKey();
}
finally
{
RenderSystem.Unload(renderer);
}
}