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Introduction to CgFX: Enhanced Graphics Programming with NVIDIA

CgFX is a powerful framework designed for developing advanced graphical effects using NVIDIA's Cg shading language. It allows for an efficient production pipeline by supporting Microsoft .fx files and providing tools for integration with popular DCC applications like 3ds MAX, Maya, and XSI. With features like multi-pass rendering, hardware fallbacks, and intuitive artist controls, CgFX simplifies the creation and application of effects in real-time graphics. This overview covers its runtime, tools, and the production pipeline essential for modern graphic development.

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Introduction to CgFX: Enhanced Graphics Programming with NVIDIA

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  1. CgFX Sébastien Dominé, NVIDIA

  2. Overview • What is CgFX? • CgFX runtime • Production pipeline with CgFX • CgFX Tools set • Demo

  3. What is CgFX? • Supports Microsoft .fx files • Cg plus: • Multi-pass • Hardware fallbacks (techniques) • Complete Hardware states • Tweakables • MS .fx plus: • DirectX8 and OpenGL • MAC and Linux

  4. CgFX overview

  5. .fx file float4x4 worldMatrix : World; // World or model matrix float4x4 mvpMatrix : WorldViewProjection; // Model * View * Projection float4x4 worldViewMatrix : WorldView; // World * View texture diffuseTexture : DiffuseMap// Diffuse Map semantic < string File = "default_color.dds"; // Default texture file annotation >; texture normalMap : NormalMap// Normal Map semantic < string File = "default_bump_normal.dds"; // Default texture file annotation >; float4 ambientColor : Ambient < > = {0.1, 0.1, 0.1, 1.0}; float bumpHeight < // GUI annotations string gui = "slider"; float min = 0; float max = 1; float step = 0.1; > = 0.5;

  6. .fx file void DiffuseBumpVS( float4 Position : POSITION,// Position in object space float2 TexCoord : TEXCOORD0, // Texture coordinates … out float4 TexCoord0 : TEXCOORD0, // Texture coordinates out float4 Position : POSITION)// Position in projection space { TexCoord0.xy = IN.TexCoord.xy; // Pass texture coordinates for the diffuse map … Position = mul(WorldViewProj, IN.Position); // Compute position in projection space } void DiffuseBumpPS( float4 Position : POSITION, // Position in projection space … out float4 col : COLOR) { float4 color = tex2D(DiffuseMap, UV); // Look up the diffuse map … col = color * light; // Modulate the diffuse color by the light }

  7. .fx file sampler2D diffuseSampler = sampler_state { Texture = <diffuseTexture>; MinFilter = Linear; MagFilter = Linear; MipFilter = Linear; }; sampler2D normalSampler = sampler_state { Texture = <normalMap>; MinFilter = Linear; MagFilter = Linear; MipFilter = Linear; }; technique CgTechnique // Both the vertex and the fragment shaders are in Cg { pass p0 { ZEnable = true; ZWriteEnable = true; CullMode = None; VertexShader = compile vs_1_1 DiffuseBumpVS(mvpMatrix, WorldIMatrix, lightPos); PixelShader = compile ps_1_1 DiffuseBumpPS(diffuseSampler, normalSampler, bumpHeight); } pass p1 { ... } }

  8. CgFX Runtime • Currently at Beta 3 • Final release will be fully compatible with DX9 D3DXEffects • Simple API enables creation of effects from .fx files • Compiled into efficient state-blocks • Can then enumerate techniques, parameters, semantics, etc. • Typical render loop: pEffect->Begin(&numPasses,0); for (PassNum = 0; PassNum < numPasses; ++PassNum) { pEffect->Pass(PassNum); pDevice->DrawPrimitive(NVPRIMITIVE_TRIANGLELIST, StartVertex, mesh.num_faces); } pEffect->End();

  9. Production Pipeline with CgFX

  10. CgFX Tools Set • Integrated authoring in DCC apps: • 3ds MAX 5.1 • MAYA 4.5 • XSI (CgFX Coming soon...) • NVB Exporter • CgFX Viewer • OpenGL ARB, DirectX8, DirectX9

  11. 3ds max 5.1 • stdmaterial <-> CgFX • Height maps to normal maps • Ability to select MAX scene lights and connect them to .fx parameters • On the fly editing of shaders and auto-update of .fx GUI • MAXSCRIPT support • Source Code

  12. Dynamic Shader specific GUI Supports .fx shader format Support native Maya attributes to render .fx tweakables Samples include: Bumpy Shiny, Toon, Anisotropic Metal, Ghostly, Refraction Dispersion, Rainbow Integrated with Maya’s lights Intuitive artist controls Slider control over key real-time parameters (e.g., bump depth) CgFX integrated with Maya’s hypershade – node based shader editor Source Code Maya 4.5

  13. NVB Exporter for 3ds max • Based on Pierre Terdiman’s 3ds max exporter • http://www.codercorner.com/Flexporter.htm • Exports Scene data • Mesh, materials, lights, camera, skinning, etc... • Exports CgFX materials • ICgFXDataBridge interface • Source code

  14. CgFX Viewer • Scene graph GUI • .fx parameters edition • Error reporting for easy .fx file problem identification • Runs OpenGL, DirectX8, DirectX9 • Switch between devices at any point

  15. Demos

  16. Questions? • Sébastien Dominé sdomine@nvidia.com cgsupport@nvidia.com

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