Low level graphics API prerequisites (#319)

* Add GalPipelineState and IGalPipeline

* Separate UploadVertex call

* Add ConstBuffer cache

* Move Vertex Assembly into GalPipelineState

* Move Uniform binds to GalPipelineState

* Move framebuffer flip into a buffer

* Rebase

* Fix regression

* Move clear values from VertexEndGl to ClearBuffers

* Rename obscure names O->Old S->New

1 files changed, 379 insertions, 0 deletions

diff --git a/Ryujinx.Graphics/Gal/OpenGL/OGLPipeline.cs b/Ryujinx.Graphics/Gal/OpenGL/OGLPipeline.cs
new file mode 100644
index 00000000..54f984cd
--- /dev/null
+++ b/Ryujinx.Graphics/Gal/OpenGL/OGLPipeline.cs
@@ -0,0 +1,379 @@
+using OpenTK.Graphics.OpenGL;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Gal.OpenGL
+{
+    class OGLPipeline : IGalPipeline
+    {
+        private static Dictionary<GalVertexAttribSize, int> AttribElements =
+                   new Dictionary<GalVertexAttribSize, int>()
+        {
+            { GalVertexAttribSize._32_32_32_32, 4 },
+            { GalVertexAttribSize._32_32_32,    3 },
+            { GalVertexAttribSize._16_16_16_16, 4 },
+            { GalVertexAttribSize._32_32,       2 },
+            { GalVertexAttribSize._16_16_16,    3 },
+            { GalVertexAttribSize._8_8_8_8,     4 },
+            { GalVertexAttribSize._16_16,       2 },
+            { GalVertexAttribSize._32,          1 },
+            { GalVertexAttribSize._8_8_8,       3 },
+            { GalVertexAttribSize._8_8,         2 },
+            { GalVertexAttribSize._16,          1 },
+            { GalVertexAttribSize._8,           1 },
+            { GalVertexAttribSize._10_10_10_2,  4 },
+            { GalVertexAttribSize._11_11_10,    3 }
+        };
+
+        private static Dictionary<GalVertexAttribSize, VertexAttribPointerType> AttribTypes =
+                   new Dictionary<GalVertexAttribSize, VertexAttribPointerType>()
+        {
+            { GalVertexAttribSize._32_32_32_32, VertexAttribPointerType.Int   },
+            { GalVertexAttribSize._32_32_32,    VertexAttribPointerType.Int   },
+            { GalVertexAttribSize._16_16_16_16, VertexAttribPointerType.Short },
+            { GalVertexAttribSize._32_32,       VertexAttribPointerType.Int   },
+            { GalVertexAttribSize._16_16_16,    VertexAttribPointerType.Short },
+            { GalVertexAttribSize._8_8_8_8,     VertexAttribPointerType.Byte  },
+            { GalVertexAttribSize._16_16,       VertexAttribPointerType.Short },
+            { GalVertexAttribSize._32,          VertexAttribPointerType.Int   },
+            { GalVertexAttribSize._8_8_8,       VertexAttribPointerType.Byte  },
+            { GalVertexAttribSize._8_8,         VertexAttribPointerType.Byte  },
+            { GalVertexAttribSize._16,          VertexAttribPointerType.Short },
+            { GalVertexAttribSize._8,           VertexAttribPointerType.Byte  },
+            { GalVertexAttribSize._10_10_10_2,  VertexAttribPointerType.Int   }, //?
+            { GalVertexAttribSize._11_11_10,    VertexAttribPointerType.Int   }  //?
+        };
+
+        private GalPipelineState Old;
+
+        private OGLConstBuffer Buffer;
+        private OGLRasterizer Rasterizer;
+        private OGLShader Shader;
+
+        private int VaoHandle;
+
+        public OGLPipeline(OGLConstBuffer Buffer, OGLRasterizer Rasterizer, OGLShader Shader)
+        {
+            this.Buffer     = Buffer;
+            this.Rasterizer = Rasterizer;
+            this.Shader     = Shader;
+
+            //These values match OpenGL's defaults
+            Old = new GalPipelineState
+            {
+                FrontFace = GalFrontFace.CCW,
+
+                CullFaceEnabled = false,
+                CullFace = GalCullFace.Back,
+
+                DepthTestEnabled = false,
+                DepthFunc = GalComparisonOp.Less,
+
+                StencilTestEnabled = false,
+
+                StencilBackFuncFunc = GalComparisonOp.Always,
+                StencilBackFuncRef = 0,
+                StencilBackFuncMask = UInt32.MaxValue,
+                StencilBackOpFail = GalStencilOp.Keep,
+                StencilBackOpZFail = GalStencilOp.Keep,
+                StencilBackOpZPass = GalStencilOp.Keep,
+                StencilBackMask = UInt32.MaxValue,
+
+                StencilFrontFuncFunc = GalComparisonOp.Always,
+                StencilFrontFuncRef = 0,
+                StencilFrontFuncMask = UInt32.MaxValue,
+                StencilFrontOpFail = GalStencilOp.Keep,
+                StencilFrontOpZFail = GalStencilOp.Keep,
+                StencilFrontOpZPass = GalStencilOp.Keep,
+                StencilFrontMask = UInt32.MaxValue,
+
+                BlendEnabled = false,
+                BlendSeparateAlpha = false,
+
+                BlendEquationRgb = 0,
+                BlendFuncSrcRgb = GalBlendFactor.One,
+                BlendFuncDstRgb = GalBlendFactor.Zero,
+                BlendEquationAlpha = 0,
+                BlendFuncSrcAlpha = GalBlendFactor.One,
+                BlendFuncDstAlpha = GalBlendFactor.Zero,
+
+                PrimitiveRestartEnabled = false,
+                PrimitiveRestartIndex = 0
+            };
+        }
+
+        public void Bind(GalPipelineState New)
+        {
+            BindConstBuffers(New);
+
+            BindVertexLayout(New);
+
+            if (New.FlipX != Old.FlipX || New.FlipY != Old.FlipY)
+            {
+                Shader.SetFlip(New.FlipX, New.FlipY);
+            }
+
+            //Note: Uncomment SetFrontFace and SetCullFace when flipping issues are solved
+
+            //if (New.FrontFace != O.FrontFace)
+            //{
+            //    GL.FrontFace(OGLEnumConverter.GetFrontFace(New.FrontFace));
+            //}
+
+            //if (New.CullFaceEnabled != O.CullFaceEnabled)
+            //{
+            //    Enable(EnableCap.CullFace, New.CullFaceEnabled);
+            //}
+
+            //if (New.CullFaceEnabled)
+            //{
+            //    if (New.CullFace != O.CullFace)
+            //    {
+            //        GL.CullFace(OGLEnumConverter.GetCullFace(New.CullFace));
+            //    }
+            //}
+
+            if (New.DepthTestEnabled != Old.DepthTestEnabled)
+            {
+                Enable(EnableCap.DepthTest, New.DepthTestEnabled);
+            }
+
+            if (New.DepthTestEnabled)
+            {
+                if (New.DepthFunc != Old.DepthFunc)
+                {
+                    GL.DepthFunc(OGLEnumConverter.GetDepthFunc(New.DepthFunc));
+                }
+            }
+
+            if (New.StencilTestEnabled != Old.StencilTestEnabled)
+            {
+                Enable(EnableCap.StencilTest, New.StencilTestEnabled);
+            }
+
+            if (New.StencilTestEnabled)
+            {
+                if (New.StencilBackFuncFunc != Old.StencilBackFuncFunc ||
+                    New.StencilBackFuncRef  != Old.StencilBackFuncRef  ||
+                    New.StencilBackFuncMask != Old.StencilBackFuncMask)
+                {
+                    GL.StencilFuncSeparate(
+                        StencilFace.Back,
+                        OGLEnumConverter.GetStencilFunc(New.StencilBackFuncFunc),
+                        New.StencilBackFuncRef,
+                        New.StencilBackFuncMask);
+                }
+
+                if (New.StencilBackOpFail  != Old.StencilBackOpFail  ||
+                    New.StencilBackOpZFail != Old.StencilBackOpZFail ||
+                    New.StencilBackOpZPass != Old.StencilBackOpZPass)
+                {
+                    GL.StencilOpSeparate(
+                        StencilFace.Back,
+                        OGLEnumConverter.GetStencilOp(New.StencilBackOpFail),
+                        OGLEnumConverter.GetStencilOp(New.StencilBackOpZFail),
+                        OGLEnumConverter.GetStencilOp(New.StencilBackOpZPass));
+                }
+
+                if (New.StencilBackMask != Old.StencilBackMask)
+                {
+                    GL.StencilMaskSeparate(StencilFace.Back, New.StencilBackMask);
+                }
+
+                if (New.StencilFrontFuncFunc != Old.StencilFrontFuncFunc ||
+                    New.StencilFrontFuncRef  != Old.StencilFrontFuncRef  ||
+                    New.StencilFrontFuncMask != Old.StencilFrontFuncMask)
+                {
+                    GL.StencilFuncSeparate(
+                        StencilFace.Front,
+                        OGLEnumConverter.GetStencilFunc(New.StencilFrontFuncFunc),
+                        New.StencilFrontFuncRef,
+                        New.StencilFrontFuncMask);
+                }
+
+                if (New.StencilFrontOpFail  != Old.StencilFrontOpFail  ||
+                    New.StencilFrontOpZFail != Old.StencilFrontOpZFail ||
+                    New.StencilFrontOpZPass != Old.StencilFrontOpZPass)
+                {
+                    GL.StencilOpSeparate(
+                        StencilFace.Front,
+                        OGLEnumConverter.GetStencilOp(New.StencilFrontOpFail),
+                        OGLEnumConverter.GetStencilOp(New.StencilFrontOpZFail),
+                        OGLEnumConverter.GetStencilOp(New.StencilFrontOpZPass));
+                }
+
+                if (New.StencilFrontMask != Old.StencilFrontMask)
+                {
+                    GL.StencilMaskSeparate(StencilFace.Front, New.StencilFrontMask);
+                }
+            }
+
+            if (New.BlendEnabled != Old.BlendEnabled)
+            {
+                Enable(EnableCap.Blend, New.BlendEnabled);
+            }
+
+            if (New.BlendEnabled)
+            {
+                if (New.BlendSeparateAlpha)
+                {
+                    if (New.BlendEquationRgb   != Old.BlendEquationRgb ||
+                        New.BlendEquationAlpha != Old.BlendEquationAlpha)
+                    {
+                        GL.BlendEquationSeparate(
+                            OGLEnumConverter.GetBlendEquation(New.BlendEquationRgb),
+                            OGLEnumConverter.GetBlendEquation(New.BlendEquationAlpha));
+                    }
+
+                    if (New.BlendFuncSrcRgb   != Old.BlendFuncSrcRgb   ||
+                        New.BlendFuncDstRgb   != Old.BlendFuncDstRgb   ||
+                        New.BlendFuncSrcAlpha != Old.BlendFuncSrcAlpha ||
+                        New.BlendFuncDstAlpha != Old.BlendFuncDstAlpha)
+                    {
+                        GL.BlendFuncSeparate(
+                            (BlendingFactorSrc) OGLEnumConverter.GetBlendFactor(New.BlendFuncSrcRgb),
+                            (BlendingFactorDest)OGLEnumConverter.GetBlendFactor(New.BlendFuncDstRgb),
+                            (BlendingFactorSrc) OGLEnumConverter.GetBlendFactor(New.BlendFuncSrcAlpha),
+                            (BlendingFactorDest)OGLEnumConverter.GetBlendFactor(New.BlendFuncDstAlpha));
+                    }
+                }
+                else
+                {
+                    if (New.BlendEquationRgb != Old.BlendEquationRgb)
+                    {
+                        GL.BlendEquation(OGLEnumConverter.GetBlendEquation(New.BlendEquationRgb));
+                    }
+
+                    if (New.BlendFuncSrcRgb != Old.BlendFuncSrcRgb ||
+                        New.BlendFuncDstRgb != Old.BlendFuncDstRgb)
+                    {
+                        GL.BlendFunc(
+                            OGLEnumConverter.GetBlendFactor(New.BlendFuncSrcRgb),
+                            OGLEnumConverter.GetBlendFactor(New.BlendFuncDstRgb));
+                    }
+                }
+            }
+
+            if (New.PrimitiveRestartEnabled != Old.PrimitiveRestartEnabled)
+            {
+                Enable(EnableCap.PrimitiveRestart, New.PrimitiveRestartEnabled);
+            }
+
+            if (New.PrimitiveRestartEnabled)
+            {
+                if (New.PrimitiveRestartIndex != Old.PrimitiveRestartIndex)
+                {
+                    GL.PrimitiveRestartIndex(New.PrimitiveRestartIndex);
+                }
+            }
+
+            Old = New;
+        }
+
+        private void BindConstBuffers(GalPipelineState New)
+        {
+            //Index 0 is reserved
+            int FreeBinding = 1;
+
+            void BindIfNotNull(OGLShaderStage Stage)
+            {
+                if (Stage != null)
+                {
+                    foreach (ShaderDeclInfo DeclInfo in Stage.UniformUsage)
+                    {
+                        long Key = New.ConstBufferKeys[(int)Stage.Type][DeclInfo.Cbuf];
+
+                        if (Key != 0 && Buffer.TryGetUbo(Key, out int UboHandle))
+                        {
+                            GL.BindBufferBase(BufferRangeTarget.UniformBuffer, FreeBinding, UboHandle);
+                        }
+
+                        FreeBinding++;
+                    }
+                }
+            }
+
+            BindIfNotNull(Shader.Current.Vertex);
+            BindIfNotNull(Shader.Current.TessControl);
+            BindIfNotNull(Shader.Current.TessEvaluation);
+            BindIfNotNull(Shader.Current.Geometry);
+            BindIfNotNull(Shader.Current.Fragment);
+        }
+
+        private void BindVertexLayout(GalPipelineState New)
+        {
+            foreach (GalVertexBinding Binding in New.VertexBindings)
+            {
+                if (!Binding.Enabled || !Rasterizer.TryGetVbo(Binding.VboKey, out int VboHandle))
+                {
+                    continue;
+                }
+
+                if (VaoHandle == 0)
+                {
+                    VaoHandle = GL.GenVertexArray();
+
+                    //Vertex arrays shouldn't be used anywhere else in OpenGL's backend
+                    //if you want to use it, move this line out of the if
+                    GL.BindVertexArray(VaoHandle);
+                }
+
+                foreach (GalVertexAttrib Attrib in Binding.Attribs)
+                {
+                    GL.EnableVertexAttribArray(Attrib.Index);
+
+                    GL.BindBuffer(BufferTarget.ArrayBuffer, VboHandle);
+
+                    bool Unsigned =
+                        Attrib.Type == GalVertexAttribType.Unorm ||
+                        Attrib.Type == GalVertexAttribType.Uint ||
+                        Attrib.Type == GalVertexAttribType.Uscaled;
+
+                    bool Normalize =
+                        Attrib.Type == GalVertexAttribType.Snorm ||
+                        Attrib.Type == GalVertexAttribType.Unorm;
+
+                    VertexAttribPointerType Type = 0;
+
+                    if (Attrib.Type == GalVertexAttribType.Float)
+                    {
+                        Type = VertexAttribPointerType.Float;
+                    }
+                    else
+                    {
+                        Type = AttribTypes[Attrib.Size] + (Unsigned ? 1 : 0);
+                    }
+
+                    int Size = AttribElements[Attrib.Size];
+                    int Offset = Attrib.Offset;
+
+                    if (Attrib.Type == GalVertexAttribType.Sint ||
+                        Attrib.Type == GalVertexAttribType.Uint)
+                    {
+                        IntPtr Pointer = new IntPtr(Offset);
+
+                        VertexAttribIntegerType IType = (VertexAttribIntegerType)Type;
+
+                        GL.VertexAttribIPointer(Attrib.Index, Size, IType, Binding.Stride, Pointer);
+                    }
+                    else
+                    {
+                        GL.VertexAttribPointer(Attrib.Index, Size, Type, Normalize, Binding.Stride, Offset);
+                    }
+                }
+            }
+        }
+
+        private void Enable(EnableCap Cap, bool Enabled)
+        {
+            if (Enabled)
+            {
+                GL.Enable(Cap);
+            }
+            else
+            {
+                GL.Disable(Cap);
+            }
+        }
+    }
+}
\ No newline at end of file