• <ins id="pjuwb"></ins>
    <blockquote id="pjuwb"><pre id="pjuwb"></pre></blockquote>
    <noscript id="pjuwb"></noscript>
          <sup id="pjuwb"><pre id="pjuwb"></pre></sup>
            <dd id="pjuwb"></dd>
            <abbr id="pjuwb"></abbr>

            天行健 君子當自強而不息

            D3D Animation Basis(4)

            Loading Vertex Shaders

            Moving on in the list of helper functions, you'll find load_vertex_shader. You'll use this function to help you load your vertex shaders, as well as prepare your vertex shader declarations.

            The actual code to the load_vertex_shader function is short, so instead of breaking it up to explain it, I'll give it to you all at once.

            HRESULT load_vertex_shader(IDirect3DVertexShader9** ret_vertex_shader,
                                       IDirect3DDevice9
            * device,
                                       
            const char* filename,
                                       
            const D3DVERTEXELEMENT9* vertex_elements,
                                       IDirect3DVertexDeclaration9
            ** ret_vertex_decl)
            {
                
            // error checking
                if(ret_vertex_shader == NULL || device == NULL || filename == NULL)
                    
            return E_FAIL;

                
            // load and assemble the shader
                ID3DXBuffer* shader_buffer;
                HRESULT hr 
            = D3DXAssembleShaderFromFile(filename, NULL, NULL, 0&shader_buffer, NULL);

                
            if(FAILED(hr))
                    
            return hr;

                hr 
            = device->CreateVertexShader((DWORD*) shader_buffer->GetBufferPointer(), ret_vertex_shader);

                
            if(FAILED(hr))
                    
            return hr;

                shader_buffer
            ->Release();

                
            // create the declaration interface if needed
                if(vertex_elements && ret_vertex_decl)
                    device
            ->CreateVertexDeclaration(vertex_elements, ret_vertex_decl);

                
            return S_OK;
            }

             

            After first checking to make sure the parameters you have passed to the load_vertex_shader function are valid, execution continues by loading and assembling the vertex shader via a call to D3DXAssembleShaderFromFile.

            Assemble a shader.

            HRESULT D3DXAssembleShaderFromFile(
            LPCTSTR pSrcFile,
            CONST D3DXMACRO* pDefines,
            LPD3DXINCLUDE pInclude,
            DWORD Flags,
            LPD3DXBUFFER* ppShader,
            LPD3DXBUFFER * ppErrorMsgs
            );

            Parameters

            pSrcFile
            [in] Pointer to a string that specifies the filename. If the compiler settings require Unicode, the data type LPCTSTR resolves to LPCWSTR. Otherwise, the string data type resolves to LPCSTR. See Remarks.
            pDefines
            [in] An optional NULL terminated array of D3DXMACRO structures. This value may be NULL.
            pInclude
            [in] Optional interface pointer, ID3DXInclude, to use for handling #include directives. If this value is NULL, #includes will either be honored when compiling from a file or will cause an error when compiled from a resource or memory.
            Flags
            [in] Compile options identified by various flags. The Direct3D 10 HLSL compiler is now the default. See D3DXSHADER Flags for details.
            ppShader
            [out] Returns a buffer containing the created shader. This buffer contains the compiled shader code, as well as any embedded debug and symbol table information.
            ppErrorMsgs
            [out] Returns a buffer containing a listing of errors and warnings that were encountered during the compile. These are the same messages the debugger displays when running in debug mode. This value may be NULL.

            Return Values

            If the function succeeds, the return value is D3D_OK. If the function fails, the return value can be one of the following: D3DERR_INVALIDCALL, D3DXERR_INVALIDDATA, E_OUTOFMEMORY.

            Remarks

            The compiler setting also determines the function version. If Unicode is defined, the function call resolves to D3DXAssembleShaderFromFileW. Otherwise, the function call resolves to D3DXAssembleShaderFromFileA because ANSI strings are being used.

            Using the D3DXBUFFER object returned from that function call, you then use the IDirect3DDevice::CreateVertexShader function to create your vertex shader object.

            Finishing up load_vertex_shader, you'll see the call to CreateVertexDeclaration, which you use to create an IDirect3DVertexDeclaration9 interface from the supplied array of vertex elements (vertex_elements in the load_vertex_shader prototype). The vertex declaration object pointer is then stored in the ret_vertex_decl pointer you provide.

            To use load_vertex_shader, pass it a pointer to an IDirect3DVertexShader9 object you want to create, along with a valid IDirect3DDevice9 object and file name of the vertex shader file. The last two parameters (vertex_elements and ret_vertex_decl) are optional. By passing a valid D3DVERTEXELEMENT9 array and the IDirect3DVertexDeclaration9 object pointer, you can prepare your vertex declarations for use with the vertex shader being loaded.

            Let us see the define of D3DVERTEXELEMENT9:

            Defines the vertex data layout. Each vertex can contain one or more data types, and each data type is described by a vertex element.

            typedef struct D3DVERTEXELEMENT9 {
            WORD Stream;
            WORD Offset;
            BYTE Type;
            BYTE Method;
            BYTE Usage;
            BYTE UsageIndex;
            } D3DVERTEXELEMENT9, *LPD3DVERTEXELEMENT9;

            Members

            Stream
            Stream number.
            Offset
            Offset from the beginning of the vertex data to the data associated with the particular data type.
            Type
            The data type, specified as a D3DDECLTYPE. One of several predefined types that define the data size. Some methods have an implied type.
            Method
            The method specifies the tessellator processing, which determines how the tessellator interprets (or operates on) the vertex data. For more information, see D3DDECLMETHOD.
            Usage
            Defines what the data will be used for; that is, the interoperability between vertex data layouts and vertex shaders. Each usage acts to bind a vertex declaration to a vertex shader. In some cases, they have a special interpretation. For example, an element that specifies D3DDECLUSAGE_NORMAL or D3DDECLUSAGE_POSITION is used by the N-patch tessellator to set up tessellation. See D3DDECLUSAGE for a list of the available semantics. D3DDECLUSAGE_TEXCOORD can be used for user-defined fields (which don't have an existing usage defined).
            UsageIndex
            Modifies the usage data to allow the user to specify multiple usage types.

            Remarks

            Vertex data is defined using an array of D3DVERTEXELEMENT9 structures. Use D3DDECL_END to declare the last element in the declaration.

            Defines a vertex declaration data type.

            typedef enum D3DDECLTYPE
            {
            D3DDECLTYPE_FLOAT1 = 0,
            D3DDECLTYPE_FLOAT2 = 1,
            D3DDECLTYPE_FLOAT3 = 2,
            D3DDECLTYPE_FLOAT4 = 3,
            D3DDECLTYPE_D3DCOLOR = 4,
            D3DDECLTYPE_UBYTE4 = 5,
            D3DDECLTYPE_SHORT2 = 6,
            D3DDECLTYPE_SHORT4 = 7,
            D3DDECLTYPE_UBYTE4N = 8,
            D3DDECLTYPE_SHORT2N = 9,
            D3DDECLTYPE_SHORT4N = 10,
            D3DDECLTYPE_USHORT2N = 11,
            D3DDECLTYPE_USHORT4N = 12,
            D3DDECLTYPE_UDEC3 = 13,
            D3DDECLTYPE_DEC3N = 14,
            D3DDECLTYPE_FLOAT16_2 = 15,
            D3DDECLTYPE_FLOAT16_4 = 16,
            D3DDECLTYPE_UNUSED = 17,
            } D3DDECLTYPE, *LPD3DDECLTYPE;

            Constants

            D3DDECLTYPE_FLOAT1
            One-component float expanded to (float, 0, 0, 1).
            D3DDECLTYPE_FLOAT2
            Two-component float expanded to (float, float, 0, 1).
            D3DDECLTYPE_FLOAT3
            Three-component float expanded to (float, float, float, 1).
            D3DDECLTYPE_FLOAT4
            Four-component float expanded to (float, float, float, float).
            D3DDECLTYPE_D3DCOLOR
            Four-component, packed, unsigned bytes mapped to 0 to 1 range. Input is a D3DCOLOR and is expanded to RGBA order.
            D3DDECLTYPE_UBYTE4
            Four-component, unsigned byte.
            D3DDECLTYPE_SHORT2
            Two-component, signed short expanded to (value, value, 0, 1).
            D3DDECLTYPE_SHORT4
            Four-component, signed short expanded to (value, value, value, value).
            D3DDECLTYPE_UBYTE4N
            Four-component byte with each byte normalized by dividing with 255.0f.
            D3DDECLTYPE_SHORT2N
            Normalized, two-component, signed short, expanded to (first short/32767.0, second short/32767.0, 0, 1).
            D3DDECLTYPE_SHORT4N
            Normalized, four-component, signed short, expanded to (first short/32767.0, second short/32767.0, third short/32767.0, fourth short/32767.0).
            D3DDECLTYPE_USHORT2N
            Normalized, two-component, unsigned short, expanded to (first short/65535.0, short short/65535.0, 0, 1).
            D3DDECLTYPE_USHORT4N
            Normalized, four-component, unsigned short, expanded to (first short/65535.0, second short/65535.0, third short/65535.0, fourth short/65535.0).
            D3DDECLTYPE_UDEC3
            Three-component, unsigned, 10 10 10 format expanded to (value, value, value, 1).
            D3DDECLTYPE_DEC3N
            Three-component, signed, 10 10 10 format normalized and expanded to (v[0]/511.0, v[1]/511.0, v[2]/511.0, 1).
            D3DDECLTYPE_FLOAT16_2
            Two-component, 16-bit, floating point expanded to (value, value, 0, 1).
            D3DDECLTYPE_FLOAT16_4
            Four-component, 16-bit, floating point expanded to (value, value, value, value).
            D3DDECLTYPE_UNUSED
            Type field in the declaration is unused. This is designed for use with D3DDECLMETHOD_UV and D3DDECLMETHOD_LOOKUPPRESAMPLED.

            Remarks

            Vertex data is declared with an array of D3DVERTEXELEMENT9 structures. Each element in the array contains a vertex declaration data type.

            Use the DirectX Caps Viewer Tool tool to see which types are supported on your device.

            Identifies the intended use of vertex data.

            typedef enum D3DDECLUSAGE
            {
            D3DDECLUSAGE_POSITION = 0,
            D3DDECLUSAGE_BLENDWEIGHT = 1,
            D3DDECLUSAGE_BLENDINDICES = 2,
            D3DDECLUSAGE_NORMAL = 3,
            D3DDECLUSAGE_PSIZE = 4,
            D3DDECLUSAGE_TEXCOORD = 5,
            D3DDECLUSAGE_TANGENT = 6,
            D3DDECLUSAGE_BINORMAL = 7,
            D3DDECLUSAGE_TESSFACTOR = 8,
            D3DDECLUSAGE_POSITIONT = 9,
            D3DDECLUSAGE_COLOR = 10,
            D3DDECLUSAGE_FOG = 11,
            D3DDECLUSAGE_DEPTH = 12,
            D3DDECLUSAGE_SAMPLE = 13,
            } D3DDECLUSAGE, *LPD3DDECLUSAGE;

            Constants

            D3DDECLUSAGE_POSITION
            Position data ranging from (-1,-1) to (1,1). Use D3DDECLUSAGE_POSITION with a usage index of 0 to specify untransformed position for fixed function vertex processing and the n-patch tessellator. Use D3DDECLUSAGE_POSITION with a usage index of 1 to specify untransformed position in the fixed function vertex shader for vertex tweening.
            D3DDECLUSAGE_BLENDWEIGHT
            Blending weight data. Use D3DDECLUSAGE_BLENDWEIGHT with a usage index of 0 to specify the blend weights used in indexed and nonindexed vertex blending.
            D3DDECLUSAGE_BLENDINDICES
            Blending indices data. Use D3DDECLUSAGE_BLENDINDICES with a usage index of 0 to specify matrix indices for indexed paletted skinning.
            D3DDECLUSAGE_NORMAL
            Vertex normal data. Use D3DDECLUSAGE_NORMAL with a usage index of 0 to specify vertex normals for fixed function vertex processing and the n-patch tessellator. Use D3DDECLUSAGE_NORMAL with a usage index of 1 to specify vertex normals for fixed function vertex processing for vertex tweening.
            D3DDECLUSAGE_PSIZE
            Point size data. Use D3DDECLUSAGE_PSIZE with a usage index of 0 to specify the point-size attribute used by the setup engine of the rasterizer to expand a point into a quad for the point-sprite functionality.
            D3DDECLUSAGE_TEXCOORD
            Texture coordinate data. Use D3DDECLUSAGE_TEXCOORD, n to specify texture coordinates in fixed function vertex processing and in pixel shaders prior to ps_3_0. These can be used to pass user defined data.
            D3DDECLUSAGE_TANGENT
            Vertex tangent data.
            D3DDECLUSAGE_BINORMAL
            Vertex binormal data.
            D3DDECLUSAGE_TESSFACTOR
            Single positive floating point value. Use D3DDECLUSAGE_TESSFACTOR with a usage index of 0 to specify a tessellation factor used in the tessellation unit to control the rate of tessellation. For more information about the data type, see D3DDECLTYPE_FLOAT1.
            D3DDECLUSAGE_POSITIONT
            Vertex data contains transformed position data ranging from (0,0) to (viewport width, viewport height). Use D3DDECLUSAGE_POSITIONT with a usage index of 0 to specify transformed position. When a declaration containing this is set, the pipeline does not perform vertex processing.
            D3DDECLUSAGE_COLOR
            Vertex data contains diffuse or specular color. Use D3DDECLUSAGE_COLOR with a usage index of 0 to specify the diffuse color in the fixed function vertex shader and pixel shaders prior to ps_3_0. Use D3DDECLUSAGE_COLOR with a usage index of 1 to specify the specular color in the fixed function vertex shader and pixel shaders prior to ps_3_0.
            D3DDECLUSAGE_FOG
            Vertex data contains fog data. Use D3DDECLUSAGE_FOG with a usage index of 0 to specify a fog blend value used after pixel shading finishes. This applies to pixel shaders prior to version ps_3_0.
            D3DDECLUSAGE_DEPTH
            Vertex data contains depth data.
            D3DDECLUSAGE_SAMPLE
            Vertex data contains sampler data. Use D3DDECLUSAGE_SAMPLE with a usage index of 0 to specify the displacement value to look up. It can be used only with D3DDECLUSAGE_LOOKUPPRESAMPLED or D3DDECLUSAGE_LOOKUP.

            Remarks

            Vertex data is declared with an array of D3DVERTEXELEMENT9 structures. Each element in the array contains a usage type.

            For more information about vertex declarations, see Vertex Declaration (Direct3D 9).

            Here's a small example of using load_vertex_shader. First, I declare an array of vertex elements that are used to create the vertex declaration object.

            // Declare the vertex shader declaration elements
            D3DVERTEXELEMENT9 Elements[] =
            {
            { 0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0 },
            { 0, 12, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_NORMAL, 0 },
            { 0, 24, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0 },
            D3DDECL_END()
            };

            Then I instance the vertex shader and vertex declaration objects and call load_vertex_shader.

            // Instance objects
            IDirect3DVertexShader9 *pShader = NULL;
            IDirect3DVertexDeclaration9 *pDecl = NULL;

            // Load the vertex shader and create declaration interface
            load_vertex_shader(&pShader, pDevice, "Shader.vsh", &Elements, &pDecl);

            As you can see, it's a quick and simple function that gets the job done. From here on out, you can set the vertex shader (represented by pShader) using the IDirect3DDevice9::SetVertexShader function. To set the vertex declaration (represented by pDecl), you would call IDirect3DDevice9::SetVertexDeclaration.

            pD3DDevice−>SetFVF(NULL); // Clear FVF usages
            pD3DDevice−>SetVertexShader(pShader);
            pD3DDevice−>SetVertexDeclaration(pDecl);

            Okay, enough of initializing and loading vertex shaders, let's move on to the cool stuff, like loading and rendering meshes.


            posted on 2008-04-14 13:39 lovedday 閱讀(1381) 評論(0)  編輯 收藏 引用

            公告

            導航

            統計

            常用鏈接

            隨筆分類(178)

            3D游戲編程相關鏈接

            搜索

            最新評論

            久久国产亚洲精品无码| 欧洲性大片xxxxx久久久| 亚洲精品乱码久久久久久蜜桃图片| 亚洲国产香蕉人人爽成AV片久久| 亚洲伊人久久成综合人影院| 久久久久久久久久久精品尤物| 色综合久久久久无码专区| 久久国产热精品波多野结衣AV| 国产成人精品久久一区二区三区| 99久久亚洲综合精品网站| 亚洲AV伊人久久青青草原| 久久久噜噜噜久久中文福利| 99久久精品无码一区二区毛片| 怡红院日本一道日本久久 | 亚洲精品无码久久毛片| 中文字幕久久精品无码| 国产精品99久久久久久www| 777午夜精品久久av蜜臀 | 青青热久久国产久精品 | 天天爽天天爽天天片a久久网| 亚洲综合久久久| 国产精品久久久天天影视香蕉| 无码专区久久综合久中文字幕| 久久精品一区二区三区中文字幕 | 久久99精品国产麻豆婷婷| 69国产成人综合久久精品| 久久只有这精品99| 久久久久国产| 久久99精品久久久久久齐齐| 99久久er这里只有精品18| 人妻久久久一区二区三区| 一本久久综合亚洲鲁鲁五月天| 91久久精品国产免费直播| 久久亚洲综合色一区二区三区| 97久久超碰成人精品网站| 久久精品国产亚洲AV麻豆网站| 久久精品一区二区三区AV| 精品久久人人爽天天玩人人妻| 久久久久久久91精品免费观看 | 97久久久精品综合88久久| 久久久国产乱子伦精品作者|