13.Shader

来源：互联网发布：多空资金指标公式源码编辑：程序博客网时间：2024/05/01 22:58

终于到了Shader部分，不过书中只有vertex shader和pixel shader，呃。而且书中是以CG为例子的，不过都差不多。

写Shader需要在.material中先定义shader。

fragment_program MyFragmentShader1 cg{source Ogre3DBeginnersGuideShaders.cgentry_point MyFragmentShader1profiles ps_1_1 arbfp1}vertex_program MyVertexShader1 cg{source Ogre3DBeginnersGuideShaders.cgentry_point MyVertexShader1profiles vs_1_1 arbvp1default_params{param_named_auto worldViewMatrix worldviewproj_matrix}}material MyMaterial13{technique{pass{vertex_program_ref MyVertexShader1{}fragment_program_ref MyFragmentShader1{}}}}

然后要再创建一个.cg文件，写入shader函数。

void MyVertexShader1(float4 position : POSITION,out float4 oPosition : POSITION,uniform float4x4 worldViewMatrix){oPosition = mul(worldViewMatrix, position);}void MyFragmentShader1(out float4 color : COLOR){color = float4(1, 0, 1, 0);}

大概的格式与步骤就是这样了，要是用就直接使用这个材质。

下面再贴一个复杂一点的，使用了纹理，并且实时改变了顶点位置。

fragment_program MyFragmentShader2 cg{source Ogre3DBeginnersGuideShaders.cgentry_point MyFragmentShader2profiles ps_1_1 arbfp1}vertex_program MyVertexShader5 cg{source Ogre3DBeginnersGuideShaders.cgentry_point MyVertexShader5profiles vs_1_1 arbvp1default_params{param_named_auto worldViewMatrix worldviewproj_matrixparam_named_auto pulseTime time}}material MyMaterial17{technique{pass{vertex_program_ref MyVertexShader5{}fragment_program_ref MyFragmentShader2{}texture_unit{texture terr_rock6.jpg}}}}

对应的CG文件

void MyFragmentShader2(float2 uv : TEXCOORD0,out float4 color : COLOR,uniform sampler2D texture){color = tex2D(texture, uv);}void MyVertexShader5(uniform float pulseTime,float4 position : POSITION,out float4 oPosition : POSITION,float2 uv : TEXCOORD0,out float2 oUv : TEXCOORD0,uniform float4x4 worldViewMatrix){oPosition = mul(worldViewMatrix, position);oPosition.x *= (2 + sin(pulseTime));oUv = uv;}