Two Methods of Multitexture In Cg

最新推荐文章于 2023-12-25 00:48:35 发布

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博客介绍了两种实现多纹理支持的方法。方法一是利用OpenGL原生多纹理支持，通过C++和Cg文件设置纹理参数；方法二则是使用Cg的特殊纹理函数，同样在C++和Cg文件中进行纹理参数的设置、启用和禁用等操作。

Method 1: Using OpenGL's native multi-texture support (using semantics)

// In C++ File:

   // Identify the textures to use for the pixel shader...
    cgGLSetTextureParameter( g_CGparam_testTexture, g_testTextureID );
    cgGLSetTextureParameter( g_CGparam_checkerTexture, g_checkerTextureID );

    // STAGE 0
    glActiveTextureARB( GL_TEXTURE0_ARB );
    glBindTexture( GL_TEXTURE_2D, g_testTextureID );

    // STAGE 1
    glActiveTextureARB( GL_TEXTURE1_ARB );
    glBindTexture( GL_TEXTURE_2D, g_checkerTextureID );

cgGLBindProgram( g_CGprogram_pixel );
cgGLEnableProfile( g_CGprofile_pixel );

// Draw primitives

cgGLDisableProfile( g_CGprofile_pixel );

// In Cg File:

uniform sampler2D testTexture : TEXUNIT0,
uniform sampler2D checkerTexture : TEXUNIT1

Method 2: Using Cg's special texture functions:cgGLSetTextureParameter, cgGLEnableTextureParameter, and cgGLDisableTextureParameter

// In C++ File:

g_CGparam_testTexture = cgGetNamedParameter(g_CGprogram_pixel, "testTexture");
g_CGparam_checkerTexture = cgGetNamedParameter(g_CGprogram_pixel, "checkerTexture");

cgGLBindProgram( g_CGprogram_pixel );
cgGLEnableProfile( g_CGprofile_pixel );

cgGLEnableTextureParameter( g_CGparam_testTexture );
cgGLEnableTextureParameter( g_CGparam_checkerTexture );

// Draw primitives

cgGLDisableTextureParameter( g_CGparam_checkerTexture );
cgGLDisableTextureParameter( g_CGparam_testTexture );

cgGLDisableProfile( g_CGprofile_pixel );

// In Cg File:

uniform sampler2D testTexture,

uniform sampler2D checkerTexture