Two Methods of Multitexture In Cg

最新推荐文章于 2025-08-24 11:06:10 发布

最新推荐文章于 2025-08-24 11:06:10 发布 · 69 阅读

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博客介绍了在C++中使用OpenGL多纹理的两种方法。方法一是利用OpenGL原生多纹理支持，通过语义识别纹理；方法二则是使用Cg的特殊纹理函数，如cgGLSetTextureParameter等。文中给出了C++和Cg文件中的具体代码实现。

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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");

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

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