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OpenGL (1.2 - 2.0) Code Samples - Page 14
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Simple Displacement Mapping Using Cg |
| This sample demonstrates
how to perform displacement mapping
using Cg. The sample requires support
for CG_PROFILE_VP40, which basically
means that your card needs to support
GL_ARB_vertex_program and
GL_NV_vertex_program3.
Relevant Keywords: cgGLIsProfileSupported,
cgCreateContext, cgCreateProgramFromFile,
cgGLLoadProgram, cgGetNamedParameter, cgGLSetStateMatrixParameter,
cgGLSetParameter4fv, cgGLBindProgram, cgGLEnableProfile,
cgGLDisableProfile, cgDestroyProgram, cgDestroyContext,
CGprofile, CGcontext, CGprogram, CGparameter,
GL_NEAREST, GL_TEXTURE_MIN_FILTER,
GL_TEXTURE_MAG_FILTER,
GL_RGBA_FLOAT32_ATI, CG_PROFILE_VP40, CG_SOURCE, CG_GL_MODELVIEW_PROJECTION_MATRIX,
CG_GL_MATRIX_IDENTITY, POSITION, COLOR0,
NORMAL, TEXCOORD0, sampler2D, TEXUNIT1,
state.matrix.mvp, main, float4, uniform, float4x4,
and mul.
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Off-screen Rendering Using Frame-Buffer
Objects |
| This sample demonstrates
how to create dynamic textures
through off-screen rendering. The
off-screen rendering step is
accomplished using a frame-buffer and
render-buffer object, which is created
using OpenGL's
EXT_framebuffer_object extension.
As a demonstration, a spinning
textured cube is rendered to a
frame-buffer object, which is in turn,
used to create a dynamic texture. The
dynamic texture is then used to texture
a second spinning cube, which will be
rendered to the application's window.
Relevant Keywords:
glIsRenderbufferEXT,
glBindRenderbufferEXT,
glDeleteRenderbuffersEXT,
glGenRenderbuffersEXT,
glRenderbufferStorageEXT,
glGetRenderbufferParameterivEXT,
glIsFramebufferEXT, glBindFramebufferEXT,
glDeleteFramebuffersEXT,
glGenFramebuffersEXT,
glCheckFramebufferStatusEXT,
glFramebufferTexture1DEXT,
glFramebufferTexture2DEXT,
glFramebufferTexture3DEXT,
glFramebufferRenderbufferEXT,
glGetFramebufferAttachmentParameterivEXT,
glGenerateMipmapEXT,
PFNGLISRENDERBUFFEREXTPROC,
PFNGLBINDRENDERBUFFEREXTPROC,
PFNGLDELETERENDERBUFFERSEXTPROC,
PFNGLGENRENDERBUFFERSEXTPROC,
PFNGLRENDERBUFFERSTORAGEEXTPROC,
PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC,
PFNGLISFRAMEBUFFEREXTPROC,
PFNGLBINDFRAMEBUFFEREXTPROC,
PFNGLDELETEFRAMEBUFFERSEXTPROC,
PFNGLGENFRAMEBUFFERSEXTPROC,
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC,
PFNGLFRAMEBUFFERTEXTURE1DEXTPROC,
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC,
PFNGLFRAMEBUFFERTEXTURE3DEXTPROC,
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC,
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC,
PFNGLGENERATEMIPMAPEXTPROC,
GL_RENDERBUFFER_EXT,
GL_DEPTH_COMPONENT24, GL_FRAMEBUFFER_EXT,
GL_FRAMEBUFFER_COMPLETE_EXT,
GL_FRAMEBUFFER_UNSUPPORTED_EXT,
GL_COLOR_ATTACHMENT0_EXT, and
GL_DEPTH_ATTACHMENT_EXT.
Note: The
EXT_framebuffer_object
extension is an excellent replacement
for the
WGL_ARB_pbuffer
and
WGL_ARB_render_texture combo
which is normally used to create dynamic
textures. An example of this older
technique can be found
here.
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