bool
TextureModeData::BeginSphereTexturing()
{
glPushAttrib(GL_COLOR_BUFFER_BIT|GL_TEXTURE_BIT|
GL_DEPTH_BUFFER_BIT|GL_ENABLE_BIT);
// Create the rextures
if(!sphereTexturesDataCreated)
{
MakeTextures();
sphereTexturesDataCreated = true;
}
// Create and bind the textures if we have not done that yet.
if(!sphereTexturesLoaded)
{
glGenTextures(1, &textureName);
// Set up the first texture
glBindTexture(GL_TEXTURE_2D, textureName);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 2, SPHERE_TEX_W, SPHERE_TEX_H,
0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, sphereTexture);
sphereTexturesLoaded = true;
}
// set the blend mode
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//
// Get the AlphaTest mode to restore it later.
//
GLint dt = 0;
glGetIntegerv(GL_DEPTH_TEST, &dt);
if(dt == 1)
{
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_GREATER, 0.7);
}
//
// Turn on the texture
//
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, textureName);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
return true;
}
bool
avtOpenGLAtomTexturer2D::BeginSphereTexturing()
{
// Create the rextures
if(!sphereTexturesDataCreated)
{
MakeTextures();
sphereTexturesDataCreated = true;
}
// Create and bind the textures if we have not done that yet.
if(!sphereTexturesLoaded)
{
glGenTextures(1, &textureName);
// Set up the first texture
glBindTexture(GL_TEXTURE_2D, textureName);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 2, SPHERE_TEX_W, SPHERE_TEX_H,
0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, sphereTexture);
sphereTexturesLoaded = true;
}
//
// Get whether GL_BLEND is enabled.
//
glGetIntegerv(GL_BLEND, &isBlendEnabled);
if(isBlendEnabled == 0)
glEnable(GL_BLEND);
glGetIntegerv(GL_BLEND_SRC, &blendFunc0);
glGetIntegerv(GL_BLEND_DST, &blendFunc1);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//
// Get the AlphaTest mode to restore it later.
//
GLint dt = 0;
glGetIntegerv(GL_DEPTH_TEST, &dt);
if(dt == 1)
{
// Get the current alpha test function
glGetIntegerv(GL_ALPHA_TEST, &isAlphaTestEnabled);
if(isAlphaTestEnabled)
{
glGetIntegerv(GL_ALPHA_TEST_FUNC, &alphaTestFunc);
glGetFloatv(GL_ALPHA_TEST_REF, &alphaTestRef);
}
else
glEnable(GL_ALPHA_TEST);
// Set the alpha testing mode and function.
glAlphaFunc(GL_GREATER, 0.7);
needAlphaTest = 1;
}
else
needAlphaTest = 0;
//
// Turn on the texture
//
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, textureName);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
return true;
}
