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0026892: Visualization, TKOpenGl - support 3D textures within OpenGl_Texture

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Add a new arbTexFloat extension in OpenGl_Context.
Add a new prototype glTexImage in OpenGl_GlFunctions.
Push error message if glTexImage3D is unavailable.
This commit is contained in:
isk
2015-11-25 11:35:38 +03:00
committed by bugmaster
parent ad2a55b2f3
commit 74fb257d6c
5 changed files with 153 additions and 7 deletions
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122
src/OpenGl/OpenGl_Texture.cxx
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@@ -55,6 +55,7 @@ OpenGl_Texture::OpenGl_Texture (const Handle(Graphic3d_TextureParams)& theParams
myTarget (GL_TEXTURE_2D),
mySizeX (0),
mySizeY (0),
mySizeZ (0),
myTextFormat (GL_RGBA),
myHasMipmaps (Standard_False),
myIsAlpha (false),
@@ -379,6 +380,7 @@ bool OpenGl_Texture::Init (const Handle(OpenGl_Context)& theCtx,
#else
// ES does not support sized formats and format conversions - them detected from data type
const GLint anIntFormat = thePixelFormat;
(void) theTextFormat;
#endif
const GLsizei aWidth = theSizeX;
const GLsizei aHeight = theSizeY;
@@ -794,3 +796,123 @@ bool OpenGl_Texture::InitRectangle (const Handle(OpenGl_Context)& theCtx,
return false;
#endif
}
// =======================================================================
// function : Init3D
// purpose :
// =======================================================================
bool OpenGl_Texture::Init3D (const Handle(OpenGl_Context)& theCtx,
const GLint theTextFormat,
const GLenum thePixelFormat,
const GLenum theDataType,
const Standard_Integer theSizeX,
const Standard_Integer theSizeY,
const Standard_Integer theSizeZ,
const void* thePixels)
{
if (theCtx->Functions()->glTexImage3D == NULL)
{
TCollection_ExtendedString aMsg ("Error: three-dimensional textures are not supported by hardware.");
theCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_ERROR,
0,
GL_DEBUG_SEVERITY_HIGH,
aMsg);
return false;
}
if (!Create(theCtx))
{
return false;
}
myTarget = GL_TEXTURE_3D;
const GLsizei aSizeX = Min (theCtx->MaxTextureSize(), theSizeX);
const GLsizei aSizeY = Min (theCtx->MaxTextureSize(), theSizeY);
const GLsizei aSizeZ = Min (theCtx->MaxTextureSize(), theSizeZ);
Bind (theCtx);
if (theDataType == GL_FLOAT && !theCtx->arbTexFloat)
{
TCollection_ExtendedString aMsg ("Error: floating-point textures are not supported by hardware.");
theCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_ERROR,
0,
GL_DEBUG_SEVERITY_HIGH,
aMsg);
Release (theCtx.operator->());
Unbind (theCtx);
return false;
}
const GLint anIntFormat = theTextFormat;
#if !defined (GL_ES_VERSION_2_0)
theCtx->core15fwd->glTexImage3D (GL_PROXY_TEXTURE_3D,
0,
anIntFormat,
aSizeX,
aSizeY,
aSizeZ,
0,
thePixelFormat,
theDataType,
NULL);
GLint aTestSizeX = 0;
GLint aTestSizeY = 0;
GLint aTestSizeZ = 0;
glGetTexLevelParameteriv (GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_WIDTH, &aTestSizeX);
glGetTexLevelParameteriv (GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_HEIGHT, &aTestSizeY);
glGetTexLevelParameteriv (GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_DEPTH, &aTestSizeZ);
if (aTestSizeX == 0 || aTestSizeY == 0 || aTestSizeZ == 0)
{
Unbind (theCtx);
Release (theCtx.operator->());
return false;
}
#endif
const GLenum aWrapMode = myParams->IsRepeat() ? GL_REPEAT : theCtx->TextureWrapClamp();
const GLenum aFilter = (myParams->Filter() == Graphic3d_TOTF_NEAREST) ? GL_NEAREST : GL_LINEAR;
glTexParameteri (myTarget, GL_TEXTURE_WRAP_S, aWrapMode);
glTexParameteri (myTarget, GL_TEXTURE_WRAP_T, aWrapMode);
glTexParameteri (myTarget, GL_TEXTURE_WRAP_R, aWrapMode);
glTexParameteri (myTarget, GL_TEXTURE_MIN_FILTER, aFilter);
glTexParameteri (myTarget, GL_TEXTURE_MAG_FILTER, aFilter);
theCtx->Functions()->glTexImage3D (myTarget,
0,
anIntFormat,
aSizeX,
aSizeY,
aSizeZ,
0,
thePixelFormat,
theDataType,
thePixels);
if (glGetError() != GL_NO_ERROR)
{
Unbind (theCtx);
Release (theCtx.operator->());
return false;
}
mySizeX = aSizeX;
mySizeY = aSizeY;
mySizeZ = aSizeZ;
Unbind (theCtx);
return true;
}