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0027787: Visualization, TKOpenGl - Optimize rendering by additional check whether the object is fully clipped or not

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OpenGl_Structure::Render() now checks if structure is entirely clipped to skip rendering at all,
or entirely NOT clipped to disable clipping / capping plane.

OpenGl_ShaderManager now defines dedicated GLSL programs for one and two clipping planes
to optimize rendering on slow hardware.
This commit is contained in:
dbp
2016-08-18 19:41:05 +03:00
committed by bugmaster
parent afa6834bcd
commit 1a7ece8f23
7 changed files with 178 additions and 40 deletions
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67
src/OpenGl/OpenGl_ShaderManager.cxx
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@@ -221,7 +221,7 @@ const char THE_FUNC_directionalLightFirst[] =
//! Process clipping planes in Fragment Shader.
//! Should be added at the beginning of the main() function.
const char THE_FRAG_CLIP_PLANES[] =
const char THE_FRAG_CLIP_PLANES_N[] =
EOL" for (int aPlaneIter = 0; aPlaneIter < occClipPlaneCount; ++aPlaneIter)"
EOL" {"
EOL" vec4 aClipEquation = occClipPlaneEquations[aPlaneIter];"
@@ -231,6 +231,24 @@ const char THE_FRAG_CLIP_PLANES[] =
EOL" }"
EOL" }";
//! Process 1 clipping plane in Fragment Shader.
const char THE_FRAG_CLIP_PLANES_1[] =
EOL" vec4 aClipEquation0 = occClipPlaneEquations[0];"
EOL" if (dot (aClipEquation0.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation0.w < 0.0)"
EOL" {"
EOL" discard;"
EOL" }";
//! Process 2 clipping planes in Fragment Shader.
const char THE_FRAG_CLIP_PLANES_2[] =
EOL" vec4 aClipEquation0 = occClipPlaneEquations[0];"
EOL" vec4 aClipEquation1 = occClipPlaneEquations[1];"
EOL" if (dot (aClipEquation0.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation0.w < 0.0"
EOL" || dot (aClipEquation1.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation1.w < 0.0)"
EOL" {"
EOL" discard;"
EOL" }";
}
// =======================================================================
@@ -1048,7 +1066,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramFlat (Handle(OpenGl_Shad
aSrcFragExtraOut += EOL"THE_SHADER_IN vec4 VertColor;";
aSrcFragGetColor = EOL"vec4 getColor(void) { return VertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanes) != 0)
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
aSrcVertExtraOut +=
EOL"THE_SHADER_OUT vec4 PositionWorld;"
@@ -1059,7 +1077,19 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramFlat (Handle(OpenGl_Shad
aSrcVertExtraMain +=
EOL" PositionWorld = occModelWorldMatrix * occVertex;"
EOL" Position = occWorldViewMatrix * PositionWorld;";
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES;
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
TCollection_AsciiString aSrcVertEndMain;
@@ -1325,7 +1355,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramGouraud (Handle(OpenGl_S
aSrcVertColor = EOL"vec4 getVertColor(void) { return occVertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanes) != 0)
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
aSrcVertExtraOut +=
EOL"THE_SHADER_OUT vec4 PositionWorld;"
@@ -1336,7 +1366,19 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramGouraud (Handle(OpenGl_S
aSrcVertExtraMain +=
EOL" PositionWorld = aPositionWorld;"
EOL" Position = aPosition;";
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES;
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
const TCollection_AsciiString aLights = stdComputeLighting ((theBits & OpenGl_PO_VertColor) != 0);
@@ -1446,9 +1488,20 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramPhong (Handle(OpenGl_Sha
EOL"vec4 getVertColor(void) { return VertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanes) != 0)
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES;
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
aSrcVert = TCollection_AsciiString()