102 lines
5.8 KiB
C++
102 lines
5.8 KiB
C++
/**************************************************************************************/
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/* */
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/* Visualization Library */
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/* http://visualizationlibrary.org */
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/* */
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/* Copyright (c) 2005-2020, Michele Bosi */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without modification, */
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/* are permitted provided that the following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, this */
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/* list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above copyright notice, this */
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/* list of conditions and the following disclaimer in the documentation and/or */
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/* other materials provided with the distribution. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */
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/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */
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/* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */
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/* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/**************************************************************************************/
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#ifndef PatchParameter_INCLUDE_ONCE
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#define PatchParameter_INCLUDE_ONCE
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#include <vlCore/Object.hpp>
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namespace vl
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{
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//------------------------------------------------------------------------------
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// PatchParameter
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//------------------------------------------------------------------------------
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//! Wrapper of glPatchParameter(), specifies the parameters for patch primitives, used by vl::DrawCall::setPatchParameter().
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//! See also http://www.opengl.org/sdk/docs/man4/xhtml/glPatchParameter.xml
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class PatchParameter: public Object
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{
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VL_INSTRUMENT_CLASS(vl::PatchParameter, Object)
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public:
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//! Constructor
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PatchParameter(): mPatchVertices(0), mPatchDefaultOuterLevel(fvec4(4,4,4,4)), mPatchDefaultInnerLevel(fvec2(4,4))
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{
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VL_DEBUG_SET_OBJECT_NAME()
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}
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//! Applies the glPatchParameter values.
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void apply() const
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{
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VL_CHECK(Has_GL_ARB_tessellation_shader||Has_GL_Version_4_0);
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if (Has_GL_ARB_tessellation_shader||Has_GL_Version_4_0)
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{
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glPatchParameteri(GL_PATCH_VERTICES, mPatchVertices); VL_CHECK_OGL();
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glPatchParameterfv(GL_PATCH_DEFAULT_OUTER_LEVEL, mPatchDefaultOuterLevel.ptr()); VL_CHECK_OGL();
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glPatchParameterfv(GL_PATCH_DEFAULT_INNER_LEVEL, mPatchDefaultInnerLevel.ptr()); VL_CHECK_OGL();
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}
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}
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//! Specifies the number of vertices that will be used to make up a single patch primitive.
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//! Patch primitives are consumed by the tessellation control shader (if present) and subsequently
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//! used for tessellation. When primitives are specified using glDrawArrays or a similar function,
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//! each patch will be made from \a vertices control points, each represented by a vertex taken from
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//! the enabeld vertex arrays. \a vertices must be greater than zero, and less than or equal to the
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//! value of GL_MAX_PATCH_VERTICES.
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void setPatchVertices(int vertices) { mPatchVertices = vertices; }
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//! Returns the number of vertices that will be used to make up a single patch primitive.
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int patchVertices() const { return mPatchVertices; }
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//! The four floating-point values corresponding to the four outer tessellation levels
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//! for each subsequent patch to be used when no tessellation control shader is present.
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void setPatchDefaultOuterLevel(const fvec4& level) { mPatchDefaultOuterLevel = level; }
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//! The four floating-point values corresponding to the four outer tessellation levels
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//! for each subsequent patch to be used when no tessellation control shader is present.
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const fvec4& patchDefaultOuterLevel() const { return mPatchDefaultOuterLevel; }
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//! The two floating-point values corresponding to the tow inner tessellation levels
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//! for each subsequent patch to be used when no tessellation control shader is present.
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void setPatchDefaultInnerLevel(const fvec2& level) { mPatchDefaultInnerLevel = level; }
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//! The two floating-point values corresponding to the tow inner tessellation levels
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//! for each subsequent patch to be used when no tessellation control shader is present.
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const fvec2& patchDefaultInnerLevel() const { return mPatchDefaultInnerLevel; }
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protected:
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int mPatchVertices;
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fvec4 mPatchDefaultOuterLevel;
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fvec2 mPatchDefaultInnerLevel;
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};
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}
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#endif
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