| 1 | // Created by: Kirill GAVRILOV |
| 2 | // Copyright (c) 2012 OPEN CASCADE SAS |
| 3 | // |
| 4 | // The content of this file is subject to the Open CASCADE Technology Public |
| 5 | // License Version 6.5 (the "License"). You may not use the content of this file |
| 6 | // except in compliance with the License. Please obtain a copy of the License |
| 7 | // at http://www.opencascade.org and read it completely before using this file. |
| 8 | // |
| 9 | // The Initial Developer of the Original Code is Open CASCADE S.A.S., having its |
| 10 | // main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. |
| 11 | // |
| 12 | // The Original Code and all software distributed under the License is |
| 13 | // distributed on an "AS IS" basis, without warranty of any kind, and the |
| 14 | // Initial Developer hereby disclaims all such warranties, including without |
| 15 | // limitation, any warranties of merchantability, fitness for a particular |
| 16 | // purpose or non-infringement. Please see the License for the specific terms |
| 17 | // and conditions governing the rights and limitations under the License. |
| 18 | |
| 19 | #include <OpenGl_TextureBufferArb.hxx> |
| 20 | |
| 21 | #include <OpenGl_Context.hxx> |
| 22 | #include <Standard_Assert.hxx> |
| 23 | |
| 24 | IMPLEMENT_STANDARD_HANDLE (OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
| 25 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
| 26 | |
| 27 | // ======================================================================= |
| 28 | // function : OpenGl_TextureBufferArb |
| 29 | // purpose : |
| 30 | // ======================================================================= |
| 31 | OpenGl_TextureBufferArb::OpenGl_TextureBufferArb() |
| 32 | : OpenGl_VertexBuffer(), |
| 33 | myTextureId (NO_TEXTURE), |
| 34 | myTexFormat (GL_RGBA32F) |
| 35 | { |
| 36 | // |
| 37 | } |
| 38 | |
| 39 | // ======================================================================= |
| 40 | // function : ~OpenGl_TextureBufferArb |
| 41 | // purpose : |
| 42 | // ======================================================================= |
| 43 | OpenGl_TextureBufferArb::~OpenGl_TextureBufferArb() |
| 44 | { |
| 45 | Release (NULL); |
| 46 | } |
| 47 | |
| 48 | // ======================================================================= |
| 49 | // function : GetTarget |
| 50 | // purpose : |
| 51 | // ======================================================================= |
| 52 | GLenum OpenGl_TextureBufferArb::GetTarget() const |
| 53 | { |
| 54 | return GL_TEXTURE_BUFFER_ARB; // GL_TEXTURE_BUFFER for OpenGL 3.1+ |
| 55 | } |
| 56 | |
| 57 | // ======================================================================= |
| 58 | // function : Release |
| 59 | // purpose : |
| 60 | // ======================================================================= |
| 61 | void OpenGl_TextureBufferArb::Release (const OpenGl_Context* theGlCtx) |
| 62 | { |
| 63 | if (myTextureId != NO_TEXTURE) |
| 64 | { |
| 65 | // application can not handle this case by exception - this is bug in code |
| 66 | Standard_ASSERT_RETURN (theGlCtx != NULL, |
| 67 | "OpenGl_TextureBufferExt destroyed without GL context! Possible GPU memory leakage...",); |
| 68 | |
| 69 | glDeleteTextures (1, &myTextureId); |
| 70 | myTextureId = NO_TEXTURE; |
| 71 | } |
| 72 | OpenGl_VertexBuffer::Release (theGlCtx); |
| 73 | } |
| 74 | |
| 75 | // ======================================================================= |
| 76 | // function : Create |
| 77 | // purpose : |
| 78 | // ======================================================================= |
| 79 | bool OpenGl_TextureBufferArb::Create (const Handle(OpenGl_Context)& theGlCtx) |
| 80 | { |
| 81 | if (!OpenGl_VertexBuffer::Create (theGlCtx)) |
| 82 | { |
| 83 | return false; |
| 84 | } |
| 85 | |
| 86 | if (myTextureId == NO_TEXTURE) |
| 87 | { |
| 88 | glGenTextures (1, &myTextureId); |
| 89 | } |
| 90 | return myTextureId != NO_TEXTURE; |
| 91 | } |
| 92 | |
| 93 | // ======================================================================= |
| 94 | // function : Init |
| 95 | // purpose : |
| 96 | // ======================================================================= |
| 97 | bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx, |
| 98 | const GLuint theComponentsNb, |
| 99 | const GLsizei theElemsNb, |
| 100 | const GLfloat* theData) |
| 101 | { |
| 102 | if (theComponentsNb != 1 |
| 103 | && theComponentsNb != 2 |
| 104 | && theComponentsNb != 4) |
| 105 | { |
| 106 | // unsupported format |
| 107 | return false; |
| 108 | } |
| 109 | else if (!Create (theGlCtx) |
| 110 | || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData)) |
| 111 | { |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | switch (theComponentsNb) |
| 116 | { |
| 117 | case 1: myTexFormat = GL_R32F; break; |
| 118 | case 2: myTexFormat = GL_RG32F; break; |
| 119 | //case 3: myTexFormat = GL_RGB32F; break; // GL_ARB_texture_buffer_object_rgb32 |
| 120 | case 4: myTexFormat = GL_RGBA32F; break; |
| 121 | } |
| 122 | |
| 123 | Bind (theGlCtx); |
| 124 | BindTexture (theGlCtx); |
| 125 | theGlCtx->arbTBO->glTexBufferARB (GetTarget(), myTexFormat, myBufferId); |
| 126 | UnbindTexture (theGlCtx); |
| 127 | Unbind (theGlCtx); |
| 128 | return true; |
| 129 | } |
| 130 | |
| 131 | // ======================================================================= |
| 132 | // function : BindTexture |
| 133 | // purpose : |
| 134 | // ======================================================================= |
| 135 | void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx, |
| 136 | const GLenum theTextureUnit) const |
| 137 | { |
| 138 | theGlCtx->core20->glActiveTexture (theTextureUnit); |
| 139 | glBindTexture (GetTarget(), myTextureId); |
| 140 | } |
| 141 | |
| 142 | // ======================================================================= |
| 143 | // function : UnbindTexture |
| 144 | // purpose : |
| 145 | // ======================================================================= |
| 146 | void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx, |
| 147 | const GLenum theTextureUnit) const |
| 148 | { |
| 149 | theGlCtx->core20->glActiveTexture (theTextureUnit); |
| 150 | glBindTexture (GetTarget(), NO_TEXTURE); |
| 151 | } |