dali/internal/graphics/gles-impl/gles-graphics-framebuffer.cpp

   1 /*
   2  * Copyright (c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include "gles-graphics-framebuffer.h"
  20
  21 // external headers
  22 #include <dali/integration-api/gl-abstraction.h>
  23 #include <dali/integration-api/gl-defines.h>
  24
  25 // Internal headers
  26 #include <dali/internal/graphics/gles-impl/gles-graphics-texture.h>
  27 #include "egl-graphics-controller.h"
  28
  29 namespace Dali::Graphics::GLES
  30 {
  31 namespace
  32 {
  33 const GLenum COLOR_ATTACHMENTS[] =
  34   {
  35     GL_COLOR_ATTACHMENT0,
  36     GL_COLOR_ATTACHMENT1,
  37     GL_COLOR_ATTACHMENT2,
  38     GL_COLOR_ATTACHMENT3,
  39     GL_COLOR_ATTACHMENT4,
  40     GL_COLOR_ATTACHMENT5,
  41     GL_COLOR_ATTACHMENT6,
  42     GL_COLOR_ATTACHMENT7,
  43 };
  44
  45 struct DEPTH_STENCIL_ATTACHMENT_TYPE
  46 {
  47   constexpr explicit DEPTH_STENCIL_ATTACHMENT_TYPE(Graphics::Format textureFormat)
  48   {
  49     switch(textureFormat)
  50     {
  51       case Graphics::Format::D16_UNORM:
  52       case Graphics::Format::D32_SFLOAT:
  53       case Graphics::Format::X8_D24_UNORM_PACK32:
  54       {
  55         attachment = GL_DEPTH_ATTACHMENT;
  56         break;
  57       }
  58
  59       case Graphics::Format::S8_UINT: // Probably won't work as a standalone texture.
  60       {
  61         attachment = GL_STENCIL_ATTACHMENT;
  62         break;
  63       }
  64
  65       case Graphics::Format::D16_UNORM_S8_UINT:
  66       case Graphics::Format::D24_UNORM_S8_UINT:
  67       case Graphics::Format::D32_SFLOAT_S8_UINT:
  68       {
  69         attachment = GL_DEPTH_STENCIL_ATTACHMENT;
  70         break;
  71       }
  72       default:
  73       {
  74         attachment = GL_NONE;
  75         break;
  76       }
  77     }
  78   }
  79   Dali::GLenum attachment{GL_NONE};
  80 };
  81
  82 } // anonymous namespace
  83
  84 Framebuffer::Framebuffer(const Graphics::FramebufferCreateInfo& createInfo, Graphics::EglGraphicsController& controller)
  85 : FramebufferResource(createInfo, controller)
  86 {
  87   // Add framebuffer to the Resource queue
  88   mController.AddFramebuffer(*this);
  89 }
  90
  91 bool Framebuffer::InitializeResource()
  92 {
  93   if(!mInitialized)
  94   {
  95     mInitialized = true;
  96     auto gl      = mController.GetGL();
  97
  98     gl->GenFramebuffers(1, &mFramebufferId);
  99     gl->BindFramebuffer(GL_FRAMEBUFFER, mFramebufferId);
 100
 101     for(Graphics::ColorAttachment& attachment : mCreateInfo.colorAttachments)
 102     {
 103       AttachTexture(attachment.texture, COLOR_ATTACHMENTS[attachment.attachmentId], attachment.layerId, attachment.levelId);
 104     }
 105
 106     // @todo is this per framebuffer, or more immediate state that needs setting when framebuffer changed?
 107     gl->DrawBuffers(mCreateInfo.colorAttachments.size(), COLOR_ATTACHMENTS);
 108
 109     if(mCreateInfo.depthStencilAttachment.depthTexture)
 110     {
 111       // Create a depth or depth/stencil render target.
 112       auto depthTexture = static_cast<const GLES::Texture*>(mCreateInfo.depthStencilAttachment.depthTexture);
 113       auto attachmentId = DEPTH_STENCIL_ATTACHMENT_TYPE(depthTexture->GetCreateInfo().format).attachment;
 114
 115       gl->GenRenderbuffers(1, &mDepthBufferId);
 116       gl->BindRenderbuffer(GL_RENDERBUFFER, mDepthBufferId);
 117       gl->RenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, mCreateInfo.size.width, mCreateInfo.size.height);
 118       gl->FramebufferRenderbuffer(GL_FRAMEBUFFER, attachmentId, GL_RENDERBUFFER, mDepthBufferId);
 119
 120       AttachTexture(depthTexture, attachmentId, 0, mCreateInfo.depthStencilAttachment.depthLevel);
 121     }
 122
 123     if(mCreateInfo.depthStencilAttachment.stencilTexture)
 124     {
 125       auto stencilTexture = static_cast<const GLES::Texture*>(mCreateInfo.depthStencilAttachment.stencilTexture);
 126       auto attachmentId   = DEPTH_STENCIL_ATTACHMENT_TYPE(stencilTexture->GetCreateInfo().format).attachment;
 127
 128       // Create a stencil render target.
 129       gl->GenRenderbuffers(1, &mStencilBufferId);
 130       gl->BindRenderbuffer(GL_RENDERBUFFER, mStencilBufferId);
 131       gl->RenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, mCreateInfo.size.width, mCreateInfo.size.height);
 132       gl->FramebufferRenderbuffer(GL_FRAMEBUFFER, attachmentId, GL_RENDERBUFFER, mStencilBufferId);
 133
 134       AttachTexture(stencilTexture, attachmentId, 0, mCreateInfo.depthStencilAttachment.stencilLevel);
 135     }
 136     gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
 137   }
 138
 139   return mInitialized;
 140 }
 141
 142 void Framebuffer::DestroyResource()
 143 {
 144   auto gl = mController.GetGL();
 145   if(mInitialized)
 146   {
 147     if(mDepthBufferId)
 148     {
 149       gl->DeleteRenderbuffers(1, &mDepthBufferId);
 150     }
 151     if(mStencilBufferId)
 152     {
 153       gl->DeleteRenderbuffers(1, &mStencilBufferId);
 154     }
 155
 156     gl->DeleteFramebuffers(1, &mFramebufferId);
 157     mFramebufferId = 0u;
 158     mInitialized   = false;
 159   }
 160 }
 161
 162 void Framebuffer::DiscardResource()
 163 {
 164   mController.DiscardResource(this);
 165 }
 166
 167 void Framebuffer::Bind() const
 168 {
 169   auto gl = mController.GetGL();
 170   gl->BindFramebuffer(GL_FRAMEBUFFER, mFramebufferId);
 171 }
 172
 173 void Framebuffer::AttachTexture(const Graphics::Texture* texture, uint32_t attachmentId, uint32_t layerId, uint32_t levelId)
 174 {
 175   auto gl              = mController.GetGL();
 176   auto graphicsTexture = static_cast<const GLES::Texture*>(texture);
 177   if(graphicsTexture->GetCreateInfo().textureType == Graphics::TextureType::TEXTURE_2D)
 178   {
 179     gl->FramebufferTexture2D(GL_FRAMEBUFFER, attachmentId, graphicsTexture->GetGlTarget(), graphicsTexture->GetGLTexture(), levelId);
 180   }
 181   else
 182   {
 183     gl->FramebufferTexture2D(GL_FRAMEBUFFER, attachmentId, GL_TEXTURE_CUBE_MAP_POSITIVE_X + layerId, graphicsTexture->GetGLTexture(), levelId);
 184   }
 185 }
 186
 187 } //namespace Dali::Graphics::GLES