// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <memory>
#include <vector>

#include "Common/Common.h"
#include "Common/CommonFuncs.h"
#include "Common/GL/GLInterfaceBase.h"
#include "Core/HW/Memmap.h"

#include "VideoBackends/OGL/FramebufferManager.h"
#include "VideoBackends/OGL/Render.h"
#include "VideoBackends/OGL/SamplerCache.h"
#include "VideoBackends/OGL/TextureConverter.h"

#include "VideoCommon/DriverDetails.h"
#include "VideoCommon/OnScreenDisplay.h"
#include "VideoCommon/VertexShaderGen.h"

namespace OGL
{
int FramebufferManager::m_targetWidth;
int FramebufferManager::m_targetHeight;
int FramebufferManager::m_msaaSamples;

GLenum FramebufferManager::m_textureType;
std::vector<GLuint> FramebufferManager::m_efbFramebuffer;
GLuint FramebufferManager::m_xfbFramebuffer;
GLuint FramebufferManager::m_efbColor;
GLuint FramebufferManager::m_efbDepth;
GLuint FramebufferManager::m_efbColorSwap;  // for hot swap when reinterpreting EFB pixel formats

// Only used in MSAA mode.
std::vector<GLuint> FramebufferManager::m_resolvedFramebuffer;
GLuint FramebufferManager::m_resolvedColorTexture;
GLuint FramebufferManager::m_resolvedDepthTexture;

// reinterpret pixel format
SHADER FramebufferManager::m_pixel_format_shaders[2];

// EFB pokes
GLuint FramebufferManager::m_EfbPokes_VBO;
GLuint FramebufferManager::m_EfbPokes_VAO;
SHADER FramebufferManager::m_EfbPokes;

FramebufferManager::FramebufferManager(int targetWidth, int targetHeight, int msaaSamples)
{
  m_xfbFramebuffer = 0;
  m_efbColor = 0;
  m_efbDepth = 0;
  m_efbColorSwap = 0;
  m_resolvedColorTexture = 0;
  m_resolvedDepthTexture = 0;

  m_targetWidth = targetWidth;
  m_targetHeight = targetHeight;

  m_msaaSamples = msaaSamples;

  // The EFB can be set to different pixel formats by the game through the
  // BPMEM_ZCOMPARE register (which should probably have a different name).
  // They are:
  // - 24-bit RGB (8-bit components) with 24-bit Z
  // - 24-bit RGBA (6-bit components) with 24-bit Z
  // - Multisampled 16-bit RGB (5-6-5 format) with 16-bit Z
  // We only use one EFB format here: 32-bit ARGB with 24-bit Z.
  // Multisampling depends on user settings.
  // The distinction becomes important for certain operations, i.e. the
  // alpha channel should be ignored if the EFB does not have one.

  glActiveTexture(GL_TEXTURE9);

  GLuint glObj[3];
  glGenTextures(3, glObj);
  m_efbColor = glObj[0];
  m_efbDepth = glObj[1];
  m_efbColorSwap = glObj[2];

  m_EFBLayers = (g_ActiveConfig.iStereoMode > 0) ? 2 : 1;
  m_efbFramebuffer.resize(m_EFBLayers);
  m_resolvedFramebuffer.resize(m_EFBLayers);

  // OpenGL MSAA textures are a different kind of texture type and must be allocated
  // with a different function, so we create them separately.
  if (m_msaaSamples <= 1)
  {
    m_textureType = GL_TEXTURE_2D_ARRAY;

    glBindTexture(m_textureType, m_efbColor);
    glTexParameteri(m_textureType, GL_TEXTURE_MAX_LEVEL, 0);
    glTexImage3D(m_textureType, 0, GL_RGBA, m_targetWidth, m_targetHeight, m_EFBLayers, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, nullptr);

    glBindTexture(m_textureType, m_efbDepth);
    glTexParameteri(m_textureType, GL_TEXTURE_MAX_LEVEL, 0);
    glTexImage3D(m_textureType, 0, GL_DEPTH_COMPONENT32F, m_targetWidth, m_targetHeight,
                 m_EFBLayers, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);

    glBindTexture(m_textureType, m_efbColorSwap);
    glTexParameteri(m_textureType, GL_TEXTURE_MAX_LEVEL, 0);
    glTexImage3D(m_textureType, 0, GL_RGBA, m_targetWidth, m_targetHeight, m_EFBLayers, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, nullptr);
  }
  else
  {
    GLenum resolvedType = GL_TEXTURE_2D_ARRAY;

    // Only use a layered multisample texture if needed. Some drivers
    // slow down significantly with single-layered multisample textures.
    if (m_EFBLayers > 1)
    {
      m_textureType = GL_TEXTURE_2D_MULTISAMPLE_ARRAY;

      if (g_ogl_config.bSupports3DTextureStorage)
      {
        glBindTexture(m_textureType, m_efbColor);
        glTexStorage3DMultisample(m_textureType, m_msaaSamples, GL_RGBA8, m_targetWidth,
                                  m_targetHeight, m_EFBLayers, false);

        glBindTexture(m_textureType, m_efbDepth);
        glTexStorage3DMultisample(m_textureType, m_msaaSamples, GL_DEPTH_COMPONENT32F,
                                  m_targetWidth, m_targetHeight, m_EFBLayers, false);

        glBindTexture(m_textureType, m_efbColorSwap);
        glTexStorage3DMultisample(m_textureType, m_msaaSamples, GL_RGBA8, m_targetWidth,
                                  m_targetHeight, m_EFBLayers, false);
        glBindTexture(m_textureType, 0);
      }
      else
      {
        glBindTexture(m_textureType, m_efbColor);
        glTexImage3DMultisample(m_textureType, m_msaaSamples, GL_RGBA, m_targetWidth,
                                m_targetHeight, m_EFBLayers, false);

        glBindTexture(m_textureType, m_efbDepth);
        glTexImage3DMultisample(m_textureType, m_msaaSamples, GL_DEPTH_COMPONENT32F, m_targetWidth,
                                m_targetHeight, m_EFBLayers, false);

        glBindTexture(m_textureType, m_efbColorSwap);
        glTexImage3DMultisample(m_textureType, m_msaaSamples, GL_RGBA, m_targetWidth,
                                m_targetHeight, m_EFBLayers, false);
        glBindTexture(m_textureType, 0);
      }
    }
    else
    {
      m_textureType = GL_TEXTURE_2D_MULTISAMPLE;

      if (g_ogl_config.bSupports2DTextureStorage)
      {
        glBindTexture(m_textureType, m_efbColor);
        glTexStorage2DMultisample(m_textureType, m_msaaSamples, GL_RGBA8, m_targetWidth,
                                  m_targetHeight, false);

        glBindTexture(m_textureType, m_efbDepth);
        glTexStorage2DMultisample(m_textureType, m_msaaSamples, GL_DEPTH_COMPONENT32F,
                                  m_targetWidth, m_targetHeight, false);

        glBindTexture(m_textureType, m_efbColorSwap);
        glTexStorage2DMultisample(m_textureType, m_msaaSamples, GL_RGBA8, m_targetWidth,
                                  m_targetHeight, false);
        glBindTexture(m_textureType, 0);
      }
      else
      {
        glBindTexture(m_textureType, m_efbColor);
        glTexImage2DMultisample(m_textureType, m_msaaSamples, GL_RGBA, m_targetWidth,
                                m_targetHeight, false);

        glBindTexture(m_textureType, m_efbDepth);
        glTexImage2DMultisample(m_textureType, m_msaaSamples, GL_DEPTH_COMPONENT32F, m_targetWidth,
                                m_targetHeight, false);

        glBindTexture(m_textureType, m_efbColorSwap);
        glTexImage2DMultisample(m_textureType, m_msaaSamples, GL_RGBA, m_targetWidth,
                                m_targetHeight, false);
        glBindTexture(m_textureType, 0);
      }
    }

    // Although we are able to access the multisampled texture directly, we don't do it everywhere.
    // The old way is to "resolve" this multisampled texture by copying it into a non-sampled
    // texture.
    // This would lead to an unneeded copy of the EFB, so we are going to avoid it.
    // But as this job isn't done right now, we do need that texture for resolving:
    glGenTextures(2, glObj);
    m_resolvedColorTexture = glObj[0];
    m_resolvedDepthTexture = glObj[1];

    glBindTexture(resolvedType, m_resolvedColorTexture);
    glTexParameteri(resolvedType, GL_TEXTURE_MAX_LEVEL, 0);
    glTexImage3D(resolvedType, 0, GL_RGBA, m_targetWidth, m_targetHeight, m_EFBLayers, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, nullptr);

    glBindTexture(resolvedType, m_resolvedDepthTexture);
    glTexParameteri(resolvedType, GL_TEXTURE_MAX_LEVEL, 0);
    glTexImage3D(resolvedType, 0, GL_DEPTH_COMPONENT32F, m_targetWidth, m_targetHeight, m_EFBLayers,
                 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);

    // Bind resolved textures to resolved framebuffer.
    glGenFramebuffers(m_EFBLayers, m_resolvedFramebuffer.data());
    glBindFramebuffer(GL_FRAMEBUFFER, m_resolvedFramebuffer[0]);
    FramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, resolvedType, m_resolvedColorTexture,
                       0);
    FramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, resolvedType, m_resolvedDepthTexture,
                       0);

    // Bind all the other layers as separate FBOs for blitting.
    for (unsigned int i = 1; i < m_EFBLayers; i++)
    {
      glBindFramebuffer(GL_FRAMEBUFFER, m_resolvedFramebuffer[i]);
      glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_resolvedColorTexture, 0, i);
      glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_resolvedDepthTexture, 0, i);
    }
  }

  // Create XFB framebuffer; targets will be created elsewhere.
  glGenFramebuffers(1, &m_xfbFramebuffer);

  // Bind target textures to EFB framebuffer.
  glGenFramebuffers(m_EFBLayers, m_efbFramebuffer.data());
  glBindFramebuffer(GL_FRAMEBUFFER, m_efbFramebuffer[0]);
  FramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_textureType, m_efbColor, 0);
  FramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_textureType, m_efbDepth, 0);

  // Bind all the other layers as separate FBOs for blitting.
  for (unsigned int i = 1; i < m_EFBLayers; i++)
  {
    glBindFramebuffer(GL_FRAMEBUFFER, m_efbFramebuffer[i]);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_efbColor, 0, i);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_efbDepth, 0, i);
  }

  // EFB framebuffer is currently bound, make sure to clear its alpha value to 1.f
  glViewport(0, 0, m_targetWidth, m_targetHeight);
  glScissor(0, 0, m_targetWidth, m_targetHeight);
  glClearColor(0.f, 0.f, 0.f, 1.f);
  glClearDepthf(1.0f);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  // reinterpret pixel format
  const char* vs = m_EFBLayers > 1 ? "void main(void) {\n"
                                     "	vec2 rawpos = vec2(gl_VertexID&1, gl_VertexID&2);\n"
                                     "	gl_Position = vec4(rawpos*2.0-1.0, 0.0, 1.0);\n"
                                     "}\n" :
                                     "flat out int layer;\n"
                                     "void main(void) {\n"
                                     "	layer = 0;\n"
                                     "	vec2 rawpos = vec2(gl_VertexID&1, gl_VertexID&2);\n"
                                     "	gl_Position = vec4(rawpos*2.0-1.0, 0.0, 1.0);\n"
                                     "}\n";

  // The way to sample the EFB is based on the on the current configuration.
  // As we use the same sampling way for both interpreting shaders, the sampling
  // shader are generated first:
  std::string sampler;
  if (m_msaaSamples <= 1)
  {
    // non-msaa, so just fetch the pixel
    sampler = "SAMPLER_BINDING(9) uniform sampler2DArray samp9;\n"
              "vec4 sampleEFB(ivec3 pos) {\n"
              "	return texelFetch(samp9, pos, 0);\n"
              "}\n";
  }
  else if (g_ActiveConfig.backend_info.bSupportsSSAA)
  {
    // msaa + sample shading available, so just fetch the sample
    // This will lead to sample shading, but it's the only way to not loose
    // the values of each sample.
    if (m_EFBLayers > 1)
    {
      sampler = "SAMPLER_BINDING(9) uniform sampler2DMSArray samp9;\n"
                "vec4 sampleEFB(ivec3 pos) {\n"
                "	return texelFetch(samp9, pos, gl_SampleID);\n"
                "}\n";
    }
    else
    {
      sampler = "SAMPLER_BINDING(9) uniform sampler2DMS samp9;\n"
                "vec4 sampleEFB(ivec3 pos) {\n"
                "	return texelFetch(samp9, pos.xy, gl_SampleID);\n"
                "}\n";
    }
  }
  else
  {
    // msaa without sample shading: calculate the mean value of the pixel
    std::stringstream samples;
    samples << m_msaaSamples;
    if (m_EFBLayers > 1)
    {
      sampler = "SAMPLER_BINDING(9) uniform sampler2DMSArray samp9;\n"
                "vec4 sampleEFB(ivec3 pos) {\n"
                "	vec4 color = vec4(0.0, 0.0, 0.0, 0.0);\n"
                "	for(int i=0; i<" +
                samples.str() + "; i++)\n"
                                "		color += texelFetch(samp9, pos, i);\n"
                                "	return color / " +
                samples.str() + ";\n"
                                "}\n";
    }
    else
    {
      sampler = "SAMPLER_BINDING(9) uniform sampler2DMS samp9;\n"
                "vec4 sampleEFB(ivec3 pos) {\n"
                "	vec4 color = vec4(0.0, 0.0, 0.0, 0.0);\n"
                "	for(int i=0; i<" +
                samples.str() + "; i++)\n"
                                "		color += texelFetch(samp9, pos.xy, i);\n"
                                "	return color / " +
                samples.str() + ";\n"
                                "}\n";
    }
  }

  std::string ps_rgba6_to_rgb8 =
      sampler + "flat in int layer;\n"
                "out vec4 ocol0;\n"
                "void main()\n"
                "{\n"
                "	ivec4 src6 = ivec4(round(sampleEFB(ivec3(gl_FragCoord.xy, layer)) * 63.f));\n"
                "	ivec4 dst8;\n"
                "	dst8.r = (src6.r << 2) | (src6.g >> 4);\n"
                "	dst8.g = ((src6.g & 0xF) << 4) | (src6.b >> 2);\n"
                "	dst8.b = ((src6.b & 0x3) << 6) | src6.a;\n"
                "	dst8.a = 255;\n"
                "	ocol0 = float4(dst8) / 255.f;\n"
                "}";

  std::string ps_rgb8_to_rgba6 =
      sampler + "flat in int layer;\n"
                "out vec4 ocol0;\n"
                "void main()\n"
                "{\n"
                "	ivec4 src8 = ivec4(round(sampleEFB(ivec3(gl_FragCoord.xy, layer)) * 255.f));\n"
                "	ivec4 dst6;\n"
                "	dst6.r = src8.r >> 2;\n"
                "	dst6.g = ((src8.r & 0x3) << 4) | (src8.g >> 4);\n"
                "	dst6.b = ((src8.g & 0xF) << 2) | (src8.b >> 6);\n"
                "	dst6.a = src8.b & 0x3F;\n"
                "	ocol0 = float4(dst6) / 63.f;\n"
                "}";

  std::stringstream vertices, layers;
  vertices << m_EFBLayers * 3;
  layers << m_EFBLayers;
  std::string gs = "layout(triangles) in;\n"
                   "layout(triangle_strip, max_vertices = " +
                   vertices.str() + ") out;\n"
                                    "flat out int layer;\n"
                                    "void main()\n"
                                    "{\n"
                                    "	for (int j = 0; j < " +
                   layers.str() + "; ++j) {\n"
                                  "		for (int i = 0; i < 3; ++i) {\n"
                                  "			layer = j;\n"
                                  "			gl_Layer = j;\n"
                                  "			gl_Position = gl_in[i].gl_Position;\n"
                                  "			EmitVertex();\n"
                                  "		}\n"
                                  "		EndPrimitive();\n"
                                  "	}\n"
                                  "}\n";

  ProgramShaderCache::CompileShader(m_pixel_format_shaders[0], vs, ps_rgb8_to_rgba6,
                                    (m_EFBLayers > 1) ? gs : "");
  ProgramShaderCache::CompileShader(m_pixel_format_shaders[1], vs, ps_rgba6_to_rgb8,
                                    (m_EFBLayers > 1) ? gs : "");

  ProgramShaderCache::CompileShader(
      m_EfbPokes,
      StringFromFormat("in vec2 rawpos;\n"
                       "in vec4 color0;\n"  // color
                       "in int color1;\n"   // depth
                       "out vec4 v_c;\n"
                       "out float v_z;\n"
                       "void main(void) {\n"
                       "	gl_Position = vec4(((rawpos + 0.5) / vec2(640.0, 528.0) * 2.0 - 1.0) * "
                       "vec2(1.0, -1.0), 0.0, 1.0);\n"
                       "	gl_PointSize = %d.0 / 640.0;\n"
                       "	v_c = color0.bgra;\n"
                       "	v_z = float(color1 & 0xFFFFFF) / 16777216.0;\n"
                       "}\n",
                       m_targetWidth),

      StringFromFormat("in vec4 %s_c;\n"
                       "in float %s_z;\n"
                       "out vec4 ocol0;\n"
                       "void main(void) {\n"
                       "	ocol0 = %s_c;\n"
                       "	gl_FragDepth = %s_z;\n"
                       "}\n",
                       m_EFBLayers > 1 ? "g" : "v", m_EFBLayers > 1 ? "g" : "v",
                       m_EFBLayers > 1 ? "g" : "v", m_EFBLayers > 1 ? "g" : "v"),

      m_EFBLayers > 1 ? StringFromFormat("layout(points) in;\n"
                                         "layout(points, max_vertices = %d) out;\n"
                                         "in vec4 v_c[1];\n"
                                         "in float v_z[1];\n"
                                         "out vec4 g_c;\n"
                                         "out float g_z;\n"
                                         "void main()\n"
                                         "{\n"
                                         "	for (int j = 0; j < %d; ++j) {\n"
                                         "		gl_Layer = j;\n"
                                         "		gl_Position = gl_in[0].gl_Position;\n"
                                         "		gl_PointSize = %d.0 / 640.0;\n"
                                         "		g_c = v_c[0];\n"
                                         "		g_z = v_z[0];\n"
                                         "		EmitVertex();\n"
                                         "		EndPrimitive();\n"
                                         "	}\n"
                                         "}\n",
                                         m_EFBLayers, m_EFBLayers, m_targetWidth) :
                        "");
  glGenBuffers(1, &m_EfbPokes_VBO);
  glGenVertexArrays(1, &m_EfbPokes_VAO);
  glBindBuffer(GL_ARRAY_BUFFER, m_EfbPokes_VBO);
  glBindVertexArray(m_EfbPokes_VAO);
  glEnableVertexAttribArray(SHADER_POSITION_ATTRIB);
  glVertexAttribPointer(SHADER_POSITION_ATTRIB, 2, GL_UNSIGNED_SHORT, 0, sizeof(EfbPokeData),
                        (void*)offsetof(EfbPokeData, x));
  glEnableVertexAttribArray(SHADER_COLOR0_ATTRIB);
  glVertexAttribPointer(SHADER_COLOR0_ATTRIB, 4, GL_UNSIGNED_BYTE, 1, sizeof(EfbPokeData),
                        (void*)offsetof(EfbPokeData, data));
  glEnableVertexAttribArray(SHADER_COLOR1_ATTRIB);
  glVertexAttribIPointer(SHADER_COLOR1_ATTRIB, 1, GL_INT, sizeof(EfbPokeData),
                         (void*)offsetof(EfbPokeData, data));

  if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGL)
    glEnable(GL_PROGRAM_POINT_SIZE);
}

FramebufferManager::~FramebufferManager()
{
  glBindFramebuffer(GL_FRAMEBUFFER, 0);

  GLuint glObj[3];

  // Note: OpenGL deletion functions silently ignore parameters of "0".

  glDeleteFramebuffers(m_EFBLayers, m_efbFramebuffer.data());
  glDeleteFramebuffers(m_EFBLayers, m_resolvedFramebuffer.data());

  // Required, as these are static class members
  m_efbFramebuffer.clear();
  m_resolvedFramebuffer.clear();

  glDeleteFramebuffers(1, &m_xfbFramebuffer);
  m_xfbFramebuffer = 0;

  glObj[0] = m_resolvedColorTexture;
  glObj[1] = m_resolvedDepthTexture;
  glDeleteTextures(2, glObj);
  m_resolvedColorTexture = 0;
  m_resolvedDepthTexture = 0;

  glObj[0] = m_efbColor;
  glObj[1] = m_efbDepth;
  glObj[2] = m_efbColorSwap;
  glDeleteTextures(3, glObj);
  m_efbColor = 0;
  m_efbDepth = 0;
  m_efbColorSwap = 0;

  // reinterpret pixel format
  m_pixel_format_shaders[0].Destroy();
  m_pixel_format_shaders[1].Destroy();

  // EFB pokes
  glDeleteBuffers(1, &m_EfbPokes_VBO);
  glDeleteVertexArrays(1, &m_EfbPokes_VAO);
  m_EfbPokes_VBO = 0;
  m_EfbPokes_VAO = 0;
  m_EfbPokes.Destroy();
}

GLuint FramebufferManager::GetEFBColorTexture(const EFBRectangle& sourceRc)
{
  if (m_msaaSamples <= 1)
  {
    return m_efbColor;
  }
  else
  {
    // Transfer the EFB to a resolved texture. EXT_framebuffer_blit is
    // required.

    TargetRectangle targetRc = g_renderer->ConvertEFBRectangle(sourceRc);
    targetRc.ClampUL(0, 0, m_targetWidth, m_targetHeight);

    // Resolve.
    for (unsigned int i = 0; i < m_EFBLayers; i++)
    {
      glBindFramebuffer(GL_READ_FRAMEBUFFER, m_efbFramebuffer[i]);
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_resolvedFramebuffer[i]);
      glBlitFramebuffer(targetRc.left, targetRc.top, targetRc.right, targetRc.bottom, targetRc.left,
                        targetRc.top, targetRc.right, targetRc.bottom, GL_COLOR_BUFFER_BIT,
                        GL_NEAREST);
    }

    // Return to EFB.
    glBindFramebuffer(GL_FRAMEBUFFER, m_efbFramebuffer[0]);

    return m_resolvedColorTexture;
  }
}

GLuint FramebufferManager::GetEFBDepthTexture(const EFBRectangle& sourceRc)
{
  if (m_msaaSamples <= 1)
  {
    return m_efbDepth;
  }
  else
  {
    // Transfer the EFB to a resolved texture.

    TargetRectangle targetRc = g_renderer->ConvertEFBRectangle(sourceRc);
    targetRc.ClampUL(0, 0, m_targetWidth, m_targetHeight);

    // Resolve.
    for (unsigned int i = 0; i < m_EFBLayers; i++)
    {
      glBindFramebuffer(GL_READ_FRAMEBUFFER, m_efbFramebuffer[i]);
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_resolvedFramebuffer[i]);
      glBlitFramebuffer(targetRc.left, targetRc.top, targetRc.right, targetRc.bottom, targetRc.left,
                        targetRc.top, targetRc.right, targetRc.bottom, GL_DEPTH_BUFFER_BIT,
                        GL_NEAREST);
    }

    // Return to EFB.
    glBindFramebuffer(GL_FRAMEBUFFER, m_efbFramebuffer[0]);

    return m_resolvedDepthTexture;
  }
}

void FramebufferManager::CopyToRealXFB(u32 xfbAddr, u32 fbStride, u32 fbHeight,
                                       const EFBRectangle& sourceRc, float Gamma)
{
  u8* xfb_in_ram = Memory::GetPointer(xfbAddr);
  if (!xfb_in_ram)
  {
    WARN_LOG(VIDEO, "Tried to copy to invalid XFB address");
    return;
  }

  TargetRectangle targetRc = g_renderer->ConvertEFBRectangle(sourceRc);
  TextureConverter::EncodeToRamYUYV(ResolveAndGetRenderTarget(sourceRc), targetRc, xfb_in_ram,
                                    sourceRc.GetWidth(), fbStride, fbHeight);
}

void FramebufferManager::SetFramebuffer(GLuint fb)
{
  glBindFramebuffer(GL_FRAMEBUFFER, fb != 0 ? fb : GetEFBFramebuffer());
}

void FramebufferManager::FramebufferTexture(GLenum target, GLenum attachment, GLenum textarget,
                                            GLuint texture, GLint level)
{
  if (textarget == GL_TEXTURE_2D_ARRAY || textarget == GL_TEXTURE_2D_MULTISAMPLE_ARRAY)
  {
    if (m_EFBLayers > 1)
      glFramebufferTexture(target, attachment, texture, level);
    else
      glFramebufferTextureLayer(target, attachment, texture, level, 0);
  }
  else
  {
    glFramebufferTexture2D(target, attachment, textarget, texture, level);
  }
}

// Apply AA if enabled
GLuint FramebufferManager::ResolveAndGetRenderTarget(const EFBRectangle& source_rect)
{
  return GetEFBColorTexture(source_rect);
}

GLuint FramebufferManager::ResolveAndGetDepthTarget(const EFBRectangle& source_rect)
{
  return GetEFBDepthTexture(source_rect);
}

void FramebufferManager::ReinterpretPixelData(unsigned int convtype)
{
  g_renderer->ResetAPIState();

  OpenGL_BindAttributelessVAO();

  GLuint src_texture = 0;

  // We aren't allowed to render and sample the same texture in one draw call,
  // so we have to create a new texture and overwrite it completely.
  // To not allocate one big texture every time, we've allocated two on
  // initialization and just swap them here:
  src_texture = m_efbColor;
  m_efbColor = m_efbColorSwap;
  m_efbColorSwap = src_texture;
  FramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_textureType, m_efbColor, 0);

  glViewport(0, 0, m_targetWidth, m_targetHeight);
  glActiveTexture(GL_TEXTURE9);
  glBindTexture(m_textureType, src_texture);
  g_sampler_cache->BindNearestSampler(9);

  m_pixel_format_shaders[convtype ? 1 : 0].Bind();
  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  glBindTexture(m_textureType, 0);

  g_renderer->RestoreAPIState();
}

XFBSource::~XFBSource()
{
  glDeleteTextures(1, &texture);
}

void XFBSource::DecodeToTexture(u32 xfbAddr, u32 fbWidth, u32 fbHeight)
{
  TextureConverter::DecodeToTexture(xfbAddr, fbWidth, fbHeight, texture);
}

void XFBSource::CopyEFB(float Gamma)
{
  g_renderer->ResetAPIState();

  // Copy EFB data to XFB and restore render target again
  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FramebufferManager::GetXFBFramebuffer());

  for (int i = 0; i < m_layers; i++)
  {
    // Bind EFB and texture layer
    glBindFramebuffer(GL_READ_FRAMEBUFFER, FramebufferManager::GetEFBFramebuffer(i));
    glFramebufferTextureLayer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture, 0, i);

    glBlitFramebuffer(0, 0, texWidth, texHeight, 0, 0, texWidth, texHeight, GL_COLOR_BUFFER_BIT,
                      GL_NEAREST);
  }

  // Return to EFB.
  FramebufferManager::SetFramebuffer(0);

  g_renderer->RestoreAPIState();
}

std::unique_ptr<XFBSourceBase> FramebufferManager::CreateXFBSource(unsigned int target_width,
                                                                   unsigned int target_height,
                                                                   unsigned int layers)
{
  GLuint texture;

  glGenTextures(1, &texture);

  glActiveTexture(GL_TEXTURE9);
  glBindTexture(GL_TEXTURE_2D_ARRAY, texture);
  glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 0);
  glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, target_width, target_height, layers, 0, GL_RGBA,
               GL_UNSIGNED_BYTE, nullptr);

  return std::make_unique<XFBSource>(texture, layers);
}

void FramebufferManager::GetTargetSize(unsigned int* width, unsigned int* height)
{
  *width = m_targetWidth;
  *height = m_targetHeight;
}

void FramebufferManager::PokeEFB(EFBAccessType type, const EfbPokeData* points, size_t num_points)
{
  g_renderer->ResetAPIState();

  if (type == POKE_Z)
  {
    glDepthMask(GL_TRUE);
    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_ALWAYS);
  }

  glBindVertexArray(m_EfbPokes_VAO);
  glBindBuffer(GL_ARRAY_BUFFER, m_EfbPokes_VBO);
  glBufferData(GL_ARRAY_BUFFER, sizeof(EfbPokeData) * num_points, points, GL_STREAM_DRAW);
  m_EfbPokes.Bind();
  glViewport(0, 0, m_targetWidth, m_targetHeight);
  glDrawArrays(GL_POINTS, 0, (GLsizei)num_points);

  g_renderer->RestoreAPIState();

  // TODO: Could just update the EFB cache with the new value
  ClearEFBCache();
}

}  // namespace OGL