// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include "core/hw/gpu.h"
#include "video_core/video_core.h"
#include "video_core/renderer_opengl/renderer_opengl.h"
#include "core/mem_map.h"
/// RendererOpenGL constructor
RendererOpenGL::RendererOpenGL() {
memset(m_fbo, 0, sizeof(m_fbo));
memset(m_fbo_rbo, 0, sizeof(m_fbo_rbo));
memset(m_fbo_depth_buffers, 0, sizeof(m_fbo_depth_buffers));
m_resolution_width = max(VideoCore::kScreenTopWidth, VideoCore::kScreenBottomWidth);
m_resolution_height = VideoCore::kScreenTopHeight + VideoCore::kScreenBottomHeight;
m_xfb_texture_top = 0;
m_xfb_texture_bottom = 0;
m_xfb_top = 0;
m_xfb_bottom = 0;
}
/// RendererOpenGL destructor
RendererOpenGL::~RendererOpenGL() {
}
/// Swap buffers (render frame)
void RendererOpenGL::SwapBuffers() {
m_render_window->MakeCurrent();
// EFB->XFB copy
// TODO(bunnei): This is a hack and does not belong here. The copy should be triggered by some
// register write We're also treating both framebuffers as a single one in OpenGL.
common::Rect framebuffer_size(0, 0, m_resolution_width, m_resolution_height);
RenderXFB(framebuffer_size, framebuffer_size);
// XFB->Window copy
RenderFramebuffer();
// Swap buffers
m_render_window->PollEvents();
m_render_window->SwapBuffers();
// Switch back to EFB and clear
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbo[kFramebuffer_EFB]);
}
/**
* Helper function to flip framebuffer from left-to-right to top-to-bottom
* @param in Pointer to input raw framebuffer in V/RAM
* @param out Pointer to output buffer with flipped framebuffer
* @todo Early on hack... I'd like to find a more efficient way of doing this /bunnei
*/
void RendererOpenGL::FlipFramebuffer(const u8* in, u8* out) {
int in_coord = 0;
for (int x = 0; x < VideoCore::kScreenTopWidth; x++) {
for (int y = VideoCore::kScreenTopHeight-1; y >= 0; y--) {
// TODO: Properly support other framebuffer formats
int out_coord = (x + y * VideoCore::kScreenTopWidth) * 3;
out[out_coord] = in[in_coord]; // blue?
out[out_coord + 1] = in[in_coord + 1]; // green?
out[out_coord + 2] = in[in_coord + 2]; // red?
in_coord+=3;
}
}
}
/**
* Renders external framebuffer (XFB)
* @param src_rect Source rectangle in XFB to copy
* @param dst_rect Destination rectangle in output framebuffer to copy to
*/
void RendererOpenGL::RenderXFB(const common::Rect& src_rect, const common::Rect& dst_rect) {
const auto& framebuffer_top = GPU::g_regs.framebuffer_config[0];
const auto& framebuffer_sub = GPU::g_regs.framebuffer_config[1];
const u32 active_fb_top = (framebuffer_top.active_fb == 1)
? Memory::PhysicalToVirtualAddress(framebuffer_top.address_left2)
: Memory::PhysicalToVirtualAddress(framebuffer_top.address_left1);
const u32 active_fb_sub = (framebuffer_sub.active_fb == 1)
? Memory::PhysicalToVirtualAddress(framebuffer_sub.address_left2)
: Memory::PhysicalToVirtualAddress(framebuffer_sub.address_left1);
DEBUG_LOG(GPU, "RenderXFB: 0x%08x bytes from 0x%08x(%dx%d), fmt %x",
framebuffer_top.stride * framebuffer_top.height,
active_fb_top, (int)framebuffer_top.width,
(int)framebuffer_top.height, (int)framebuffer_top.format);
// TODO: This should consider the GPU registers for framebuffer width, height and stride.
FlipFramebuffer(Memory::GetPointer(active_fb_top), m_xfb_top_flipped);
FlipFramebuffer(Memory::GetPointer(active_fb_sub), m_xfb_bottom_flipped);
// Blit the top framebuffer
// ------------------------
// Update textures with contents of XFB in RAM - top
glBindTexture(GL_TEXTURE_2D, m_xfb_texture_top);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, VideoCore::kScreenTopWidth, VideoCore::kScreenTopHeight,
GL_BGR, GL_UNSIGNED_BYTE, m_xfb_top_flipped);
glBindTexture(GL_TEXTURE_2D, 0);
// Render target is destination framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbo[kFramebuffer_VirtualXFB]);
glViewport(0, 0, VideoCore::kScreenTopWidth, VideoCore::kScreenTopHeight);
// Render source is our EFB
glBindFramebuffer(GL_READ_FRAMEBUFFER, m_xfb_top);
glReadBuffer(GL_COLOR_ATTACHMENT0);
// Blit
glBlitFramebuffer(src_rect.x0_, src_rect.y0_, src_rect.x1_, src_rect.y1_,
dst_rect.x0_, dst_rect.y1_, dst_rect.x1_, dst_rect.y0_,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
// Blit the bottom framebuffer
// ---------------------------
// Update textures with contents of XFB in RAM - bottom
glBindTexture(GL_TEXTURE_2D, m_xfb_texture_bottom);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, VideoCore::kScreenTopWidth, VideoCore::kScreenTopHeight,
GL_BGR, GL_UNSIGNED_BYTE, m_xfb_bottom_flipped);
glBindTexture(GL_TEXTURE_2D, 0);
// Render target is destination framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbo[kFramebuffer_VirtualXFB]);
glViewport(0, 0,
VideoCore::kScreenBottomWidth, VideoCore::kScreenBottomHeight);
// Render source is our EFB
glBindFramebuffer(GL_READ_FRAMEBUFFER, m_xfb_bottom);
glReadBuffer(GL_COLOR_ATTACHMENT0);
// Blit
int offset = (VideoCore::kScreenTopWidth - VideoCore::kScreenBottomWidth) / 2;
glBlitFramebuffer(0,0, VideoCore::kScreenBottomWidth, VideoCore::kScreenBottomHeight,
offset, VideoCore::kScreenBottomHeight, VideoCore::kScreenBottomWidth + offset, 0,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
}
/// Initialize the FBO
void RendererOpenGL::InitFramebuffer() {
// TODO(bunnei): This should probably be implemented with the top screen and bottom screen as
// separate framebuffers
// Init the FBOs
// -------------
glGenFramebuffers(kMaxFramebuffers, m_fbo); // Generate primary framebuffer
glGenRenderbuffers(kMaxFramebuffers, m_fbo_rbo); // Generate primary RBOs
glGenRenderbuffers(kMaxFramebuffers, m_fbo_depth_buffers); // Generate primary depth buffer
for (int i = 0; i < kMaxFramebuffers; i++) {
// Generate color buffer storage
glBindRenderbuffer(GL_RENDERBUFFER, m_fbo_rbo[i]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, VideoCore::kScreenTopWidth,
VideoCore::kScreenTopHeight + VideoCore::kScreenBottomHeight);
// Generate depth buffer storage
glBindRenderbuffer(GL_RENDERBUFFER, m_fbo_depth_buffers[i]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT32, VideoCore::kScreenTopWidth,
VideoCore::kScreenTopHeight + VideoCore::kScreenBottomHeight);
// Attach the buffers
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbo[i]);
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, m_fbo_depth_buffers[i]);
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, m_fbo_rbo[i]);
// Check for completeness
if (GL_FRAMEBUFFER_COMPLETE == glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER)) {
NOTICE_LOG(RENDER, "framebuffer(%d) initialized ok", i);
} else {
ERROR_LOG(RENDER, "couldn't create OpenGL frame buffer");
exit(1);
}
}
glBindFramebuffer(GL_FRAMEBUFFER, 0); // Unbind our frame buffer(s)
// Initialize framebuffer textures
// -------------------------------
// Create XFB textures
glGenTextures(1, &m_xfb_texture_top);
glGenTextures(1, &m_xfb_texture_bottom);
// Alocate video memorry for XFB textures
glBindTexture(GL_TEXTURE_2D, m_xfb_texture_top);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, VideoCore::kScreenTopWidth, VideoCore::kScreenTopHeight,
0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
glBindTexture(GL_TEXTURE_2D, m_xfb_texture_bottom);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, VideoCore::kScreenTopWidth, VideoCore::kScreenTopHeight,
0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
// Create the FBO and attach color/depth textures
glGenFramebuffers(1, &m_xfb_top); // Generate framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_xfb_top);
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
m_xfb_texture_top, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glGenFramebuffers(1, &m_xfb_bottom); // Generate framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_xfb_bottom);
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
m_xfb_texture_bottom, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
/// Blit the FBO to the OpenGL default framebuffer
void RendererOpenGL::RenderFramebuffer() {
// Render target is default framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glViewport(0, 0, m_resolution_width, m_resolution_height);
// Render source is our XFB
glBindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo[kFramebuffer_VirtualXFB]);
glReadBuffer(GL_COLOR_ATTACHMENT0);
// Blit
glBlitFramebuffer(0, 0, m_resolution_width, m_resolution_height, 0, 0, m_resolution_width,
m_resolution_height, GL_COLOR_BUFFER_BIT, GL_LINEAR);
// Update the FPS count
UpdateFramerate();
// Rebind EFB
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbo[kFramebuffer_EFB]);
m_current_frame++;
}
/// Updates the framerate
void RendererOpenGL::UpdateFramerate() {
}
/**
* Set the emulator window to use for renderer
* @param window EmuWindow handle to emulator window to use for rendering
*/
void RendererOpenGL::SetWindow(EmuWindow* window) {
m_render_window = window;
}
/// Initialize the renderer
void RendererOpenGL::Init() {
m_render_window->MakeCurrent();
glShadeModel(GL_SMOOTH);
glStencilFunc(GL_ALWAYS, 0, 0);
glBlendFunc(GL_ONE, GL_ONE);
glViewport(0, 0, m_resolution_width, m_resolution_height);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glDepthFunc(GL_LEQUAL);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glDisable(GL_STENCIL_TEST);
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, m_resolution_width, m_resolution_height);
glClearDepth(1.0f);
GLenum err = glewInit();
if (GLEW_OK != err) {
ERROR_LOG(RENDER, "Failed to initialize GLEW! Error message: \"%s\". Exiting...",
glewGetErrorString(err));
exit(-1);
}
// Initialize everything else
// --------------------------
InitFramebuffer();
NOTICE_LOG(RENDER, "GL_VERSION: %s\n", glGetString(GL_VERSION));
}
/// Shutdown the renderer
void RendererOpenGL::ShutDown() {
}
