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/*
* Copyright 2014-2015 Daniel Collin. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#include <bgfx.h>
#include <bx/allocator.h>
#include <bx/fpumath.h>
#include <ocornut-imgui/imgui.h>
#include "imgui.h"
#include "ocornut_imgui.h"
#include <stb/stb_image.c>
#include "vs_ocornut_imgui.bin.h"
#include "fs_ocornut_imgui.bin.h"
struct OcornutImguiContext
{
static void* memAlloc(size_t _size);
static void memFree(void* _ptr);
static void renderDrawLists(ImDrawList** const _lists, int _count);
void render(ImDrawList** const _lists, int _count)
{
const float width = ImGui::GetIO().DisplaySize.x;
const float height = ImGui::GetIO().DisplaySize.y;
float ortho[16];
bx::mtxOrtho(ortho, 0.0f, width, height, 0.0f, -1.0f, 1.0f);
bgfx::setViewTransform(m_viewId, NULL, ortho);
// Render command lists
for (int32_t ii = 0; ii < _count; ++ii)
{
bgfx::TransientVertexBuffer tvb;
uint32_t vtx_size = 0;
const ImDrawList* cmd_list = _lists[ii];
const ImDrawVert* vtx_buffer = cmd_list->vtx_buffer.begin();
const ImDrawCmd* pcmd_begin = cmd_list->commands.begin();
const ImDrawCmd* pcmd_end = cmd_list->commands.end();
for (const ImDrawCmd* pcmd = pcmd_begin; pcmd != pcmd_end; pcmd++)
{
vtx_size += (uint32_t)pcmd->vtx_count;
}
if (!bgfx::checkAvailTransientVertexBuffer(vtx_size, m_decl))
{
// not enough space in transient buffer just quit drawing the rest...
break;
}
bgfx::allocTransientVertexBuffer(&tvb, vtx_size, m_decl);
ImDrawVert* verts = (ImDrawVert*)tvb.data;
memcpy(verts, vtx_buffer, vtx_size * sizeof(ImDrawVert));
uint32_t vtx_offset = 0;
for (const ImDrawCmd* pcmd = pcmd_begin; pcmd != pcmd_end; pcmd++)
{
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
| BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA)
| BGFX_STATE_MSAA
);
bgfx::setScissor(uint16_t(pcmd->clip_rect.x)
, uint16_t(pcmd->clip_rect.y)
, uint16_t(pcmd->clip_rect.z-pcmd->clip_rect.x)
, uint16_t(pcmd->clip_rect.w-pcmd->clip_rect.y)
);
bgfx::setTexture(0, s_tex, m_texture);
bgfx::setVertexBuffer(&tvb, vtx_offset, pcmd->vtx_count);
bgfx::setProgram(m_program);
bgfx::submit(m_viewId);
vtx_offset += pcmd->vtx_count;
}
}
}
void create(const void* _data, uint32_t _size, float _fontSize, bx::AllocatorI* _allocator)
{
m_viewId = 255;
m_allocator = _allocator;
ImGuiIO& io = ImGui::GetIO();
io.RenderDrawListsFn = renderDrawLists;
if (NULL != m_allocator)
{
io.MemAllocFn = memAlloc;
io.MemFreeFn = memFree;
}
io.DisplaySize = ImVec2(1280.0f, 720.0f);
io.DeltaTime = 1.0f / 60.0f;
io.IniFilename = NULL;
// io.PixelCenterOffset = bgfx::RendererType::Direct3D9 == bgfx::getRendererType() ? -0.5f : 0.0f;
const bgfx::Memory* vsmem;
const bgfx::Memory* fsmem;
switch (bgfx::getRendererType())
{
case bgfx::RendererType::Direct3D9:
vsmem = bgfx::makeRef(vs_ocornut_imgui_dx9, sizeof(vs_ocornut_imgui_dx9));
fsmem = bgfx::makeRef(fs_ocornut_imgui_dx9, sizeof(fs_ocornut_imgui_dx9));
break;
case bgfx::RendererType::Direct3D11:
case bgfx::RendererType::Direct3D12:
vsmem = bgfx::makeRef(vs_ocornut_imgui_dx11, sizeof(vs_ocornut_imgui_dx11));
fsmem = bgfx::makeRef(fs_ocornut_imgui_dx11, sizeof(fs_ocornut_imgui_dx11));
break;
default:
vsmem = bgfx::makeRef(vs_ocornut_imgui_glsl, sizeof(vs_ocornut_imgui_glsl));
fsmem = bgfx::makeRef(fs_ocornut_imgui_glsl, sizeof(fs_ocornut_imgui_glsl));
break;
}
bgfx::ShaderHandle vsh = bgfx::createShader(vsmem);
bgfx::ShaderHandle fsh = bgfx::createShader(fsmem);
m_program = bgfx::createProgram(vsh, fsh, true);
m_decl
.begin()
.add(bgfx::Attrib::Position, 2, bgfx::AttribType::Float)
.add(bgfx::Attrib::TexCoord0, 2, bgfx::AttribType::Float)
.add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true)
.end();
s_tex = bgfx::createUniform("s_tex", bgfx::UniformType::Uniform1i);
uint8_t* data;
int32_t width;
int32_t height;
void* font = ImGui::MemAlloc(_size);
memcpy(font, _data, _size);
io.Fonts->AddFontFromMemoryTTF(font, _size, _fontSize);
io.Fonts->GetTexDataAsRGBA32(&data, &width, &height);
m_texture = bgfx::createTexture2D( (uint16_t)width
, (uint16_t)height
, 1
, bgfx::TextureFormat::BGRA8
, BGFX_TEXTURE_MIN_POINT | BGFX_TEXTURE_MAG_POINT
, bgfx::copy(data, width*height*4)
);
ImGuiStyle& style = ImGui::GetStyle();
style.FrameRounding = 4.0f;
}
void destroy()
{
ImGui::Shutdown();
bgfx::destroyUniform(s_tex);
bgfx::destroyTexture(m_texture);
bgfx::destroyProgram(m_program);
m_allocator = NULL;
}
void beginFrame(int32_t _mx, int32_t _my, uint8_t _button, int _width, int _height, char _inputChar, uint8_t _viewId)
{
m_viewId = _viewId;
ImGuiIO& io = ImGui::GetIO();
io.AddInputCharacter(_inputChar & 0x7f); // ASCII or GTFO! :)
io.DisplaySize = ImVec2((float)_width, (float)_height);
io.DeltaTime = 1.0f / 60.0f;
io.MousePos = ImVec2((float)_mx, (float)_my);
io.MouseDown[0] = 0 != (_button & IMGUI_MBUT_LEFT);
ImGui::NewFrame();
//ImGui::ShowTestWindow(); //Debug only.
}
void endFrame()
{
ImGui::Render();
}
bx::AllocatorI* m_allocator;
bgfx::VertexDecl m_decl;
bgfx::ProgramHandle m_program;
bgfx::TextureHandle m_texture;
bgfx::UniformHandle s_tex;
uint8_t m_viewId;
};
static OcornutImguiContext s_ctx;
void* OcornutImguiContext::memAlloc(size_t _size)
{
return BX_ALLOC(s_ctx.m_allocator, _size);
}
void OcornutImguiContext::memFree(void* _ptr)
{
BX_FREE(s_ctx.m_allocator, _ptr);
}
void OcornutImguiContext::renderDrawLists(ImDrawList** const _lists, int _count)
{
s_ctx.render(_lists, _count);
}
void IMGUI_create(const void* _data, uint32_t _size, float _fontSize, bx::AllocatorI* _allocator)
{
s_ctx.create(_data, _size, _fontSize, _allocator);
}
void IMGUI_destroy()
{
s_ctx.destroy();
}
void IMGUI_beginFrame(int32_t _mx, int32_t _my, uint8_t _button, int _width, int _height, char _inputChar, uint8_t _viewId)
{
s_ctx.beginFrame(_mx, _my, _button, _width, _height, _inputChar, _viewId);
}
void IMGUI_endFrame()
{
s_ctx.endFrame();
}
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