void render(ImDrawData* _drawData)
{
const ImGuiIO& io = ImGui::GetIO();
const float width = io.DisplaySize.x;
const float height = io.DisplaySize.y;
bgfx::setViewName(m_viewId, "ImGui");
bgfx::setViewMode(m_viewId, bgfx::ViewMode::Sequential);
const bgfx::HMD* hmd = bgfx::getHMD();
const bgfx::Caps* caps = bgfx::getCaps();
if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
{
float proj[16];
bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
static float time = 0.0f;
time += 0.05f;
const float dist = 10.0f;
const float offset0 = -proj[8] + (hmd->eye[0].viewOffset[0] / dist * proj[0]);
const float offset1 = -proj[8] + (hmd->eye[1].viewOffset[0] / dist * proj[0]);
float ortho[2][16];
const float viewOffset = width/4.0f;
const float viewWidth = width/2.0f;
bx::mtxOrtho(ortho[0], viewOffset, viewOffset + viewWidth, height, 0.0f, 0.0f, 1000.0f, offset0, caps->homogeneousDepth);
bx::mtxOrtho(ortho[1], viewOffset, viewOffset + viewWidth, height, 0.0f, 0.0f, 1000.0f, offset1, caps->homogeneousDepth);
bgfx::setViewTransform(m_viewId, NULL, ortho[0], BGFX_VIEW_STEREO, ortho[1]);
bgfx::setViewRect(m_viewId, 0, 0, hmd->width, hmd->height);
}
else
{
float ortho[16];
bx::mtxOrtho(ortho, 0.0f, width, height, 0.0f, 0.0f, 1000.0f, 0.0f, caps->homogeneousDepth);
bgfx::setViewTransform(m_viewId, NULL, ortho);
bgfx::setViewRect(m_viewId, 0, 0, uint16_t(width), uint16_t(height) );
}
// Render command lists
for (int32_t ii = 0, num = _drawData->CmdListsCount; ii < num; ++ii)
{
bgfx::TransientVertexBuffer tvb;
bgfx::TransientIndexBuffer tib;
const ImDrawList* drawList = _drawData->CmdLists[ii];
uint32_t numVertices = (uint32_t)drawList->VtxBuffer.size();
uint32_t numIndices = (uint32_t)drawList->IdxBuffer.size();
if (!checkAvailTransientBuffers(numVertices, m_decl, numIndices) )
{
// not enough space in transient buffer just quit drawing the rest...
break;
}
bgfx::allocTransientVertexBuffer(&tvb, numVertices, m_decl);
bgfx::allocTransientIndexBuffer(&tib, numIndices);
ImDrawVert* verts = (ImDrawVert*)tvb.data;
bx::memCopy(verts, drawList->VtxBuffer.begin(), numVertices * sizeof(ImDrawVert) );
ImDrawIdx* indices = (ImDrawIdx*)tib.data;
bx::memCopy(indices, drawList->IdxBuffer.begin(), numIndices * sizeof(ImDrawIdx) );
uint32_t offset = 0;
for (const ImDrawCmd* cmd = drawList->CmdBuffer.begin(), *cmdEnd = drawList->CmdBuffer.end(); cmd != cmdEnd; ++cmd)
{
if (cmd->UserCallback)
{
cmd->UserCallback(drawList, cmd);
}
else if (0 != cmd->ElemCount)
{
uint64_t state = 0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
| BGFX_STATE_MSAA
;
bgfx::TextureHandle th = m_texture;
bgfx::ProgramHandle program = m_program;
if (NULL != cmd->TextureId)
{
union { ImTextureID ptr; struct { bgfx::TextureHandle handle; uint8_t flags; uint8_t mip; } s; } texture = { cmd->TextureId };
state |= 0 != (IMGUI_FLAGS_ALPHA_BLEND & texture.s.flags)
? BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA)
: BGFX_STATE_NONE
;
th = texture.s.handle;
if (0 != texture.s.mip)
{
const float lodEnabled[4] = { float(texture.s.mip), 1.0f, 0.0f, 0.0f };
bgfx::setUniform(u_imageLodEnabled, lodEnabled);
program = m_imageProgram;
}
}
else
{
state |= BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA);
}
const uint16_t xx = uint16_t(bx::fmax(cmd->ClipRect.x, 0.0f) );
const uint16_t yy = uint16_t(bx::fmax(cmd->ClipRect.y, 0.0f) );
bgfx::setScissor(xx, yy
, uint16_t(bx::fmin(cmd->ClipRect.z, 65535.0f)-xx)
, uint16_t(bx::fmin(cmd->ClipRect.w, 65535.0f)-yy)
);
bgfx::setState(state);
bgfx::setTexture(0, s_tex, th);
bgfx::setVertexBuffer(0, &tvb, 0, numVertices);
bgfx::setIndexBuffer(&tib, offset, cmd->ElemCount);
bgfx::submit(cmd->ViewId, program);
}
offset += cmd->ElemCount;
}
}
}
void render(ImDrawData* _drawData)
{
const ImGuiIO& io = ImGui::GetIO();
const float width = io.DisplaySize.x;
const float height = io.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, num = _drawData->CmdListsCount; ii < num; ++ii)
{
bgfx::TransientVertexBuffer tvb;
bgfx::TransientIndexBuffer tib;
const ImDrawList* drawList = _drawData->CmdLists[ii];
uint32_t numVertices = (uint32_t)drawList->VtxBuffer.size();
uint32_t numIndices = (uint32_t)drawList->IdxBuffer.size();
if (!checkAvailTransientBuffers(numVertices, m_decl, numIndices) )
{
// not enough space in transient buffer just quit drawing the rest...
break;
}
bgfx::allocTransientVertexBuffer(&tvb, numVertices, m_decl);
bgfx::allocTransientIndexBuffer(&tib, numIndices);
ImDrawVert* verts = (ImDrawVert*)tvb.data;
memcpy(verts, drawList->VtxBuffer.begin(), numVertices * sizeof(ImDrawVert) );
ImDrawIdx* indices = (ImDrawIdx*)tib.data;
memcpy(indices, drawList->IdxBuffer.begin(), numIndices * sizeof(ImDrawIdx) );
uint32_t offset = 0;
for (const ImDrawCmd* cmd = drawList->CmdBuffer.begin(), *cmdEnd = drawList->CmdBuffer.end(); cmd != cmdEnd; ++cmd)
{
if (cmd->UserCallback)
{
cmd->UserCallback(drawList, cmd);
}
else if (0 != cmd->ElemCount)
{
uint64_t state = 0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
| BGFX_STATE_MSAA
;
bgfx::TextureHandle th = m_texture;
bgfx::ProgramHandle program = m_program;
if (NULL != cmd->TextureId)
{
union { ImTextureID ptr; struct { bgfx::TextureHandle handle; uint8_t flags; uint8_t mip; } s; } texture = { cmd->TextureId };
state |= 0 != (IMGUI_FLAGS_ALPHA_BLEND & texture.s.flags)
? BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA)
: BGFX_STATE_NONE
;
th = texture.s.handle;
if (0 != texture.s.mip)
{
extern bgfx::ProgramHandle imguiGetImageProgram(uint8_t _mip);
program = imguiGetImageProgram(texture.s.mip);
}
}
else
{
state |= BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA);
}
const uint16_t xx = uint16_t(bx::fmax(cmd->ClipRect.x, 0.0f) );
const uint16_t yy = uint16_t(bx::fmax(cmd->ClipRect.y, 0.0f) );
bgfx::setScissor(xx, yy
, uint16_t(bx::fmin(cmd->ClipRect.z, 65535.0f)-xx)
, uint16_t(bx::fmin(cmd->ClipRect.w, 65535.0f)-yy)
);
bgfx::setState(state);
bgfx::setTexture(0, s_tex, th);
bgfx::setVertexBuffer(&tvb, 0, numVertices);
bgfx::setIndexBuffer(&tib, offset, cmd->ElemCount);
bgfx::submit(cmd->ViewId, program);
}
offset += cmd->ElemCount;
}
}
}
