ImGuiPalette.cc

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#include "ImGuiPalette.hh"
 
#include "ImGuiCpp.hh"
#include "ImGuiUtils.hh"
 
#include "VDP.hh"
 
#include "StringOp.hh"
#include "xrange.hh"
 
#include <imgui.h>
 
#include <cassert>
 
using namespace std::literals;
 
 
namespace openmsx {
 
static constexpr std::array<uint16_t, 16> fixedPalette = { // GRB
        0x000, 0x000, 0x611, 0x733,
        0x117, 0x327, 0x151, 0x627,
        0x171, 0x373, 0x661, 0x664,
        0x411, 0x265, 0x555, 0x777,
};
 
ImGuiPalette::ImGuiPalette(ImGuiManager& manager_)
        : ImGuiPart(manager_)
{
        customPalette = fixedPalette;
}
 
void ImGuiPalette::save(ImGuiTextBuffer& buf)
{
        savePersistent(buf, *this, persistentElements);
 
        buf.append("customPalette=");
        for (auto i : xrange(16)) {
                if (i) buf.append(",");
                buf.appendf("%d", customPalette[i]);
        }
        buf.append("\n");
}
 
void ImGuiPalette::loadLine(std::string_view name, zstring_view value)
{
        if (loadOnePersistent(name, value, *this, persistentElements)) {
                // already handled
        } else if (name == "customPalette") {
                int i = 0;
                for (auto s : StringOp::split_view(value, ',')) {
                        if (auto v = StringOp::stringTo<uint16_t>(s)) {
                                customPalette[i] = *v;
                        }
                        if (++i == 16) break;
                }
        }
}
 
static std::array<int, 3> extractRGB(uint16_t grb)
{
        auto r = (grb >> 4) & 7;
        auto g = (grb >> 8) & 7;
        auto b = (grb >> 0) & 7;
        return {r, g, b};
}
 
static void insertRGB(std::span<uint16_t, 16> msxPalette, unsigned index, std::array<int, 3> rgb)
{
        assert(index < 16);
        msxPalette[index] = narrow<int16_t>(((rgb[1] & 7) << 8) | ((rgb[0] & 7) << 4) | ((rgb[2] & 7) << 0));
}
 
uint32_t ImGuiPalette::toRGBA(uint16_t msxColor)
{
        auto [r, g, b] = extractRGB(msxColor);
        static constexpr float scale = 1.0f / 7.0f;
        return ImColor(float(r) * scale, float(g) * scale, float(b) * scale);
}
 
static bool coloredButton(const char* id, ImU32 color, ImVec2 size)
{
        bool result = false;
        auto col = ImGui::ColorConvertU32ToFloat4(color);
        im::StyleColor(ImGuiCol_Button,        col,
                       ImGuiCol_ButtonHovered, col,
                       ImGuiCol_ButtonActive,  col, [&]{
                result = ImGui::Button(id, size);
        });
        return result;
}
 
std::span<const uint16_t, 16> ImGuiPalette::getPalette(const VDP* vdp) const
{
        if (whichPalette == PALETTE_CUSTOM) {
                return customPalette;
        } else if (whichPalette == PALETTE_VDP && vdp) {
                return vdp->getPalette();
        } else {
                return fixedPalette;
        }
}
 
void ImGuiPalette::paint(MSXMotherBoard* motherBoard)
{
        if (!window.open) return;
        im::Window("Palette editor", window, [&]{
                VDP* vdp = motherBoard ? dynamic_cast<VDP*>(motherBoard->findDevice("VDP")) : nullptr; // TODO name based OK?
 
                im::Disabled(vdp == nullptr, [&]{
                        ImGui::RadioButton("VDP palette", &whichPalette, PALETTE_VDP);
                });
                ImGui::SameLine();
                ImGui::RadioButton("Custom palette", &whichPalette, PALETTE_CUSTOM);
                ImGui::SameLine();
                ImGui::RadioButton("Fixed palette", &whichPalette, PALETTE_FIXED);
 
                std::array<uint16_t, 16> paletteCopy;
                std::span<uint16_t, 16> palette = customPalette;
                bool disabled = (whichPalette == PALETTE_FIXED) ||
                                ((whichPalette == PALETTE_VDP) && !vdp);
                if (disabled) {
                        palette = std::span<uint16_t, 16>{const_cast<uint16_t*>(fixedPalette.data()), 16};
                } else if (whichPalette == PALETTE_VDP) {
                        ranges::copy(vdp->getPalette(), paletteCopy);
                        palette = paletteCopy;
                }
 
                im::Table("left/right", 2, [&]{
                        ImGui::TableSetupColumn("left",  ImGuiTableColumnFlags_WidthFixed, 200.0f);
                        ImGui::TableSetupColumn("right", ImGuiTableColumnFlags_WidthFixed, 150.0f);
 
                        if (ImGui::TableNextColumn()) { // left pane
                                im::Table("grid", 4, [&]{
                                        im::ID_for_range(16, [&](int i) {
                                                if (ImGui::TableNextColumn()) {
                                                        if (i == selectedColor) {
                                                                ImGui::TableSetBgColor(ImGuiTableBgTarget_CellBg, ImGui::GetColorU32(ImGuiCol_HeaderActive));
                                                        }
                                                        auto color = toRGBA(palette[i]);
                                                        if (coloredButton("", color, {44.0f, 30.0f})) {
                                                                selectedColor = i;
                                                        }
                                                }
                                        });
                                });
                        }
                        if (ImGui::TableNextColumn()) { // right pane
                                ImGui::StrCat("Color ", selectedColor);
                                ImGui::TextUnformatted(" "sv);
                                ImGui::SameLine();
                                coloredButton("##color", toRGBA(palette[selectedColor]), {150.0f, 30.0f});
                                ImGui::Spacing();
                                ImGui::Spacing();
 
                                im::Disabled(disabled, [&]{
                                        static constexpr std::array names = {"R"sv, "G"sv, "B"sv};
                                        auto rgb = extractRGB(palette[selectedColor]);
                                        im::ID_for_range(3, [&](int i) { // rgb sliders
                                                ImGui::AlignTextToFramePadding();
                                                ImGui::TextUnformatted(names[i]);
                                                ImGui::SameLine();
                                                im::StyleColor(
                                                        ImGuiCol_FrameBg,        static_cast<ImVec4>(ImColor::HSV(float(i) * (1.0f / 3.0f), 0.5f, 0.5f)),
                                                        ImGuiCol_FrameBgHovered, static_cast<ImVec4>(ImColor::HSV(float(i) * (1.0f / 3.0f), 0.6f, 0.5f)),
                                                        ImGuiCol_FrameBgActive,  static_cast<ImVec4>(ImColor::HSV(float(i) * (1.0f / 3.0f), 0.7f, 0.5f)),
                                                        ImGuiCol_SliderGrab,     static_cast<ImVec4>(ImColor::HSV(float(i) * (1.0f / 3.0f), 0.9f, 0.9f)), [&]{
                                                        ImGui::SetNextItemWidth(-FLT_MIN);
                                                        if (ImGui::SliderInt("##v", &rgb[i], 0, 7, "%d", ImGuiSliderFlags_AlwaysClamp)) {
                                                                assert(!disabled);
                                                                insertRGB(palette, selectedColor, rgb);
                                                                if (whichPalette == PALETTE_VDP) {
                                                                        auto time = motherBoard->getCurrentTime();
                                                                        vdp->setPalette(selectedColor, palette[selectedColor], time);
                                                                }
                                                        }
                                                });
                                        });
                                });
                        }
                });
        });
}
 
} // namespace openmsx