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Kelsidavis-WoWee/tools/editor/transform_gizmo.cpp
Kelsi 98f2a6c3bf fix(gizmo): hide on NaN target instead of building NaN geometry 
setTarget previously stored the position raw, then updateBuffers
ran glm::normalize on axis offsets. NaN target → NaN normalized
axes → NaN gizmo vertices → Vulkan validation drops the whole
draw and the gizmo is invisible regardless of target value.

Hide the gizmo upfront so the user sees no gizmo (which is the
intent of the NaN handling) without leaking garbage into the
vertex buffer.
2026-05-06 08:01:23 -07:00

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#include "transform_gizmo.hpp"
#include "rendering/vk_context.hpp"
#include "rendering/vk_shader.hpp"
#include "core/logger.hpp"
#include <cstring>
#include <cmath>
namespace wowee {
namespace editor {
TransformGizmo::TransformGizmo() = default;
TransformGizmo::~TransformGizmo() { shutdown(); }
bool TransformGizmo::initialize(rendering::VkContext* ctx, VkRenderPass renderPass,
VkDescriptorSetLayout perFrameLayout) {
vkCtx_ = ctx;
renderPass_ = renderPass;
perFrameLayout_ = perFrameLayout;
return createPipeline();
}
void TransformGizmo::shutdown() {
if (!vkCtx_) return;
if (vertexBuffer_) {
vmaDestroyBuffer(vkCtx_->getAllocator(), vertexBuffer_, vertexAlloc_);
vertexBuffer_ = VK_NULL_HANDLE;
}
if (pipeline_) { vkDestroyPipeline(vkCtx_->getDevice(), pipeline_, nullptr); pipeline_ = VK_NULL_HANDLE; }
if (pipelineLayout_) { vkDestroyPipelineLayout(vkCtx_->getDevice(), pipelineLayout_, nullptr); pipelineLayout_ = VK_NULL_HANDLE; }
vkCtx_ = nullptr;
}
void TransformGizmo::setTarget(const glm::vec3& position, float scale) {
// Hide the gizmo on a NaN target. updateBuffers calls glm::normalize on
// axis offsets — non-finite targetPos_ would propagate NaN into the
// gizmo geometry and Vulkan validation would drop the whole batch.
if (!std::isfinite(position.x) || !std::isfinite(position.y) ||
!std::isfinite(position.z) || !std::isfinite(scale) || scale <= 0.0f) {
visible_ = false;
return;
}
targetPos_ = position;
targetScale_ = scale;
visible_ = true;
updateBuffers();
}
void TransformGizmo::beginDrag(const glm::vec2& screenPos) {
dragging_ = true;
dragStart_ = screenPos;
dragCurrent_ = screenPos;
moveDelta_ = glm::vec3(0);
rotateDelta_ = glm::vec3(0);
scaleDelta_ = 0.0f;
}
void TransformGizmo::updateDrag(const glm::vec2& screenPos, const rendering::Camera& camera,
float screenW, float screenH) {
if (!dragging_) return;
glm::vec2 delta = screenPos - dragCurrent_;
dragCurrent_ = screenPos;
float sensitivity = 1.0f;
if (mode_ == TransformMode::Move) {
glm::vec3 right = camera.getRight();
glm::vec3 forward = camera.getForward();
forward.z = 0; forward = glm::normalize(forward);
if (axis_ == TransformAxis::X || axis_ == TransformAxis::All)
moveDelta_ += right * delta.x * sensitivity;
if (axis_ == TransformAxis::Y || axis_ == TransformAxis::All)
moveDelta_ -= forward * delta.y * sensitivity;
if (axis_ == TransformAxis::Z)
moveDelta_.z -= delta.y * sensitivity;
} else if (mode_ == TransformMode::Rotate) {
float rotSpeed = 0.5f;
if (axis_ == TransformAxis::Z || axis_ == TransformAxis::All)
rotateDelta_.z += delta.x * rotSpeed;
if (axis_ == TransformAxis::X)
rotateDelta_.x += delta.y * rotSpeed;
if (axis_ == TransformAxis::Y)
rotateDelta_.y += delta.y * rotSpeed;
} else if (mode_ == TransformMode::Scale) {
scaleDelta_ += delta.x * 0.01f;
}
(void)screenW; (void)screenH;
}
void TransformGizmo::endDrag() {
dragging_ = false;
}
void TransformGizmo::updateBuffers() {
if (!vkCtx_ || !visible_) return;
if (vertexBuffer_) {
vmaDestroyBuffer(vkCtx_->getAllocator(), vertexBuffer_, vertexAlloc_);
vertexBuffer_ = VK_NULL_HANDLE;
}
std::vector<GizmoVertex> verts;
float len = 15.0f * targetScale_;
float tip = 3.0f * targetScale_;
float w = 0.8f * targetScale_;
glm::vec3 p = targetPos_;
auto addLine = [&](glm::vec3 a, glm::vec3 b, float r, float g, float bl, float alpha) {
// Thick line as thin quad
glm::vec3 dir = glm::normalize(b - a);
glm::vec3 up(0,0,1);
if (std::abs(glm::dot(dir, up)) > 0.99f) up = glm::vec3(1,0,0);
glm::vec3 side = glm::normalize(glm::cross(dir, up)) * w * 0.5f;
GizmoVertex v;
v.color[0] = r; v.color[1] = g; v.color[2] = bl; v.color[3] = alpha;
v.pos[0] = a.x+side.x; v.pos[1] = a.y+side.y; v.pos[2] = a.z+side.z; verts.push_back(v);
v.pos[0] = a.x-side.x; v.pos[1] = a.y-side.y; v.pos[2] = a.z-side.z; verts.push_back(v);
v.pos[0] = b.x+side.x; v.pos[1] = b.y+side.y; v.pos[2] = b.z+side.z; verts.push_back(v);
v.pos[0] = b.x+side.x; v.pos[1] = b.y+side.y; v.pos[2] = b.z+side.z; verts.push_back(v);
v.pos[0] = a.x-side.x; v.pos[1] = a.y-side.y; v.pos[2] = a.z-side.z; verts.push_back(v);
v.pos[0] = b.x-side.x; v.pos[1] = b.y-side.y; v.pos[2] = b.z-side.z; verts.push_back(v);
};
auto addArrowhead = [&](glm::vec3 base, glm::vec3 tipPt, float r, float g, float bl) {
glm::vec3 dir = glm::normalize(tipPt - base);
glm::vec3 up(0,0,1);
if (std::abs(glm::dot(dir, up)) > 0.99f) up = glm::vec3(1,0,0);
glm::vec3 s1 = glm::normalize(glm::cross(dir, up)) * tip * 0.4f;
glm::vec3 s2 = glm::normalize(glm::cross(dir, s1)) * tip * 0.4f;
GizmoVertex v;
v.color[0] = r; v.color[1] = g; v.color[2] = bl; v.color[3] = 1.0f;
// 4 faces
auto tri = [&](glm::vec3 a, glm::vec3 b, glm::vec3 c) {
v.pos[0]=a.x; v.pos[1]=a.y; v.pos[2]=a.z; verts.push_back(v);
v.pos[0]=b.x; v.pos[1]=b.y; v.pos[2]=b.z; verts.push_back(v);
v.pos[0]=c.x; v.pos[1]=c.y; v.pos[2]=c.z; verts.push_back(v);
};
tri(tipPt, base+s1, base+s2);
tri(tipPt, base+s2, base-s1);
tri(tipPt, base-s1, base-s2);
tri(tipPt, base-s2, base+s1);
};
bool showMove = (mode_ == TransformMode::Move || mode_ == TransformMode::None);
bool showRot = (mode_ == TransformMode::Rotate);
bool showScale = (mode_ == TransformMode::Scale);
float xAlpha = (axis_ == TransformAxis::X || axis_ == TransformAxis::All) ? 1.0f : 0.3f;
float yAlpha = (axis_ == TransformAxis::Y || axis_ == TransformAxis::All) ? 1.0f : 0.3f;
float zAlpha = (axis_ == TransformAxis::Z || axis_ == TransformAxis::All) ? 1.0f : 0.3f;
if (showMove || showRot) {
// X axis - Red
addLine(p, p + glm::vec3(len, 0, 0), 1, 0.2f, 0.2f, xAlpha);
addArrowhead(p + glm::vec3(len, 0, 0), p + glm::vec3(len + tip, 0, 0), 1, 0.2f, 0.2f);
// Y axis - Green
addLine(p, p + glm::vec3(0, len, 0), 0.2f, 1, 0.2f, yAlpha);
addArrowhead(p + glm::vec3(0, len, 0), p + glm::vec3(0, len + tip, 0), 0.2f, 1, 0.2f);
// Z axis - Blue
addLine(p, p + glm::vec3(0, 0, len), 0.3f, 0.3f, 1, zAlpha);
addArrowhead(p + glm::vec3(0, 0, len), p + glm::vec3(0, 0, len + tip), 0.3f, 0.3f, 1);
}
if (showScale) {
// Scale indicator: box at each axis end
float bs = tip * 0.5f;
auto addBox = [&](glm::vec3 c, float r, float g, float bl) {
// Simple cube from 12 triangles
GizmoVertex v; v.color[0]=r; v.color[1]=g; v.color[2]=bl; v.color[3]=1;
auto face = [&](glm::vec3 a, glm::vec3 b, glm::vec3 cc, glm::vec3 d) {
v.pos[0]=a.x;v.pos[1]=a.y;v.pos[2]=a.z;verts.push_back(v);
v.pos[0]=b.x;v.pos[1]=b.y;v.pos[2]=b.z;verts.push_back(v);
v.pos[0]=cc.x;v.pos[1]=cc.y;v.pos[2]=cc.z;verts.push_back(v);
v.pos[0]=cc.x;v.pos[1]=cc.y;v.pos[2]=cc.z;verts.push_back(v);
v.pos[0]=d.x;v.pos[1]=d.y;v.pos[2]=d.z;verts.push_back(v);
v.pos[0]=a.x;v.pos[1]=a.y;v.pos[2]=a.z;verts.push_back(v);
};
face(c+glm::vec3(-bs,-bs,bs),c+glm::vec3(bs,-bs,bs),c+glm::vec3(bs,bs,bs),c+glm::vec3(-bs,bs,bs));
face(c+glm::vec3(-bs,-bs,-bs),c+glm::vec3(-bs,bs,-bs),c+glm::vec3(bs,bs,-bs),c+glm::vec3(bs,-bs,-bs));
};
addLine(p, p + glm::vec3(len, 0, 0), 1, 0.5f, 0, 1);
addBox(p + glm::vec3(len, 0, 0), 1, 0.5f, 0);
addLine(p, p + glm::vec3(0, len, 0), 0.5f, 1, 0, 1);
addBox(p + glm::vec3(0, len, 0), 0.5f, 1, 0);
addLine(p, p + glm::vec3(0, 0, len), 0, 0.5f, 1, 1);
addBox(p + glm::vec3(0, 0, len), 0, 0.5f, 1);
}
if (verts.empty()) return;
vertexCount_ = static_cast<uint32_t>(verts.size());
VkBufferCreateInfo bufInfo{};
bufInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
bufInfo.size = verts.size() * sizeof(GizmoVertex);
bufInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
VmaAllocationCreateInfo allocInfo{};
allocInfo.usage = VMA_MEMORY_USAGE_CPU_TO_GPU;
allocInfo.flags = VMA_ALLOCATION_CREATE_MAPPED_BIT;
VmaAllocationInfo mapInfo{};
if (vmaCreateBuffer(vkCtx_->getAllocator(), &bufInfo, &allocInfo,
&vertexBuffer_, &vertexAlloc_, &mapInfo) == VK_SUCCESS) {
std::memcpy(mapInfo.pMappedData, verts.data(), verts.size() * sizeof(GizmoVertex));
}
}
void TransformGizmo::render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet) {
if (!visible_ || !vertexBuffer_ || vertexCount_ == 0 || !pipeline_) return;
vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline_);
vkCmdBindDescriptorSets(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout_,
0, 1, &perFrameSet, 0, nullptr);
VkDeviceSize offset = 0;
vkCmdBindVertexBuffers(cmd, 0, 1, &vertexBuffer_, &offset);
vkCmdDraw(cmd, vertexCount_, 1, 0, 0);
}
bool TransformGizmo::createPipeline() {
VkDevice dev = vkCtx_->getDevice();
VkPipelineLayoutCreateInfo layoutInfo{};
layoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
layoutInfo.setLayoutCount = 1;
layoutInfo.pSetLayouts = &perFrameLayout_;
if (vkCreatePipelineLayout(dev, &layoutInfo, nullptr, &pipelineLayout_) != VK_SUCCESS)
return false;
rendering::VkShaderModule vertMod, fragMod;
if (!vertMod.loadFromFile(dev, "assets/shaders/editor_water.vert.spv") ||
!fragMod.loadFromFile(dev, "assets/shaders/editor_water.frag.spv")) {
LOG_WARNING("Gizmo shaders not found");
return true;
}
VkPipelineShaderStageCreateInfo stages[2] = { vertMod.stageInfo(VK_SHADER_STAGE_VERTEX_BIT),
fragMod.stageInfo(VK_SHADER_STAGE_FRAGMENT_BIT) };
VkVertexInputBindingDescription binding{}; binding.stride = sizeof(GizmoVertex);
VkVertexInputAttributeDescription attrs[2]{};
attrs[0].location=0; attrs[0].format=VK_FORMAT_R32G32B32_SFLOAT; attrs[0].offset=0;
attrs[1].location=1; attrs[1].format=VK_FORMAT_R32G32B32A32_SFLOAT; attrs[1].offset=12;
VkPipelineVertexInputStateCreateInfo vi{}; vi.sType=VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
vi.vertexBindingDescriptionCount=1; vi.pVertexBindingDescriptions=&binding;
vi.vertexAttributeDescriptionCount=2; vi.pVertexAttributeDescriptions=attrs;
VkPipelineInputAssemblyStateCreateInfo ia{}; ia.sType=VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
ia.topology=VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
VkPipelineViewportStateCreateInfo vps{}; vps.sType=VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
vps.viewportCount=1; vps.scissorCount=1;
VkPipelineRasterizationStateCreateInfo rast{}; rast.sType=VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
rast.polygonMode=VK_POLYGON_MODE_FILL; rast.cullMode=VK_CULL_MODE_NONE; rast.lineWidth=1;
VkPipelineMultisampleStateCreateInfo ms{}; ms.sType=VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
ms.rasterizationSamples=vkCtx_->getMsaaSamples();
VkPipelineDepthStencilStateCreateInfo ds{}; ds.sType=VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
ds.depthTestEnable=VK_FALSE; // Always on top
VkPipelineColorBlendAttachmentState blend{};
blend.blendEnable=VK_TRUE;
blend.srcColorBlendFactor=VK_BLEND_FACTOR_SRC_ALPHA; blend.dstColorBlendFactor=VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
blend.colorBlendOp=VK_BLEND_OP_ADD;
blend.srcAlphaBlendFactor=VK_BLEND_FACTOR_ONE; blend.dstAlphaBlendFactor=VK_BLEND_FACTOR_ZERO;
blend.alphaBlendOp=VK_BLEND_OP_ADD;
blend.colorWriteMask=0xF;
VkPipelineColorBlendStateCreateInfo cb{}; cb.sType=VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
cb.attachmentCount=1; cb.pAttachments=&blend;
VkDynamicState dynStates[]={VK_DYNAMIC_STATE_VIEWPORT,VK_DYNAMIC_STATE_SCISSOR};
VkPipelineDynamicStateCreateInfo dyn{}; dyn.sType=VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
dyn.dynamicStateCount=2; dyn.pDynamicStates=dynStates;
VkGraphicsPipelineCreateInfo pci{}; pci.sType=VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
pci.stageCount=2; pci.pStages=stages;
pci.pVertexInputState=&vi; pci.pInputAssemblyState=&ia; pci.pViewportState=&vps;
pci.pRasterizationState=&rast; pci.pMultisampleState=&ms; pci.pDepthStencilState=&ds;
pci.pColorBlendState=&cb; pci.pDynamicState=&dyn;
pci.layout=pipelineLayout_; pci.renderPass=renderPass_;
vkCreateGraphicsPipelines(dev, vkCtx_->getPipelineCache(), 1, &pci, nullptr, &pipeline_);
return true;
}
} // namespace editor
} // namespace wowee
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