Adds visual shader example
Introduces a visual shader example to demonstrate node-based shader creation. This commit includes: - Core node editor implementation with node dragging, linking, and selection - Example nodes for color, perlin noise, add, multiply, and output - Dynamic input pins to showcase node extension capabilities - Integration with OpenGL for rendering node previews
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|
2967 3112 7822472311300107 imgui-populate-prefix/src/imgui-populate-stamp/imgui-populate-done a8b496480a89f145
|
||||||
|
2967 3112 7822472311300107 C:/Users/spenc/OneDrive/Documents/GitHub/ImNodeEditor/build/_deps/imgui-subbuild/CMakeFiles/imgui-populate-complete a8b496480a89f145
|
||||||
|
2967 3112 7822472311300107 C:/Users/spenc/OneDrive/Documents/GitHub/ImNodeEditor/build/_deps/imgui-subbuild/imgui-populate-prefix/src/imgui-populate-stamp/imgui-populate-done a8b496480a89f145
|
||||||
|
|||||||
@@ -1,4 +1,17 @@
|
|||||||
#include <cstdio>
|
#include <cstdio>
|
||||||
|
#include <vector>
|
||||||
|
#include <array>
|
||||||
|
#include <cmath>
|
||||||
|
#include <cstdint>
|
||||||
|
#include <unordered_map>
|
||||||
|
#include <unordered_set>
|
||||||
|
#include <optional>
|
||||||
|
#include <random>
|
||||||
|
#include <algorithm>
|
||||||
|
#include <cstdlib> // std::rand
|
||||||
|
|
||||||
|
#define _USE_MATH_DEFINES
|
||||||
|
#include <math.h>
|
||||||
|
|
||||||
// GLEW must come before GLFW / any GL header
|
// GLEW must come before GLFW / any GL header
|
||||||
#include <GL/glew.h>
|
#include <GL/glew.h>
|
||||||
@@ -10,13 +23,448 @@
|
|||||||
|
|
||||||
#include "ImNodeEditor.h"
|
#include "ImNodeEditor.h"
|
||||||
|
|
||||||
static void glfw_error_callback(int error, const char* desc) {
|
// -------------------------------------------------
|
||||||
|
// Window / ImGui boilerplate
|
||||||
|
// -------------------------------------------------
|
||||||
|
static void glfw_error_callback(int error, const char *desc)
|
||||||
|
{
|
||||||
std::fprintf(stderr, "GLFW error %d: %s\n", error, desc);
|
std::fprintf(stderr, "GLFW error %d: %s\n", error, desc);
|
||||||
}
|
}
|
||||||
|
|
||||||
int main() {
|
// -------------------------------------------------
|
||||||
|
// Tiny GL helpers
|
||||||
|
// -------------------------------------------------
|
||||||
|
static GLuint CreateTextureRGBA8(int w, int h, const void *pixels = nullptr)
|
||||||
|
{
|
||||||
|
GLuint tex = 0;
|
||||||
|
glGenTextures(1, &tex);
|
||||||
|
glBindTexture(GL_TEXTURE_2D, tex);
|
||||||
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||||
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||||
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
||||||
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
||||||
|
return tex;
|
||||||
|
}
|
||||||
|
static void UpdateTextureRGBA8(GLuint tex, int w, int h, const void *pixels)
|
||||||
|
{
|
||||||
|
glBindTexture(GL_TEXTURE_2D, tex);
|
||||||
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
||||||
|
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
||||||
|
}
|
||||||
|
|
||||||
|
// -------------------------------------------------
|
||||||
|
// Simple 2D Perlin noise for 128x128 previews.
|
||||||
|
// -------------------------------------------------
|
||||||
|
struct Perlin2D
|
||||||
|
{
|
||||||
|
std::array<int, 512> p{};
|
||||||
|
explicit Perlin2D(uint32_t seed = 0xC0FFEE)
|
||||||
|
{
|
||||||
|
std::vector<int> perm(256);
|
||||||
|
for (int i = 0; i < 256; i++)
|
||||||
|
perm[i] = i;
|
||||||
|
std::mt19937 rng(seed);
|
||||||
|
std::shuffle(perm.begin(), perm.end(), rng);
|
||||||
|
for (int i = 0; i < 512; i++)
|
||||||
|
p[i] = perm[i & 255];
|
||||||
|
}
|
||||||
|
static inline float fade(float t) { return t * t * t * (t * (t * 6 - 15) + 10); }
|
||||||
|
static inline float lerp(float a, float b, float t) { return a + t * (b - a); }
|
||||||
|
static inline float grad(int h, float x, float y)
|
||||||
|
{
|
||||||
|
switch (h & 3)
|
||||||
|
{
|
||||||
|
case 0:
|
||||||
|
return x + y;
|
||||||
|
case 1:
|
||||||
|
return -x + y;
|
||||||
|
case 2:
|
||||||
|
return x - y;
|
||||||
|
default:
|
||||||
|
return -x - y;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
float noise(float x, float y) const
|
||||||
|
{
|
||||||
|
int X = (int)floorf(x) & 255;
|
||||||
|
int Y = (int)floorf(y) & 255;
|
||||||
|
x -= floorf(x);
|
||||||
|
y -= floorf(y);
|
||||||
|
float u = fade(x);
|
||||||
|
float v = fade(y);
|
||||||
|
int A = p[X] + Y;
|
||||||
|
int B = p[X + 1] + Y;
|
||||||
|
float n00 = grad(p[A], x, y);
|
||||||
|
float n10 = grad(p[B], x - 1, y);
|
||||||
|
float n01 = grad(p[A + 1], x, y - 1);
|
||||||
|
float n11 = grad(p[B + 1], x - 1, y - 1);
|
||||||
|
float nx0 = lerp(n00, n10, u);
|
||||||
|
float nx1 = lerp(n01, n11, u);
|
||||||
|
return lerp(nx0, nx1, v); // ~[-1,1]
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
// -------------------------------------------------
|
||||||
|
// Node runtime / evaluation
|
||||||
|
// -------------------------------------------------
|
||||||
|
using namespace ImNodeEditor;
|
||||||
|
|
||||||
|
enum class NodeKind
|
||||||
|
{
|
||||||
|
Color,
|
||||||
|
Perlin,
|
||||||
|
Add, // dynamic fan-in
|
||||||
|
Multiply, // 2 inputs
|
||||||
|
Output
|
||||||
|
};
|
||||||
|
|
||||||
|
static constexpr int kPrevW = 128;
|
||||||
|
static constexpr int kPrevH = 128;
|
||||||
|
|
||||||
|
struct NodeRuntime
|
||||||
|
{
|
||||||
|
NodeKind kind{};
|
||||||
|
std::vector<uint8_t> rgba; // kPrevW*kPrevH*4
|
||||||
|
GLuint tex = 0;
|
||||||
|
bool dirty = true;
|
||||||
|
|
||||||
|
// params
|
||||||
|
ImVec4 color{1, 0, 0, 1}; // Color
|
||||||
|
float perlinScale = 6.0f; // Perlin
|
||||||
|
uint32_t perlinSeed = 1337; // Perlin
|
||||||
|
|
||||||
|
// For Add dynamic pins we keep a list of input pin IDs (UI helper)
|
||||||
|
std::vector<int> dynamicInputs;
|
||||||
|
};
|
||||||
|
|
||||||
|
// storage: nodeId -> runtime
|
||||||
|
static std::unordered_map<int, NodeRuntime> gNodeData;
|
||||||
|
|
||||||
|
static NodeRuntime &GetData(int nodeId)
|
||||||
|
{
|
||||||
|
auto it = gNodeData.find(nodeId);
|
||||||
|
if (it == gNodeData.end())
|
||||||
|
{
|
||||||
|
it = gNodeData.emplace(nodeId, NodeRuntime{}).first;
|
||||||
|
it->second.rgba.resize(kPrevW * kPrevH * 4, 0);
|
||||||
|
it->second.tex = CreateTextureRGBA8(kPrevW, kPrevH, it->second.rgba.data());
|
||||||
|
it->second.dirty = true;
|
||||||
|
}
|
||||||
|
return it->second;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Evaluate a single node into its preview texture (assumes upstream ready)
|
||||||
|
static void EvalNode(Editor &ed, int nodeId)
|
||||||
|
{
|
||||||
|
Node *n = ed.GetNode(nodeId);
|
||||||
|
if (!n)
|
||||||
|
return;
|
||||||
|
NodeRuntime &data = GetData(nodeId);
|
||||||
|
if (!data.dirty)
|
||||||
|
return;
|
||||||
|
|
||||||
|
auto &px = data.rgba;
|
||||||
|
px.assign(kPrevW * kPrevH * 4, 0);
|
||||||
|
|
||||||
|
switch (data.kind)
|
||||||
|
{
|
||||||
|
case NodeKind::Color:
|
||||||
|
{
|
||||||
|
const uint8_t r = (uint8_t)std::roundf(std::clamp(data.color.x, 0.0f, 1.0f) * 255.0f);
|
||||||
|
const uint8_t g = (uint8_t)std::roundf(std::clamp(data.color.y, 0.0f, 1.0f) * 255.0f);
|
||||||
|
const uint8_t b = (uint8_t)std::roundf(std::clamp(data.color.z, 0.0f, 1.0f) * 255.0f);
|
||||||
|
const uint8_t a = (uint8_t)std::roundf(std::clamp(data.color.w, 0.0f, 1.0f) * 255.0f);
|
||||||
|
for (int i = 0; i < kPrevW * kPrevH; i++)
|
||||||
|
{
|
||||||
|
px[i * 4 + 0] = r;
|
||||||
|
px[i * 4 + 1] = g;
|
||||||
|
px[i * 4 + 2] = b;
|
||||||
|
px[i * 4 + 3] = a;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case NodeKind::Perlin:
|
||||||
|
{
|
||||||
|
Perlin2D p{data.perlinSeed};
|
||||||
|
for (int y = 0; y < kPrevH; y++)
|
||||||
|
{
|
||||||
|
for (int x = 0; x < kPrevW; x++)
|
||||||
|
{
|
||||||
|
float fx = (float)x / (float)kPrevW;
|
||||||
|
float fy = (float)y / (float)kPrevH;
|
||||||
|
float v = p.noise(fx * data.perlinScale, fy * data.perlinScale); // [-1,1]
|
||||||
|
float g = 0.5f * (v + 1.0f); // [0,1]
|
||||||
|
uint8_t c = (uint8_t)std::roundf(g * 255.0f);
|
||||||
|
int i = (y * kPrevW + x) * 4;
|
||||||
|
px[i + 0] = c;
|
||||||
|
px[i + 1] = c;
|
||||||
|
px[i + 2] = c;
|
||||||
|
px[i + 3] = 255;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case NodeKind::Add:
|
||||||
|
{
|
||||||
|
// Gather upstream pixels for each input
|
||||||
|
std::vector<const std::vector<uint8_t> *> upstreamPx;
|
||||||
|
for (int inPid : n->inputs)
|
||||||
|
{
|
||||||
|
for (int lid : ed.GetLinksForPin(inPid))
|
||||||
|
{
|
||||||
|
const Link *L = ed.GetLink(lid);
|
||||||
|
if (!L)
|
||||||
|
continue;
|
||||||
|
const Pin *sp = ed.GetPin(L->aPin);
|
||||||
|
if (!sp)
|
||||||
|
continue;
|
||||||
|
auto it = gNodeData.find(sp->node);
|
||||||
|
if (it != gNodeData.end())
|
||||||
|
upstreamPx.push_back(&it->second.rgba);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (!upstreamPx.empty())
|
||||||
|
{
|
||||||
|
for (int i = 0; i < kPrevW * kPrevH; i++)
|
||||||
|
{
|
||||||
|
int accR = 0, accG = 0, accB = 0, accA = 0;
|
||||||
|
for (auto *v : upstreamPx)
|
||||||
|
{
|
||||||
|
accR += (*v)[i * 4 + 0];
|
||||||
|
accG += (*v)[i * 4 + 1];
|
||||||
|
accB += (*v)[i * 4 + 2];
|
||||||
|
accA += (*v)[i * 4 + 3];
|
||||||
|
}
|
||||||
|
px[i * 4 + 0] = (uint8_t)std::min(accR, 255);
|
||||||
|
px[i * 4 + 1] = (uint8_t)std::min(accG, 255);
|
||||||
|
px[i * 4 + 2] = (uint8_t)std::min(accB, 255);
|
||||||
|
px[i * 4 + 3] = (uint8_t)std::min(accA, 255);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case NodeKind::Multiply:
|
||||||
|
{
|
||||||
|
// Expect 2 inputs: A * B, clamp to [0,1]
|
||||||
|
std::vector<const std::vector<uint8_t> *> upstreamPx;
|
||||||
|
for (int inPid : n->inputs)
|
||||||
|
{
|
||||||
|
for (int lid : ed.GetLinksForPin(inPid))
|
||||||
|
{
|
||||||
|
const Link *L = ed.GetLink(lid);
|
||||||
|
if (!L)
|
||||||
|
continue;
|
||||||
|
const Pin *sp = ed.GetPin(L->aPin);
|
||||||
|
if (!sp)
|
||||||
|
continue;
|
||||||
|
auto it = gNodeData.find(sp->node);
|
||||||
|
if (it != gNodeData.end())
|
||||||
|
upstreamPx.push_back(&it->second.rgba);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (upstreamPx.size() >= 2)
|
||||||
|
{
|
||||||
|
auto *A = upstreamPx[0];
|
||||||
|
auto *B = upstreamPx[1];
|
||||||
|
for (int i = 0; i < kPrevW * kPrevH; i++)
|
||||||
|
{
|
||||||
|
float r = ((*A)[i * 4 + 0] / 255.0f) * ((*B)[i * 4 + 0] / 255.0f);
|
||||||
|
float g = ((*A)[i * 4 + 1] / 255.0f) * ((*B)[i * 4 + 1] / 255.0f);
|
||||||
|
float b = ((*A)[i * 4 + 2] / 255.0f) * ((*B)[i * 4 + 2] / 255.0f);
|
||||||
|
float a = ((*A)[i * 4 + 3] / 255.0f) * ((*B)[i * 4 + 3] / 255.0f);
|
||||||
|
px[i * 4 + 0] = (uint8_t)std::roundf(std::clamp(r, 0.0f, 1.0f) * 255.0f);
|
||||||
|
px[i * 4 + 1] = (uint8_t)std::roundf(std::clamp(g, 0.0f, 1.0f) * 255.0f);
|
||||||
|
px[i * 4 + 2] = (uint8_t)std::roundf(std::clamp(b, 0.0f, 1.0f) * 255.0f);
|
||||||
|
px[i * 4 + 3] = (uint8_t)std::roundf(std::clamp(a, 0.0f, 1.0f) * 255.0f);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case NodeKind::Output:
|
||||||
|
{
|
||||||
|
// Output mirrors its first input (or black if not connected)
|
||||||
|
const std::vector<uint8_t> *src = nullptr;
|
||||||
|
if (!n->inputs.empty())
|
||||||
|
{
|
||||||
|
int inPid = n->inputs[0];
|
||||||
|
for (int lid : ed.GetLinksForPin(inPid))
|
||||||
|
{
|
||||||
|
const Link *L = ed.GetLink(lid);
|
||||||
|
if (!L)
|
||||||
|
continue;
|
||||||
|
const Pin *sp = ed.GetPin(L->aPin);
|
||||||
|
if (!sp)
|
||||||
|
continue;
|
||||||
|
auto it = gNodeData.find(sp->node);
|
||||||
|
if (it != gNodeData.end())
|
||||||
|
src = &it->second.rgba;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (src)
|
||||||
|
{
|
||||||
|
px.assign(src->begin(), src->end());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
UpdateTextureRGBA8(data.tex, kPrevW, kPrevH, px.data());
|
||||||
|
ed.SetNodeImage(nodeId, (ImTextureID)(intptr_t)data.tex, ImVec2((float)kPrevW, (float)kPrevH));
|
||||||
|
data.dirty = false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void EvaluateGraph(Editor &ed)
|
||||||
|
{
|
||||||
|
auto order = ed.TopoSort();
|
||||||
|
std::unordered_set<int> inOrder(order.begin(), order.end());
|
||||||
|
for (auto &kv : gNodeData)
|
||||||
|
{
|
||||||
|
if (!inOrder.count(kv.first))
|
||||||
|
order.push_back(kv.first);
|
||||||
|
}
|
||||||
|
for (int nid : order)
|
||||||
|
{
|
||||||
|
EvalNode(ed, nid);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static void BuildGraph(Editor &editor)
|
||||||
|
{
|
||||||
|
auto PreviewSize = [](const ImRect& local) {
|
||||||
|
// Make previews smaller so pins/labels stay inside node
|
||||||
|
float w = local.Max.x - local.Min.x;
|
||||||
|
return ImMin(w, 110.0f); // cap to 110 px
|
||||||
|
};
|
||||||
|
|
||||||
|
// Color node
|
||||||
|
const int nColor = editor.AddNode("Color", ImVec2(80, 80));
|
||||||
|
const int nColorOut = editor.AddPin(nColor, PinKind::Output, PinType::Texture);
|
||||||
|
editor.SetPinLabel(nColorOut, "Tex");
|
||||||
|
{
|
||||||
|
auto &D = GetData(nColor);
|
||||||
|
D.kind = NodeKind::Color;
|
||||||
|
editor.SetNodeDrawFunction(nColor, [&](const ImRect &local, Node &node)
|
||||||
|
{
|
||||||
|
auto& d = GetData(node.id);
|
||||||
|
float s = PreviewSize(local);
|
||||||
|
ImGui::Image((ImTextureID)(intptr_t)d.tex, ImVec2(s, s));
|
||||||
|
if (ImGui::ColorEdit4("Color", &d.color.x, ImGuiColorEditFlags_NoInputs))
|
||||||
|
d.dirty = true;
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
// Perlin noise node
|
||||||
|
const int nNoise = editor.AddNode("Perlin Noise", ImVec2(80, 270));
|
||||||
|
const int nNoiseOut = editor.AddPin(nNoise, PinKind::Output, PinType::Texture);
|
||||||
|
editor.SetPinLabel(nNoiseOut, "Tex");
|
||||||
|
{
|
||||||
|
auto &D = GetData(nNoise);
|
||||||
|
D.kind = NodeKind::Perlin;
|
||||||
|
editor.SetNodeDrawFunction(nNoise, [&](const ImRect &local, Node &node)
|
||||||
|
{
|
||||||
|
auto& d = GetData(node.id);
|
||||||
|
float s = PreviewSize(local);
|
||||||
|
ImGui::Image((ImTextureID)(intptr_t)d.tex, ImVec2(s, s));
|
||||||
|
|
||||||
|
ImGui::TextUnformatted("Scale"); ImGui::SameLine();
|
||||||
|
if (ImGui::SliderFloat("##perlin_scale", &d.perlinScale, 1.0f, 32.0f))
|
||||||
|
d.dirty = true;
|
||||||
|
if (ImGui::Button("Reseed")) { d.perlinSeed = (uint32_t)std::rand(); d.dirty = true; }
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
// Add node (dynamic inputs)
|
||||||
|
const int nAdd = editor.AddNode("Add (Dynamic)", ImVec2(360, 120));
|
||||||
|
const int addInA = editor.AddPin(nAdd, PinKind::Input, PinType::Texture);
|
||||||
|
const int addInB = editor.AddPin(nAdd, PinKind::Input, PinType::Texture);
|
||||||
|
const int addOut = editor.AddPin(nAdd, PinKind::Output, PinType::Texture);
|
||||||
|
editor.SetPinLabel(addInA, "A");
|
||||||
|
editor.SetPinLabel(addInB, "B");
|
||||||
|
editor.SetPinLabel(addOut, "Tex");
|
||||||
|
{
|
||||||
|
auto &D = GetData(nAdd);
|
||||||
|
D.kind = NodeKind::Add;
|
||||||
|
D.dynamicInputs = {addInA, addInB};
|
||||||
|
editor.SetNodeDrawFunction(nAdd, [&](const ImRect &local, Node &node)
|
||||||
|
{
|
||||||
|
auto& d = GetData(node.id);
|
||||||
|
float s = PreviewSize(local);
|
||||||
|
ImGui::Image((ImTextureID)(intptr_t)d.tex, ImVec2(s, s));
|
||||||
|
|
||||||
|
if (ImGui::Button("+ Input")) {
|
||||||
|
int newIn = editor.AddPin(node.id, PinKind::Input, PinType::Texture);
|
||||||
|
editor.SetPinLabel(newIn, ("In " + std::to_string((int)node.inputs.size()-1)).c_str());
|
||||||
|
d.dynamicInputs.push_back(newIn);
|
||||||
|
d.dirty = true;
|
||||||
|
}
|
||||||
|
ImGui::SameLine();
|
||||||
|
if (!d.dynamicInputs.empty()) {
|
||||||
|
if (ImGui::Button("- Input")) {
|
||||||
|
int pid = d.dynamicInputs.back();
|
||||||
|
bool connected = false;
|
||||||
|
for (int lid : editor.GetLinksForPin(pid)) { (void)lid; connected = true; break; }
|
||||||
|
if (!connected && node.inputs.size() > 1) {
|
||||||
|
d.dynamicInputs.pop_back();
|
||||||
|
d.dirty = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
// Multiply (normalized)
|
||||||
|
const int nMul = editor.AddNode("Multiply (Normalized)", ImVec2(360, 320));
|
||||||
|
const int mulInA = editor.AddPin(nMul, PinKind::Input, PinType::Texture);
|
||||||
|
const int mulInB = editor.AddPin(nMul, PinKind::Input, PinType::Texture);
|
||||||
|
const int mulOut = editor.AddPin(nMul, PinKind::Output, PinType::Texture);
|
||||||
|
editor.SetPinLabel(mulInA, "A");
|
||||||
|
editor.SetPinLabel(mulInB, "B");
|
||||||
|
editor.SetPinLabel(mulOut, "Tex");
|
||||||
|
{
|
||||||
|
auto &D = GetData(nMul);
|
||||||
|
D.kind = NodeKind::Multiply;
|
||||||
|
editor.SetNodeDrawFunction(nMul, [&](const ImRect &local, Node &node)
|
||||||
|
{
|
||||||
|
auto &d = GetData(node.id);
|
||||||
|
float s = PreviewSize(local);
|
||||||
|
ImGui::Image((ImTextureID)(intptr_t)d.tex, ImVec2(s, s));
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
// Output node
|
||||||
|
const int nOut = editor.AddNode("Output", ImVec2(680, 220));
|
||||||
|
const int outIn = editor.AddPin(nOut, PinKind::Input, PinType::Texture);
|
||||||
|
editor.SetPinLabel(outIn, "In");
|
||||||
|
{
|
||||||
|
auto &D = GetData(nOut);
|
||||||
|
D.kind = NodeKind::Output;
|
||||||
|
editor.SetNodeDrawFunction(nOut, [&](const ImRect &local, Node &node)
|
||||||
|
{
|
||||||
|
auto& d = GetData(node.id);
|
||||||
|
float s = PreviewSize(local);
|
||||||
|
ImGui::Image((ImTextureID)(intptr_t)d.tex, ImVec2(s, s));
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
// Example wiring
|
||||||
|
editor.AddLink(nColorOut, addInA);
|
||||||
|
editor.AddLink(nNoiseOut, addInB);
|
||||||
|
editor.AddLink(addOut, mulInA);
|
||||||
|
editor.AddLink(nColorOut, mulInB);
|
||||||
|
editor.AddLink(mulOut, outIn);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
int main()
|
||||||
|
{
|
||||||
glfwSetErrorCallback(glfw_error_callback);
|
glfwSetErrorCallback(glfw_error_callback);
|
||||||
if (!glfwInit()) return 1;
|
if (!glfwInit())
|
||||||
|
return 1;
|
||||||
|
|
||||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
||||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
||||||
@@ -25,15 +473,20 @@ int main() {
|
|||||||
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
|
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
GLFWwindow* window = glfwCreateWindow(1280, 720, "ImNodeEditor - Example", nullptr, nullptr);
|
GLFWwindow *window = glfwCreateWindow(1280, 720, "ImNodeEditor - Visual Shader Example", nullptr, nullptr);
|
||||||
if (!window) { glfwTerminate(); return 2; }
|
if (!window)
|
||||||
|
{
|
||||||
|
glfwTerminate();
|
||||||
|
return 2;
|
||||||
|
}
|
||||||
glfwMakeContextCurrent(window);
|
glfwMakeContextCurrent(window);
|
||||||
glfwSwapInterval(1);
|
glfwSwapInterval(1);
|
||||||
|
|
||||||
// ---- GLEW init ----
|
// ---- GLEW init ----
|
||||||
glewExperimental = GL_TRUE;
|
glewExperimental = GL_TRUE;
|
||||||
GLenum err = glewInit();
|
GLenum err = glewInit();
|
||||||
if (err != GLEW_OK) {
|
if (err != GLEW_OK)
|
||||||
|
{
|
||||||
std::fprintf(stderr, "GLEW init error: %s\n", glewGetErrorString(err));
|
std::fprintf(stderr, "GLEW init error: %s\n", glewGetErrorString(err));
|
||||||
return 3;
|
return 3;
|
||||||
}
|
}
|
||||||
@@ -42,47 +495,28 @@ int main() {
|
|||||||
// ImGui
|
// ImGui
|
||||||
IMGUI_CHECKVERSION();
|
IMGUI_CHECKVERSION();
|
||||||
ImGui::CreateContext();
|
ImGui::CreateContext();
|
||||||
ImGuiIO& io = ImGui::GetIO(); (void)io;
|
ImGuiIO &io = ImGui::GetIO();
|
||||||
|
(void)io;
|
||||||
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard | ImGuiConfigFlags_DockingEnable;
|
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard | ImGuiConfigFlags_DockingEnable;
|
||||||
ImGui::StyleColorsDark();
|
ImGui::StyleColorsDark();
|
||||||
|
|
||||||
ImGui_ImplGlfw_InitForOpenGL(window, true);
|
ImGui_ImplGlfw_InitForOpenGL(window, true);
|
||||||
ImGui_ImplOpenGL3_Init("#version 330 core");
|
ImGui_ImplOpenGL3_Init("#version 330 core");
|
||||||
|
|
||||||
using namespace ImNodeEditor;
|
|
||||||
|
|
||||||
Editor editor;
|
Editor editor;
|
||||||
|
BuildGraph(editor);
|
||||||
// Seed example nodes/links with types
|
|
||||||
const int n1 = editor.AddNode("Number", ImVec2(100, 120));
|
|
||||||
const int n1_out = editor.AddPin(n1, PinKind::Output, PinType::Float);
|
|
||||||
|
|
||||||
const int n2 = editor.AddNode("Multiply", ImVec2(380, 160));
|
|
||||||
const int n2_inA = editor.AddPin(n2, PinKind::Input, PinType::Float);
|
|
||||||
const int n2_inB = editor.AddPin(n2, PinKind::Input, PinType::Float);
|
|
||||||
const int n2_out = editor.AddPin(n2, PinKind::Output, PinType::Float);
|
|
||||||
|
|
||||||
const int n3 = editor.AddNode("Output", ImVec2(700, 200));
|
|
||||||
const int n3_in = editor.AddPin(n3, PinKind::Input, PinType::Float);
|
|
||||||
|
|
||||||
// Texture node to showcase color/type (not connected by default)
|
|
||||||
const int n4 = editor.AddNode("Texture", ImVec2(120, 300));
|
|
||||||
const int n4_out = editor.AddPin(n4, PinKind::Output, PinType::Texture);
|
|
||||||
|
|
||||||
editor.AddLink(n1_out, n2_inA);
|
|
||||||
editor.AddLink(n2_out, n3_in);
|
|
||||||
|
|
||||||
bool show_demo_window = false;
|
bool show_demo_window = false;
|
||||||
bool show_editor_window = true;
|
bool show_editor_window = true;
|
||||||
|
|
||||||
while (!glfwWindowShouldClose(window)) {
|
while (!glfwWindowShouldClose(window))
|
||||||
|
{
|
||||||
glfwPollEvents();
|
glfwPollEvents();
|
||||||
|
|
||||||
ImGui_ImplOpenGL3_NewFrame();
|
ImGui_ImplOpenGL3_NewFrame();
|
||||||
ImGui_ImplGlfw_NewFrame();
|
ImGui_ImplGlfw_NewFrame();
|
||||||
ImGui::NewFrame();
|
ImGui::NewFrame();
|
||||||
|
|
||||||
|
|
||||||
// DockSpace
|
// DockSpace
|
||||||
{
|
{
|
||||||
ImGuiWindowFlags flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking |
|
ImGuiWindowFlags flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking |
|
||||||
@@ -90,7 +524,7 @@ int main() {
|
|||||||
ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove |
|
ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove |
|
||||||
ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
|
ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
|
||||||
|
|
||||||
const ImGuiViewport* viewport = ImGui::GetMainViewport();
|
const ImGuiViewport *viewport = ImGui::GetMainViewport();
|
||||||
ImGui::SetNextWindowPos(viewport->Pos);
|
ImGui::SetNextWindowPos(viewport->Pos);
|
||||||
ImGui::SetNextWindowSize(viewport->Size);
|
ImGui::SetNextWindowSize(viewport->Size);
|
||||||
ImGui::SetNextWindowViewport(viewport->ID);
|
ImGui::SetNextWindowViewport(viewport->ID);
|
||||||
@@ -99,27 +533,34 @@ int main() {
|
|||||||
ImGui::Begin("RootDock", nullptr, flags);
|
ImGui::Begin("RootDock", nullptr, flags);
|
||||||
ImGui::PopStyleVar(2);
|
ImGui::PopStyleVar(2);
|
||||||
ImGuiID dockspace_id = ImGui::GetID("RootDockSpace");
|
ImGuiID dockspace_id = ImGui::GetID("RootDockSpace");
|
||||||
ImGui::DockSpace(dockspace_id, ImVec2(0,0));
|
ImGui::DockSpace(dockspace_id, ImVec2(0, 0));
|
||||||
if (ImGui::BeginMenuBar()) {
|
if (ImGui::BeginMenuBar())
|
||||||
if (ImGui::BeginMenu("File")) {
|
{
|
||||||
if (ImGui::MenuItem("Save Graph")) {
|
if (ImGui::BeginMenu("File"))
|
||||||
|
{
|
||||||
|
if (ImGui::MenuItem("Save Graph"))
|
||||||
|
{
|
||||||
std::string s = editor.SaveToString();
|
std::string s = editor.SaveToString();
|
||||||
std::puts("---- SAVE ----");
|
std::puts("---- SAVE ----");
|
||||||
std::puts(s.c_str());
|
std::puts(s.c_str());
|
||||||
}
|
}
|
||||||
if (ImGui::MenuItem("Load Minimal")) {
|
if (ImGui::MenuItem("Load Minimal"))
|
||||||
const char* text =
|
{
|
||||||
|
const char *text =
|
||||||
"NODE 1 100 100 A\n"
|
"NODE 1 100 100 A\n"
|
||||||
"NODE 2 300 160 B\n"
|
"NODE 2 300 160 B\n"
|
||||||
"PIN 1 1 1 0 1\n"
|
"PIN 1 1 1 0 1\n"
|
||||||
"PIN 2 2 0 0 1\n"
|
"PIN 2 2 0 0 1\n"
|
||||||
"LINK 1 1 2\n";
|
"LINK 1 1 2\n";
|
||||||
editor.LoadFromString(text);
|
editor.LoadFromString(text);
|
||||||
|
// NOTE: If you load an external graph, rebuild gNodeData/kinds accordingly.
|
||||||
}
|
}
|
||||||
if (ImGui::MenuItem("Quit")) glfwSetWindowShouldClose(window, GLFW_TRUE);
|
if (ImGui::MenuItem("Quit"))
|
||||||
|
glfwSetWindowShouldClose(window, GLFW_TRUE);
|
||||||
ImGui::EndMenu();
|
ImGui::EndMenu();
|
||||||
}
|
}
|
||||||
if (ImGui::BeginMenu("View")) {
|
if (ImGui::BeginMenu("View"))
|
||||||
|
{
|
||||||
ImGui::MenuItem("Show ImGui Demo", nullptr, &show_demo_window);
|
ImGui::MenuItem("Show ImGui Demo", nullptr, &show_demo_window);
|
||||||
ImGui::EndMenu();
|
ImGui::EndMenu();
|
||||||
}
|
}
|
||||||
@@ -128,8 +569,15 @@ int main() {
|
|||||||
ImGui::End();
|
ImGui::End();
|
||||||
}
|
}
|
||||||
|
|
||||||
if (show_editor_window) {
|
if (show_editor_window)
|
||||||
|
{
|
||||||
ImGui::Begin("Node Editor", nullptr, ImGuiWindowFlags_NoScrollWithMouse | ImGuiWindowFlags_NoScrollbar);
|
ImGui::Begin("Node Editor", nullptr, ImGuiWindowFlags_NoScrollWithMouse | ImGuiWindowFlags_NoScrollbar);
|
||||||
|
|
||||||
|
// For simplicity, re-eval each frame (mark dirty)
|
||||||
|
for (auto &kv : gNodeData)
|
||||||
|
kv.second.dirty = true;
|
||||||
|
EvaluateGraph(editor);
|
||||||
|
|
||||||
ImVec2 avail = ImGui::GetContentRegionAvail();
|
ImVec2 avail = ImGui::GetContentRegionAvail();
|
||||||
editor.Draw("MainCanvas", avail);
|
editor.Draw("MainCanvas", avail);
|
||||||
ImGui::End();
|
ImGui::End();
|
||||||
@@ -145,6 +593,13 @@ int main() {
|
|||||||
glfwSwapBuffers(window);
|
glfwSwapBuffers(window);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
for (auto &kv : gNodeData)
|
||||||
|
{
|
||||||
|
if (kv.second.tex)
|
||||||
|
glDeleteTextures(1, &kv.second.tex);
|
||||||
|
}
|
||||||
|
gNodeData.clear();
|
||||||
|
|
||||||
ImGui_ImplOpenGL3_Shutdown();
|
ImGui_ImplOpenGL3_Shutdown();
|
||||||
ImGui_ImplGlfw_Shutdown();
|
ImGui_ImplGlfw_Shutdown();
|
||||||
ImGui::DestroyContext();
|
ImGui::DestroyContext();
|
||||||
|
|||||||
1526
src/ImNodeEditor.cpp
1526
src/ImNodeEditor.cpp
File diff suppressed because it is too large
Load Diff
@@ -63,12 +63,17 @@ struct EditorConfig {
|
|||||||
ColorTheme colors{};
|
ColorTheme colors{};
|
||||||
};
|
};
|
||||||
|
|
||||||
|
struct Node;
|
||||||
|
|
||||||
|
using NodeDrawFn = std::function<void(const ImRect& screenContentRect, Node& node)>;
|
||||||
|
|
||||||
struct Pin {
|
struct Pin {
|
||||||
int id = 0;
|
int id = 0;
|
||||||
int node = 0;
|
int node = 0;
|
||||||
PinKind kind = PinKind::Input;
|
PinKind kind = PinKind::Input;
|
||||||
int order = 0;
|
int order = 0;
|
||||||
PinType type = PinType::Any;
|
PinType type = PinType::Any;
|
||||||
|
std::string label; // optional label (shown near pin)
|
||||||
ImVec2 localPos{};
|
ImVec2 localPos{};
|
||||||
ImRect rect{};
|
ImRect rect{};
|
||||||
};
|
};
|
||||||
@@ -81,6 +86,14 @@ struct Node {
|
|||||||
std::vector<int> inputs;
|
std::vector<int> inputs;
|
||||||
std::vector<int> outputs;
|
std::vector<int> outputs;
|
||||||
bool selected = false;
|
bool selected = false;
|
||||||
|
|
||||||
|
NodeDrawFn draw;
|
||||||
|
void* userData = nullptr; // arbitrary pointer you manage
|
||||||
|
|
||||||
|
ImTextureID image = 0;
|
||||||
|
ImVec2 imageSize{0,0}; // natural size (for aspect-fit)
|
||||||
|
ImVec2 imageUV0{0,0};
|
||||||
|
ImVec2 imageUV1{1,1};
|
||||||
};
|
};
|
||||||
|
|
||||||
struct Link {
|
struct Link {
|
||||||
@@ -138,6 +151,40 @@ public:
|
|||||||
const EditorConfig& GetConfig() const { return m_cfg; }
|
const EditorConfig& GetConfig() const { return m_cfg; }
|
||||||
void SetConfig(const EditorConfig& cfg) { m_cfg = cfg; }
|
void SetConfig(const EditorConfig& cfg) { m_cfg = cfg; }
|
||||||
|
|
||||||
|
// -------- New: convenience APIs --------
|
||||||
|
|
||||||
|
// Set a node's custom draw callback (body content).
|
||||||
|
void SetNodeDrawFunction(int nodeId, NodeDrawFn fn);
|
||||||
|
|
||||||
|
// Set an image to be drawn in the node body (aspect-fit inside the content rect).
|
||||||
|
void SetNodeImage(int nodeId, ImTextureID tex, ImVec2 naturalSize,
|
||||||
|
ImVec2 uv0 = ImVec2(0,0), ImVec2 uv1 = ImVec2(1,1));
|
||||||
|
|
||||||
|
// Label a pin (shown near the circle).
|
||||||
|
void SetPinLabel(int pinId, const std::string& label);
|
||||||
|
|
||||||
|
// Graph traversal utilities (simple & convenient):
|
||||||
|
|
||||||
|
// For a pin, get all link IDs attached to it.
|
||||||
|
std::vector<int> GetLinksForPin(int pinId) const;
|
||||||
|
|
||||||
|
// For a node, get nodes that feed INTO this node (via its input pins).
|
||||||
|
std::vector<int> GetUpstreamNodes(int nodeId) const;
|
||||||
|
|
||||||
|
// For a node, get nodes that this node feeds INTO (via its output pins).
|
||||||
|
std::vector<int> GetDownstreamNodes(int nodeId) const;
|
||||||
|
|
||||||
|
// For a node, iterate each input edge: calls cb(srcNodeId, srcPinId, linkId, dstPinId).
|
||||||
|
template<typename Fn>
|
||||||
|
void ForEachInputEdge(int nodeId, Fn cb) const;
|
||||||
|
|
||||||
|
// For a node, iterate each output edge: calls cb(dstNodeId, dstPinId, linkId, srcPinId).
|
||||||
|
template<typename Fn>
|
||||||
|
void ForEachOutputEdge(int nodeId, Fn cb) const;
|
||||||
|
|
||||||
|
// Topological sort of the graph (assuming it is a DAG). Returns a list of node IDs.
|
||||||
|
std::vector<int> TopoSort() const;
|
||||||
|
|
||||||
private:
|
private:
|
||||||
// Drawing
|
// Drawing
|
||||||
void DrawCanvasBackground(ImDrawList* dl, const ImRect& canvas);
|
void DrawCanvasBackground(ImDrawList* dl, const ImRect& canvas);
|
||||||
@@ -195,4 +242,40 @@ private:
|
|||||||
HoverInfo m_hover{};
|
HoverInfo m_hover{};
|
||||||
};
|
};
|
||||||
|
|
||||||
|
|
||||||
|
// ---------- template implementations ----------
|
||||||
|
template<typename Fn>
|
||||||
|
inline void Editor::ForEachInputEdge(int nodeId, Fn cb) const
|
||||||
|
{
|
||||||
|
const Node* n = GetNode(nodeId);
|
||||||
|
if (!n) return;
|
||||||
|
for (int inPid : n->inputs) {
|
||||||
|
for (auto& kv : m_links) {
|
||||||
|
const Link& L = kv.second;
|
||||||
|
if (L.bPin == inPid) {
|
||||||
|
const Pin* srcPin = GetPin(L.aPin);
|
||||||
|
if (!srcPin) continue;
|
||||||
|
cb(srcPin->node, srcPin->id, L.id, inPid);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
template<typename Fn>
|
||||||
|
inline void Editor::ForEachOutputEdge(int nodeId, Fn cb) const
|
||||||
|
{
|
||||||
|
const Node* n = GetNode(nodeId);
|
||||||
|
if (!n) return;
|
||||||
|
for (int outPid : n->outputs) {
|
||||||
|
for (auto& kv : m_links) {
|
||||||
|
const Link& L = kv.second;
|
||||||
|
if (L.aPin == outPid) {
|
||||||
|
const Pin* dstPin = GetPin(L.bPin);
|
||||||
|
if (!dstPin) continue;
|
||||||
|
cb(dstPin->node, dstPin->id, L.id, outPid);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
} // namespace ImNodeEditor
|
} // namespace ImNodeEditor
|
||||||
|
|||||||
Reference in New Issue
Block a user