chore: remove dead UI header files (scroll_fade_fbo.h, gpu_mask.h)
Both are header-only, in no CMake target, #included nowhere, and their only symbols (ScrollFadeRT, DrawScrollFadeMask) are referenced nowhere: - src/ui/effects/scroll_fade_fbo.h — superseded by the shader-based scroll_fade_shader.h (the implementation actually used by settings_page). - src/ui/material/gpu_mask.h — a GPU blend-mask helper never integrated. App + test build clean after removal; tests pass; hygiene clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
@@ -1,418 +0,0 @@
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// DragonX Wallet - ImGui Edition
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// Copyright 2024-2026 The Hush Developers
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// Released under the GPLv3
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//
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// Offscreen render-target scroll fade — the ImGui equivalent of CSS mask-image.
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// Renders scrollable content to an offscreen surface, then composites it back
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// as a textured mesh strip with vertex alpha for edge fading.
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// This produces a true per-pixel fade that works with any background
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// (including acrylic/backdrop transparency).
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//
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// Supports both OpenGL (DRAGONX_HAS_GLAD) and DX11 (DRAGONX_USE_DX11).
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#pragma once
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#include "imgui.h"
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#include "imgui_internal.h"
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#include <cstdio>
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// ============================================================================
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// Platform detection
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// ============================================================================
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#if defined(DRAGONX_USE_DX11)
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#include <d3d11.h>
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#define SCROLL_FADE_HAS_OFFSCREEN 1
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#define SCROLL_FADE_DX11 1
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#elif defined(DRAGONX_HAS_GLAD)
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#include <glad/gl.h>
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#include "../../util/logger.h"
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#ifndef GL_FRAMEBUFFER_BINDING
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#define GL_FRAMEBUFFER_BINDING 0x8CA6
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#endif
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#ifndef GL_VIEWPORT
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#define GL_VIEWPORT 0x0BA2
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#endif
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#ifndef GL_SCISSOR_TEST
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#define GL_SCISSOR_TEST 0x0C11
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#endif
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#define SCROLL_FADE_HAS_OFFSCREEN 1
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#define SCROLL_FADE_GL 1
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#endif
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#ifdef SCROLL_FADE_HAS_OFFSCREEN
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namespace dragonx {
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namespace ui {
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namespace effects {
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// ============================================================================
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// ScrollFadeRT — manages an offscreen render target for scroll-fade rendering
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// ============================================================================
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class ScrollFadeRT {
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public:
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ScrollFadeRT() = default;
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~ScrollFadeRT() { destroy(); }
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// Non-copyable
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ScrollFadeRT(const ScrollFadeRT&) = delete;
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ScrollFadeRT& operator=(const ScrollFadeRT&) = delete;
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/// Ensure RT matches the required dimensions. Returns true if ready.
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bool ensure(int w, int h) {
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if (w <= 0 || h <= 0) return false;
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if (isValid() && w == width_ && h == height_) return true;
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return init(w, h);
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}
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void destroy();
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bool isValid() const;
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/// Get the texture as an ImTextureID for compositing.
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ImTextureID textureID() const;
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int width() const { return width_; }
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int height() const { return height_; }
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#ifdef SCROLL_FADE_DX11
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ID3D11RenderTargetView* rtv() const { return rtv_; }
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#endif
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#ifdef SCROLL_FADE_GL
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unsigned int fbo() const { return fbo_; }
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#endif
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private:
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bool init(int w, int h);
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int width_ = 0;
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int height_ = 0;
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#ifdef SCROLL_FADE_DX11
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ID3D11Texture2D* tex_ = nullptr;
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ID3D11RenderTargetView* rtv_ = nullptr;
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ID3D11ShaderResourceView* srv_ = nullptr;
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#endif
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#ifdef SCROLL_FADE_GL
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unsigned int fbo_ = 0;
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unsigned int colorTex_ = 0;
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#endif
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};
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// ============================================================================
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// Implementations
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// ============================================================================
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#ifdef SCROLL_FADE_DX11
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// --- DX11 helpers to get device/context from ImGui backend ---
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inline ID3D11Device* GetDX11Device() {
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ImGuiIO& io = ImGui::GetIO();
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if (!io.BackendRendererUserData) return nullptr;
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return *reinterpret_cast<ID3D11Device**>(io.BackendRendererUserData);
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}
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inline ID3D11DeviceContext* GetDX11Context() {
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ID3D11Device* dev = GetDX11Device();
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if (!dev) return nullptr;
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ID3D11DeviceContext* ctx = nullptr;
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dev->GetImmediateContext(&ctx);
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return ctx; // caller must Release()
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}
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inline bool ScrollFadeRT::init(int w, int h) {
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destroy();
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ID3D11Device* dev = GetDX11Device();
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if (!dev) return false;
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width_ = w;
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height_ = h;
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// Create texture
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D3D11_TEXTURE2D_DESC td = {};
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td.Width = (UINT)w;
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td.Height = (UINT)h;
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td.MipLevels = 1;
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td.ArraySize = 1;
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td.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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td.SampleDesc.Count = 1;
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td.Usage = D3D11_USAGE_DEFAULT;
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td.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
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if (FAILED(dev->CreateTexture2D(&td, nullptr, &tex_))) {
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DEBUG_LOGF("ScrollFadeRT: CreateTexture2D failed\n");
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destroy();
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return false;
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}
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// Render target view
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if (FAILED(dev->CreateRenderTargetView(tex_, nullptr, &rtv_))) {
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DEBUG_LOGF("ScrollFadeRT: CreateRenderTargetView failed\n");
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destroy();
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return false;
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}
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// Shader resource view (for sampling as texture)
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if (FAILED(dev->CreateShaderResourceView(tex_, nullptr, &srv_))) {
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DEBUG_LOGF("ScrollFadeRT: CreateShaderResourceView failed\n");
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destroy();
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return false;
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}
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return true;
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}
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inline void ScrollFadeRT::destroy() {
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if (srv_) { srv_->Release(); srv_ = nullptr; }
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if (rtv_) { rtv_->Release(); rtv_ = nullptr; }
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if (tex_) { tex_->Release(); tex_ = nullptr; }
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width_ = height_ = 0;
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}
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inline bool ScrollFadeRT::isValid() const { return rtv_ != nullptr; }
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inline ImTextureID ScrollFadeRT::textureID() const {
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return (ImTextureID)srv_;
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}
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#endif // SCROLL_FADE_DX11
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#ifdef SCROLL_FADE_GL
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inline bool ScrollFadeRT::init(int w, int h) {
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destroy();
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width_ = w;
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height_ = h;
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glGenFramebuffers(1, &fbo_);
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glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
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glGenTextures(1, &colorTex_);
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glBindTexture(GL_TEXTURE_2D, colorTex_);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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GL_TEXTURE_2D, colorTex_, 0);
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GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glBindTexture(GL_TEXTURE_2D, 0);
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if (status != GL_FRAMEBUFFER_COMPLETE) {
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DEBUG_LOGF("ScrollFadeRT: FBO incomplete (0x%X)\n", status);
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destroy();
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return false;
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}
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return true;
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}
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inline void ScrollFadeRT::destroy() {
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if (colorTex_) { glDeleteTextures(1, &colorTex_); colorTex_ = 0; }
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if (fbo_) { glDeleteFramebuffers(1, &fbo_); fbo_ = 0; }
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width_ = height_ = 0;
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}
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inline bool ScrollFadeRT::isValid() const { return fbo_ != 0; }
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inline ImTextureID ScrollFadeRT::textureID() const {
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return (ImTextureID)(intptr_t)colorTex_;
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}
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#endif // SCROLL_FADE_GL
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// ============================================================================
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// Callback state — singleton storage for bind/unbind data
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// ============================================================================
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struct ScrollFadeState {
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#ifdef SCROLL_FADE_DX11
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ID3D11RenderTargetView* offscreenRTV = nullptr;
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ID3D11RenderTargetView* savedRTV = nullptr;
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ID3D11DepthStencilView* savedDSV = nullptr;
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D3D11_VIEWPORT savedVP = {};
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#endif
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#ifdef SCROLL_FADE_GL
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unsigned int fbo = 0;
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int savedFBO = 0;
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int savedVP[4] = {};
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bool savedScissorEnabled = true; // ImGui always has scissor enabled
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#endif
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int vpW = 0, vpH = 0; // framebuffer pixel dimensions for viewport
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};
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inline ScrollFadeState& GetScrollFadeState() {
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static ScrollFadeState s;
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return s;
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}
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// ============================================================================
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// Callbacks — inserted into the draw list via AddCallback
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// ============================================================================
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#ifdef SCROLL_FADE_DX11
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inline void BindRTCallback(const ImDrawList*, const ImDrawCmd*) {
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auto& st = GetScrollFadeState();
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ID3D11DeviceContext* ctx = GetDX11Context();
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if (!ctx) return;
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// Save current RT and viewport
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UINT numVP = 1;
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ctx->OMGetRenderTargets(1, &st.savedRTV, &st.savedDSV);
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ctx->RSGetViewports(&numVP, &st.savedVP);
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// Bind offscreen RT
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ctx->OMSetRenderTargets(1, &st.offscreenRTV, nullptr);
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// Set viewport to match RT size
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D3D11_VIEWPORT vp = {};
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vp.Width = (FLOAT)st.vpW;
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vp.Height = (FLOAT)st.vpH;
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vp.MaxDepth = 1.0f;
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ctx->RSSetViewports(1, &vp);
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// Clear to transparent
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float clearColor[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
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ctx->ClearRenderTargetView(st.offscreenRTV, clearColor);
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ctx->Release();
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}
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inline void UnbindRTCallback(const ImDrawList*, const ImDrawCmd*) {
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auto& st = GetScrollFadeState();
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ID3D11DeviceContext* ctx = GetDX11Context();
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if (!ctx) return;
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// Restore previous RT and viewport
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ctx->OMSetRenderTargets(1, &st.savedRTV, st.savedDSV);
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ctx->RSSetViewports(1, &st.savedVP);
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// Release the refs from OMGetRenderTargets
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if (st.savedRTV) { st.savedRTV->Release(); st.savedRTV = nullptr; }
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if (st.savedDSV) { st.savedDSV->Release(); st.savedDSV = nullptr; }
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ctx->Release();
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}
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#endif // SCROLL_FADE_DX11
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#ifdef SCROLL_FADE_GL
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inline void BindRTCallback(const ImDrawList*, const ImDrawCmd*) {
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auto& st = GetScrollFadeState();
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// Save current FBO and viewport
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &st.savedFBO);
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glGetIntegerv(GL_VIEWPORT, st.savedVP);
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glBindFramebuffer(GL_FRAMEBUFFER, st.fbo);
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glViewport(0, 0, st.vpW, st.vpH);
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// Disable scissor test inside the FBO. ImGui's renderer computes
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// scissor rects relative to the main framebuffer dimensions — those
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// coordinates would be wrong for our offscreen surface. The child
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// window's content is already bounded by ImGui's layout, and the
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// composite step applies its own clip rect, so skipping scissor
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// in the FBO is safe.
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glDisable(GL_SCISSOR_TEST);
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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}
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inline void UnbindRTCallback(const ImDrawList*, const ImDrawCmd*) {
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auto& st = GetScrollFadeState();
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glBindFramebuffer(GL_FRAMEBUFFER, (unsigned int)st.savedFBO);
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glViewport(st.savedVP[0], st.savedVP[1], st.savedVP[2], st.savedVP[3]);
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if (st.savedScissorEnabled)
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glEnable(GL_SCISSOR_TEST);
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}
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#endif // SCROLL_FADE_GL
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// ============================================================================
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// Composite helper — draw the RT texture as a mesh strip with alpha fade
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// ============================================================================
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/// Draw the offscreen texture onto `dl` as a vertical strip with alpha=0 at
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/// the faded edges and alpha=1 in the middle. Produces a true CSS-like
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/// mask-image: linear-gradient() result.
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///
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/// @param logicalW, logicalH Logical display dimensions (DisplaySize) for
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/// UV calculation — NOT the RT pixel dimensions. ImGui screen coords
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/// are in logical units, and the FBO projection maps them 1:1 to the
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/// logical coordinate space, so UVs must divide by logical size.
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inline void CompositeWithFade(ImDrawList* dl,
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ImTextureID texID,
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const ImVec2& screenMin,
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const ImVec2& screenMax,
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int logicalW, int logicalH,
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float fadeTop, float fadeBot,
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bool needTop, bool needBot)
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{
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float left = screenMin.x;
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float right = screenMax.x;
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float y0 = screenMin.y;
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float y1 = screenMin.y + (needTop ? fadeTop : 0.0f);
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float y2 = screenMax.y - (needBot ? fadeBot : 0.0f);
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float y3 = screenMax.y;
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// Clamp in case fade zones overlap
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if (y1 > y2) { float mid = (y0 + y3) * 0.5f; y1 = y2 = mid; }
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// UV coordinates — map screen position (logical) to render target texture.
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// Screen coords are in logical (DisplaySize) space. The FBO projection
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// maps these 1:1, so divide by logical dimensions to get [0,1] UVs.
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float uL = screenMin.x / (float)logicalW;
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float uR = screenMax.x / (float)logicalW;
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#ifdef SCROLL_FADE_GL
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// OpenGL: FBO Y is flipped (ImGui top=0 → GL bottom=0)
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|
||||||
auto uvY = [&](float y) -> float { return 1.0f - y / (float)logicalH; };
|
|
||||||
#else
|
|
||||||
// DX11: no Y flip (both ImGui and DX11 have (0,0) at top-left)
|
|
||||||
auto uvY = [&](float y) -> float { return y / (float)logicalH; };
|
|
||||||
#endif
|
|
||||||
|
|
||||||
ImU32 colOpaque = IM_COL32(255, 255, 255, 255);
|
|
||||||
ImU32 colClear = IM_COL32(255, 255, 255, 0);
|
|
||||||
ImU32 colTop = needTop ? colClear : colOpaque;
|
|
||||||
ImU32 colBot = needBot ? colClear : colOpaque;
|
|
||||||
|
|
||||||
dl->PushTextureID(texID);
|
|
||||||
dl->PrimReserve(18, 8);
|
|
||||||
|
|
||||||
ImDrawVert* vtx = dl->_VtxWritePtr;
|
|
||||||
ImDrawIdx* idx = dl->_IdxWritePtr;
|
|
||||||
ImDrawIdx base = (ImDrawIdx)dl->_VtxCurrentIdx;
|
|
||||||
|
|
||||||
vtx[0] = { ImVec2(left, y0), ImVec2(uL, uvY(y0)), colTop };
|
|
||||||
vtx[1] = { ImVec2(right, y0), ImVec2(uR, uvY(y0)), colTop };
|
|
||||||
vtx[2] = { ImVec2(left, y1), ImVec2(uL, uvY(y1)), colOpaque };
|
|
||||||
vtx[3] = { ImVec2(right, y1), ImVec2(uR, uvY(y1)), colOpaque };
|
|
||||||
vtx[4] = { ImVec2(left, y2), ImVec2(uL, uvY(y2)), colOpaque };
|
|
||||||
vtx[5] = { ImVec2(right, y2), ImVec2(uR, uvY(y2)), colOpaque };
|
|
||||||
vtx[6] = { ImVec2(left, y3), ImVec2(uL, uvY(y3)), colBot };
|
|
||||||
vtx[7] = { ImVec2(right, y3), ImVec2(uR, uvY(y3)), colBot };
|
|
||||||
|
|
||||||
idx[0] = base+0; idx[1] = base+1; idx[2] = base+3;
|
|
||||||
idx[3] = base+0; idx[4] = base+3; idx[5] = base+2;
|
|
||||||
idx[6] = base+2; idx[7] = base+3; idx[8] = base+5;
|
|
||||||
idx[9] = base+2; idx[10] = base+5; idx[11] = base+4;
|
|
||||||
idx[12] = base+4; idx[13] = base+5; idx[14] = base+7;
|
|
||||||
idx[15] = base+4; idx[16] = base+7; idx[17] = base+6;
|
|
||||||
|
|
||||||
dl->_VtxWritePtr += 8;
|
|
||||||
dl->_IdxWritePtr += 18;
|
|
||||||
dl->_VtxCurrentIdx += 8;
|
|
||||||
|
|
||||||
dl->PopTextureID();
|
|
||||||
}
|
|
||||||
|
|
||||||
} // namespace effects
|
|
||||||
} // namespace ui
|
|
||||||
} // namespace dragonx
|
|
||||||
|
|
||||||
#endif // SCROLL_FADE_HAS_OFFSCREEN
|
|
||||||
@@ -1,190 +0,0 @@
|
|||||||
// DragonX Wallet - ImGui Edition
|
|
||||||
// Copyright 2024-2026 The Hush Developers
|
|
||||||
// Released under the GPLv3
|
|
||||||
//
|
|
||||||
// GPU alpha mask — the ImGui equivalent of CSS mask-image: linear-gradient().
|
|
||||||
// Uses AddCallback to switch the GPU blend mode so that gradient quads
|
|
||||||
// multiply the framebuffer's alpha (and RGB) by the source alpha, producing
|
|
||||||
// a smooth per-pixel fade without vertex-spacing artefacts.
|
|
||||||
|
|
||||||
#pragma once
|
|
||||||
|
|
||||||
#include "imgui.h"
|
|
||||||
|
|
||||||
#ifdef DRAGONX_USE_DX11
|
|
||||||
#include <d3d11.h>
|
|
||||||
#else
|
|
||||||
#ifdef DRAGONX_HAS_GLAD
|
|
||||||
#include <glad/gl.h>
|
|
||||||
#else
|
|
||||||
#include <SDL3/SDL_opengl.h>
|
|
||||||
#endif
|
|
||||||
#include <SDL3/SDL.h> // for SDL_GL_GetProcAddress
|
|
||||||
#endif
|
|
||||||
|
|
||||||
namespace dragonx {
|
|
||||||
namespace ui {
|
|
||||||
namespace material {
|
|
||||||
|
|
||||||
// ============================================================================
|
|
||||||
// Blend-mode callbacks — called by ImGui's backend during draw list rendering
|
|
||||||
// ============================================================================
|
|
||||||
|
|
||||||
#ifdef DRAGONX_USE_DX11
|
|
||||||
|
|
||||||
// Cached DX11 blend state for the mask pass
|
|
||||||
inline ID3D11BlendState* GetMaskBlendState() {
|
|
||||||
static ID3D11BlendState* s_maskBlend = nullptr;
|
|
||||||
if (!s_maskBlend) {
|
|
||||||
ImGuiIO& io = ImGui::GetIO();
|
|
||||||
if (!io.BackendRendererUserData) return nullptr;
|
|
||||||
ID3D11Device* dev = *reinterpret_cast<ID3D11Device**>(io.BackendRendererUserData);
|
|
||||||
if (!dev) return nullptr;
|
|
||||||
|
|
||||||
D3D11_BLEND_DESC desc = {};
|
|
||||||
desc.RenderTarget[0].BlendEnable = TRUE;
|
|
||||||
desc.RenderTarget[0].SrcBlend = D3D11_BLEND_ZERO;
|
|
||||||
desc.RenderTarget[0].DestBlend = D3D11_BLEND_SRC_ALPHA;
|
|
||||||
desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
|
|
||||||
desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ZERO;
|
|
||||||
desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_SRC_ALPHA;
|
|
||||||
desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
|
|
||||||
desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
|
|
||||||
dev->CreateBlendState(&desc, &s_maskBlend);
|
|
||||||
}
|
|
||||||
return s_maskBlend;
|
|
||||||
}
|
|
||||||
|
|
||||||
// Switch to mask blend: dst *= srcAlpha (both RGB and A)
|
|
||||||
inline void MaskBlendCallback(const ImDrawList*, const ImDrawCmd*) {
|
|
||||||
ImGuiIO& io = ImGui::GetIO();
|
|
||||||
if (!io.BackendRendererUserData) return;
|
|
||||||
// The ImGui DX11 backend stores the device as the first pointer
|
|
||||||
ID3D11Device* dev = *reinterpret_cast<ID3D11Device**>(io.BackendRendererUserData);
|
|
||||||
if (!dev) return;
|
|
||||||
ID3D11DeviceContext* ctx = nullptr;
|
|
||||||
dev->GetImmediateContext(&ctx);
|
|
||||||
if (!ctx) return;
|
|
||||||
|
|
||||||
ID3D11BlendState* bs = GetMaskBlendState();
|
|
||||||
if (bs) {
|
|
||||||
float blendFactor[4] = {0, 0, 0, 0};
|
|
||||||
ctx->OMSetBlendState(bs, blendFactor, 0xFFFFFFFF);
|
|
||||||
}
|
|
||||||
ctx->Release();
|
|
||||||
}
|
|
||||||
|
|
||||||
// Restore normal ImGui blend: src*srcA + dst*(1-srcA)
|
|
||||||
inline void RestoreBlendCallback(const ImDrawList*, const ImDrawCmd*) {
|
|
||||||
ImGuiIO& io = ImGui::GetIO();
|
|
||||||
if (!io.BackendRendererUserData) return;
|
|
||||||
ID3D11Device* dev = *reinterpret_cast<ID3D11Device**>(io.BackendRendererUserData);
|
|
||||||
if (!dev) return;
|
|
||||||
ID3D11DeviceContext* ctx = nullptr;
|
|
||||||
dev->GetImmediateContext(&ctx);
|
|
||||||
if (!ctx) return;
|
|
||||||
// Setting nullptr restores the default blend state that ImGui's DX11
|
|
||||||
// backend configures at the start of each frame.
|
|
||||||
ctx->OMSetBlendState(nullptr, nullptr, 0xFFFFFFFF);
|
|
||||||
ctx->Release();
|
|
||||||
}
|
|
||||||
|
|
||||||
#else // OpenGL
|
|
||||||
|
|
||||||
// glBlendFuncSeparate may not be in the GLAD profile — load it once via SDL.
|
|
||||||
typedef void (*PFN_glBlendFuncSeparate)(GLenum, GLenum, GLenum, GLenum);
|
|
||||||
inline PFN_glBlendFuncSeparate GetBlendFuncSeparate() {
|
|
||||||
static PFN_glBlendFuncSeparate fn = nullptr;
|
|
||||||
static bool resolved = false;
|
|
||||||
if (!resolved) {
|
|
||||||
resolved = true;
|
|
||||||
fn = (PFN_glBlendFuncSeparate)(void*)SDL_GL_GetProcAddress("glBlendFuncSeparate");
|
|
||||||
}
|
|
||||||
return fn;
|
|
||||||
}
|
|
||||||
|
|
||||||
inline void MaskBlendCallback(const ImDrawList*, const ImDrawCmd*) {
|
|
||||||
// dst.rgb = dst.rgb * srcAlpha (erase content where mask alpha < 1)
|
|
||||||
// dst.a = dst.a * srcAlpha (match alpha channel)
|
|
||||||
auto fn = GetBlendFuncSeparate();
|
|
||||||
if (fn)
|
|
||||||
fn(GL_ZERO, GL_SRC_ALPHA, GL_ZERO, GL_SRC_ALPHA);
|
|
||||||
else
|
|
||||||
glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
|
|
||||||
}
|
|
||||||
|
|
||||||
inline void RestoreBlendCallback(const ImDrawList*, const ImDrawCmd*) {
|
|
||||||
// Restore ImGui's exact blend state:
|
|
||||||
// RGB: src*srcA + dst*(1-srcA)
|
|
||||||
// Alpha: src*1 + dst*(1-srcA)
|
|
||||||
auto fn = GetBlendFuncSeparate();
|
|
||||||
if (fn)
|
|
||||||
fn(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
|
|
||||||
else
|
|
||||||
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
|
||||||
}
|
|
||||||
|
|
||||||
#endif
|
|
||||||
|
|
||||||
// ============================================================================
|
|
||||||
// DrawScrollFadeMask — draw gradient quads that mask the top/bottom edges
|
|
||||||
// of a scrollable child region, producing a smooth per-pixel fade.
|
|
||||||
//
|
|
||||||
// Call this on the child's draw list BEFORE EndChild().
|
|
||||||
// The gradient quads use the mask blend mode to multiply the existing
|
|
||||||
// framebuffer content by their alpha, so alpha=1 means "keep" and
|
|
||||||
// alpha=0 means "erase to transparent/black".
|
|
||||||
//
|
|
||||||
// Parameters:
|
|
||||||
// dl — the child window's draw list (ImGui::GetWindowDrawList())
|
|
||||||
// clipMin/Max — the child window's visible area (screen coords)
|
|
||||||
// fadeH — the height of the fade zone in pixels
|
|
||||||
// scrollY — current scroll offset (ImGui::GetScrollY())
|
|
||||||
// scrollMaxY — maximum scroll offset (ImGui::GetScrollMaxY())
|
|
||||||
// ============================================================================
|
|
||||||
inline void DrawScrollFadeMask(ImDrawList* dl,
|
|
||||||
const ImVec2& clipMin, const ImVec2& clipMax,
|
|
||||||
float fadeH,
|
|
||||||
float scrollY, float scrollMaxY)
|
|
||||||
{
|
|
||||||
if (fadeH <= 0.0f) return;
|
|
||||||
|
|
||||||
bool needTop = scrollY > 1.0f;
|
|
||||||
bool needBottom = scrollMaxY > 0 && scrollY < scrollMaxY - 1.0f;
|
|
||||||
if (!needTop && !needBottom) return;
|
|
||||||
|
|
||||||
float left = clipMin.x;
|
|
||||||
float right = clipMax.x;
|
|
||||||
|
|
||||||
// Switch to mask blend mode
|
|
||||||
dl->AddCallback(MaskBlendCallback, nullptr);
|
|
||||||
|
|
||||||
if (needTop) {
|
|
||||||
// Top gradient: alpha=0 at top edge (erase) → alpha=1 at top+fadeH (keep)
|
|
||||||
ImVec2 tMin(left, clipMin.y);
|
|
||||||
ImVec2 tMax(right, clipMin.y + fadeH);
|
|
||||||
ImU32 transparent = IM_COL32(0, 0, 0, 0);
|
|
||||||
ImU32 opaque = IM_COL32(0, 0, 0, 255);
|
|
||||||
dl->AddRectFilledMultiColor(tMin, tMax,
|
|
||||||
transparent, transparent, // top-left, top-right
|
|
||||||
opaque, opaque); // bottom-left, bottom-right
|
|
||||||
}
|
|
||||||
|
|
||||||
if (needBottom) {
|
|
||||||
// Bottom gradient: alpha=1 at bottom-fadeH (keep) → alpha=0 at bottom (erase)
|
|
||||||
ImVec2 bMin(left, clipMax.y - fadeH);
|
|
||||||
ImVec2 bMax(right, clipMax.y);
|
|
||||||
ImU32 opaque = IM_COL32(0, 0, 0, 255);
|
|
||||||
ImU32 transparent = IM_COL32(0, 0, 0, 0);
|
|
||||||
dl->AddRectFilledMultiColor(bMin, bMax,
|
|
||||||
opaque, opaque, // top-left, top-right
|
|
||||||
transparent, transparent); // bottom-left, bottom-right
|
|
||||||
}
|
|
||||||
|
|
||||||
// Restore normal blend mode
|
|
||||||
dl->AddCallback(RestoreBlendCallback, nullptr);
|
|
||||||
}
|
|
||||||
|
|
||||||
} // namespace material
|
|
||||||
} // namespace ui
|
|
||||||
} // namespace dragonx
|
|
||||||
Reference in New Issue
Block a user