fadeout done 🎉

6 files changed, 160 insertions, 2 deletions

diff --git a/src/render/Framebuffer.cpp b/src/render/Framebuffer.cpp
new file mode 100644
index 00000000..8ab03776
--- /dev/null
+++ b/src/render/Framebuffer.cpp
@@ -0,0 +1,62 @@
+#include "Framebuffer.hpp"
+#include "OpenGL.hpp"
+
+bool CFramebuffer::alloc(int w, int h) {
+     bool firstAlloc = false;
+    if (m_iFb == (uint32_t)-1)
+    {
+        firstAlloc = true;
+        glGenFramebuffers(1, &m_iFb);
+    }
+
+    if (m_cTex.m_iTexID == 0)
+    {
+        firstAlloc = true;
+        glGenTextures(1, &m_cTex.m_iTexID);
+        glBindTexture(GL_TEXTURE_2D, m_cTex.m_iTexID);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    }
+
+    if (firstAlloc)
+    {
+        glBindTexture(GL_TEXTURE_2D, m_cTex.m_iTexID);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+
+        glBindFramebuffer(GL_FRAMEBUFFER, m_iFb);
+        glBindTexture(GL_TEXTURE_2D, m_cTex.m_iTexID);
+        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_cTex.m_iTexID, 0);
+
+        auto status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+        RASSERT((status == GL_FRAMEBUFFER_COMPLETE), "Framebuffer incomplete, couldn't create! (FB status: %i)", status);
+
+        Debug::log(LOG, "Framebuffer created, status %i", status);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindFramebuffer(GL_FRAMEBUFFER, g_pHyprOpenGL->m_iCurrentOutputFb);
+
+    m_Size = Vector2D(w, h);
+
+    return true;
+}
+
+void CFramebuffer::bind() {
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_iFb);
+    glViewport(0, 0, g_pHyprOpenGL->m_RenderData.pMonitor->vecSize.x, g_pHyprOpenGL->m_RenderData.pMonitor->vecSize.y);
+}
+
+void CFramebuffer::release() {
+    if (m_iFb != (uint32_t)-1 && m_iFb) {
+        glDeleteFramebuffers(1, &m_iFb);
+    }
+
+    if (m_cTex.m_iTexID) {
+        glDeleteTextures(1, &m_cTex.m_iTexID);
+    }
+
+    m_cTex.m_iTexID = 0;
+    m_iFb = -1;
+}
diff --git a/src/render/Framebuffer.hpp b/src/render/Framebuffer.hpp
new file mode 100644
index 00000000..5c76b9a6
--- /dev/null
+++ b/src/render/Framebuffer.hpp
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "../defines.hpp"
+#include "Texture.hpp"
+
+class CFramebuffer {
+public:
+
+    bool alloc(int w, int h);
+    void bind();
+    void release();
+    void reset();
+
+    Vector2D        m_Position;
+    Vector2D        m_Size;
+    float           m_fScale = 1;
+
+    CTexture        m_cTex;
+    GLuint          m_iFb = -1;
+
+    wl_output_transform m_tTransform; // for saving state
+};
\ No newline at end of file
diff --git a/src/render/OpenGL.cpp b/src/render/OpenGL.cpp
index 1e5ec07d..f46302ab 100644
--- a/src/render/OpenGL.cpp
+++ b/src/render/OpenGL.cpp
@@ -106,6 +106,8 @@ void CHyprOpenGLImpl::begin(SMonitor* pMonitor) {
     wlr_matrix_projection(m_RenderData.projection, pMonitor->vecSize.x, pMonitor->vecSize.y, WL_OUTPUT_TRANSFORM_NORMAL); // TODO: this is deprecated
 
     glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+
+    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_iCurrentOutputFb);
 }
 
 void CHyprOpenGLImpl::end() {
@@ -323,4 +325,58 @@ void CHyprOpenGLImpl::renderBorder(wlr_box* box, const CColor& col, int thick, i
     glDrawArrays(GL_LINE_STRIP, 0, 41);
 
     glDisableVertexAttribArray(m_shQUAD.posAttrib);
+}
+
+void CHyprOpenGLImpl::makeWindowSnapshot(CWindow* pWindow) {
+    // we trust the window is valid.
+    const auto PMONITOR = g_pCompositor->getMonitorFromID(pWindow->m_iMonitorID);
+    wlr_output_attach_render(PMONITOR->output, nullptr);
+
+    begin(PMONITOR);
+
+    const auto PFRAMEBUFFER = &m_mWindowFramebuffers[pWindow];
+
+    PFRAMEBUFFER->m_tTransform = g_pXWaylandManager->getWindowSurface(pWindow)->current.transform;
+
+    PFRAMEBUFFER->alloc(PMONITOR->vecSize.x, PMONITOR->vecSize.y);
+
+    PFRAMEBUFFER->bind();
+
+    clear(CColor(0,0,0,0)); // JIC
+
+    timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+
+    g_pHyprRenderer->renderWindow(pWindow, PMONITOR, &now, !pWindow->m_bX11DoesntWantBorders);
+
+    // restore original fb
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_iCurrentOutputFb);
+    glViewport(0, 0, g_pHyprOpenGL->m_RenderData.pMonitor->vecSize.x, g_pHyprOpenGL->m_RenderData.pMonitor->vecSize.y);
+
+    end();
+
+    wlr_output_rollback(PMONITOR->output);
+}
+
+void CHyprOpenGLImpl::renderSnapshot(CWindow** pWindow) {
+    const auto PWINDOW = *pWindow;
+
+    auto it = m_mWindowFramebuffers.begin();
+    for (;it != m_mWindowFramebuffers.end(); it++) {
+        if (it->first == PWINDOW) {
+            break;
+        }
+    }
+
+    if (it == m_mWindowFramebuffers.end() || !it->second.m_cTex.m_iTexID)
+        return;
+
+    const auto PMONITOR = g_pCompositor->getMonitorFromID(PWINDOW->m_iMonitorID);
+
+    const auto TRANSFORM = wlr_output_transform_invert(it->second.m_tTransform);
+    float matrix[9];
+    wlr_box windowBox = {0, 0, PMONITOR->vecSize.x, PMONITOR->vecSize.y};
+    wlr_matrix_project_box(matrix, &windowBox, TRANSFORM, 0, PMONITOR->output->transform_matrix);
+
+    renderTexture(it->second.m_cTex, matrix, PWINDOW->m_fAlpha, 0);
 }
\ No newline at end of file
diff --git a/src/render/OpenGL.hpp b/src/render/OpenGL.hpp
index 43fa6c6c..7d938c15 100644
--- a/src/render/OpenGL.hpp
+++ b/src/render/OpenGL.hpp
@@ -5,10 +5,12 @@
 #include "../helpers/Color.hpp"
 #include <wlr/render/egl.h>
 #include <list>
+#include <unordered_map>
 
 #include "Shaders.hpp"
 #include "Shader.hpp"
 #include "Texture.hpp"
+#include "Framebuffer.hpp"
 
 inline const float matrixFlip180[] = {
 	1.0f, 0.0f, 0.0f,
@@ -40,11 +42,18 @@ public:
     void    renderTexture(const CTexture&, float matrix[9], float a, int round = 0);
     void    renderBorder(wlr_box*, const CColor&, int thick = 1, int round = 0);
 
+    void    makeWindowSnapshot(CWindow*);
+    void    renderSnapshot(CWindow**);
+
     void    clear(const CColor&);
     void    scissor(const wlr_box*);
 
     SCurrentRenderData m_RenderData;
 
+    GLint  m_iCurrentOutputFb = 0;
+
+    std::unordered_map<CWindow*, CFramebuffer> m_mWindowFramebuffers;
+
 private:
     std::list<GLuint>       m_lBuffers;
     std::list<GLuint>       m_lTextures;
diff --git a/src/render/Renderer.cpp b/src/render/Renderer.cpp
index d34d6897..fa62b5fd 100644
--- a/src/render/Renderer.cpp
+++ b/src/render/Renderer.cpp
@@ -82,6 +82,11 @@ void CHyprRenderer::renderWorkspaceWithFullscreenWindow(SMonitor* pMonitor, SWor
 }
 
 void CHyprRenderer::renderWindow(CWindow* pWindow, SMonitor* pMonitor, timespec* time, bool decorate) {
+    if (pWindow->m_bFadingOut) {
+        g_pHyprOpenGL->renderSnapshot(&pWindow);
+        return;
+    }
+
     const auto REALPOS = pWindow->m_vRealPosition;
     SRenderData renderdata = {pMonitor->output, time, REALPOS.x, REALPOS.y};
     renderdata.surface = g_pXWaylandManager->getWindowSurface(pWindow);
@@ -134,7 +139,7 @@ void CHyprRenderer::renderAllClientsForMonitor(const int& ID, timespec* time) {
 
     // Non-floating
     for (auto& w : g_pCompositor->m_lWindows) {
-        if (!g_pCompositor->windowValidMapped(&w))
+        if (!g_pCompositor->windowValidMapped(&w) && !w.m_bFadingOut)
             continue;
 
         if (w.m_bIsFloating)
@@ -149,7 +154,7 @@ void CHyprRenderer::renderAllClientsForMonitor(const int& ID, timespec* time) {
 
     // floating on top
     for (auto& w : g_pCompositor->m_lWindows) {
-        if (!g_pCompositor->windowValidMapped(&w))
+        if (!g_pCompositor->windowValidMapped(&w) && !w.m_bFadingOut)
             continue;
 
         if (!w.m_bIsFloating)
diff --git a/src/render/Renderer.hpp b/src/render/Renderer.hpp
index cd0b5d01..ec1597f8 100644
--- a/src/render/Renderer.hpp
+++ b/src/render/Renderer.hpp
@@ -5,6 +5,7 @@
 #include "../helpers/Monitor.hpp"
 #include "../helpers/Workspace.hpp"
 #include "../Window.hpp"
+#include "OpenGL.hpp"
 
 class CHyprRenderer {
 public:
@@ -20,6 +21,9 @@ private:
     void                renderWorkspaceWithFullscreenWindow(SMonitor*, SWorkspace*, timespec*);
     void                renderWindow(CWindow*, SMonitor*, timespec*, bool);
     void                renderDragIcon(SMonitor*, timespec*);
+
+
+    friend class CHyprOpenGLImpl;
 };
 
 inline std::unique_ptr<CHyprRenderer> g_pHyprRenderer;