From c6e73ad94d9200efd569d092d5ceac3fc73bc2e2 Mon Sep 17 00:00:00 2001
From: Matias <mat@allpurposem.at>
Date: Mon, 14 Jul 2025 11:21:25 +0200
Subject: [PATCH] feat: render window texture entirely via OpenGL calls

---
 src/main.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 5114374..1a42e63 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -30,8 +30,10 @@ class CBindOwnFramebufferPassElement final: public IPassElement {
 
     void draw(const CRegion& damage) override {
         m_pFramebuffer->bind();
-        g_pHyprOpenGL->clear(CHyprColor(0, 0, 0, 0));
         g_pHyprOpenGL->m_renderData.currentFB = m_pFramebuffer;
+
+        // TODO: this is not working
+        g_pHyprOpenGL->clear(CHyprColor(0, 0, 0, 0));
     }
 
     bool needsLiveBlur() override {
@@ -62,20 +64,57 @@ class CRenderWobblyWindowPassElement final: public IPassElement {
 
     void draw(const CRegion& damage) override {
         auto* const pWindowFB = g_pHyprOpenGL->m_renderData.currentFB;
-        pWindowFB->getTexture()->bind();
 
         m_pOldFramebuffer->bind();
         g_pHyprOpenGL->m_renderData.currentFB = m_pOldFramebuffer;
 
         const auto windowBox = m_pWindow->getFullWindowBoundingBox();
 
-        g_pHyprOpenGL->m_renderData.primarySurfaceUVTopLeft =
-            Vector2D {windowBox.x, windowBox.y} / pWindowFB->m_size;
-        g_pHyprOpenGL->m_renderData.primarySurfaceUVBottomRight =
+        CBox newBox = windowBox;
+        g_pHyprOpenGL->m_renderData.renderModif.applyToBox(newBox);
+
+        // get transform
+        const auto TRANSFORM =
+            wlTransformToHyprutils(invertTransform(g_pHyprOpenGL->m_renderData.pMonitor->m_transform
+            ));
+
+        Mat3x3 matrix =
+            g_pHyprOpenGL->m_renderData.monitorProjection.projectBox(newBox, TRANSFORM, newBox.rot);
+        Mat3x3 glMatrix = g_pHyprOpenGL->m_renderData.projection.copy().multiply(matrix);
+
+        SShader* shader = &g_pHyprOpenGL->m_shaders->m_shRGBA;
+
+        glActiveTexture(GL_TEXTURE0);
+        pWindowFB->getTexture()->bind();
+
+        g_pHyprOpenGL->useProgram(shader->program);
+        shader->setUniformMatrix3fv(SHADER_PROJ, 1, GL_TRUE, glMatrix.getMatrix());
+        shader->setUniformInt(SHADER_TEX, 0);
+        glBindVertexArray(shader->uniformLocations[SHADER_SHADER_VAO]);
+
+        const Vector2D UVTopLeft = Vector2D {windowBox.x, windowBox.y} / pWindowFB->m_size;
+        const Vector2D UVBottomRight =
             Vector2D {windowBox.x + windowBox.width, windowBox.y + windowBox.height}
             / pWindowFB->m_size;
 
-        g_pHyprOpenGL->renderTexture(pWindowFB->getTexture(), windowBox, 1.0f, 0, 0.f, false, true);
+        const float UVs[] = {
+            (float)UVBottomRight.x,
+            (float)UVTopLeft.y,
+            (float)UVTopLeft.x,
+            (float)UVTopLeft.y,
+            (float)UVBottomRight.x,
+            (float)UVBottomRight.y,
+            (float)UVTopLeft.x,
+            (float)UVBottomRight.y,
+        };
+
+        glBindBuffer(GL_ARRAY_BUFFER, shader->uniformLocations[SHADER_SHADER_VBO_UV]);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(UVs), UVs);
+
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+        glBindVertexArray(0);
+        pWindowFB->getTexture()->unbind();
     }
 
     bool needsLiveBlur() override {