From d7e9eb65e233f216688377df43359a822a5d098f Mon Sep 17 00:00:00 2001
From: vaxerski <43317083+vaxerski@users.noreply.github.com>
Date: Fri, 21 Jul 2023 17:11:50 +0200
Subject: [PATCH] renderer: use primitive rendering for copying buffers

---
 src/render/OpenGL.cpp | 60 +++++++++++++++++++++++++++++++++++++++++--
 src/render/OpenGL.hpp |  1 +
 2 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/src/render/OpenGL.cpp b/src/render/OpenGL.cpp
index 5b75a8655..9012fcb6a 100644
--- a/src/render/OpenGL.cpp
+++ b/src/render/OpenGL.cpp
@@ -199,7 +199,7 @@ void CHyprOpenGLImpl::end() {
 
         blend(false);
 
-        renderTexture(m_RenderData.pCurrentMonData->primaryFB.m_cTex, &monbox, 1.f, 0);
+        renderTexturePrimitive(m_RenderData.pCurrentMonData->primaryFB.m_cTex, &monbox);
 
         blend(true);
 
@@ -720,6 +720,62 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
     glBindTexture(tex.m_iTarget, 0);
 }
 
+void CHyprOpenGLImpl::renderTexturePrimitive(const CTexture& tex, wlr_box* pBox) {
+    RASSERT(m_RenderData.pMonitor, "Tried to render texture without begin()!");
+    RASSERT((tex.m_iTexID > 0), "Attempted to draw NULL texture!");
+
+    TRACY_GPU_ZONE("RenderTexturePrimitive");
+
+    if (m_RenderData.damage.empty())
+        return;
+
+    wlr_box newBox = *pBox;
+    scaleBox(&newBox, m_RenderData.renderModif.scale);
+    newBox.x += m_RenderData.renderModif.translate.x;
+    newBox.y += m_RenderData.renderModif.translate.y;
+
+    static auto* const PDIMINACTIVE = &g_pConfigManager->getConfigValuePtr("decoration:dim_inactive")->intValue;
+
+    // get transform
+    const auto TRANSFORM = wlr_output_transform_invert(!m_bEndFrame ? WL_OUTPUT_TRANSFORM_NORMAL : m_RenderData.pMonitor->transform);
+    float      matrix[9];
+    wlr_matrix_project_box(matrix, &newBox, TRANSFORM, 0, m_RenderData.pMonitor->output->transform_matrix);
+
+    float glMatrix[9];
+    wlr_matrix_multiply(glMatrix, m_RenderData.projection, matrix);
+
+    CShader* shader = &m_RenderData.pCurrentMonData->m_shPASSTHRURGBA;
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(tex.m_iTarget, tex.m_iTexID);
+
+    glUseProgram(shader->program);
+
+#ifndef GLES2
+    glUniformMatrix3fv(shader->proj, 1, GL_TRUE, glMatrix);
+#else
+    wlr_matrix_transpose(glMatrix, glMatrix);
+    glUniformMatrix3fv(shader->proj, 1, GL_FALSE, glMatrix);
+#endif
+    glUniform1i(shader->tex, 0);
+
+    glVertexAttribPointer(shader->posAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
+    glVertexAttribPointer(shader->texAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
+
+    glEnableVertexAttribArray(shader->posAttrib);
+    glEnableVertexAttribArray(shader->texAttrib);
+
+    for (auto& RECT : m_RenderData.damage.getRects()) {
+        scissor(&RECT);
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+    }
+
+    glDisableVertexAttribArray(shader->posAttrib);
+    glDisableVertexAttribArray(shader->texAttrib);
+
+    glBindTexture(tex.m_iTarget, 0);
+}
+
 // This probably isn't the fastest
 // but it works... well, I guess?
 //
@@ -1650,7 +1706,7 @@ void CHyprOpenGLImpl::clearWithTex() {
     }
 
     if (TEXIT != m_mMonitorBGTextures.end())
-        renderTexture(TEXIT->second, &m_mMonitorRenderResources[m_RenderData.pMonitor].backgroundTexBox, 1.0, 0);
+        renderTexturePrimitive(TEXIT->second, &m_mMonitorRenderResources[m_RenderData.pMonitor].backgroundTexBox);
 }
 
 void CHyprOpenGLImpl::destroyMonitorResources(CMonitor* pMonitor) {
diff --git a/src/render/OpenGL.hpp b/src/render/OpenGL.hpp
index c2d3a7081..9080c90b1 100644
--- a/src/render/OpenGL.hpp
+++ b/src/render/OpenGL.hpp
@@ -179,6 +179,7 @@ class CHyprOpenGLImpl {
 
     void          renderTextureInternalWithDamage(const CTexture&, wlr_box* pBox, float a, CRegion* damage, int round = 0, bool discardOpaque = false, bool noAA = false,
                                                   bool allowCustomUV = false, bool allowDim = false);
+    void          renderTexturePrimitive(const CTexture& tex, wlr_box* pBox);
     void          renderSplash(cairo_t* const, cairo_surface_t* const, double);
 
     void          preBlurForCurrentMonitor();