From d568b787172525f57b00a8051b0d87ca4c34bc5c Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey@blender.org>
Date: Thu, 1 May 2025 08:40:18 +0200
Subject: [PATCH] GPU: Add immediate drawing of textured rectangle

New function called immRectf_with_texco(), which resides next to the other
immRectf utilities.

Currently used in a single place in the sequencer, but it will be used in
a few other places in the future.

Pull Request: https://projects.blender.org/blender/blender/pulls/138222
---
 .../space_sequencer/sequencer_preview_draw.cc  | 16 +---------------
 source/blender/gpu/GPU_immediate_util.hh       |  3 +++
 .../blender/gpu/intern/gpu_immediate_util.cc   | 18 ++++++++++++++++++
 3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/source/blender/editors/space_sequencer/sequencer_preview_draw.cc b/source/blender/editors/space_sequencer/sequencer_preview_draw.cc
index 704300326fd..be5eaf698c1 100644
--- a/source/blender/editors/space_sequencer/sequencer_preview_draw.cc
+++ b/source/blender/editors/space_sequencer/sequencer_preview_draw.cc
@@ -485,8 +485,6 @@ static void sequencer_draw_display_buffer(const bContext *C,
     immUniformColor3f(1.0f, 1.0f, 1.0f);
   }
 
-  immBegin(GPU_PRIM_TRI_FAN, 4);
-
   rctf preview;
   rctf canvas;
   sequencer_preview_get_rect(&preview, scene, region, sseq, draw_overlay, draw_backdrop);
@@ -498,19 +496,7 @@ static void sequencer_draw_display_buffer(const bContext *C,
     BLI_rctf_init(&canvas, 0.0f, 1.0f, 0.0f, 1.0f);
   }
 
-  immAttr2f(texCoord, canvas.xmin, canvas.ymin);
-  immVertex2f(pos, preview.xmin, preview.ymin);
-
-  immAttr2f(texCoord, canvas.xmin, canvas.ymax);
-  immVertex2f(pos, preview.xmin, preview.ymax);
-
-  immAttr2f(texCoord, canvas.xmax, canvas.ymax);
-  immVertex2f(pos, preview.xmax, preview.ymax);
-
-  immAttr2f(texCoord, canvas.xmax, canvas.ymin);
-  immVertex2f(pos, preview.xmax, preview.ymin);
-
-  immEnd();
+  immRectf_with_texco(pos, texCoord, preview, canvas);
 
   GPU_texture_unbind(texture);
   GPU_texture_free(texture);
diff --git a/source/blender/gpu/GPU_immediate_util.hh b/source/blender/gpu/GPU_immediate_util.hh
index 2e1ec709f40..bb77912f296 100644
--- a/source/blender/gpu/GPU_immediate_util.hh
+++ b/source/blender/gpu/GPU_immediate_util.hh
@@ -12,10 +12,13 @@
 
 #include "BLI_sys_types.h"
 
+struct rctf;
+
 /* Draw 2D rectangles (replaces glRect functions) */
 /* caller is responsible for vertex format & shader */
 void immRectf(uint pos, float x1, float y1, float x2, float y2);
 void immRecti(uint pos, int x1, int y1, int x2, int y2);
+void immRectf_with_texco(uint pos, uint tex_coord, const rctf &p, const rctf &uv);
 
 /**
  * Same as #immRectf / #immRecti but does not call #immBegin / #immEnd.
diff --git a/source/blender/gpu/intern/gpu_immediate_util.cc b/source/blender/gpu/intern/gpu_immediate_util.cc
index 4aa650f1276..5978038bc5d 100644
--- a/source/blender/gpu/intern/gpu_immediate_util.cc
+++ b/source/blender/gpu/intern/gpu_immediate_util.cc
@@ -12,6 +12,7 @@
 
 #include "BLI_math_rotation.h"
 #include "BLI_math_vector.h"
+#include "BLI_rect.h"
 #include "BLI_utildefines.h"
 
 #include "GPU_immediate.hh"
@@ -118,6 +119,23 @@ void immRecti_fast_with_color(
   immVertex2i(pos, x1, y2);
 }
 
+void immRectf_with_texco(const uint pos, const uint tex_coord, const rctf &p, const rctf &uv)
+{
+  immBegin(GPU_PRIM_TRI_FAN, 4);
+  immAttr2f(tex_coord, uv.xmin, uv.ymin);
+  immVertex2f(pos, p.xmin, p.ymin);
+
+  immAttr2f(tex_coord, uv.xmin, uv.ymax);
+  immVertex2f(pos, p.xmin, p.ymax);
+
+  immAttr2f(tex_coord, uv.xmax, uv.ymax);
+  immVertex2f(pos, p.xmax, p.ymax);
+
+  immAttr2f(tex_coord, uv.xmax, uv.ymin);
+  immVertex2f(pos, p.xmax, p.ymin);
+  immEnd();
+}
+
 #if 0 /* more complete version in case we want that */
 void immRecti_complete(int x1, int y1, int x2, int y2, const float color[4])
 {