From cee187309322fa3a5a9b450d0dfd91e6d736d045 Mon Sep 17 00:00:00 2001
From: Timur Gagiev <timur.gagiev@sperasoft.com>
Date: Wed, 25 Nov 2020 06:28:11 +0300
Subject: [PATCH] fix luminance format for textures

---
 src/gapi/gl.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gapi/gl.h b/src/gapi/gl.h
index 4b79342..8baf60f 100644
--- a/src/gapi/gl.h
+++ b/src/gapi/gl.h
@@ -890,6 +890,11 @@ namespace GAPI {
                 desc.fmt  = GL_RGBA;
             }
 
+            if (fmt == FMT_LUMINANCE && Core::support.texRG) {
+                desc.ifmt = GL_R8;
+                desc.fmt  = GL_RED;
+            }
+
             #ifdef _OS_WEB // fucking firefox!
                 if (WEBGL_VERSION == 1) {
                     if (fmt == FMT_RG_FLOAT) {
@@ -1293,7 +1298,7 @@ namespace GAPI {
         support.shadowSampler  = _GL_EXT_shadow_samplers || _GL_ARB_shadow;
         support.discardFrame   = extSupport("_discard_framebuffer");
         support.texNPOT        = GLES3 || extSupport("_texture_npot") || extSupport("_texture_non_power_of_two");
-        support.texRG          = GLES3 || extSupport("_texture_rg ");   // hope that isn't last extension in string ;)
+        support.texRG          = GLES3 || extSupport("_texture_rg");
         support.texMaxLevel    = GLES3 || extSupport("_texture_max_level");
 
         #ifdef _GAPI_GLES2 // TODO