fixup: make it working with bindless textures

Author: illwieckz

src/engine/renderer/glsl_source/fxaa_fp.glsl

@@ -46,7 +46,12 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
 #insert fxaa3_11_fp
 
+#if defined(HAVE_ARB_bindless_texture)
+uniform sampler2D u_ColorMap_linear;
+#define u_ColorMap u_ColorMap_linear
+#else
 uniform sampler2D	u_ColorMap;
+#endif
 
 #if __VERSION__ > 120
 out vec4 outputColor;

src/engine/renderer/tr_backend.cpp

@@ -1627,15 +1627,31 @@ void RB_FXAA()
 
 	bool greaterThanGL33 = std::make_pair( glConfig.glMajor, glConfig.glMinor ) >= std::make_pair( 3, 3 );
 
+	GLuint64 handle = 0;
+
 	// FXAA expect GL_LINEAR for the sampling to work.
 	if ( greaterThanGL33 )
 	{
-		// Bind a sampler.
 		GLuint sampler = 0;
 		glGenSamplers( 1, &sampler );
 		glSamplerParameteri( sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR) ;
 		glSamplerParameteri( sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
-		glBindSampler( 0, sampler );
+
+		if ( glConfig.usingBindlessTextures )
+		{
+			// Set a handler.
+			GLuint texture = tr.currentRenderImage[backEnd.currentMainFBO]->texnum;
+			handle = glGetTextureSamplerHandleARB( texture, sampler );
+			glMakeTextureHandleResidentARB( handle );
+			GLuint program = gl_fxaaShader->GetProgram()->id;
+			GLint location = glGetUniformLocation( program, "u_ColorMap_linear" );
+			glUniformHandleui64ARB( location, handle );
+		}
+		else
+		{
+			// Bind a sampler.
+			glBindSampler( 0, sampler );
+		}
 	}
 	else
 	{
@@ -1652,8 +1668,16 @@ void RB_FXAA()
 	// Make sure we didn't break other effects expecting GL_NEAREST.
 	if ( greaterThanGL33 )
 	{
-		// Unbind the sampler.
-		glBindSampler( 0, 0 );
+		if ( glConfig.usingBindlessTextures )
+		{
+			// Unset the handler.
+			glMakeTextureHandleNonResidentARB( handle );
+		}
+		else
+		{
+			// Unbind the sampler.
+			glBindSampler( 0, 0 );
+		}
 	}
 	else
 	{