Fix lighttile shader texture bindings

In bindful texture mode the wrong image was being used for the depth
image: depthtile1RenderImage instead of the intended
depthtile2RenderImage.

Fixes #1734.

Author: slipher

src/engine/renderer/gl_shader.cpp

@@ -2982,7 +2982,7 @@ GLShader_lighttile::GLShader_lighttile() :
 
 void GLShader_lighttile::SetShaderProgramUniforms( ShaderProgramDescriptor *shaderProgram )
 {
-	glUniform1i( glGetUniformLocation( shaderProgram->id, "u_DepthMap" ), 0 );
+	glUniform1i( glGetUniformLocation( shaderProgram->id, "u_DepthTile2" ), 0 );
 }
 
 GLShader_fxaa::GLShader_fxaa() :

src/engine/renderer/tr_backend.cpp

@@ -1306,7 +1306,7 @@ void RB_RenderPostDepthLightTile()
 	gl_lighttileShader->SetUniformBlock_Lights( tr.dlightUBO );
 
 	gl_lighttileShader->SetUniform_DepthTile2Bindless(
-		GL_BindToTMU( 1, tr.depthtile2RenderImage ) 
+		GL_BindToTMU( 0, tr.depthtile2RenderImage )
 	);
 
 	R_BindVBO( tr.lighttileVBO );