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    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    Which shader/video filter setting for Atari 7800?

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    atari 7800shadersshaderfilterfiltering
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    • TimZettT
      TimZett
      last edited by

      Any recommendations?
      I'd like to extend my Atari 7800 retroarch.cfg and apply some video filter/shader settings which considerably, not to say quite extremely blur the image on games.
      On-default it's so blocky.

      I tried these but i see no any change:
      https://retropie.org.uk/forum/topic/20024/slang-shaders-configurations-for-each-system/2

      Any ideas/recommendations?

      Linux retropie 4.4.8, running on a Raspberry Pi 3 B+. ROMS outsourced to USB stick formatted with exFat, 32 GB Micro SD, 2 A power supply, no overclocking

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      • TimZettT
        TimZett
        last edited by TimZett

        Hmm - meanwhile I came across this folder here:

        /retropie/configs/all/retroarch/shaders
        

        Is there a way to use these, respectively can I tell the Atari 7800 emulator somhow to use them?

        EDIT:
        This is how my retroarch.cfg for the Atari 7800 looks right now:

        # Settings made here will only override settings in the global retroarch.cfg if placed above the #include line
        
        input_remapping_directory = "/opt/retropie/configs/atari7800/"
        
        audio_volume = "-10.000000"
        Video_smooth = "true"
        
        video_shader_enable = "true"
        video_shader = "~/.config/retroarch/shaders/color/palm-color.glslp"
        
        #include "/opt/retropie/configs/all/retroarch.cfg"
        

        I chose an (think so) extra flashy shader, however I can see no any difference.

        Linux retropie 4.4.8, running on a Raspberry Pi 3 B+. ROMS outsourced to USB stick formatted with exFat, 32 GB Micro SD, 2 A power supply, no overclocking

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        • TimZettT
          TimZett
          last edited by

          OK guys I got it to work and I'd like to share it with you.
          No idea which of the lines are actually mandatory and which not, but anyway it works, e.g. with this CRT filter:

          # Settings made here will only override settings in the global retroarch.cfg if placed above the #include line
          
          input_remapping_directory = "/opt/retropie/configs/atari7800/"
          
          audio_volume = "-10.000000"
          Video_smooth = "true"
          
          auto_shaders_enable = "true"
          input_shader_next = "m"
          input_shader_prev = "n"
          
          video_shader_dir = "~/.config/retroarch/shaders"
          video_filter_dir = "default"
          video_shader_enable = "true"
          video_shader = "~/.config/retroarch/shaders/crt-pi-vertical.glsl"
          
          #include "/opt/retropie/configs/all/retroarch.cfg"
          
          

          Linux retropie 4.4.8, running on a Raspberry Pi 3 B+. ROMS outsourced to USB stick formatted with exFat, 32 GB Micro SD, 2 A power supply, no overclocking

          mituM 1 Reply Last reply Reply Quote 1
          • mituM
            mitu Global Moderator @TimZett
            last edited by mitu

            @TimZett Thank you for sharing the solution. Most likely, the lines needed are

            auto_shaders_enable = "true"
            video_shader = "~/.config/retroarch/shaders/crt-pi-vertical.glsl"
            

            This can be also be done directly from the RGUI, by saving the shader preset for the core, as described near the end of the doc page.

            TimZettT 1 Reply Last reply Reply Quote 0
            • TimZettT
              TimZett @mitu
              last edited by TimZett

              @mitu There must be something missing at yours - I just tried it and the filter isn't applied any longer.
              I will play around a bit and let you know later.

              By the way, do you know how to apply more than one filter at a time (cascading)?

              EDIT:
              Got it. This is all we need:

              video_shader_enable = "true"
              video_shader = "~/.config/retroarch/shaders/[Shader Filename]"
              

              Linux retropie 4.4.8, running on a Raspberry Pi 3 B+. ROMS outsourced to USB stick formatted with exFat, 32 GB Micro SD, 2 A power supply, no overclocking

              mituM 1 Reply Last reply Reply Quote 0
              • mituM
                mitu Global Moderator @TimZett
                last edited by mitu

                @TimZett RetroArch distributes Shader presets (.glslp) files which combine multiple shader passes with the parameters accepted by the shaders and can be loaded from the RGUI and then tweaked.
                Here's an example of such a preset (crt/gtu-famicon.glslp):

                shaders = 5
                
                shader0 = shaders/gtu-famicom/DAC_combined.glsl
                scale_type_x0 = source
                scale_x0 = 8.0
                scale_type_y0 = source
                scale_y0 = 1.0
                filter_linear0 = false
                frame_count_mod0 = 2
                float_framebuffer0 = true
                
                shader1 = shaders/gtu-famicom/lowPass.glsl
                scale_type_1 = source
                scale_1 = 1.0
                filter_linear1 = false
                frame_count_mod1 = 32
                float_framebuffer1 = true
                
                shader2 = shaders/gtu-famicom/combFilter.glsl
                scale_type_2 = source
                scale_2 = 1.0
                filter_linear2 = false
                frame_count_mod2 = 2
                float_framebuffer2 = true
                
                shader3 = shaders/gtu-famicom/scaleX.glsl
                scale_type_x3 = viewport
                scale_x3 = 1.0
                scale_type_y3 = source
                scale_y3 = 1.0
                float_framebuffer3 = true
                filter_linear3 = false
                
                shader4 = shaders/gtu-famicom/scaleY.glsl
                scale_type_x4 = source
                scale_x4 = 1.0
                scale_type_y4 = viewport
                scale_y4 = 1.0
                filter_linear4 = false
                float_framebuffer4 = true
                
                textures = nestable
                nestable = shaders/gtu-famicom/NesTable.png
                nestable_linear = false
                nestable_mipmap = false
                nestable_wrap_mode = clamp_to_border
                

                You can create your own presets - look in the shaders folder - or just add the shaders individually to the .cfg file with the same syntax as above.

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                • TimZettT
                  TimZett
                  last edited by TimZett

                  Thanks mitu.

                  Now for me the question is whether there is an overview available, about what each shader preset (.glsl) does and in case of a .glslp, what the individual (cascaded) shaders do.

                  The preset file names, especially those of the .glslp ones, IMO are not really self-explaining in most cases.

                  EDIT:
                  I found something:
                  http://emulation.gametechwiki.com/index.php/Shaders_and_Filters
                  If you guys know something "better" or more official please share it

                  Linux retropie 4.4.8, running on a Raspberry Pi 3 B+. ROMS outsourced to USB stick formatted with exFat, 32 GB Micro SD, 2 A power supply, no overclocking

                  mituM 1 Reply Last reply Reply Quote 0
                  • Lyle_JPL
                    Lyle_JP
                    last edited by

                    the crt vertical shader is especially for arcade games with a vertically oriented monitor. If you like the way it makes the Atari 7800 games, then go ahead and keep it, but you might just want to try the vanilla crt-pi shader instead.

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                    • mituM
                      mitu Global Moderator @TimZett
                      last edited by

                      @TimZett I think @dankcushions posted a link (maybe in another topic) to the Shader docs in Retropie's documentation - https://retropie.org.uk/docs/Shaders-and-Smoothing/.

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