mirror of https://github.com/bsnes-emu/bsnes.git
214 lines
8.9 KiB
Plaintext
214 lines
8.9 KiB
Plaintext
input
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filter: nearest
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// IMPORTANT:
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// Shader passes need to know details about the image in the mask_texture LUT
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// files, so set the following constants in user-preset-constants.h accordingly:
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// 1.) mask_triads_per_tile = (number of horizontal triads in mask texture LUT's)
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// 2.) mask_texture_small_size = (texture size of mask*texture_small LUT's)
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// 3.) mask_texture_large_size = (texture size of mask*texture_large LUT's)
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// 4.) mask_grille_avg_color = (avg. brightness of mask_grille_texture* LUT's, in [0, 1])
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// 5.) mask_slot_avg_color = (avg. brightness of mask_slot_texture* LUT's, in [0, 1])
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// 6.) mask_shadow_avg_color = (avg. brightness of mask_shadow_texture* LUT's, in [0, 1])
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// Shader passes also need to know certain scales set in this preset, but their
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// compilation model doesn't currently allow the preset file to tell them. Make
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// sure to set the following constants in user-preset-constants.h accordingly too:
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// 1.) bloom_approx_scale_x = scale_x2
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// 2.) mask_resize_viewport_scale = vec2(scale_x6, scale_y5)
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// Finally, shader passes need to know the value of geom_max_aspect_ratio used to
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// calculate scale_y5 (among other values):
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// 1.) geom_max_aspect_ratio = (geom_max_aspect_ratio used to calculate scale_y5)
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// Pass0: Linearize the input based on CRT gamma and bob interlaced fields.
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// (Bobbing ensures we can immediately blur without getting artifacts.)
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program
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filter: nearest
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vertex: first-pass-linearize-crt-gamma-bob-fields.vs
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fragment: first-pass-linearize-crt-gamma-bob-fields.fs
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format: rgba16f
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height: 100%
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width: 100%
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// Pass1: Resample interlaced (and misconverged) scanlines vertically.
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// Separating vertical/horizontal scanline sampling is faster: It lets us
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// consider more scanlines while calculating weights for fewer pixels, and
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// it reduces our samples from vertical*horizontal to vertical+horizontal.
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// This has to come right after ORIG_LINEARIZED, because there's no
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// "original_source" scale_type we can use later.
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program
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filter: linear
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vertex: scanlines-vertical-interlacing.vs
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fragment: scanlines-vertical-interlacing.fs
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height: 400%
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width: 100%
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format: rgba16f
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// Pass2: Do a small resize blur of ORIG_LINEARIZED at an absolute size, and
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// account for convergence offsets. We want to blur a predictable portion of the
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// screen to match the phosphor bloom, and absolute scale works best for
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// reliable results with a fixed-size bloom. Picking a scale is tricky:
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// a.) 400x300 is a good compromise for the "fake-bloom" version: It's low enough
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// to blur high-res/interlaced sources but high enough that resampling
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// doesn't smear low-res sources too much.
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// b.) 320x240 works well for the "real bloom" version: It's 1-1.5% faster, and
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// the only noticeable visual difference is a larger halation spread (which
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// may be a good thing for people who like to crank it up).
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// Note the 4:3 aspect ratio assumes the input has cropped geom_overscan (so it's
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// *intended* for an ~4:3 aspect ratio).
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program
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filter: linear
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vertex: bloom-approx.vs
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fragment: bloom-approx.fs
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format: rgba16f
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width: 320 px
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height: 240 px
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// Pass3: Vertically blur the input for halation and refractive diffusion.
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// Base this on BLOOM_APPROX: This blur should be small and fast, and blurring
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// a constant portion of the screen is probably physically correct if the
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// viewport resolution is proportional to the simulated CRT size.
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program
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filter: linear
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vertex: blur9fast-vertical.vs
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fragment: blur9fast-vertical.fs
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format: rgba16f
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height: 100%
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width: 100%
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// Pass4: Horizontally blur the input for halation and refractive diffusion.
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// Note: Using a one-pass 9x9 blur is about 1% slower.
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program
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filter: linear
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vertex: blur9fast-horizontal.vs
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fragment: blur9fast-horizontal.fs
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format: rgba16f
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height: 100%
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width: 100%
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// Pass5: Lanczos-resize the phosphor mask vertically. Set the absolute
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// scale_x5 == mask_texture_small_size.x (see IMPORTANT above). Larger scales
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// will blur, and smaller scales could get nasty. The vertical size must be
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// based on the viewport size and calculated carefully to avoid artifacts later.
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// First calculate the minimum number of mask tiles we need to draw.
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// Since curvature is computed after the scanline masking pass:
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// num_resized_mask_tiles = 2.0;
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// If curvature were computed in the scanline masking pass (it's not):
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// max_mask_texel_border = ~3.0 * (1/3.0 + 4.0*sqrt(2.0) + 0.5 + 1.0);
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// max_mask_tile_border = max_mask_texel_border/
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// (min_resized_phosphor_triad_size * mask_triads_per_tile);
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// num_resized_mask_tiles = max(2.0, 1.0 + max_mask_tile_border * 2.0);
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// At typical values (triad_size >= 2.0, mask_triads_per_tile == 8):
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// num_resized_mask_tiles = ~3.8
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// Triad sizes are given in horizontal terms, so we need geom_max_aspect_ratio
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// to relate them to vertical resolution. The widest we expect is:
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// geom_max_aspect_ratio = 4.0/3.0 // Note: Shader passes need to know this!
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// The fewer triads we tile across the screen, the larger each triad will be as a
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// fraction of the viewport size, and the larger scale_y5 must be to draw a full
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// num_resized_mask_tiles. Therefore, we must decide the smallest number of
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// triads we'll guarantee can be displayed on screen. We'll set this according
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// to 3-pixel triads at 768p resolution (the lowest anyone's likely to use):
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// min_allowed_viewport_triads = 768.0*geom_max_aspect_ratio / 3.0 = 341.333333
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// Now calculate the viewport scale that ensures we can draw resized_mask_tiles:
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// min_scale_x = resized_mask_tiles * mask_triads_per_tile /
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// min_allowed_viewport_triads
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// scale_y5 = geom_max_aspect_ratio * min_scale_x
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// # Some code might depend on equal scales:
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// scale_x6 = scale_y5
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// Given our default geom_max_aspect_ratio and min_allowed_viewport_triads:
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// scale_y5 = 4.0/3.0 * 2.0/(341.33333 / 8.0) = 0.0625
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// IMPORTANT: The scales MUST be calculated in this way. If you wish to change
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// geom_max_aspect_ratio, update that constant in user-preset-constants.h!
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program
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filter: linear
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format: rgba16f
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width: 64 px
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height: 6.25%
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vertex: mask-resize-vertical.vs
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fragment: mask-resize-vertical.fs
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pixmap: textures/TileableLinearApertureGrille15Wide8And5d5SpacingResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearApertureGrille15Wide8And5d5Spacing.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearSlotMaskTall15Wide9And4d5Horizontal9d14VerticalSpacingResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearSlotMaskTall15Wide9And4d5Horizontal9d14VerticalSpacing.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearShadowMaskEDPResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearShadowMaskEDP.png
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filter: linear
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wrap: repeat
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// Pass6: Lanczos-resize the phosphor mask horizontally. scale_x6 = scale_y5.
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// TODO: Check again if the shaders actually require equal scales.
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program
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filter: nearest
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vertex: mask-resize-horizontal.vs
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fragment: mask-resize-horizontal.fs
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format: rgba16f
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// Pass7: Resample (misconverged) scanlines horizontally, apply halation, and
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// apply the phosphor mask.
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program
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filter: linear
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format: rgba16f
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height: 100%
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width: 100%
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vertex: scanlines-horizontal-apply-mask.vs
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fragment: scanlines-horizontal-apply-mask.fs
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pixmap: textures/TileableLinearApertureGrille15Wide8And5d5SpacingResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearApertureGrille15Wide8And5d5Spacing.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearSlotMaskTall15Wide9And4d5Horizontal9d14VerticalSpacingResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearSlotMaskTall15Wide9And4d5Horizontal9d14VerticalSpacing.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearShadowMaskEDPResizeTo64.png
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filter: linear
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wrap: repeat
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pixmap: textures/TileableLinearShadowMaskEDP.png
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filter: linear
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wrap: repeat
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// Pass 8: Compute a brightpass. This will require reading the final mask.
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program
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filter: linear
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format: rgba16f
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vertex: brightpass.vs
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fragment: brightpass.fs
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// Pass 9: Blur the brightpass vertically
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program
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filter: linear
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format: rgba16f
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vertex: bloom-vertical.vs
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fragment: bloom-vertical.fs
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// Pass 10: Blur the brightpass horizontally and combine it with the dimpass:
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program
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filter: linear
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format: rgba16f
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height: 100%
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width: 100%
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vertex: bloom-horizontal-reconstitute.vs
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fragment: bloom-horizontal-reconstitute.fs
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// Pass 11: Compute curvature/AA:
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program
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filter: linear
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format: rgba16f
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vertex: geometry-aa-last-pass.vs
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fragment: geometry-aa-last-pass.fs
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output
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filter: nearest |