Add n64 3-point and relief shaders

- Known N64 3-point texture filter, now in slang;
- Relief shader. Gives some bump to pixel art games.

edge-smoothing/ddt/3-point.slangp

@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = shaders/3-point.slang
+filter_linear0 = false
+scale_type0 = viewport

edge-smoothing/ddt/shaders/3-point.slang

@@ -0,0 +1,78 @@
+#version 450
+
+/*
+   N64 3-point Shader
+
+   Implemented by Hyllian - 2024
+*/
+
+layout(push_constant) uniform Push
+{
+    vec4 SourceSize;
+    vec4 OriginalSize;
+    vec4 OutputSize;
+    uint FrameCount;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+    mat4 MVP;
+} global;
+
+vec3 three_point(vec2 fp, vec3 A, vec3 B, vec3 C)
+{
+    return (A + fp.x*(B-A) + fp.y*(C-A));
+}
+
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+layout(location = 1) out vec4 t1;
+layout(location = 2) out vec2 loc;
+
+void main()
+{
+    gl_Position = global.MVP * Position;
+    vTexCoord = TexCoord * 1.0001;
+   
+    vec2 ps = vec2(params.SourceSize.z, params.SourceSize.w);
+    float dx = ps.x;
+    float dy = ps.y;
+
+    t1.xy = vec2( dx,  0); // F
+    t1.zw = vec2(  0, dy); // H
+    loc = vTexCoord*params.SourceSize.xy;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec4 t1;
+layout(location = 2) in vec2 loc;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+    vec2 tc = (floor(loc-vec2(0.5,0.5))+vec2(0.5,0.5));
+
+    vec2 fp = loc - tc;
+
+    tc = tc/params.SourceSize.xy;
+
+    vec2 dx = vec2(1.0, 0.0)/params.SourceSize.xy;
+    vec2 dy = vec2(0.0, 1.0)/params.SourceSize.xy;
+
+    vec3 E  = texture(Source, tc          ).rgb;
+    vec3 F  = texture(Source, tc + dx     ).rgb;
+    vec3 H  = texture(Source, tc      + dy).rgb;
+    vec3 I  = texture(Source, tc + dx + dy).rgb;
+
+    //  E  F 
+    //  H  I 
+
+    vec3 res = mix(three_point(fp, E, F, H), three_point(1-fp, I, H, F), step(1.0, fp.x+fp.y));
+
+    FragColor = vec4(res, 1.0);
+}

misc/relief.slangp

@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = shaders/relief.slang
+filter_linear0 = false
+scale_type0 = viewport

misc/shaders/relief.slang

@@ -0,0 +1,96 @@
+#version 450
+
+/*
+   Hyllian's Relief Shader
+   
+   Copyright (C) 2024 Hyllian
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+layout(push_constant) uniform Push
+{
+    vec4 SourceSize;
+    vec4 OriginalSize;
+    vec4 OutputSize;
+    uint FrameCount;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+    mat4 MVP;
+} global;
+
+vec3 three_point(vec2 fp, vec3 A, vec3 B, vec3 C)
+{
+    return (A + fp.x*(B-A) + fp.y*(C-A));
+}
+
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+layout(location = 1) out vec4 t1;
+layout(location = 2) out vec2 loc;
+
+void main()
+{
+    gl_Position = global.MVP * Position;
+    vTexCoord = TexCoord * 1.0001;
+   
+    vec2 ps = vec2(params.SourceSize.z, params.SourceSize.w);
+    float dx = ps.x;
+    float dy = ps.y;
+
+    t1.xy = vec2( dx,  0); // F
+    t1.zw = vec2(  0, dy); // H
+    loc = vTexCoord*params.SourceSize.xy;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec4 t1;
+layout(location = 2) in vec2 loc;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+    vec2 tc = (floor(loc)+vec2(0.5,0.5));
+
+    vec2 fp = loc - tc;
+
+    tc = tc/params.SourceSize.xy;
+
+    vec2 dx = vec2(sign(fp.x), 0.0)/params.SourceSize.xy;
+    vec2 dy = vec2(0.0, sign(fp.y))/params.SourceSize.xy;
+
+    vec3 E  = texture(Source, tc          ).rgb;
+    vec3 F  = texture(Source, tc + dx     ).rgb;
+    vec3 H  = texture(Source, tc      + dy).rgb;
+    vec3 I  = texture(Source, tc + dx + dy).rgb;
+
+    //  E  F 
+    //  H  I 
+
+    vec3 res = mix(three_point(fp, E, F, H), three_point(1-fp, I, H, F), step(1.0, fp.x+fp.y));
+
+    FragColor = vec4(res, 1.0);
+}