Combine OpenGL shaders into single .glsl file (#687)

Kenix3/libultraship#972 changed the OpenGL backend to load a single
combined default.shader.glsl instead of separate .fs and .vs files.
The assets were never updated to match, breaking the OpenGL renderer.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 296 insertions, 0 deletions

diff --git a/assets/shaders/opengl/default.shader.glsl b/assets/shaders/opengl/default.shader.glsl
new file mode 100644
index 000000000..5e0f93f29
--- /dev/null
+++ b/assets/shaders/opengl/default.shader.glsl
@@ -0,0 +1,296 @@
+@prism(type='fragment', name='Fast3D Fragment Shader', version='1.0.0', description='Ported shader to prism', author='Emill & Prism Team')
+
+@{GLSL_VERSION}
+
+@if(VERTEX_SHADER)
+    @{attr} vec4 aVtxPos;
+
+    @for(i in 0..2)
+        @if(o_textures[i])
+            @{attr} vec2 aTexCoord@{i};
+            @{out} vec2 vTexCoord@{i};
+            @{update_floats(2)}
+            @for(j in 0..2)
+                @if(o_clamp[i][j])
+                    @if(j == 0)
+                        @{attr} float aTexClampS@{i};
+                        @{out} float vTexClampS@{i};
+                    @else
+                        @{attr} float aTexClampT@{i};
+                        @{out} float vTexClampT@{i};
+                    @end
+                    @{update_floats(1)}
+                @end
+            @end
+        @end
+    @end
+
+    @if(o_fog)
+        @{attr} vec4 aFog;
+        @{out} vec4 vFog;
+        @{update_floats(4)}
+    @end
+
+    @if(o_grayscale)
+        @{attr} vec4 aGrayscaleColor;
+        @{out} vec4 vGrayscaleColor;
+        @{update_floats(4)}
+    @end
+
+    @for(i in 0..o_inputs)
+        @if(o_alpha)
+            @{attr} vec4 aInput@{i + 1};
+            @{out} vec4 vInput@{i + 1};
+            @{update_floats(4)}
+        @else
+            @{attr} vec3 aInput@{i + 1};
+            @{out} vec3 vInput@{i + 1};
+            @{update_floats(3)}
+        @end
+    @end
+
+    void main() {
+         @for(i in 0..2)
+            @if(o_textures[i])
+                vTexCoord@{i} = aTexCoord@{i};
+                @for(j in 0..2)
+                    @if(o_clamp[i][j])
+                        @if(j == 0)
+                            vTexClampS@{i} = aTexClampS@{i};
+                        @else
+                            vTexClampT@{i} = aTexClampT@{i};
+                        @end
+                    @end
+                @end
+            @end
+        @end
+        @if(o_fog)
+            vFog = aFog;
+        @end
+        @if(o_grayscale)
+            vGrayscaleColor = aGrayscaleColor;
+        @end
+        @for(i in 0..o_inputs)
+            vInput@{i + 1} = aInput@{i + 1};
+        @end
+        gl_Position = aVtxPos;
+        @if(opengles)
+            gl_Position.z *= 0.3f;
+        @end
+    }
+@else
+    @if(core_opengl || opengles)
+    out vec4 vOutColor;
+    @end
+
+    @for(i in 0..2)
+        @if(o_textures[i])
+            @{attr} vec2 vTexCoord@{i};
+            @for(j in 0..2)
+                @if(o_clamp[i][j])
+                    @if(j == 0)
+                        @{attr} float vTexClampS@{i};
+                    @else
+                        @{attr} float vTexClampT@{i};
+                    @end
+                @end
+            @end
+        @end
+    @end
+
+    @if(o_fog) @{attr} vec4 vFog;
+    @if(o_grayscale) @{attr} vec4 vGrayscaleColor;
+
+    @for(i in 0..o_inputs)
+        @if(o_alpha)
+            @{attr} vec4 vInput@{i + 1};
+        @else
+            @{attr} vec3 vInput@{i + 1};
+        @end
+    @end
+
+    @if(o_textures[0]) uniform sampler2D uTex0;
+    @if(o_textures[1]) uniform sampler2D uTex1;
+
+    @if(o_masks[0]) uniform sampler2D uTexMask0;
+    @if(o_masks[1]) uniform sampler2D uTexMask1;
+
+    @if(o_blend[0]) uniform sampler2D uTexBlend0;
+    @if(o_blend[1]) uniform sampler2D uTexBlend1;
+
+    uniform int frame_count;
+    uniform float noise_scale;
+
+    uniform int texture_width[2];
+    uniform int texture_height[2];
+    uniform int texture_filtering[2];
+
+    #define TEX_OFFSET(off) @{texture}(tex, texCoord - off / texSize)
+    #define WRAP(x, low, high) mod((x)-(low), (high)-(low)) + (low)
+
+    float random(in vec3 value) {
+        float random = dot(sin(value), vec3(12.9898, 78.233, 37.719));
+        return fract(sin(random) * 143758.5453);
+    }
+
+    vec4 fromLinear(vec4 linearRGB){
+        bvec3 cutoff = lessThan(linearRGB.rgb, vec3(0.0031308));
+        vec3 higher = vec3(1.055)*pow(linearRGB.rgb, vec3(1.0/2.4)) - vec3(0.055);
+        vec3 lower = linearRGB.rgb * vec3(12.92);
+        return vec4(mix(higher, lower, cutoff), linearRGB.a);
+    }
+
+    vec4 filter3point(in sampler2D tex, in vec2 texCoord, in vec2 texSize) {
+        vec2 offset = fract(texCoord*texSize - vec2(0.5));
+        offset -= step(1.0, offset.x + offset.y);
+        vec4 c0 = TEX_OFFSET(offset);
+        vec4 c1 = TEX_OFFSET(vec2(offset.x - sign(offset.x), offset.y));
+        vec4 c2 = TEX_OFFSET(vec2(offset.x, offset.y - sign(offset.y)));
+        return c0 + abs(offset.x)*(c1-c0) + abs(offset.y)*(c2-c0);
+    }
+
+    vec4 hookTexture2D(in int id, sampler2D tex, in vec2 uv, in vec2 texSize) {
+    @if(o_three_point_filtering)
+        if(texture_filtering[id] == @{FILTER_THREE_POINT}) {
+            return filter3point(tex, uv, texSize);
+        }
+    @end
+        return @{texture}(tex, uv);
+    }
+
+    #define TEX_SIZE(tex) vec2(texture_width[tex], texture_height[tex])
+
+    void main() {
+        @for(i in 0..2)
+            @if(o_textures[i])
+                @{s = o_clamp[i][0]}
+                @{t = o_clamp[i][1]}
+
+                vec2 texSize@{i} = TEX_SIZE(@{i});
+
+                @if(!s && !t)
+                    vec2 vTexCoordAdj@{i} = vTexCoord@{i};
+                @else
+                    @if(s && t)
+                        vec2 vTexCoordAdj@{i} = clamp(vTexCoord@{i}, 0.5 / texSize@{i}, vec2(vTexClampS@{i}, vTexClampT@{i}));
+                    @elseif(s)
+                        vec2 vTexCoordAdj@{i} = vec2(clamp(vTexCoord@{i}.s, 0.5 / texSize@{i}.s, vTexClampS@{i}), vTexCoord@{i}.t);
+                    @else
+                        vec2 vTexCoordAdj@{i} = vec2(vTexCoord@{i}.s, clamp(vTexCoord@{i}.t, 0.5 / texSize@{i}.t, vTexClampT@{i}));
+                    @end
+                @end
+
+                vec4 texVal@{i} = hookTexture2D(@{i}, uTex@{i}, vTexCoordAdj@{i}, texSize@{i});
+
+                @if(o_masks[i])
+                    @if(opengles)
+                        vec2 maskSize@{i} = vec2(textureSize(uTexMask@{i}, 0));
+                    @else
+                        vec2 maskSize@{i} = textureSize(uTexMask@{i}, 0);
+                    @end
+
+                    vec4 maskVal@{i} = hookTexture2D(@{i}, uTexMask@{i}, vTexCoordAdj@{i}, maskSize@{i});
+
+                    @if(o_blend[i])
+                        vec4 blendVal@{i} = hookTexture2D(@{i}, uTexBlend@{i}, vTexCoordAdj@{i}, texSize@{i});
+                    @else
+                        vec4 blendVal@{i} = vec4(0, 0, 0, 0);
+                    @end
+
+                    texVal@{i} = mix(texVal@{i}, blendVal@{i}, maskVal@{i}.a);
+                @end
+            @end
+        @end
+
+        @if(o_alpha)
+            vec4 texel;
+        @else
+            vec3 texel;
+        @end
+
+        @if(o_2cyc)
+            @{f_range = 2}
+        @else
+            @{f_range = 1}
+        @end
+
+        @for(c in 0..f_range)
+            @if(c == 1)
+                @if(o_alpha)
+                    @if(o_c[c][1][2] == SHADER_COMBINED)
+                        texel.a = WRAP(texel.a, -1.01, 1.01);
+                    @else
+                        texel.a = WRAP(texel.a, -0.51, 1.51);
+                    @end
+                @end
+
+                @if(o_c[c][0][2] == SHADER_COMBINED)
+                    texel.rgb = WRAP(texel.rgb, -1.01, 1.01);
+                @else
+                    texel.rgb = WRAP(texel.rgb, -0.51, 1.51);
+                @end
+            @end
+
+            @if(!o_color_alpha_same[c] && o_alpha)
+                texel = vec4(@{
+                append_formula(o_c[c], o_do_single[c][0],
+                               o_do_multiply[c][0], o_do_mix[c][0], false, false, true, c == 0)
+                }, @{append_formula(o_c[c], o_do_single[c][1],
+                               o_do_multiply[c][1], o_do_mix[c][1], true, true, true, c == 0)
+                });
+            @else
+                texel = @{append_formula(o_c[c], o_do_single[c][0],
+                               o_do_multiply[c][0], o_do_mix[c][0], o_alpha, false,
+                               o_alpha, c == 0)};
+            @end
+        @end
+
+        texel = WRAP(texel, -0.51, 1.51);
+        texel = clamp(texel, 0.0, 1.0);
+        // TODO discard if alpha is 0?
+        @if(o_fog)
+            @if(o_alpha)
+                texel = vec4(mix(texel.rgb, vFog.rgb, vFog.a), texel.a);
+            @else
+                texel = mix(texel, vFog.rgb, vFog.a);
+            @end
+        @end
+
+        @if(o_texture_edge && o_alpha)
+            if (texel.a > 0.19) texel.a = 1.0; else discard;
+        @end
+
+        @if(o_alpha && o_noise)
+            texel.a *= floor(clamp(random(vec3(floor(gl_FragCoord.xy * noise_scale), float(frame_count))) + texel.a, 0.0, 1.0));
+        @end
+
+        @if(o_grayscale)
+            float p = float(0x19);
+            float r = texel.r*float(0x55);
+            float g = texel.g*float(0x4B);
+            float b = texel.b*float(0x5F);
+            float intensity = (r+g+b) / 256.0;
+            intensity *= 255.0/256.0;
+            intensity = pow(intensity, (p * 1.5 / 256.0) + 0.25);
+            intensity *= 31.0/32.0;
+            vec3 new_texel = vGrayscaleColor.rgb * intensity;
+            texel.rgb = mix(texel.rgb, new_texel, vGrayscaleColor.a);
+        @end
+
+        @if(o_alpha)
+            @if(o_alpha_threshold)
+                if (texel.a < 8.0 / 256.0) discard;
+            @end
+            @if(o_invisible)
+                texel.a = 0.0;
+            @end
+            @{vOutColor} = texel;
+        @else
+            @{vOutColor} = vec4(texel, 1.0);
+        @end
+
+        @if(srgb_mode)
+            @{vOutColor} = fromLinear(@{vOutColor});
+        @end
+    }
+@end