stuff

modules/wallpaper-engine/shaders/hdr_downsample.frag

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+
+varying vec2 v_TexCoord;
+
+uniform sampler2D g_Texture0;
+uniform vec4 g_RenderVar0;
+
+#if BICUBIC
+vec4 cubic(float v)
+{
+	vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;
+	vec4 s = n * n * n;
+	float x = s.x;
+	float y = s.y - 4.0 * s.x;
+	float z = s.z - 4.0 * s.y + 6.0 * s.x;
+	float w = 6.0 - x - y - z;
+	return vec4(x, y, z, w) * (1.0/6.0);
+}
+
+vec4 textureBicubic(vec2 texCoords)
+{
+	float sc = 0.5;
+	vec2 texSize = sc / g_RenderVar0.xy;
+	vec2 invTexSize = g_RenderVar0.xy / sc;
+
+	texCoords = texCoords * texSize - 0.5;
+
+	vec2 fxy = frac(texCoords);
+	texCoords -= fxy;
+
+	vec4 xcubic = cubic(fxy.x);
+	vec4 ycubic = cubic(fxy.y);
+
+	vec4 c = texCoords.xxyy + vec2 (-0.5, +1.5).xyxy;
+
+	vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
+	vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;
+
+	offset *= invTexSize.xxyy;
+
+	vec4 sample0 = texSample2D(g_Texture0, offset.xz);
+	vec4 sample1 = texSample2D(g_Texture0, offset.yz);
+	vec4 sample2 = texSample2D(g_Texture0, offset.xw);
+	vec4 sample3 = texSample2D(g_Texture0, offset.yw);
+
+	float sx = s.x / (s.x + s.y);
+	float sy = s.z / (s.z + s.w);
+
+	return mix(
+		mix(sample3, sample2, sx), mix(sample1, sample0, sx)
+	, sy);
+}
+#endif
+
+#if BLOOM
+uniform float g_BloomStrength; // {"material":"bloomstrength","default":2}
+uniform vec4 g_BloomBlendParams; // {"material":"blend","default":"1 1 0 1"}
+uniform vec3 g_BloomTint; // {"material":"bloomtint","default":"1 1 1"}
+#endif
+
+#if UPSAMPLE
+uniform float g_BloomScatter; // {"material":"scatter","default":1}
+#endif
+
+void main() {
+#if BICUBIC
+	vec3 albedo = textureBicubic(v_TexCoord + g_RenderVar0.xy).rgb +
+					textureBicubic(v_TexCoord + g_RenderVar0.zy).rgb +
+					textureBicubic(v_TexCoord + g_RenderVar0.xw).rgb +
+					textureBicubic(v_TexCoord + g_RenderVar0.zw).rgb;
+#else
+	vec3 albedo = texSample2D(g_Texture0, v_TexCoord + g_RenderVar0.xy).rgb +
+					texSample2D(g_Texture0, v_TexCoord + g_RenderVar0.zy).rgb +
+					texSample2D(g_Texture0, v_TexCoord + g_RenderVar0.xw).rgb +
+					texSample2D(g_Texture0, v_TexCoord + g_RenderVar0.zw).rgb;
+#endif
+
+#if UPSAMPLE
+	albedo *= 0.25 * g_BloomScatter;
+#else
+	albedo *= 0.25;
+#endif
+
+#if BLOOM
+	albedo = max(CAST3(0), albedo);
+	float brightness = max(albedo.r, max(albedo.g, albedo.b));
+	float soft = brightness - g_BloomBlendParams.y;
+	soft = clamp(soft, 0, g_BloomBlendParams.z);
+	soft = soft * soft * g_BloomBlendParams.w;
+	float contribution = max(soft, brightness - g_BloomBlendParams.x);
+	contribution /= max(brightness, 0.00001);
+	albedo *= contribution * g_BloomStrength * g_BloomTint;
+#endif
+
+	gl_FragColor = vec4(albedo, 1.0);
+}