Merge pull request #43886 from reduz/sdf-2d

Implement Signed Distance Fields for 2D shaders

1 files changed, 30 insertions, 1 deletions

diff --git a/servers/rendering/rasterizer_rd/shaders/canvas.glsl b/servers/rendering/rasterizer_rd/shaders/canvas.glsl
index 2a0f94e733..51d7193a03 100644
--- a/servers/rendering/rasterizer_rd/shaders/canvas.glsl
+++ b/servers/rendering/rasterizer_rd/shaders/canvas.glsl
@@ -233,6 +233,30 @@ MATERIAL_UNIFORMS
 } material;
 #endif
 
+vec2 screen_uv_to_sdf(vec2 p_uv) {
+	return canvas_data.screen_to_sdf * p_uv;
+}
+
+float texture_sdf(vec2 p_sdf) {
+	vec2 uv = p_sdf * canvas_data.sdf_to_tex.xy + canvas_data.sdf_to_tex.zw;
+	float d = texture(sampler2D(sdf_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), uv).r;
+	d = d * SDF_MAX_LENGTH - 1.0;
+	return d * canvas_data.tex_to_sdf;
+}
+
+vec2 texture_sdf_normal(vec2 p_sdf) {
+	vec2 uv = p_sdf * canvas_data.sdf_to_tex.xy + canvas_data.sdf_to_tex.zw;
+
+	const float EPSILON = 0.001;
+	return normalize(vec2(
+			texture(sampler2D(sdf_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), uv + vec2(EPSILON, 0.0)).r - texture(sampler2D(sdf_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), uv - vec2(EPSILON, 0.0)).r,
+			texture(sampler2D(sdf_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), uv + vec2(0.0, EPSILON)).r - texture(sampler2D(sdf_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), uv - vec2(0.0, EPSILON)).r));
+}
+
+vec2 sdf_to_screen_uv(vec2 p_sdf) {
+	return p_sdf * canvas_data.sdf_to_screen;
+}
+
 /* clang-format off */
 FRAGMENT_SHADER_GLOBALS
 /* clang-format on */
@@ -500,8 +524,13 @@ FRAGMENT_SHADER_CODE
 		color = vec4(0.0); //invisible by default due to using light mask
 	}
 
+#ifdef MODE_LIGHT_ONLY
+	color = vec4(0.0);
+#else
 	color *= canvas_data.canvas_modulation;
-#ifdef USE_LIGHTING
+#endif
+
+#if defined(USE_LIGHTING) && !defined(MODE_UNSHADED)
 
 	// Directional Lights