1 files changed, 168 insertions, 0 deletions
diff --git a/servers/rendering/renderer_rd/shaders/environment/voxel_gi_debug.glsl b/servers/rendering/renderer_rd/shaders/environment/voxel_gi_debug.glsl
new file mode 100644
index 0000000000..fd7a2bf8ad
--- /dev/null
+++ b/servers/rendering/renderer_rd/shaders/environment/voxel_gi_debug.glsl
@@ -0,0 +1,168 @@
+#[vertex]
+
+#version 450
+
+#VERSION_DEFINES
+
+struct CellData {
+	uint position; // xyz 10 bits
+	uint albedo; //rgb albedo
+	uint emission; //rgb normalized with e as multiplier
+	uint normal; //RGB normal encoded
+};
+
+layout(set = 0, binding = 1, std140) buffer CellDataBuffer {
+	CellData data[];
+}
+cell_data;
+
+layout(set = 0, binding = 2) uniform texture3D color_tex;
+
+layout(set = 0, binding = 3) uniform sampler tex_sampler;
+
+layout(push_constant, std430) uniform Params {
+	mat4 projection;
+	uint cell_offset;
+	float dynamic_range;
+	float alpha;
+	uint level;
+	ivec3 bounds;
+	uint pad;
+}
+params;
+
+layout(location = 0) out vec4 color_interp;
+
+void main() {
+	const vec3 cube_triangles[36] = vec3[](
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, -1.0f, 1.0f),
+			vec3(-1.0f, 1.0f, 1.0f),
+			vec3(1.0f, 1.0f, -1.0f),
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, 1.0f, -1.0f),
+			vec3(1.0f, -1.0f, 1.0f),
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(1.0f, -1.0f, -1.0f),
+			vec3(1.0f, 1.0f, -1.0f),
+			vec3(1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, 1.0f, 1.0f),
+			vec3(-1.0f, 1.0f, -1.0f),
+			vec3(1.0f, -1.0f, 1.0f),
+			vec3(-1.0f, -1.0f, 1.0f),
+			vec3(-1.0f, -1.0f, -1.0f),
+			vec3(-1.0f, 1.0f, 1.0f),
+			vec3(-1.0f, -1.0f, 1.0f),
+			vec3(1.0f, -1.0f, 1.0f),
+			vec3(1.0f, 1.0f, 1.0f),
+			vec3(1.0f, -1.0f, -1.0f),
+			vec3(1.0f, 1.0f, -1.0f),
+			vec3(1.0f, -1.0f, -1.0f),
+			vec3(1.0f, 1.0f, 1.0f),
+			vec3(1.0f, -1.0f, 1.0f),
+			vec3(1.0f, 1.0f, 1.0f),
+			vec3(1.0f, 1.0f, -1.0f),
+			vec3(-1.0f, 1.0f, -1.0f),
+			vec3(1.0f, 1.0f, 1.0f),
+			vec3(-1.0f, 1.0f, -1.0f),
+			vec3(-1.0f, 1.0f, 1.0f),
+			vec3(1.0f, 1.0f, 1.0f),
+			vec3(-1.0f, 1.0f, 1.0f),
+			vec3(1.0f, -1.0f, 1.0f));
+
+	vec3 vertex = cube_triangles[gl_VertexIndex] * 0.5 + 0.5;
+#ifdef MODE_DEBUG_LIGHT_FULL
+	uvec3 posu = uvec3(gl_InstanceIndex % params.bounds.x, (gl_InstanceIndex / params.bounds.x) % params.bounds.y, gl_InstanceIndex / (params.bounds.y * params.bounds.x));
+#else
+	uint cell_index = gl_InstanceIndex + params.cell_offset;
+
+	uvec3 posu = uvec3(cell_data.data[cell_index].position & 0x7FF, (cell_data.data[cell_index].position >> 11) & 0x3FF, cell_data.data[cell_index].position >> 21);
+#endif
+
+#ifdef MODE_DEBUG_EMISSION
+	color_interp.xyz = vec3(uvec3(cell_data.data[cell_index].emission & 0x1ff, (cell_data.data[cell_index].emission >> 9) & 0x1ff, (cell_data.data[cell_index].emission >> 18) & 0x1ff)) * pow(2.0, float(cell_data.data[cell_index].emission >> 27) - 15.0 - 9.0);
+#endif
+
+#ifdef MODE_DEBUG_COLOR
+	color_interp.xyz = unpackUnorm4x8(cell_data.data[cell_index].albedo).xyz;
+#endif
+
+#ifdef MODE_DEBUG_LIGHT
+	color_interp = texelFetch(sampler3D(color_tex, tex_sampler), ivec3(posu), int(params.level));
+	color_interp.xyz *params.dynamic_range;
+#endif
+
+	float scale = (1 << params.level);
+
+	gl_Position = params.projection * vec4((vec3(posu) + vertex) * scale, 1.0);
+
+#ifdef MODE_DEBUG_LIGHT_FULL
+	if (color_interp.a == 0.0) {
+		gl_Position = vec4(0.0); //force clip and not draw
+	}
+#else
+	color_interp.a = params.alpha;
+#endif
+}
+
+#[fragment]
+
+#version 450
+
+#VERSION_DEFINES
+
+layout(location = 0) in vec4 color_interp;
+layout(location = 0) out vec4 frag_color;
+
+void main() {
+	frag_color = color_interp;
+
+#ifdef MODE_DEBUG_LIGHT_FULL
+
+	//there really is no alpha, so use dither
+
+	int x = int(gl_FragCoord.x) % 4;
+	int y = int(gl_FragCoord.y) % 4;
+	int index = x + y * 4;
+	float limit = 0.0;
+	if (x < 8) {
+		if (index == 0)
+			limit = 0.0625;
+		if (index == 1)
+			limit = 0.5625;
+		if (index == 2)
+			limit = 0.1875;
+		if (index == 3)
+			limit = 0.6875;
+		if (index == 4)
+			limit = 0.8125;
+		if (index == 5)
+			limit = 0.3125;
+		if (index == 6)
+			limit = 0.9375;
+		if (index == 7)
+			limit = 0.4375;
+		if (index == 8)
+			limit = 0.25;
+		if (index == 9)
+			limit = 0.75;
+		if (index == 10)
+			limit = 0.125;
+		if (index == 11)
+			limit = 0.625;
+		if (index == 12)
+			limit = 1.0;
+		if (index == 13)
+			limit = 0.5;
+		if (index == 14)
+			limit = 0.875;
+		if (index == 15)
+			limit = 0.375;
+	}
+	if (frag_color.a < limit) {
+		discard;
+	}
+#endif
+}