diff options
Diffstat (limited to 'servers/rendering/renderer_rd/shaders/ssao_downsample.glsl')
| -rw-r--r-- | servers/rendering/renderer_rd/shaders/ssao_downsample.glsl | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/servers/rendering/renderer_rd/shaders/ssao_downsample.glsl b/servers/rendering/renderer_rd/shaders/ssao_downsample.glsl new file mode 100644 index 0000000000..cb2d31f70d --- /dev/null +++ b/servers/rendering/renderer_rd/shaders/ssao_downsample.glsl @@ -0,0 +1,206 @@ +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// Copyright (c) 2016, Intel Corporation +// 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. +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// File changes (yyyy-mm-dd) +// 2016-09-07: filip.strugar@intel.com: first commit +// 2020-12-05: clayjohn: convert to Vulkan and Godot +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +#[compute] + +#version 450 + +VERSION_DEFINES + +layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in; + +layout(push_constant, binding = 1, std430) uniform Params { + vec2 pixel_size; + float z_far; + float z_near; + bool orthogonal; + float radius_sq; + uvec2 pad; +} +params; + +layout(set = 0, binding = 0) uniform sampler2D source_depth; + +layout(r16f, set = 1, binding = 0) uniform restrict writeonly image2DArray dest_image0; //rename +#ifdef GENERATE_MIPS +layout(r16f, set = 2, binding = 0) uniform restrict writeonly image2DArray dest_image1; +layout(r16f, set = 2, binding = 1) uniform restrict writeonly image2DArray dest_image2; +layout(r16f, set = 2, binding = 2) uniform restrict writeonly image2DArray dest_image3; +#endif + +vec4 screen_space_to_view_space_depth(vec4 p_depth) { + if (params.orthogonal) { + vec4 depth = p_depth * 2.0 - 1.0; + return ((depth + (params.z_far + params.z_near) / (params.z_far - params.z_near)) * (params.z_far - params.z_near)) / 2.0; + } + + float depth_linearize_mul = params.z_near; + float depth_linearize_add = params.z_far; + + // Optimised version of "-cameraClipNear / (cameraClipFar - projDepth * (cameraClipFar - cameraClipNear)) * cameraClipFar" + + // Set your depth_linearize_mul and depth_linearize_add to: + // depth_linearize_mul = ( cameraClipFar * cameraClipNear) / ( cameraClipFar - cameraClipNear ); + // depth_linearize_add = cameraClipFar / ( cameraClipFar - cameraClipNear ); + + return depth_linearize_mul / (depth_linearize_add - p_depth); +} + +float screen_space_to_view_space_depth(float p_depth) { + if (params.orthogonal) { + float depth = p_depth * 2.0 - 1.0; + return ((depth + (params.z_far + params.z_near) / (params.z_far - params.z_near)) * (params.z_far - params.z_near)) / (2.0 * params.z_far); + } + + float depth_linearize_mul = params.z_near; + float depth_linearize_add = params.z_far; + + return depth_linearize_mul / (depth_linearize_add - p_depth); +} + +#ifdef GENERATE_MIPS + +shared float depth_buffer[4][8][8]; + +float mip_smart_average(vec4 p_depths) { + float closest = min(min(p_depths.x, p_depths.y), min(p_depths.z, p_depths.w)); + float fallof_sq = -1.0f / params.radius_sq; + vec4 dists = p_depths - closest.xxxx; + vec4 weights = clamp(dists * dists * fallof_sq + 1.0, 0.0, 1.0); + return dot(weights, p_depths) / dot(weights, vec4(1.0, 1.0, 1.0, 1.0)); +} + +void prepare_depths_and_mips(vec4 p_samples, uvec2 p_output_coord, uvec2 p_gtid) { + p_samples = screen_space_to_view_space_depth(p_samples); + + depth_buffer[0][p_gtid.x][p_gtid.y] = p_samples.w; + depth_buffer[1][p_gtid.x][p_gtid.y] = p_samples.z; + depth_buffer[2][p_gtid.x][p_gtid.y] = p_samples.x; + depth_buffer[3][p_gtid.x][p_gtid.y] = p_samples.y; + + imageStore(dest_image0, ivec3(p_output_coord.x, p_output_coord.y, 0), vec4(p_samples.w)); + imageStore(dest_image0, ivec3(p_output_coord.x, p_output_coord.y, 1), vec4(p_samples.z)); + imageStore(dest_image0, ivec3(p_output_coord.x, p_output_coord.y, 2), vec4(p_samples.x)); + imageStore(dest_image0, ivec3(p_output_coord.x, p_output_coord.y, 3), vec4(p_samples.y)); + + uint depth_array_index = 2 * (p_gtid.y % 2) + (p_gtid.x % 2); + uvec2 depth_array_offset = ivec2(p_gtid.x % 2, p_gtid.y % 2); + ivec2 buffer_coord = ivec2(p_gtid) - ivec2(depth_array_offset); + + p_output_coord /= 2; + groupMemoryBarrier(); + barrier(); + + // if (still_alive) <-- all threads alive here + { + float sample_00 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 0]; + float sample_01 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 1]; + float sample_10 = depth_buffer[depth_array_index][buffer_coord.x + 1][buffer_coord.y + 0]; + float sample_11 = depth_buffer[depth_array_index][buffer_coord.x + 1][buffer_coord.y + 1]; + + float avg = mip_smart_average(vec4(sample_00, sample_01, sample_10, sample_11)); + imageStore(dest_image1, ivec3(p_output_coord.x, p_output_coord.y, depth_array_index), vec4(avg)); + depth_buffer[depth_array_index][buffer_coord.x][buffer_coord.y] = avg; + } + + bool still_alive = p_gtid.x % 4 == depth_array_offset.x && p_gtid.y % 4 == depth_array_offset.y; + + p_output_coord /= 2; + groupMemoryBarrier(); + barrier(); + + if (still_alive) { + float sample_00 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 0]; + float sample_01 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 2]; + float sample_10 = depth_buffer[depth_array_index][buffer_coord.x + 2][buffer_coord.y + 0]; + float sample_11 = depth_buffer[depth_array_index][buffer_coord.x + 2][buffer_coord.y + 2]; + + float avg = mip_smart_average(vec4(sample_00, sample_01, sample_10, sample_11)); + imageStore(dest_image2, ivec3(p_output_coord.x, p_output_coord.y, depth_array_index), vec4(avg)); + depth_buffer[depth_array_index][buffer_coord.x][buffer_coord.y] = avg; + } + + still_alive = p_gtid.x % 8 == depth_array_offset.x && depth_array_offset.y % 8 == depth_array_offset.y; + + p_output_coord /= 2; + groupMemoryBarrier(); + barrier(); + + if (still_alive) { + float sample_00 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 0]; + float sample_01 = depth_buffer[depth_array_index][buffer_coord.x + 0][buffer_coord.y + 4]; + float sample_10 = depth_buffer[depth_array_index][buffer_coord.x + 4][buffer_coord.y + 0]; + float sample_11 = depth_buffer[depth_array_index][buffer_coord.x + 4][buffer_coord.y + 4]; + + float avg = mip_smart_average(vec4(sample_00, sample_01, sample_10, sample_11)); + imageStore(dest_image3, ivec3(p_output_coord.x, p_output_coord.y, depth_array_index), vec4(avg)); + } +} +#else +#ifndef USE_HALF_BUFFERS +void prepare_depths(vec4 p_samples, uvec2 p_tid) { + p_samples = screen_space_to_view_space_depth(p_samples); + + imageStore(dest_image0, ivec3(p_tid, 0), vec4(p_samples.w)); + imageStore(dest_image0, ivec3(p_tid, 1), vec4(p_samples.z)); + imageStore(dest_image0, ivec3(p_tid, 2), vec4(p_samples.x)); + imageStore(dest_image0, ivec3(p_tid, 3), vec4(p_samples.y)); +} +#endif +#endif + +void main() { +#ifdef USE_HALF_BUFFERS +#ifdef USE_HALF_SIZE + float sample_00 = texelFetch(source_depth, ivec2(4 * gl_GlobalInvocationID.x + 0, 4 * gl_GlobalInvocationID.y + 0), 0).x; + float sample_11 = texelFetch(source_depth, ivec2(4 * gl_GlobalInvocationID.x + 2, 4 * gl_GlobalInvocationID.y + 2), 0).x; +#else + float sample_00 = texelFetch(source_depth, ivec2(2 * gl_GlobalInvocationID.x + 0, 2 * gl_GlobalInvocationID.y + 0), 0).x; + float sample_11 = texelFetch(source_depth, ivec2(2 * gl_GlobalInvocationID.x + 1, 2 * gl_GlobalInvocationID.y + 1), 0).x; +#endif + sample_00 = screen_space_to_view_space_depth(sample_00); + sample_11 = screen_space_to_view_space_depth(sample_11); + + imageStore(dest_image0, ivec3(gl_GlobalInvocationID.xy, 0), vec4(sample_00)); + imageStore(dest_image0, ivec3(gl_GlobalInvocationID.xy, 3), vec4(sample_11)); +#else //!USE_HALF_BUFFERS +#ifdef USE_HALF_SIZE + ivec2 depth_buffer_coord = 4 * ivec2(gl_GlobalInvocationID.xy); + ivec2 output_coord = ivec2(gl_GlobalInvocationID); + + vec2 uv = (vec2(depth_buffer_coord) + 0.5f) * params.pixel_size; + vec4 samples; + samples.x = textureLodOffset(source_depth, uv, 0, ivec2(0, 2)).x; + samples.y = textureLodOffset(source_depth, uv, 0, ivec2(2, 2)).x; + samples.z = textureLodOffset(source_depth, uv, 0, ivec2(2, 0)).x; + samples.w = textureLodOffset(source_depth, uv, 0, ivec2(0, 0)).x; +#else + ivec2 depth_buffer_coord = 2 * ivec2(gl_GlobalInvocationID.xy); + ivec2 output_coord = ivec2(gl_GlobalInvocationID); + + vec2 uv = (vec2(depth_buffer_coord) + 0.5f) * params.pixel_size; + vec4 samples = textureGather(source_depth, uv); +#endif +#ifdef GENERATE_MIPS + prepare_depths_and_mips(samples, output_coord, gl_LocalInvocationID.xy); +#else + prepare_depths(samples, gl_GlobalInvocationID.xy); +#endif +#endif +} |