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Code Issues 154 Wiki Activity

Let the instances drawn from the GPU hide one another, in two phases

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Hirek
2026-10-17 21:50:23 +02:00
parent 918c056b83
commit 5a5c67aaaf
14 changed files with 367 additions and 129 deletions
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45
shaders/instance_cull_commands.comp
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@@ -1,6 +1,9 @@
// fills in the instances of the indirect draw commands of the entries, after stage 1 of instance_cull.comp wrote the
// modelview matrices of the instances which passed. one invocation per command: the instance count is the count of its
// entry, the base instance the first slot of the entry in the output (its cursor, advanced by stage 1, less the count)
// fills in the instances of the indirect draw commands of the entries, after instance_cull.comp wrote the modelview
// matrices of the instances drawn. one invocation per command. the commands are kept three times over: the first copy
// draws the instances of stage 1, the second all of them, the third those of stage 2 (two phases), each from its first
// slot in the output on. stage 0 (after stage 1): the instance count of the first copy is how far stage 1 advanced the
// cursor of its entry, the base instance the first slot of the entry. stage 1 (after stage 2): the other two copies take
// the command of the first one, the second with the instances of both stages, the third with the ones past the first copy
#include <common>
@@ -18,9 +21,18 @@ layout(std430, binding = INSTANCE_COMMAND_SSBO_BINDING) buffer instance_command_
uint commands[];
};
// x: commands, y: entries
// x: commands (of one copy), y: entries, z: stage
layout(location = 0) uniform uvec4 counts;
void set_instances(uint field, uint count, uint base)
{
commands[field + 1u] = count;
if (commands[field + 6u] != 0u)
commands[field + 4u] = base;
else
commands[field + 3u] = base;
}
void main()
{
uint command = gl_GlobalInvocationID.x;
@@ -29,11 +41,22 @@ void main()
uint field = command * 8u;
uint entry = commands[field + 5u];
uint count = counters[INSTANCE_COUNTER_HEADER + entry];
uint base = counters[INSTANCE_COUNTER_HEADER + counts.y + entry] - count;
commands[field + 1u] = count;
if (commands[field + 6u] != 0u)
commands[field + 4u] = base;
else
commands[field + 3u] = base;
uint first = counters[INSTANCE_COUNTER_HEADER + 2u * counts.y + entry];
uint count = counters[INSTANCE_COUNTER_HEADER + counts.y + entry] - first;
if (counts.z == 0u)
{
set_instances(field, count, first);
return;
}
uint drawnfirst = commands[field + 1u];
uint all = (counts.x + command) * 8u;
uint second = (2u * counts.x + command) * 8u;
for (uint value = 0u; value < 8u; ++value)
{
commands[all + value] = commands[field + value];
commands[second + value] = commands[field + value];
}
set_instances(all, count, first);
set_instances(second, count - drawnfirst, first + drawnfirst);
}