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Fix shader time uniforms (#1462)

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* fix shader time uniforms

* renderer/metal: one typo

---------

Co-authored-by: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
This commit is contained in:
Jeffrey C. Ollie
2024-02-04 22:50:07 -06:00
committed by GitHub
parent efb4eab44b
commit 18005ffa35
2 changed files with 20 additions and 5 deletions
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14
src/renderer/Metal.zig
View File

@ -137,6 +137,11 @@ pub const CustomShaderState = struct {
screen_texture: objc.Object, // MTLTexture
sampler: mtl_sampler.Sampler,
uniforms: mtl_shaders.PostUniforms,
/// The first time a frame was drawn. This is used to update the time
/// uniform.
first_frame_time: std.time.Instant,
/// The last time a frame was drawn. This is used to update the time
/// uniform.
last_frame_time: std.time.Instant,
pub fn deinit(self: *CustomShaderState) void {
@ -412,6 +417,7 @@ pub fn init(alloc: Allocator, options: renderer.Options) !Metal {
.sample_rate = 1,
},
.first_frame_time = try std.time.Instant.now(),
.last_frame_time = try std.time.Instant.now(),
};
};
@ -757,10 +763,12 @@ pub fn drawFrame(self: *Metal, surface: *apprt.Surface) !void {
// If we have custom shaders, update the animation time.
if (self.custom_shader_state) |*state| {
const now = std.time.Instant.now() catch state.last_frame_time;
const since_ns: f32 = @floatFromInt(now.since(state.last_frame_time));
const now = std.time.Instant.now() catch state.first_frame_time;
const since_ns: f32 = @floatFromInt(now.since(state.first_frame_time));
const delta_ns: f32 = @floatFromInt(now.since(state.last_frame_time));
state.uniforms.time = since_ns / std.time.ns_per_s;
state.uniforms.time_delta = since_ns / std.time.ns_per_s;
state.uniforms.time_delta = delta_ns / std.time.ns_per_s;
state.last_frame_time = now;
}
// @autoreleasepool {}

11
src/renderer/opengl/custom.zig
View File

@ -45,10 +45,14 @@ pub const State = struct {
/// The set of programs for the custom shaders.
programs: []const Program,
/// The last time the frame was drawn. This is used to update
/// The first time a frame was drawn. This is used to update
/// the time uniform.
first_frame_time: std.time.Instant,
/// The last time a frame was drawn. This is used to update
/// the time uniform.
last_frame_time: std.time.Instant,
pub fn init(
alloc: Allocator,
srcs: []const [:0]const u8,
@ -136,6 +140,7 @@ pub const State = struct {
.ebo = ebo,
.fb_texture = fb_tex,
.first_frame_time = try std.time.Instant.now(),
.last_frame_time = try std.time.Instant.now(),
};
}
@ -180,8 +185,10 @@ pub const State = struct {
// Update our frame time
const now = std.time.Instant.now() catch self.first_frame_time;
const since_ns: f32 = @floatFromInt(now.since(self.first_frame_time));
const delta_ns: f32 = @floatFromInt(now.since(self.last_frame_time));
self.uniforms.time = since_ns / std.time.ns_per_s;
self.uniforms.time_delta = since_ns / std.time.ns_per_s;
self.uniforms.time_delta = delta_ns / std.time.ns_per_s;
self.last_frame_time = now;
// Sync our uniform changes
try self.syncUniforms();