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metal: reallocate textures if they grow

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This commit is contained in:
Mitchell Hashimoto
2022-10-31 10:42:27 -07:00
parent 9e628635c2
commit 8dd68ea5fe
1 changed files with 21 additions and 5 deletions
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26
src/renderer/Metal.zig
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@ -393,11 +393,11 @@ pub fn render(
// If our font atlas changed, sync the texture data
if (self.font_group.atlas_greyscale.modified) {
try syncAtlasTexture(&self.font_group.atlas_greyscale, &self.texture_greyscale);
try syncAtlasTexture(self.device, &self.font_group.atlas_greyscale, &self.texture_greyscale);
self.font_group.atlas_greyscale.modified = false;
}
if (self.font_group.atlas_color.modified) {
try syncAtlasTexture(&self.font_group.atlas_color, &self.texture_color);
try syncAtlasTexture(self.device, &self.font_group.atlas_color, &self.texture_color);
self.font_group.atlas_color.modified = false;
}
@ -755,7 +755,19 @@ fn syncCells(self: *Metal) !void {
// If we need more bytes than our buffer has, we need to reallocate.
if (req_bytes > avail_bytes) {
@panic("TODO: reallocate buffer");
// Deallocate previous buffer
deinitMTLResource(self.buf_cells);
// Allocate a new buffer with enough to hold double what we require.
const size = req_bytes * 2;
self.buf_cells = self.device.msgSend(
objc.Object,
objc.sel("newBufferWithLength:options:"),
.{
@intCast(c_ulong, size * @sizeOf(GPUCell)),
MTLResourceStorageModeShared,
},
);
}
// We can fit within the vertex buffer so we can just replace bytes.
@ -770,10 +782,14 @@ fn syncCells(self: *Metal) !void {
/// Sync the atlas data to the given texture. This copies the bytes
/// associated with the atlas to the given texture. If the atlas no longer
/// fits into the texture, the texture will be resized.
fn syncAtlasTexture(atlas: *const Atlas, texture: *objc.Object) !void {
fn syncAtlasTexture(device: objc.Object, atlas: *const Atlas, texture: *objc.Object) !void {
const width = texture.getProperty(c_ulong, "width");
if (atlas.size > width) {
@panic("TODO: reallocate texture");
// Free our old texture
deinitMTLResource(texture.*);
// Reallocate
texture.* = try initAtlasTexture(device, atlas);
}
texture.msgSend(