Lower max_color_attachments limit for GL to 4 (backport of #6994) (#7169)

Co-authored-by: Adrian Wielgosik <[email protected]>

Author: 2 people

CHANGELOG.md

@@ -40,9 +40,10 @@ Bottom level categories:
 
 ## Unreleased
 
-### v24.0.2  (2025-02-??)
+### v24.0.2 (2025-02-26)
 
 #### Bug Fixes
+- Fix GLES renderpass clears causing violation of `max_color_attachments` limit. By @adrian17 in [#6994](https://github.com/gfx-rs/wgpu/pull/6994).
 - Fix a possible deadlock within `Queue::write_texture`. By @metamuffin in [#7004](https://github.com/gfx-rs/wgpu/pull/7004)
 
 ### v24.0.1 (2025-01-22)

wgpu-hal/src/gles/adapter.rs

@@ -824,6 +824,7 @@ impl super::Adapter {
                     private_caps,
                     workarounds,
                     features,
+                    limits: limits.clone(),
                     shading_language_version,
                     next_shader_id: Default::default(),
                     program_cache: Default::default(),

wgpu-hal/src/gles/mod.rs

@@ -271,6 +271,7 @@ struct AdapterShared {
     context: AdapterContext,
     private_caps: PrivateCapabilities,
     features: wgt::Features,
+    limits: wgt::Limits,
     workarounds: Workarounds,
     shading_language_version: naga::back::glsl::Version,
     next_shader_id: AtomicU32,

wgpu-hal/src/gles/queue.rs

@@ -1078,8 +1078,8 @@ impl super::Queue {
                             0,
                         )
                     };
-                    for i in 0..crate::MAX_COLOR_ATTACHMENTS {
-                        let target = glow::COLOR_ATTACHMENT0 + i as u32;
+                    for i in 0..self.shared.limits.max_color_attachments {
+                        let target = glow::COLOR_ATTACHMENT0 + i;
                         unsafe {
                             gl.framebuffer_texture_2d(
                                 glow::DRAW_FRAMEBUFFER,