shader: Fix disabled attribute default values
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		| @@ -300,7 +300,7 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) { | ||||
|         const std::optional<AttrInfo> type{AttrTypes(ctx, index)}; | ||||
|         if (!type) { | ||||
|             // Attribute is disabled | ||||
|             return ctx.Const(0.0f); | ||||
|             return ctx.Const(element == 3 ? 1.0f : 0.0f); | ||||
|         } | ||||
|         if (!ctx.runtime_info.previous_stage_stores.Generic(index, element)) { | ||||
|             // Varying component is not written | ||||
|   | ||||
| @@ -145,7 +145,7 @@ RendererOpenGL::RendererOpenGL(Core::TelemetrySession& telemetry_session_, | ||||
|     GLint max_attribs{}; | ||||
|     glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &max_attribs); | ||||
|     for (GLint attrib = 0; attrib < max_attribs; ++attrib) { | ||||
|         glVertexAttrib4f(attrib, 0.0f, 0.0f, 0.0f, 0.0f); | ||||
|         glVertexAttrib4f(attrib, 0.0f, 0.0f, 0.0f, 1.0f); | ||||
|     } | ||||
|     // Enable seamless cubemaps when per texture parameters are not available | ||||
|     if (!GLAD_GL_ARB_seamless_cubemap_per_texture && !GLAD_GL_AMD_seamless_cubemap_per_texture) { | ||||
|   | ||||
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