mesa: add gl_coontext::ForceIntegerTexNearest

Some applications incorrectly use GL_LINEAR* values for integers texture.
copyimage.c already implemented a tolerance for such app in prepare_target_err.

This commit adds a boolean that will treat GL_LINEAR* filters as
GL_NEAREST for integer textures.

CC: 20.1 <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4647>

1 files changed, 8 insertions, 4 deletions

diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index dfcfc4e8015..f21f83edba5 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -670,11 +670,13 @@ update_single_program_texture(struct gl_context *ctx, struct gl_program *prog,
       texUnit->Sampler : &texObj->Sampler;
 
    if (likely(texObj)) {
-      if (_mesa_is_texture_complete(texObj, sampler))
+      if (_mesa_is_texture_complete(texObj, sampler,
+                                    ctx->Const.ForceIntegerTexNearest))
          return texObj;
 
       _mesa_test_texobj_completeness(ctx, texObj);
-      if (_mesa_is_texture_complete(texObj, sampler))
+      if (_mesa_is_texture_complete(texObj, sampler,
+                                    ctx->Const.ForceIntegerTexNearest))
          return texObj;
    }
 
@@ -816,10 +818,12 @@ update_ff_texture_state(struct gl_context *ctx,
          struct gl_sampler_object *sampler = texUnit->Sampler ?
             texUnit->Sampler : &texObj->Sampler;
 
-         if (!_mesa_is_texture_complete(texObj, sampler)) {
+         if (!_mesa_is_texture_complete(texObj, sampler,
+                                        ctx->Const.ForceIntegerTexNearest)) {
             _mesa_test_texobj_completeness(ctx, texObj);
          }
-         if (_mesa_is_texture_complete(texObj, sampler)) {
+         if (_mesa_is_texture_complete(texObj, sampler,
+                                       ctx->Const.ForceIntegerTexNearest)) {
             _mesa_reference_texobj(&texUnit->_Current, texObj);
             complete = true;
             break;