From 35ee6b3d361b13c6380cf357ef05c9681639cfc1 Mon Sep 17 00:00:00 2001 From: Dylan Baker Date: Tue, 21 Apr 2020 23:32:45 -0700 Subject: [PATCH] mesa: Follow OpenGL conversion rules for values that exceed storage size Section 2.2.2 (Data Conversions For State Query Commands) of the OpenGL 4.5 spec says: Following these steps, if a value is so large in magnitude that it cannot be represented by the returned data type, then the nearest value representable using that type is returned. The current code doesn't do the correct thing, because it truncates a long (potentially a 64bit values) to an int. Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2828 Fixes: 53c36dfcfe3eb3749a53267f054870280afb0d71 ("replace IROUND with util functions") Reviewed-by: Matt Turner Part-of: --- src/mesa/main/texparam.c | 37 +++++++++++++++++++++++++++++++++---- 1 file changed, 33 insertions(+), 4 deletions(-) diff --git a/src/mesa/main/texparam.c b/src/mesa/main/texparam.c index 7e06240..ae3fa82 100644 --- a/src/mesa/main/texparam.c +++ b/src/mesa/main/texparam.c @@ -45,6 +45,7 @@ #include "main/teximage.h" #include "main/texstate.h" #include "program/prog_instruction.h" +#include "util/u_math.h" /** @@ -2423,16 +2424,30 @@ get_tex_parameteriv(struct gl_context *ctx, goto invalid_pname; /* GL spec 'Data Conversions' section specifies that floating-point * value in integer Get function is rounded to nearest integer + * + * Section 2.2.2 (Data Conversions For State Query Commands) of the + * OpenGL 4.5 spec says: + * + * Following these steps, if a value is so large in magnitude that + * it cannot be represented by the returned data type, then the + * nearest value representable using that type is returned. */ - *params = lroundf(obj->Sampler.MinLod); + *params = CLAMP(lroundf(obj->Sampler.MinLod), INT_MIN, INT_MAX); break; case GL_TEXTURE_MAX_LOD: if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx)) goto invalid_pname; /* GL spec 'Data Conversions' section specifies that floating-point * value in integer Get function is rounded to nearest integer + * + * Section 2.2.2 (Data Conversions For State Query Commands) of the + * OpenGL 4.5 spec says: + * + * Following these steps, if a value is so large in magnitude that + * it cannot be represented by the returned data type, then the + * nearest value representable using that type is returned. */ - *params = lroundf(obj->Sampler.MaxLod); + *params = CLAMP(lroundf(obj->Sampler.MaxLod), INT_MIN, INT_MAX); break; case GL_TEXTURE_BASE_LEVEL: if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx)) @@ -2448,8 +2463,15 @@ get_tex_parameteriv(struct gl_context *ctx, goto invalid_pname; /* GL spec 'Data Conversions' section specifies that floating-point * value in integer Get function is rounded to nearest integer + * + * Section 2.2.2 (Data Conversions For State Query Commands) of the + * OpenGL 4.5 spec says: + * + * Following these steps, if a value is so large in magnitude that + * it cannot be represented by the returned data type, then the + * nearest value representable using that type is returned. */ - *params = lroundf(obj->Sampler.MaxAnisotropy); + *params = CLAMP(lroundf(obj->Sampler.MaxAnisotropy), INT_MIN, INT_MAX); break; case GL_GENERATE_MIPMAP_SGIS: if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES) @@ -2486,8 +2508,15 @@ get_tex_parameteriv(struct gl_context *ctx, /* GL spec 'Data Conversions' section specifies that floating-point * value in integer Get function is rounded to nearest integer + * + * Section 2.2.2 (Data Conversions For State Query Commands) of the + * OpenGL 4.5 spec says: + * + * Following these steps, if a value is so large in magnitude that + * it cannot be represented by the returned data type, then the + * nearest value representable using that type is returned. */ - *params = lroundf(obj->Sampler.LodBias); + *params = CLAMP(lroundf(obj->Sampler.LodBias), INT_MIN, INT_MAX); break; case GL_TEXTURE_CROP_RECT_OES: if (ctx->API != API_OPENGLES || !ctx->Extensions.OES_draw_texture) -- 2.7.4