diff options
Diffstat (limited to 'glamor/glamor.c')
| -rw-r--r-- | glamor/glamor.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/glamor/glamor.c b/glamor/glamor.c index a6d97eadd..6f4f30927 100644 --- a/glamor/glamor.c +++ b/glamor/glamor.c @@ -301,6 +301,35 @@ glamor_create_screen_resources(ScreenPtr screen) return ret; } +static Bool +glamor_check_instruction_count(int gl_version) +{ + GLint max_native_alu_instructions; + + /* Avoid using glamor if the reported instructions limit is too low, + * as this would cause glamor to fallback on sw due to large shaders + * which ends up being unbearably slow. + */ + if (gl_version < 30) { + if (!epoxy_has_gl_extension("GL_ARB_fragment_program")) { + ErrorF("GL_ARB_fragment_program required\n"); + return FALSE; + } + + glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, + GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB, + &max_native_alu_instructions); + if (max_native_alu_instructions < GLAMOR_MIN_ALU_INSTRUCTIONS) { + LogMessage(X_WARNING, + "glamor requires at least %d instructions (%d reported)\n", + GLAMOR_MIN_ALU_INSTRUCTIONS, max_native_alu_instructions); + return FALSE; + } + } + + return TRUE; +} + /** Set up glamor for an already-configured GL context. */ Bool glamor_init(ScreenPtr screen, unsigned int flags) @@ -378,6 +407,9 @@ glamor_init(ScreenPtr screen, unsigned int flags) ErrorF("Require OpenGL version 2.1 or later.\n"); goto fail; } + + if (!glamor_check_instruction_count(gl_version)) + goto fail; } else { if (gl_version < 20) { ErrorF("Require Open GLES2.0 or later.\n"); |