Changeset 80515 in vbox for trunk/src

Timestamp:

Aug 30, 2019 3:48:57 PM (5 years ago)

Author:

vboxsync

Message:

Devices/Graphics/shaderlib: workaround for mac OS GL driver limits

File:

• trunk/src/VBox/Devices/Graphics/shaderlib/glsl_shader.c (modified) (1 diff)

trunk/src/VBox/Devices/Graphics/shaderlib/glsl_shader.c

@@ -1073 +1073 @@
         else
         {
+#ifndef VBOX_WITH_VMSVGA
             if(This->baseShader.reg_maps.usesrelconstF) {
+#else
+            /* If GL supports only 256 constants (seen on macOS drivers for compatibility profile, which we use),
+             * then ignore the need for potential uniforms and always declare VC[256].
+             * This allows to compile Windows 10 shader which use hardcoded constants at 250+ index range.
+             * Fixes drawing problems on Windows 10 desktop.
+             *
+             * This hack is normally active only on macOS, because Windows and Linux OpenGL drivers
+             * have a more usable limit for GL compatibility context (1024+).
+             */
+            if (This->baseShader.reg_maps.usesrelconstF && gl_info->limits.glsl_vs_float_constants > 256) {
+#endif
                 /* Subtract the other potential uniforms from the max available (bools, ints, and 1 row of projection matrix).
                  * Subtract another uniform for immediate values, which have to be loaded via uniform by the driver as well.