From cf77b67c459d481f6d8d34d13e14d22a6cad0842 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Tue, 3 Dec 2019 15:22:02 +0100
Subject: Fix T71576 Mesh error on mutimaterial Meshes on legacy nvidia drivers

Differential Revision: https://developer.blender.org/D6351
---
 source/blender/draw/intern/shaders/common_view_lib.glsl |  9 ++++++---
 source/blender/gpu/GPU_extensions.h                     |  1 +
 source/blender/gpu/intern/gpu_extensions.c              | 15 +++++++++++++++
 source/blender/gpu/intern/gpu_shader.c                  |  5 ++++-
 4 files changed, 26 insertions(+), 4 deletions(-)

(limited to 'source')

diff --git a/source/blender/draw/intern/shaders/common_view_lib.glsl b/source/blender/draw/intern/shaders/common_view_lib.glsl
index 1a28a307163..182a4c72fe5 100644
--- a/source/blender/draw/intern/shaders/common_view_lib.glsl
+++ b/source/blender/draw/intern/shaders/common_view_lib.glsl
@@ -80,7 +80,7 @@ uniform int baseInstance;
 #  if defined(IN_PLACE_INSTANCES) || defined(INSTANCED_ATTRIB)
 /* When drawing instances of an object at the same position. */
 #    define instanceId 0
-#  elif defined(GPU_DEPRECATED_AMD_DRIVER)
+#  elif defined(GPU_DEPRECATED_AMD)
 /* A driver bug make it so that when using an attribute with GL_INT_2_10_10_10_REV as format,
  * the gl_InstanceID is incremented by the 2 bit component of the attrib.
  * Ignore gl_InstanceID then. */
@@ -115,8 +115,11 @@ flat in int resourceIDFrag;
 #  define resource_id resourceIDFrag
 #endif
 
-#if !defined(GPU_INTEL) && !defined(GPU_DEPRECATED_AMD_DRIVER) && !defined(OS_MAC) && \
-    !defined(INSTANCED_ATTRIB)
+#if !defined(GPU_INTEL) && !defined(GPU_DEPRECATED_AMD) && !defined(GPU_DEPRECATED_NVIDIA)
+#  define USE_INDEXED_MODELMAT
+#endif
+
+#if defined(USE_INDEXED_MODELMAT) && !defined(OS_MAC) && !defined(INSTANCED_ATTRIB)
 struct ObjectMatrices {
   mat4 drw_modelMatrix;
   mat4 drw_modelMatrixInverse;
diff --git a/source/blender/gpu/GPU_extensions.h b/source/blender/gpu/GPU_extensions.h
index 245f7f47510..692cd159fbf 100644
--- a/source/blender/gpu/GPU_extensions.h
+++ b/source/blender/gpu/GPU_extensions.h
@@ -48,6 +48,7 @@ bool GPU_mip_render_workaround(void);
 bool GPU_depth_blitting_workaround(void);
 bool GPU_unused_fb_slot_workaround(void);
 bool GPU_context_local_shaders_workaround(void);
+bool GPU_legacy_nvidia_driver(void);
 bool GPU_crappy_amd_driver(void);
 
 bool GPU_mem_stats_supported(void);
diff --git a/source/blender/gpu/intern/gpu_extensions.c b/source/blender/gpu/intern/gpu_extensions.c
index 33f918559f7..7eb2cd61fda 100644
--- a/source/blender/gpu/intern/gpu_extensions.c
+++ b/source/blender/gpu/intern/gpu_extensions.c
@@ -93,6 +93,8 @@ static struct GPUGlobal {
   /* Some crappy Intel drivers don't work well with shaders created in different
    * rendering contexts. */
   bool context_local_shaders_workaround;
+  /* Unmaintained NVIDIA drivers contain certain bugs we need to workaround. */
+  bool legacy_nvidia_driver;
 } GG = {1, 0};
 
 static void gpu_detect_mip_render_workaround(void)
@@ -216,6 +218,11 @@ bool GPU_context_local_shaders_workaround(void)
   return GG.context_local_shaders_workaround;
 }
 
+bool GPU_legacy_nvidia_driver(void)
+{
+  return GG.legacy_nvidia_driver;
+}
+
 bool GPU_crappy_amd_driver(void)
 {
   /* Currently are the same drivers with the `unused_fb_slot` problem. */
@@ -281,6 +288,14 @@ void gpu_extensions_init(void)
   GG.glew_arb_base_instance_is_supported = GLEW_ARB_base_instance;
   gpu_detect_mip_render_workaround();
 
+  if (GPU_type_matches(GPU_DEVICE_NVIDIA, GPU_OS_ANY, GPU_DRIVER_OFFICIAL)) {
+    char *driver_version_str = strstr(version, "NVIDIA ") + 7;
+    int driver_major_version = (int)strtol(driver_version_str, NULL, 10);
+    if (driver_major_version > 0 && driver_major_version < 400) {
+      GG.legacy_nvidia_driver = true;
+    }
+  }
+
   if (G.debug & G_DEBUG_GPU_FORCE_WORKAROUNDS) {
     printf("\n");
     printf("GPU: Bypassing workaround detection.\n");
diff --git a/source/blender/gpu/intern/gpu_shader.c b/source/blender/gpu/intern/gpu_shader.c
index ae2c7864e36..adbb978dded 100644
--- a/source/blender/gpu/intern/gpu_shader.c
+++ b/source/blender/gpu/intern/gpu_shader.c
@@ -243,11 +243,14 @@ static void gpu_shader_standard_defines(char defines[MAX_DEFINE_LENGTH])
   if (GPU_type_matches(GPU_DEVICE_ATI, GPU_OS_ANY, GPU_DRIVER_ANY)) {
     strcat(defines, "#define GPU_ATI\n");
     if (GPU_crappy_amd_driver()) {
-      strcat(defines, "#define GPU_DEPRECATED_AMD_DRIVER\n");
+      strcat(defines, "#define GPU_DEPRECATED_AMD\n");
     }
   }
   else if (GPU_type_matches(GPU_DEVICE_NVIDIA, GPU_OS_ANY, GPU_DRIVER_ANY)) {
     strcat(defines, "#define GPU_NVIDIA\n");
+    if (GPU_legacy_nvidia_driver()) {
+      strcat(defines, "#define GPU_DEPRECATED_NVIDIA\n");
+    }
   }
   else if (GPU_type_matches(GPU_DEVICE_INTEL, GPU_OS_ANY, GPU_DRIVER_ANY)) {
     strcat(defines, "#define GPU_INTEL\n");
-- 
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