Fix crash with OpenGL rendering in multiple threads on macOS.

On macOS we must always go through BLI_thread_local_get/set().

Differential Revision: https://developer.blender.org/D3470

source/blender/gpu/intern/gpu_framebuffer.c

@@ -42,7 +42,9 @@
 #include "GPU_shader.h"
 #include "GPU_texture.h"
 
-static ThreadLocal(GLuint) g_currentfb;
+#include "intern/gpu_private.h"
+
+static ThreadLocal(void*) g_currentfb;
 
 typedef enum {
 	GPU_FB_DEPTH_ATTACHMENT = 0,
@@ -163,6 +165,26 @@ static void gpu_print_framebuffer_error(GLenum status, char err_out[256])
 	}
 }
 
+void gpu_framebuffer_module_init(void)
+{
+    BLI_thread_local_create(g_currentfb);
+}
+
+void gpu_framebuffer_module_exit(void)
+{
+    BLI_thread_local_delete(g_currentfb);
+}
+
+static uint gpu_framebuffer_current_get()
+{
+	return GET_UINT_FROM_POINTER(BLI_thread_local_get(g_currentfb));
+}
+
+static void gpu_framebuffer_current_set(uint object)
+{
+	BLI_thread_local_set(g_currentfb, SET_UINT_IN_POINTER(object));
+}
+
 /* GPUFrameBuffer */
 
 GPUFrameBuffer *GPU_framebuffer_create(void)
@@ -188,8 +210,8 @@ void GPU_framebuffer_free(GPUFrameBuffer *fb)
 	/* This restores the framebuffer if it was bound */
 	glDeleteFramebuffers(1, &fb->object);
 
-	if (g_currentfb == fb->object) {
-		g_currentfb = 0;
+	if (gpu_framebuffer_current_get() == fb->object) {
+		gpu_framebuffer_current_set(0);
 	}
 
 	MEM_freeN(fb);
@@ -341,7 +363,7 @@ static void gpu_framebuffer_update_attachments(GPUFrameBuffer *fb)
 	GLenum gl_attachments[GPU_FB_MAX_COLOR_ATTACHMENT];
 	int numslots = 0;
 
-	BLI_assert(g_currentfb == fb->object);
+	BLI_assert(gpu_framebuffer_current_get() == fb->object);
 
 	/* Update attachments */
 	for (GPUAttachmentType type = 0; type < GPU_FB_MAX_ATTACHEMENT; ++type) {
@@ -385,10 +407,10 @@ void GPU_framebuffer_bind(GPUFrameBuffer *fb)
 	if (fb->object == 0)
 		gpu_framebuffer_init(fb);
 
-	if (g_currentfb != fb->object)
+	if (gpu_framebuffer_current_get() != fb->object)
 		glBindFramebuffer(GL_FRAMEBUFFER, fb->object);
 
-	g_currentfb = fb->object;
+	gpu_framebuffer_current_set(fb->object);
 
 	if (fb->dirty_flag != 0)
 		gpu_framebuffer_update_attachments(fb);
@@ -409,20 +431,20 @@ void GPU_framebuffer_bind(GPUFrameBuffer *fb)
 
 void GPU_framebuffer_restore(void)
 {
-	if (g_currentfb != 0) {
+	if (gpu_framebuffer_current_get() != 0) {
 		glBindFramebuffer(GL_FRAMEBUFFER, 0);
-		g_currentfb = 0;
+		gpu_framebuffer_current_set(0);
 	}
 }
 
 bool GPU_framebuffer_bound(GPUFrameBuffer *fb)
 {
-	return (fb->object == g_currentfb) && (fb->object != 0);
+	return (fb->object == gpu_framebuffer_current_get()) && (fb->object != 0);
 }
 
 unsigned int GPU_framebuffer_current_get(void)
 {
-	return g_currentfb;
+	return gpu_framebuffer_current_get();
 }
 
 bool GPU_framebuffer_check_valid(GPUFrameBuffer *fb, char err_out[256])
@@ -513,7 +535,7 @@ void GPU_framebuffer_blit(
 {
 	BLI_assert(blit_buffers != 0);
 
-	GLuint prev_fb = g_currentfb;
+	GLuint prev_fb = gpu_framebuffer_current_get();
 
 	/* Framebuffers must be up to date. This simplify this function. */
 	if (fb_read->dirty_flag != 0 || fb_read->object == 0) {
@@ -573,7 +595,7 @@ void GPU_framebuffer_blit(
 	}
 	else {
 		glBindFramebuffer(GL_FRAMEBUFFER, prev_fb);
-		g_currentfb = prev_fb;
+		gpu_framebuffer_current_set(prev_fb);
 	}
 }
 
@@ -586,13 +608,13 @@ void GPU_framebuffer_recursive_downsample(
         void (*callback)(void *userData, int level), void *userData)
 {
 	/* Framebuffer must be up to date and bound. This simplify this function. */
-	if (g_currentfb != fb->object || fb->dirty_flag != 0 || fb->object == 0) {
+	if (gpu_framebuffer_current_get() != fb->object || fb->dirty_flag != 0 || fb->object == 0) {
 		GPU_framebuffer_bind(fb);
 	}
 	/* HACK: We make the framebuffer appear not bound in order to
 	 * not trigger any error in GPU_texture_bind().  */
-	GLuint prev_fb = g_currentfb;
-	g_currentfb = 0;
+	GLuint prev_fb = gpu_framebuffer_current_get();
+	gpu_framebuffer_current_set(0);
 
 	int i;
 	int current_dim[2] = {fb->width, fb->height};
@@ -640,7 +662,7 @@ void GPU_framebuffer_recursive_downsample(
 		}
 	}
 
-	g_currentfb = prev_fb;
+	gpu_framebuffer_current_set(prev_fb);
 }
 
 /* GPUOffScreen */

source/blender/gpu/intern/gpu_init_exit.c

@@ -60,6 +60,7 @@ void GPU_init(void)
 	GPU_texture_orphans_init();
 	GPU_material_orphans_init();
 	gpu_codegen_init();
+	gpu_framebuffer_module_init();
 
 	if (G.debug & G_DEBUG_GPU)
 		gpu_debug_init();
@@ -89,6 +90,7 @@ void GPU_exit(void)
 	if (G.debug & G_DEBUG_GPU)
 		gpu_debug_exit();
 
+	gpu_framebuffer_module_exit();
 	gpu_codegen_exit();
 
 	gpu_extensions_exit(); /* must come last */

source/blender/gpu/intern/gpu_private.h

@@ -33,4 +33,8 @@ void gpu_extensions_exit(void);
 void gpu_debug_init(void);
 void gpu_debug_exit(void);
 
+/* gpu_framebuffer.c */
+void gpu_framebuffer_module_init(void);
+void gpu_framebuffer_module_exit(void);
+
 #endif  /* __GPU_PRIVATE_H__ */