DRW: generalize selecting between regular/clipped shaders

Each engine was doing this on its own.
Move to DRWContextState, use an enum.

2 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index bc1b156c1f6..72c55657748 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -567,6 +567,16 @@ bool DRW_state_show_text(void);
 bool DRW_state_draw_support(void);
 bool DRW_state_draw_background(void);
 
+/**
+ * Support selecting shaders with different options compiled in.
+ * Needed for clipping support because it means using a separate set of shaders.
+ */
+typedef enum eDRW_ShaderSlot {
+	DRW_SHADER_SLOT_DEFAULT = 0,
+	DRW_SHADER_SLOT_CLIPPED = 1,
+} eDRW_ShaderSlot;
+#define DRW_SHADER_SLOT_LEN 2
+
 /* Avoid too many lookups while drawing */
 typedef struct DRWContextState {
 
@@ -586,6 +596,8 @@ typedef struct DRWContextState {
 
 	eObjectMode object_mode;
 
+	eDRW_ShaderSlot shader_slot;
+
 	/* Last resort (some functions take this as an arg so we can't easily avoid).
 	 * May be NULL when used for selection or depth buffer. */
 	const struct bContext *evil_C;
diff --git a/source/blender/draw/intern/draw_manager.c b/source/blender/draw/intern/draw_manager.c
index 4f79f4e46c1..c47ab00c841 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -543,6 +543,11 @@ static void drw_context_state_init(void)
 	else {
 		DST.draw_ctx.object_pose = NULL;
 	}
+
+	DST.draw_ctx.shader_slot = DRW_SHADER_SLOT_DEFAULT;
+	if (DST.draw_ctx.rv3d && DST.draw_ctx.rv3d->rflag & RV3D_CLIPPING) {
+		DST.draw_ctx.shader_slot = DRW_SHADER_SLOT_CLIPPED;
+	}
 }
 
 /* It also stores viewport variable to an immutable place: DST