1 files changed, 418 insertions, 0 deletions

diff --git a/source/blender/draw/modes/paint_texture_mode.c b/source/blender/draw/modes/paint_texture_mode.c
new file mode 100644
index 00000000000..2a5eabd08fa
--- /dev/null
+++ b/source/blender/draw/modes/paint_texture_mode.c
@@ -0,0 +1,418 @@
+/*
+ * Copyright 2016, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Blender Institute
+ *
+ */
+
+/** \file blender/draw/modes/paint_texture_mode.c
+ *  \ingroup draw
+ */
+
+#include "DRW_engine.h"
+#include "DRW_render.h"
+
+#include "BIF_gl.h"
+
+/* If builtin shaders are needed */
+#include "GPU_shader.h"
+#include "GPU_texture.h"
+
+#include "draw_common.h"
+
+#include "draw_mode_engines.h"
+
+#include "DNA_mesh_types.h"
+
+extern char datatoc_common_globals_lib_glsl[];
+extern char datatoc_paint_texture_vert_glsl[];
+extern char datatoc_paint_texture_frag_glsl[];
+extern char datatoc_paint_wire_vert_glsl[];
+extern char datatoc_paint_wire_frag_glsl[];
+
+/* If needed, contains all global/Theme colors
+ * Add needed theme colors / values to DRW_globals_update() and update UBO
+ * Not needed for constant color. */
+extern struct GPUUniformBuffer *globals_ubo; /* draw_common.c */
+extern struct GlobalsUboStorage ts; /* draw_common.c */
+
+/* *********** LISTS *********** */
+/* All lists are per viewport specific datas.
+ * They are all free when viewport changes engines
+ * or is free itself. Use PAINT_TEXTURE_engine_init() to
+ * initialize most of them and PAINT_TEXTURE_cache_init()
+ * for PAINT_TEXTURE_PassList */
+
+typedef struct PAINT_TEXTURE_PassList {
+	/* Declare all passes here and init them in
+	 * PAINT_TEXTURE_cache_init().
+	 * Only contains (DRWPass *) */
+	struct DRWPass *image_faces;
+
+	struct DRWPass *wire_overlay;
+	struct DRWPass *face_overlay;
+} PAINT_TEXTURE_PassList;
+
+typedef struct PAINT_TEXTURE_FramebufferList {
+	/* Contains all framebuffer objects needed by this engine.
+	 * Only contains (GPUFrameBuffer *) */
+	struct GPUFrameBuffer *fb;
+} PAINT_TEXTURE_FramebufferList;
+
+typedef struct PAINT_TEXTURE_TextureList {
+	/* Contains all framebuffer textures / utility textures
+	 * needed by this engine. Only viewport specific textures
+	 * (not per object). Only contains (GPUTexture *) */
+	struct GPUTexture *texture;
+} PAINT_TEXTURE_TextureList;
+
+typedef struct PAINT_TEXTURE_StorageList {
+	/* Contains any other memory block that the engine needs.
+	 * Only directly MEM_(m/c)allocN'ed blocks because they are
+	 * free with MEM_freeN() when viewport is freed.
+	 * (not per object) */
+	struct CustomStruct *block;
+	struct PAINT_TEXTURE_PrivateData *g_data;
+} PAINT_TEXTURE_StorageList;
+
+typedef struct PAINT_TEXTURE_Data {
+	/* Struct returned by DRW_viewport_engine_data_ensure.
+	 * If you don't use one of these, just make it a (void *) */
+	// void *fbl;
+	void *engine_type; /* Required */
+	PAINT_TEXTURE_FramebufferList *fbl;
+	PAINT_TEXTURE_TextureList *txl;
+	PAINT_TEXTURE_PassList *psl;
+	PAINT_TEXTURE_StorageList *stl;
+} PAINT_TEXTURE_Data;
+
+/* *********** STATIC *********** */
+
+static struct {
+	/* Custom shaders :
+	 * Add sources to source/blender/draw/modes/shaders
+	 * init in PAINT_TEXTURE_engine_init();
+	 * free in PAINT_TEXTURE_engine_free(); */
+	struct GPUShader *fallback_sh;
+	struct GPUShader *image_sh;
+
+	struct GPUShader *wire_overlay_shader;
+	struct GPUShader *face_overlay_shader;
+} e_data = {NULL}; /* Engine data */
+
+typedef struct PAINT_TEXTURE_PrivateData {
+	/* This keeps the references of the shading groups for
+	 * easy access in PAINT_TEXTURE_cache_populate() */
+	DRWShadingGroup *shgroup_fallback;
+	DRWShadingGroup **shgroup_image_array;
+
+	/* face-mask  */
+	DRWShadingGroup *lwire_shgrp;
+	DRWShadingGroup *face_shgrp;
+} PAINT_TEXTURE_PrivateData; /* Transient data */
+
+/* *********** FUNCTIONS *********** */
+
+/* Init Textures, Framebuffers, Storage and Shaders.
+ * It is called for every frames.
+ * (Optional) */
+static void PAINT_TEXTURE_engine_init(void *vedata)
+{
+	PAINT_TEXTURE_TextureList *txl = ((PAINT_TEXTURE_Data *)vedata)->txl;
+	PAINT_TEXTURE_FramebufferList *fbl = ((PAINT_TEXTURE_Data *)vedata)->fbl;
+	PAINT_TEXTURE_StorageList *stl = ((PAINT_TEXTURE_Data *)vedata)->stl;
+
+	UNUSED_VARS(txl, fbl, stl);
+
+	/* Init Framebuffers like this: order is attachment order (for color texs) */
+	/*
+	 * DRWFboTexture tex[2] = {{&txl->depth, DRW_TEX_DEPTH_24, 0},
+	 *                         {&txl->color, DRW_TEX_RGBA_8, DRW_TEX_FILTER}};
+	 */
+
+	/* DRW_framebuffer_init takes care of checking if
+	 * the framebuffer is valid and has the right size*/
+	/*
+	 * float *viewport_size = DRW_viewport_size_get();
+	 * DRW_framebuffer_init(&fbl->occlude_wire_fb,
+	 *                     (int)viewport_size[0], (int)viewport_size[1],
+	 *                     tex, 2);
+	 */
+
+	if (!e_data.fallback_sh) {
+		e_data.fallback_sh = GPU_shader_get_builtin_shader(GPU_SHADER_3D_UNIFORM_COLOR);
+	}
+	if (!e_data.image_sh) {
+		e_data.image_sh = GPU_shader_get_builtin_shader(GPU_SHADER_3D_UNIFORM_COLOR);
+
+		e_data.image_sh = DRW_shader_create_with_lib(
+		        datatoc_paint_texture_vert_glsl, NULL,
+		        datatoc_paint_texture_frag_glsl,
+		        datatoc_common_globals_lib_glsl, NULL);
+
+	}
+
+	if (!e_data.wire_overlay_shader) {
+		e_data.wire_overlay_shader = DRW_shader_create_with_lib(
+		        datatoc_paint_wire_vert_glsl, NULL,
+		        datatoc_paint_wire_frag_glsl,
+		        datatoc_common_globals_lib_glsl,
+		        "#define VERTEX_MODE\n");
+	}
+
+	if (!e_data.face_overlay_shader) {
+		e_data.face_overlay_shader = GPU_shader_get_builtin_shader(GPU_SHADER_3D_UNIFORM_COLOR);
+	}
+}
+
+/* Here init all passes and shading groups
+ * Assume that all Passes are NULL */
+static void PAINT_TEXTURE_cache_init(void *vedata)
+{
+	PAINT_TEXTURE_PassList *psl = ((PAINT_TEXTURE_Data *)vedata)->psl;
+	PAINT_TEXTURE_StorageList *stl = ((PAINT_TEXTURE_Data *)vedata)->stl;
+
+	if (!stl->g_data) {
+		/* Alloc transient pointers */
+		stl->g_data = MEM_mallocN(sizeof(*stl->g_data), __func__);
+		stl->g_data->shgroup_image_array = NULL;
+	}
+
+	{
+		/* Create a pass */
+		DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS |
+		                 DRW_STATE_BLEND | DRW_STATE_WIRE;
+		psl->image_faces = DRW_pass_create("Image Color Pass", state);
+
+		stl->g_data->shgroup_fallback = DRW_shgroup_create(e_data.fallback_sh, psl->image_faces);
+
+		/* Uniforms need a pointer to it's value so be sure it's accessible at
+		 * any given time (i.e. use static vars) */
+		static float color[4] = {1.0f, 0.0f, 1.0f, 1.0};
+		DRW_shgroup_uniform_vec4(stl->g_data->shgroup_fallback, "color", color, 1);
+
+		MEM_SAFE_FREE(stl->g_data->shgroup_image_array);
+
+		const DRWContextState *draw_ctx = DRW_context_state_get();
+		Object *ob = draw_ctx->obact;
+		if (ob && ob->type == OB_MESH) {
+			Scene *scene = draw_ctx->scene;
+			const bool use_material_slots = (scene->toolsettings->imapaint.mode == IMAGEPAINT_MODE_MATERIAL);
+			const Mesh *me = ob->data;
+
+			stl->g_data->shgroup_image_array = MEM_mallocN(
+			        sizeof(*stl->g_data->shgroup_image_array) * (use_material_slots ? me->totcol : 1), __func__);
+
+			if (use_material_slots) {
+				for (int i = 0; i < me->totcol; i++) {
+					Material *ma = give_current_material(ob, i + 1);
+					Image *ima = (ma && ma->texpaintslot) ? ma->texpaintslot[ma->paint_active_slot].ima : NULL;
+					GPUTexture *tex = ima ?
+					        GPU_texture_from_blender(ima, NULL, GL_TEXTURE_2D, false, false, false) : NULL;
+
+					if (tex) {
+						DRWShadingGroup *grp = DRW_shgroup_create(e_data.image_sh, psl->image_faces);
+						DRW_shgroup_uniform_texture(grp, "image", tex);
+						stl->g_data->shgroup_image_array[i] = grp;
+					}
+					else {
+						stl->g_data->shgroup_image_array[i] = NULL;
+					}
+				}
+			}
+			else {
+				Image *ima = scene->toolsettings->imapaint.canvas;
+				GPUTexture *tex = ima ?
+				        GPU_texture_from_blender(ima, NULL, GL_TEXTURE_2D, false, false, false) : NULL;
+
+				if (tex) {
+					DRWShadingGroup *grp = DRW_shgroup_create(e_data.image_sh, psl->image_faces);
+					DRW_shgroup_uniform_texture(grp, "image", tex);
+					stl->g_data->shgroup_image_array[0] = grp;
+				}
+				else {
+					stl->g_data->shgroup_image_array[0] = NULL;
+				}
+			}
+		}
+	}
+
+	/* Face Mask */
+	{
+		psl->wire_overlay = DRW_pass_create(
+		        "Wire Pass",
+		        DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS);
+
+		stl->g_data->lwire_shgrp = DRW_shgroup_create(e_data.wire_overlay_shader, psl->wire_overlay);
+	}
+
+	{
+		psl->face_overlay = DRW_pass_create(
+		        "Face Mask Pass",
+		        DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | DRW_STATE_BLEND);
+
+		stl->g_data->face_shgrp = DRW_shgroup_create(e_data.face_overlay_shader, psl->face_overlay);
+
+		static float col[4] = {1.0f, 1.0f, 1.0f, 0.2f};
+		DRW_shgroup_uniform_vec4(stl->g_data->face_shgrp, "color", col, 1);
+	}
+}
+
+/* Add geometry to shadingGroups. Execute for each objects */
+static void PAINT_TEXTURE_cache_populate(void *vedata, Object *ob)
+{
+	PAINT_TEXTURE_PassList *psl = ((PAINT_TEXTURE_Data *)vedata)->psl;
+	PAINT_TEXTURE_StorageList *stl = ((PAINT_TEXTURE_Data *)vedata)->stl;
+	const DRWContextState *draw_ctx = DRW_context_state_get();
+
+	UNUSED_VARS(psl, stl);
+
+	if ((ob->type == OB_MESH) && (draw_ctx->obact == ob)) {
+		/* Get geometry cache */
+		const Mesh *me = ob->data;
+		Scene *scene = draw_ctx->scene;
+		const bool use_surface = DRW_object_is_mode_shade(ob) == true;
+		const bool use_material_slots = (scene->toolsettings->imapaint.mode == IMAGEPAINT_MODE_MATERIAL);
+		bool ok = false;
+
+		if (use_surface) {
+			if (me->mloopuv != NULL) {
+				if (use_material_slots) {
+					struct Gwn_Batch **geom_array = me->totcol ? DRW_cache_mesh_surface_texpaint_get(ob) : NULL;
+					if ((me->totcol == 0) || (geom_array == NULL)) {
+						struct Gwn_Batch *geom = DRW_cache_mesh_surface_get(ob);
+						DRW_shgroup_call_add(stl->g_data->shgroup_fallback, geom, ob->obmat);
+						ok = true;
+					}
+					else {
+						for (int i = 0; i < me->totcol; i++) {
+							if (stl->g_data->shgroup_image_array[i]) {
+								DRW_shgroup_call_add(stl->g_data->shgroup_image_array[i], geom_array[i], ob->obmat);
+							}
+							else {
+								DRW_shgroup_call_add(stl->g_data->shgroup_fallback, geom_array[i], ob->obmat);
+							}
+							ok = true;
+						}
+					}
+				}
+				else {
+					struct Gwn_Batch *geom = DRW_cache_mesh_surface_texpaint_single_get(ob);
+					if (geom && stl->g_data->shgroup_image_array[0]) {
+						DRW_shgroup_call_add(stl->g_data->shgroup_image_array[0], geom, ob->obmat);
+						ok = true;
+					}
+				}
+			}
+
+			if (!ok) {
+				struct Gwn_Batch *geom = DRW_cache_mesh_surface_get(ob);
+				DRW_shgroup_call_add(stl->g_data->shgroup_fallback, geom, ob->obmat);
+			}
+		}
+
+		/* Face Mask */
+		const bool use_face_sel = (me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
+		if (use_face_sel) {
+			struct Gwn_Batch *geom;
+			/* Note: ideally selected faces wouldn't show interior wire. */
+			const bool use_wire = true;
+			geom = DRW_cache_mesh_edges_paint_overlay_get(ob, use_wire, use_face_sel);
+			DRW_shgroup_call_add(stl->g_data->lwire_shgrp, geom, ob->obmat);
+
+			geom = DRW_cache_mesh_faces_weight_overlay_get(ob);
+			DRW_shgroup_call_add(stl->g_data->face_shgrp, geom, ob->obmat);
+		}
+	}
+}
+
+/* Optional: Post-cache_populate callback */
+static void PAINT_TEXTURE_cache_finish(void *vedata)
+{
+	PAINT_TEXTURE_PassList *psl = ((PAINT_TEXTURE_Data *)vedata)->psl;
+	PAINT_TEXTURE_StorageList *stl = ((PAINT_TEXTURE_Data *)vedata)->stl;
+
+	/* Do something here! dependant on the objects gathered */
+	UNUSED_VARS(psl);
+
+	MEM_SAFE_FREE(stl->g_data->shgroup_image_array);
+}
+
+/* Draw time ! Control rendering pipeline from here */
+static void PAINT_TEXTURE_draw_scene(void *vedata)
+{
+	PAINT_TEXTURE_PassList *psl = ((PAINT_TEXTURE_Data *)vedata)->psl;
+	PAINT_TEXTURE_FramebufferList *fbl = ((PAINT_TEXTURE_Data *)vedata)->fbl;
+
+	/* Default framebuffer and texture */
+	DefaultFramebufferList *dfbl = DRW_viewport_framebuffer_list_get();
+	DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
+
+	UNUSED_VARS(fbl, dfbl, dtxl);
+
+	DRW_draw_pass(psl->image_faces);
+
+	DRW_draw_pass(psl->face_overlay);
+	DRW_draw_pass(psl->wire_overlay);
+}
+
+/* Cleanup when destroying the engine.
+ * This is not per viewport ! only when quitting blender.
+ * Mostly used for freeing shaders */
+static void PAINT_TEXTURE_engine_free(void)
+{
+	DRW_SHADER_FREE_SAFE(e_data.image_sh);
+	DRW_SHADER_FREE_SAFE(e_data.wire_overlay_shader);
+}
+
+/* Create collection settings here.
+ *
+ * Be sure to add this function there :
+ * source/blender/draw/DRW_engine.h
+ * source/blender/blenkernel/intern/layer.c
+ * source/blenderplayer/bad_level_call_stubs/stubs.c
+ *
+ * And relevant collection settings to :
+ * source/blender/makesrna/intern/rna_scene.c
+ * source/blender/blenkernel/intern/layer.c
+ */
+#if 0
+void PAINT_TEXTURE_collection_settings_create(CollectionEngineSettings *ces)
+{
+	BLI_assert(ces);
+	// BKE_collection_engine_property_add_int(ces, "my_bool_prop", false);
+	// BKE_collection_engine_property_add_int(ces, "my_int_prop", 0);
+	// BKE_collection_engine_property_add_float(ces, "my_float_prop", 0.0f);
+}
+#endif
+
+static const DrawEngineDataSize PAINT_TEXTURE_data_size = DRW_VIEWPORT_DATA_SIZE(PAINT_TEXTURE_Data);
+
+DrawEngineType draw_engine_paint_texture_type = {
+	NULL, NULL,
+	N_("PaintTextureMode"),
+	&PAINT_TEXTURE_data_size,
+	&PAINT_TEXTURE_engine_init,
+	&PAINT_TEXTURE_engine_free,
+	&PAINT_TEXTURE_cache_init,
+	&PAINT_TEXTURE_cache_populate,
+	&PAINT_TEXTURE_cache_finish,
+	NULL, /* draw_background but not needed by mode engines */
+	&PAINT_TEXTURE_draw_scene,
+	NULL,
+	NULL,
+};