DwM: texture paint support & mask mode

Uses workaround so material slots are used when neither blender-internal
or cycles are enabled.

3 files changed, 201 insertions, 29 deletions

diff --git a/source/blender/draw/modes/paint_texture_mode.c b/source/blender/draw/modes/paint_texture_mode.c
index d2316534cfe..b8ee9dd1e83 100644
--- a/source/blender/draw/modes/paint_texture_mode.c
+++ b/source/blender/draw/modes/paint_texture_mode.c
@@ -26,13 +26,24 @@
 #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. */
@@ -50,7 +61,10 @@ typedef struct PAINT_TEXTURE_PassList {
 	/* Declare all passes here and init them in
 	 * PAINT_TEXTURE_cache_init().
 	 * Only contains (DRWPass *) */
-	struct DRWPass *pass;
+	struct DRWPass *image_faces;
+
+	struct DRWPass *wire_overlay;
+	struct DRWPass *face_overlay;
 } PAINT_TEXTURE_PassList;
 
 typedef struct PAINT_TEXTURE_FramebufferList {
@@ -93,13 +107,22 @@ static struct {
 	 * Add sources to source/blender/draw/modes/shaders
 	 * init in PAINT_TEXTURE_engine_init();
 	 * free in PAINT_TEXTURE_engine_free(); */
-	struct GPUShader *custom_shader;
+	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 *group;
+	DRWShadingGroup *shgroup_fallback;
+	DRWShadingGroup **shgroup_image_array;
+
+	/* face-mask  */
+	DRWShadingGroup *lwire_shgrp;
+	DRWShadingGroup *face_shgrp;
 } PAINT_TEXTURE_PrivateData; /* Transient data */
 
 /* *********** FUNCTIONS *********** */
@@ -130,11 +153,33 @@ static void PAINT_TEXTURE_engine_init(void *vedata)
 	 *                     tex, 2);
 	 */
 
-	if (!e_data.custom_shader) {
-		e_data.custom_shader = GPU_shader_get_builtin_shader(GPU_SHADER_3D_UNIFORM_COLOR);
+	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);
+	}
+}
+#include "BKE_global.h"
+#include "BKE_main.h"
 /* Here init all passes and shading groups
  * Assume that all Passes are NULL */
 static void PAINT_TEXTURE_cache_init(void *vedata)
@@ -145,12 +190,14 @@ static void PAINT_TEXTURE_cache_init(void *vedata)
 	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->pass = DRW_pass_create("My Pass", state);
+		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);
 
 		/* Create a shadingGroup using a function in draw_common.c or custom one */
 		/*
@@ -158,14 +205,78 @@ static void PAINT_TEXTURE_cache_init(void *vedata)
 		 * -- or --
 		 * stl->g_data->group = DRW_shgroup_create(e_data.custom_shader, psl->pass);
 		 */
-		stl->g_data->group = DRW_shgroup_create(e_data.custom_shader, psl->pass);
+		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] = {0.2f, 0.5f, 0.3f, 1.0};
-		DRW_shgroup_uniform_vec4(stl->g_data->group, "color", color, 1);
+		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;
+			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 */
@@ -178,10 +289,53 @@ static void PAINT_TEXTURE_cache_populate(void *vedata, Object *ob)
 
 	if (ob->type == OB_MESH) {
 		/* Get geometry cache */
-		struct Batch *geom = DRW_cache_mesh_surface_get(ob);
-
-		/* Add geom to a shading group */
-		DRW_shgroup_call_add(stl->g_data->group, geom, ob->obmat);
+		const Mesh *me = ob->data;
+		const DRWContextState *draw_ctx = DRW_context_state_get();
+		Scene *scene = draw_ctx->scene;
+		bool use_material_slots = (scene->toolsettings->imapaint.mode == IMAGEPAINT_MODE_MATERIAL);
+
+		if (use_material_slots) {
+			struct Batch **geom_array = me->totcol ? DRW_cache_mesh_surface_texpaint_get(ob) : NULL;
+			if ((me->totcol == 0) || (geom_array == NULL)) {
+				struct Batch *geom = DRW_cache_mesh_surface_get(ob);
+				DRW_shgroup_call_add(stl->g_data->shgroup_fallback, geom, ob->obmat);
+			}
+			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);
+					}
+				}
+			}
+		}
+		else {
+			struct 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);
+			}
+			else {
+				if (geom == NULL) {
+					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 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);
+		}
 	}
 }
 
@@ -192,7 +346,9 @@ static void PAINT_TEXTURE_cache_finish(void *vedata)
 	PAINT_TEXTURE_StorageList *stl = ((PAINT_TEXTURE_Data *)vedata)->stl;
 
 	/* Do something here! dependant on the objects gathered */
-	UNUSED_VARS(psl, stl);
+	UNUSED_VARS(psl);
+
+	MEM_SAFE_FREE(stl->g_data->shgroup_image_array);
 }
 
 /* Draw time ! Control rendering pipeline from here */
@@ -207,20 +363,10 @@ static void PAINT_TEXTURE_draw_scene(void *vedata)
 
 	UNUSED_VARS(fbl, dfbl, dtxl);
 
-	/* Show / hide entire passes, swap framebuffers ... whatever you fancy */
-	/*
-	 * DRW_framebuffer_texture_detach(dtxl->depth);
-	 * DRW_framebuffer_bind(fbl->custom_fb);
-	 * DRW_draw_pass(psl->pass);
-	 * DRW_framebuffer_texture_attach(dfbl->default_fb, dtxl->depth, 0, 0);
-	 * DRW_framebuffer_bind(dfbl->default_fb);
-	 */
-
-	/* ... or just render passes on default framebuffer. */
-	DRW_draw_pass(psl->pass);
+	DRW_draw_pass(psl->image_faces);
 
-	/* If you changed framebuffer, double check you rebind
-	 * the default one with its textures attached before finishing */
+	DRW_draw_pass(psl->face_overlay);
+	DRW_draw_pass(psl->wire_overlay);
 }
 
 /* Cleanup when destroying the engine.
diff --git a/source/blender/draw/modes/shaders/paint_texture_frag.glsl b/source/blender/draw/modes/shaders/paint_texture_frag.glsl
new file mode 100644
index 00000000000..18c58a54dca
--- /dev/null
+++ b/source/blender/draw/modes/shaders/paint_texture_frag.glsl
@@ -0,0 +1,11 @@
+
+in vec2 uv_interp;
+out vec4 fragColor;
+
+uniform sampler2D image;
+
+
+void main()
+{
+	fragColor = texture(image, uv_interp);
+}
diff --git a/source/blender/draw/modes/shaders/paint_texture_vert.glsl b/source/blender/draw/modes/shaders/paint_texture_vert.glsl
new file mode 100644
index 00000000000..4ce12e048fa
--- /dev/null
+++ b/source/blender/draw/modes/shaders/paint_texture_vert.glsl
@@ -0,0 +1,15 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+
+in vec2 uv;
+in vec3 pos;
+
+out vec2 uv_interp;
+
+void main()
+{
+	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+
+	uv_interp = uv;
+
+}