Merge pull request #98294 from Calinou/texture-placeholders-use-shared-copy

Use a shared copy of placeholder textures, tweak placeholder appearance

2 files changed, 36 insertions, 32 deletions

diff --git a/drivers/gles3/storage/texture_storage.cpp b/drivers/gles3/storage/texture_storage.cpp
index d7b4d6911d..5f49a84fe8 100644
--- a/drivers/gles3/storage/texture_storage.cpp
+++ b/drivers/gles3/storage/texture_storage.cpp
@@ -230,6 +230,32 @@ TextureStorage::TextureStorage() {
 		sdf_shader.shader_version = sdf_shader.shader.version_create();
 	}
 
+	// Initialize texture placeholder data for the `texture_*_placeholder_initialize()` methods.
+
+	constexpr int placeholder_size = 4;
+	texture_2d_placeholder = Image::create_empty(placeholder_size, placeholder_size, false, Image::FORMAT_RGBA8);
+	// Draw a magenta/black checkerboard pattern.
+	for (int i = 0; i < placeholder_size * placeholder_size; i++) {
+		const int x = i % placeholder_size;
+		const int y = i / placeholder_size;
+		texture_2d_placeholder->set_pixel(x, y, (x + y) % 2 == 0 ? Color(1, 0, 1) : Color(0, 0, 0));
+	}
+
+	texture_2d_array_placeholder.push_back(texture_2d_placeholder);
+
+	for (int i = 0; i < 6; i++) {
+		cubemap_placeholder.push_back(texture_2d_placeholder);
+	}
+
+	Ref<Image> texture_2d_placeholder_rotated;
+	texture_2d_placeholder_rotated.instantiate();
+	texture_2d_placeholder_rotated->copy_from(texture_2d_placeholder);
+	texture_2d_placeholder_rotated->rotate_90(CLOCKWISE);
+	for (int i = 0; i < 4; i++) {
+		// Alternate checkerboard pattern on odd layers (by using a copy that is rotated 90 degrees).
+		texture_3d_placeholder.push_back(i % 2 == 0 ? texture_2d_placeholder : texture_2d_placeholder_rotated);
+	}
+
 #ifdef GL_API_ENABLED
 	if (RasterizerGLES3::is_gles_over_gl()) {
 		glEnable(GL_PROGRAM_POINT_SIZE);
@@ -1014,46 +1040,19 @@ void TextureStorage::texture_proxy_update(RID p_texture, RID p_proxy_to) {
 }
 
 void TextureStorage::texture_2d_placeholder_initialize(RID p_texture) {
-	//this could be better optimized to reuse an existing image , done this way
-	//for now to get it working
-	Ref<Image> image = Image::create_empty(4, 4, false, Image::FORMAT_RGBA8);
-	image->fill(Color(1, 0, 1, 1));
-
-	texture_2d_initialize(p_texture, image);
+	texture_2d_initialize(p_texture, texture_2d_placeholder);
 }
 
-void TextureStorage::texture_2d_layered_placeholder_initialize(RID p_texture, RenderingServer::TextureLayeredType p_layered_type) {
-	//this could be better optimized to reuse an existing image , done this way
-	//for now to get it working
-	Ref<Image> image = Image::create_empty(4, 4, false, Image::FORMAT_RGBA8);
-	image->fill(Color(1, 0, 1, 1));
-
-	Vector<Ref<Image>> images;
+void TextureStorage::texture_2d_layered_placeholder_initialize(RID p_texture, RS::TextureLayeredType p_layered_type) {
 	if (p_layered_type == RS::TEXTURE_LAYERED_2D_ARRAY) {
-		images.push_back(image);
+		texture_2d_layered_initialize(p_texture, texture_2d_array_placeholder, p_layered_type);
 	} else {
-		//cube
-		for (int i = 0; i < 6; i++) {
-			images.push_back(image);
-		}
+		texture_2d_layered_initialize(p_texture, cubemap_placeholder, p_layered_type);
 	}
-
-	texture_2d_layered_initialize(p_texture, images, p_layered_type);
 }
 
 void TextureStorage::texture_3d_placeholder_initialize(RID p_texture) {
-	//this could be better optimized to reuse an existing image , done this way
-	//for now to get it working
-	Ref<Image> image = Image::create_empty(4, 4, false, Image::FORMAT_RGBA8);
-	image->fill(Color(1, 0, 1, 1));
-
-	Vector<Ref<Image>> images;
-	//cube
-	for (int i = 0; i < 4; i++) {
-		images.push_back(image);
-	}
-
-	texture_3d_initialize(p_texture, Image::FORMAT_RGBA8, 4, 4, 4, false, images);
+	texture_3d_initialize(p_texture, Image::FORMAT_RGBA8, 4, 4, 4, false, texture_3d_placeholder);
 }
 
 Ref<Image> TextureStorage::texture_2d_get(RID p_texture) const {
diff --git a/drivers/gles3/storage/texture_storage.h b/drivers/gles3/storage/texture_storage.h
index 544e13f9bc..d85d10e235 100644
--- a/drivers/gles3/storage/texture_storage.h
+++ b/drivers/gles3/storage/texture_storage.h
@@ -522,6 +522,11 @@ public:
 	virtual void texture_external_update(RID p_texture, int p_width, int p_height, uint64_t p_external_buffer) override;
 	virtual void texture_proxy_update(RID p_proxy, RID p_base) override;
 
+	Ref<Image> texture_2d_placeholder;
+	Vector<Ref<Image>> texture_2d_array_placeholder;
+	Vector<Ref<Image>> cubemap_placeholder;
+	Vector<Ref<Image>> texture_3d_placeholder;
+
 	//these two APIs can be used together or in combination with the others.
 	virtual void texture_2d_placeholder_initialize(RID p_texture) override;
 	virtual void texture_2d_layered_placeholder_initialize(RID p_texture, RenderingServer::TextureLayeredType p_layered_type) override;