Add 2D shadows and canvas SDF to OpenGL3 renderer

This is an initial implementation based on the current RD implementation

Performance will improve later

5 files changed, 296 insertions, 98 deletions

diff --git a/drivers/gles3/storage/config.cpp b/drivers/gles3/storage/config.cpp
index 943df3b156..0e0c361add 100644
--- a/drivers/gles3/storage/config.cpp
+++ b/drivers/gles3/storage/config.cpp
@@ -71,7 +71,7 @@ Config::Config() {
 	s3tc_supported = true;
 	rgtc_supported = true; //RGTC - core since OpenGL version 3.0
 #else
-	float_texture_supported = extensions.has("GL_ARB_texture_float") || extensions.has("GL_OES_texture_float");
+	float_texture_supported = extensions.has("GL_EXT_color_buffer_float");
 	etc2_supported = true;
 #if defined(ANDROID_ENABLED) || defined(IOS_ENABLED)
 	// Some Android devices report support for S3TC but we don't expect that and don't export the textures.
@@ -84,24 +84,14 @@ Config::Config() {
 	rgtc_supported = extensions.has("GL_EXT_texture_compression_rgtc") || extensions.has("GL_ARB_texture_compression_rgtc") || extensions.has("EXT_texture_compression_rgtc");
 #endif
 
-#ifdef GLES_OVER_GL
-	use_rgba_2d_shadows = false;
-#else
-	use_rgba_2d_shadows = !(float_texture_supported && extensions.has("GL_EXT_texture_rg"));
-#endif
-
 	glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &max_vertex_texture_image_units);
 	glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_image_units);
 	glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
 	glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &max_uniform_buffer_size);
-	glGetIntegerv(GL_MAX_VIEWPORT_DIMS, &max_viewport_size);
+	glGetIntegerv(GL_MAX_VIEWPORT_DIMS, max_viewport_size);
 
 	glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &uniform_buffer_offset_alignment);
 
-	// the use skeleton software path should be used if either float texture is not supported,
-	// OR max_vertex_texture_image_units is zero
-	use_skeleton_software = (float_texture_supported == false) || (max_vertex_texture_image_units == 0);
-
 	support_anisotropic_filter = extensions.has("GL_EXT_texture_filter_anisotropic");
 	if (support_anisotropic_filter) {
 		glGetFloatv(_GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &anisotropic_level);
diff --git a/drivers/gles3/storage/config.h b/drivers/gles3/storage/config.h
index d4b38acd18..87202fde84 100644
--- a/drivers/gles3/storage/config.h
+++ b/drivers/gles3/storage/config.h
@@ -56,15 +56,13 @@ private:
 
 public:
 	bool use_nearest_mip_filter = false;
-	bool use_skeleton_software = false;
 	bool use_depth_prepass = true;
-	bool use_rgba_2d_shadows = false;
 
 	int max_vertex_texture_image_units = 0;
 	int max_texture_image_units = 0;
 	int max_texture_size = 0;
+	int max_viewport_size[2] = { 0, 0 };
 	int max_uniform_buffer_size = 0;
-	int max_viewport_size = 0;
 	int max_renderable_elements = 0;
 	int max_renderable_lights = 0;
 	int max_lights_per_object = 0;
diff --git a/drivers/gles3/storage/texture_storage.cpp b/drivers/gles3/storage/texture_storage.cpp
index 524ff14cc9..a7e5001271 100644
--- a/drivers/gles3/storage/texture_storage.cpp
+++ b/drivers/gles3/storage/texture_storage.cpp
@@ -207,6 +207,11 @@ TextureStorage::TextureStorage() {
 
 	glBindTexture(GL_TEXTURE_2D, 0);
 
+	{
+		sdf_shader.shader.initialize();
+		sdf_shader.shader_version = sdf_shader.shader.version_create();
+	}
+
 #ifdef GLES_OVER_GL
 	glEnable(GL_PROGRAM_POINT_SIZE);
 #endif
@@ -222,6 +227,7 @@ TextureStorage::~TextureStorage() {
 	texture_atlas.texture = 0;
 	glDeleteFramebuffers(1, &texture_atlas.framebuffer);
 	texture_atlas.framebuffer = 0;
+	sdf_shader.shader.version_free(sdf_shader.shader_version);
 }
 
 //TODO, move back to storage
@@ -276,55 +282,6 @@ void TextureStorage::canvas_texture_set_texture_repeat(RID p_canvas_texture, RS:
 	ct->texture_repeat = p_repeat;
 }
 
-/* CANVAS SHADOW */
-
-RID TextureStorage::canvas_light_shadow_buffer_create(int p_width) {
-	Config *config = Config::get_singleton();
-	CanvasLightShadow *cls = memnew(CanvasLightShadow);
-
-	if (p_width > config->max_texture_size) {
-		p_width = config->max_texture_size;
-	}
-
-	cls->size = p_width;
-	cls->height = 16;
-
-	glActiveTexture(GL_TEXTURE0);
-
-	glGenFramebuffers(1, &cls->fbo);
-	glBindFramebuffer(GL_FRAMEBUFFER, cls->fbo);
-
-	glGenRenderbuffers(1, &cls->depth);
-	glBindRenderbuffer(GL_RENDERBUFFER, cls->depth);
-	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, cls->size, cls->height);
-	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, cls->depth);
-
-	glGenTextures(1, &cls->distance);
-	glBindTexture(GL_TEXTURE_2D, cls->distance);
-	if (config->use_rgba_2d_shadows) {
-		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, cls->size, cls->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
-	} else {
-		glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, cls->size, cls->height, 0, GL_RED, GL_FLOAT, nullptr);
-	}
-
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, cls->distance, 0);
-
-	GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
-	//printf("errnum: %x\n",status);
-	glBindFramebuffer(GL_FRAMEBUFFER, GLES3::TextureStorage::system_fbo);
-
-	if (status != GL_FRAMEBUFFER_COMPLETE) {
-		memdelete(cls);
-		ERR_FAIL_COND_V(status != GL_FRAMEBUFFER_COMPLETE, RID());
-	}
-
-	return canvas_light_shadow_owner.make_rid(cls);
-}
-
 /* Texture API */
 
 Ref<Image> TextureStorage::_get_gl_image_and_format(const Ref<Image> &p_image, Image::Format p_format, Image::Format &r_real_format, GLenum &r_gl_format, GLenum &r_gl_internal_format, GLenum &r_gl_type, bool &r_compressed, bool p_force_decompress) const {
@@ -1599,6 +1556,7 @@ void TextureStorage::_clear_render_target(RenderTarget *rt) {
 		rt->backbuffer = 0;
 		rt->backbuffer_fbo = 0;
 	}
+	_render_target_clear_sdf(rt);
 }
 
 RID TextureStorage::render_target_create() {
@@ -1784,13 +1742,271 @@ void TextureStorage::render_target_do_clear_request(RID p_render_target) {
 }
 
 void TextureStorage::render_target_set_sdf_size_and_scale(RID p_render_target, RS::ViewportSDFOversize p_size, RS::ViewportSDFScale p_scale) {
+	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND(!rt);
+	if (rt->sdf_oversize == p_size && rt->sdf_scale == p_scale) {
+		return;
+	}
+
+	rt->sdf_oversize = p_size;
+	rt->sdf_scale = p_scale;
+
+	_render_target_clear_sdf(rt);
+}
+
+Rect2i TextureStorage::_render_target_get_sdf_rect(const RenderTarget *rt) const {
+	Size2i margin;
+	int scale;
+	switch (rt->sdf_oversize) {
+		case RS::VIEWPORT_SDF_OVERSIZE_100_PERCENT: {
+			scale = 100;
+		} break;
+		case RS::VIEWPORT_SDF_OVERSIZE_120_PERCENT: {
+			scale = 120;
+		} break;
+		case RS::VIEWPORT_SDF_OVERSIZE_150_PERCENT: {
+			scale = 150;
+		} break;
+		case RS::VIEWPORT_SDF_OVERSIZE_200_PERCENT: {
+			scale = 200;
+		} break;
+		default: {
+		}
+	}
+
+	margin = (rt->size * scale / 100) - rt->size;
+
+	Rect2i r(Vector2i(), rt->size);
+	r.position -= margin;
+	r.size += margin * 2;
+
+	return r;
 }
 
 Rect2i TextureStorage::render_target_get_sdf_rect(RID p_render_target) const {
-	return Rect2i();
+	const RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND_V(!rt, Rect2i());
+
+	return _render_target_get_sdf_rect(rt);
 }
 
 void TextureStorage::render_target_mark_sdf_enabled(RID p_render_target, bool p_enabled) {
+	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND(!rt);
+
+	rt->sdf_enabled = p_enabled;
+}
+
+bool TextureStorage::render_target_is_sdf_enabled(RID p_render_target) const {
+	const RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND_V(!rt, false);
+
+	return rt->sdf_enabled;
+}
+
+GLuint TextureStorage::render_target_get_sdf_texture(RID p_render_target) {
+	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND_V(!rt, 0);
+	if (rt->sdf_texture_read == 0) {
+		Texture *texture = texture_owner.get_or_null(default_gl_textures[DEFAULT_GL_TEXTURE_BLACK]);
+		return texture->tex_id;
+	}
+
+	return rt->sdf_texture_read;
+}
+
+void TextureStorage::_render_target_allocate_sdf(RenderTarget *rt) {
+	ERR_FAIL_COND(rt->sdf_texture_write_fb != 0);
+
+	Size2i size = _render_target_get_sdf_rect(rt).size;
+
+	glGenTextures(1, &rt->sdf_texture_write);
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_write);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, size.width, size.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	glGenFramebuffers(1, &rt->sdf_texture_write_fb);
+	glBindFramebuffer(GL_FRAMEBUFFER, rt->sdf_texture_write_fb);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->sdf_texture_write, 0);
+
+	int scale;
+	switch (rt->sdf_scale) {
+		case RS::VIEWPORT_SDF_SCALE_100_PERCENT: {
+			scale = 100;
+		} break;
+		case RS::VIEWPORT_SDF_SCALE_50_PERCENT: {
+			scale = 50;
+		} break;
+		case RS::VIEWPORT_SDF_SCALE_25_PERCENT: {
+			scale = 25;
+		} break;
+		default: {
+			scale = 100;
+		} break;
+	}
+
+	rt->process_size = size * scale / 100;
+	rt->process_size.x = MAX(rt->process_size.x, 1);
+	rt->process_size.y = MAX(rt->process_size.y, 1);
+
+	glGenTextures(2, rt->sdf_texture_process);
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_process[0]);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16I, rt->process_size.width, rt->process_size.height, 0, GL_RG_INTEGER, GL_SHORT, nullptr);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_process[1]);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16I, rt->process_size.width, rt->process_size.height, 0, GL_RG_INTEGER, GL_SHORT, nullptr);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	glGenTextures(1, &rt->sdf_texture_read);
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_read);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, rt->process_size.width, rt->process_size.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+}
+
+void TextureStorage::_render_target_clear_sdf(RenderTarget *rt) {
+	if (rt->sdf_texture_write_fb != 0) {
+		glDeleteTextures(1, &rt->sdf_texture_read);
+		glDeleteTextures(1, &rt->sdf_texture_write);
+		glDeleteTextures(2, rt->sdf_texture_process);
+		glDeleteFramebuffers(1, &rt->sdf_texture_write_fb);
+		rt->sdf_texture_read = 0;
+		rt->sdf_texture_write = 0;
+		rt->sdf_texture_process[0] = 0;
+		rt->sdf_texture_process[1] = 0;
+		rt->sdf_texture_write_fb = 0;
+	}
+}
+
+GLuint TextureStorage::render_target_get_sdf_framebuffer(RID p_render_target) {
+	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND_V(!rt, 0);
+
+	if (rt->sdf_texture_write_fb == 0) {
+		_render_target_allocate_sdf(rt);
+	}
+
+	return rt->sdf_texture_write_fb;
+}
+void TextureStorage::render_target_sdf_process(RID p_render_target) {
+	CopyEffects *copy_effects = CopyEffects::get_singleton();
+
+	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
+	ERR_FAIL_COND(!rt);
+	ERR_FAIL_COND(rt->sdf_texture_write_fb == 0);
+
+	Rect2i r = _render_target_get_sdf_rect(rt);
+
+	Size2i size = r.size;
+	int32_t shift = 0;
+
+	bool shrink = false;
+
+	switch (rt->sdf_scale) {
+		case RS::VIEWPORT_SDF_SCALE_50_PERCENT: {
+			size[0] >>= 1;
+			size[1] >>= 1;
+			shift = 1;
+			shrink = true;
+		} break;
+		case RS::VIEWPORT_SDF_SCALE_25_PERCENT: {
+			size[0] >>= 2;
+			size[1] >>= 2;
+			shift = 2;
+			shrink = true;
+		} break;
+		default: {
+		};
+	}
+
+	GLuint temp_fb;
+	glGenFramebuffers(1, &temp_fb);
+	glBindFramebuffer(GL_FRAMEBUFFER, temp_fb);
+
+	// Load
+	CanvasSdfShaderGLES3::ShaderVariant variant = shrink ? CanvasSdfShaderGLES3::MODE_LOAD_SHRINK : CanvasSdfShaderGLES3::MODE_LOAD;
+	sdf_shader.shader.version_bind_shader(sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::BASE_SIZE, r.size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SIZE, size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::STRIDE, 0, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SHIFT, shift, sdf_shader.shader_version, variant);
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_write);
+
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->sdf_texture_process[0], 0);
+	glViewport(0, 0, size.width, size.height);
+	glEnable(GL_SCISSOR_TEST);
+	glScissor(0, 0, size.width, size.height);
+
+	copy_effects->draw_screen_triangle();
+
+	// Process
+
+	int stride = nearest_power_of_2_templated(MAX(size.width, size.height) / 2);
+
+	variant = CanvasSdfShaderGLES3::MODE_PROCESS;
+	sdf_shader.shader.version_bind_shader(sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::BASE_SIZE, r.size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SIZE, size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::STRIDE, stride, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SHIFT, shift, sdf_shader.shader_version, variant);
+
+	bool swap = false;
+
+	//jumpflood
+	while (stride > 0) {
+		glBindTexture(GL_TEXTURE_2D, 0);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->sdf_texture_process[swap ? 0 : 1], 0);
+		glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_process[swap ? 1 : 0]);
+
+		sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::STRIDE, stride, sdf_shader.shader_version, variant);
+
+		copy_effects->draw_screen_triangle();
+
+		stride /= 2;
+		swap = !swap;
+	}
+
+	// Store
+	variant = shrink ? CanvasSdfShaderGLES3::MODE_STORE_SHRINK : CanvasSdfShaderGLES3::MODE_STORE;
+	sdf_shader.shader.version_bind_shader(sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::BASE_SIZE, r.size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SIZE, size, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::STRIDE, stride, sdf_shader.shader_version, variant);
+	sdf_shader.shader.version_set_uniform(CanvasSdfShaderGLES3::SHIFT, shift, sdf_shader.shader_version, variant);
+
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->sdf_texture_read, 0);
+	glBindTexture(GL_TEXTURE_2D, rt->sdf_texture_process[swap ? 1 : 0]);
+
+	copy_effects->draw_screen_triangle();
+
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, system_fbo);
+	glDeleteFramebuffers(1, &temp_fb);
+	glDisable(GL_SCISSOR_TEST);
 }
 
 void TextureStorage::render_target_copy_to_back_buffer(RID p_render_target, const Rect2i &p_region, bool p_gen_mipmaps) {
diff --git a/drivers/gles3/storage/texture_storage.h b/drivers/gles3/storage/texture_storage.h
index dbe39428ac..0b025c4370 100644
--- a/drivers/gles3/storage/texture_storage.h
+++ b/drivers/gles3/storage/texture_storage.h
@@ -39,6 +39,8 @@
 #include "servers/rendering/renderer_compositor.h"
 #include "servers/rendering/storage/texture_storage.h"
 
+#include "../shaders/canvas_sdf.glsl.gen.h"
+
 // This must come first to avoid windows.h mess
 #include "platform_config.h"
 #ifndef OPENGL_INCLUDE_H
@@ -84,18 +86,8 @@ namespace GLES3 {
 
 #define _GL_TEXTURE_EXTERNAL_OES 0x8D65
 
-#ifdef GLES_OVER_GL
-#define _GL_HALF_FLOAT_OES 0x140B
-#else
-#define _GL_HALF_FLOAT_OES 0x8D61
-#endif
-
 #define _EXT_TEXTURE_CUBE_MAP_SEAMLESS 0x884F
 
-#define _RED_OES 0x1903
-
-#define _DEPTH_COMPONENT24_OES 0x81A6
-
 #ifndef GLES_OVER_GL
 #define glClearDepth glClearDepthf
 #endif //!GLES_OVER_GL
@@ -128,17 +120,6 @@ struct CanvasTexture {
 	RS::CanvasItemTextureRepeat texture_repeat = RS::CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT;
 };
 
-/* CANVAS SHADOW */
-
-struct CanvasLightShadow {
-	RID self;
-	int size;
-	int height;
-	GLuint fbo;
-	GLuint depth;
-	GLuint distance; //for older devices
-};
-
 struct RenderTarget;
 
 struct Texture {
@@ -337,6 +318,15 @@ struct RenderTarget {
 	GLuint color_type = GL_UNSIGNED_BYTE;
 	Image::Format image_format = Image::FORMAT_RGBA8;
 
+	GLuint sdf_texture_write = 0;
+	GLuint sdf_texture_write_fb = 0;
+	GLuint sdf_texture_process[2] = { 0, 0 };
+	GLuint sdf_texture_read = 0;
+	RS::ViewportSDFOversize sdf_oversize = RS::VIEWPORT_SDF_OVERSIZE_120_PERCENT;
+	RS::ViewportSDFScale sdf_scale = RS::VIEWPORT_SDF_SCALE_50_PERCENT;
+	Size2i process_size;
+	bool sdf_enabled = false;
+
 	bool is_transparent = false;
 	bool direct_to_screen = false;
 
@@ -362,10 +352,6 @@ private:
 
 	RID_Owner<CanvasTexture, true> canvas_texture_owner;
 
-	/* CANVAS SHADOW */
-
-	RID_PtrOwner<CanvasLightShadow> canvas_light_shadow_owner;
-
 	/* Texture API */
 
 	mutable RID_Owner<Texture> texture_owner;
@@ -411,6 +397,14 @@ private:
 	void _clear_render_target(RenderTarget *rt);
 	void _update_render_target(RenderTarget *rt);
 	void _create_render_target_backbuffer(RenderTarget *rt);
+	void _render_target_allocate_sdf(RenderTarget *rt);
+	void _render_target_clear_sdf(RenderTarget *rt);
+	Rect2i _render_target_get_sdf_rect(const RenderTarget *rt) const;
+
+	struct RenderTargetSDF {
+		CanvasSdfShaderGLES3 shader;
+		RID shader_version;
+	} sdf_shader;
 
 public:
 	static TextureStorage *get_singleton();
@@ -437,10 +431,6 @@ public:
 	virtual void canvas_texture_set_texture_filter(RID p_item, RS::CanvasItemTextureFilter p_filter) override;
 	virtual void canvas_texture_set_texture_repeat(RID p_item, RS::CanvasItemTextureRepeat p_repeat) override;
 
-	/* CANVAS SHADOW */
-
-	RID canvas_light_shadow_buffer_create(int p_width);
-
 	/* Texture API */
 
 	Texture *get_texture(RID p_rid) {
@@ -586,9 +576,13 @@ public:
 	void render_target_disable_clear_request(RID p_render_target) override;
 	void render_target_do_clear_request(RID p_render_target) override;
 
-	void render_target_set_sdf_size_and_scale(RID p_render_target, RS::ViewportSDFOversize p_size, RS::ViewportSDFScale p_scale) override;
-	Rect2i render_target_get_sdf_rect(RID p_render_target) const override;
-	void render_target_mark_sdf_enabled(RID p_render_target, bool p_enabled) override;
+	virtual void render_target_set_sdf_size_and_scale(RID p_render_target, RS::ViewportSDFOversize p_size, RS::ViewportSDFScale p_scale) override;
+	virtual Rect2i render_target_get_sdf_rect(RID p_render_target) const override;
+	GLuint render_target_get_sdf_texture(RID p_render_target);
+	GLuint render_target_get_sdf_framebuffer(RID p_render_target);
+	void render_target_sdf_process(RID p_render_target);
+	virtual void render_target_mark_sdf_enabled(RID p_render_target, bool p_enabled) override;
+	bool render_target_is_sdf_enabled(RID p_render_target) const;
 
 	void render_target_copy_to_back_buffer(RID p_render_target, const Rect2i &p_region, bool p_gen_mipmaps);
 	void render_target_clear_back_buffer(RID p_render_target, const Rect2i &p_region, const Color &p_color);
diff --git a/drivers/gles3/storage/utilities.cpp b/drivers/gles3/storage/utilities.cpp
index 0a04f0d4d0..58469c932d 100644
--- a/drivers/gles3/storage/utilities.cpp
+++ b/drivers/gles3/storage/utilities.cpp
@@ -362,7 +362,7 @@ Size2i Utilities::get_maximum_viewport_size() const {
 		return Size2i();
 	}
 
-	return Size2i(config->max_viewport_size, config->max_viewport_size);
+	return Size2i(config->max_viewport_size[0], config->max_viewport_size[1]);
 }
 
 #endif // GLES3_ENABLED