Rename GLES2 driver to OpenGL to prepare for the upgrade to GLES3

- Use lowercase driver names for the `--rendering-driver`
  command line argument.

1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/opengl/rasterizer_canvas_base_opengl.h b/drivers/opengl/rasterizer_canvas_base_opengl.h
new file mode 100644
index 0000000000..ac2020e5d7
--- /dev/null
+++ b/drivers/opengl/rasterizer_canvas_base_opengl.h
@@ -0,0 +1,196 @@
+/*************************************************************************/
+/*  rasterizer_canvas_base_opengl.h                                      */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef RASTERIZER_CANVAS_BASE_OPENGL_H
+#define RASTERIZER_CANVAS_BASE_OPENGL_H
+
+#include "drivers/opengl/rasterizer_platforms.h"
+#ifdef OPENGL_BACKEND_ENABLED
+
+#include "drivers/opengl/rasterizer_array.h"
+#include "drivers/opengl/rasterizer_storage_common.h"
+#include "rasterizer_scene_opengl.h"
+#include "rasterizer_storage_opengl.h"
+#include "servers/rendering/renderer_canvas_render.h"
+#include "servers/rendering/renderer_compositor.h"
+
+#include "shaders/canvas.glsl.gen.h"
+#include "shaders/canvas_shadow.glsl.gen.h"
+#include "shaders/lens_distorted.glsl.gen.h"
+
+class RasterizerCanvasBaseOpenGL : public RendererCanvasRender {
+public:
+	enum {
+		INSTANCE_ATTRIB_BASE = 8,
+	};
+
+	struct Uniforms {
+		Transform3D projection_matrix;
+
+		Transform2D modelview_matrix;
+		Transform2D extra_matrix;
+
+		Color final_modulate;
+
+		float time;
+	};
+
+	struct Data {
+		GLuint canvas_quad_vertices;
+		GLuint polygon_buffer;
+		GLuint polygon_index_buffer;
+
+		uint32_t polygon_buffer_size;
+		uint32_t polygon_index_buffer_size;
+
+		GLuint ninepatch_vertices;
+		GLuint ninepatch_elements;
+	} data;
+
+	struct State {
+		Uniforms uniforms;
+		bool canvas_texscreen_used;
+		CanvasShaderOpenGL canvas_shader;
+		CanvasShadowShaderOpenGL canvas_shadow_shader;
+		LensDistortedShaderOpenGL lens_shader;
+
+		bool using_texture_rect;
+
+		bool using_light_angle;
+		bool using_modulate;
+		bool using_large_vertex;
+
+		bool using_ninepatch;
+		bool using_skeleton;
+
+		Transform2D skeleton_transform;
+		Transform2D skeleton_transform_inverse;
+		Size2i skeleton_texture_size;
+
+		RID current_tex;
+		RID current_normal;
+		RasterizerStorageOpenGL::Texture *current_tex_ptr;
+
+		Transform3D vp;
+		Light *using_light;
+		bool using_shadow;
+		bool using_transparent_rt;
+
+		// new for Godot 4.0
+		// min mag filter is per item, and repeat
+		RS::CanvasItemTextureFilter current_filter = RS::CANVAS_ITEM_TEXTURE_FILTER_LINEAR;
+		RS::CanvasItemTextureRepeat current_repeat = RS::CANVAS_ITEM_TEXTURE_REPEAT_DISABLED;
+	} state;
+
+	typedef void Texture;
+
+	RasterizerSceneOpenGL *scene_render;
+
+	RasterizerStorageOpenGL *storage;
+
+	// allow user to choose api usage
+	GLenum _buffer_upload_usage_flag;
+
+	void _set_uniforms();
+
+	virtual RID light_internal_create();
+	virtual void light_internal_update(RID p_rid, Light *p_light);
+	virtual void light_internal_free(RID p_rid);
+
+	virtual void canvas_begin();
+	virtual void canvas_end();
+
+protected:
+	void _legacy_draw_primitive(Item::CommandPrimitive *p_pr, RasterizerStorageOpenGL::Material *p_material);
+	void _legacy_draw_line(Item::CommandPrimitive *p_pr, RasterizerStorageOpenGL::Material *p_material);
+	void _legacy_draw_poly_triangles(Item::CommandPolygon *p_poly, RasterizerStorageOpenGL::Material *p_material);
+
+public:
+	void _draw_gui_primitive(int p_points, const Vector2 *p_vertices, const Color *p_colors, const Vector2 *p_uvs, const float *p_light_angles = nullptr);
+	void _draw_polygon(const int *p_indices, int p_index_count, int p_vertex_count, const Vector2 *p_vertices, const Vector2 *p_uvs, const Color *p_colors, bool p_singlecolor, const float *p_weights = NULL, const int *p_bones = NULL);
+	void _draw_generic(GLuint p_primitive, int p_vertex_count, const Vector2 *p_vertices, const Vector2 *p_uvs, const Color *p_colors, bool p_singlecolor);
+	void _draw_generic_indices(GLuint p_primitive, const int *p_indices, int p_index_count, int p_vertex_count, const Vector2 *p_vertices, const Vector2 *p_uvs, const Color *p_colors, bool p_singlecolor);
+
+	void _bind_quad_buffer();
+	void _copy_texscreen(const Rect2 &p_rect);
+	void _copy_screen(const Rect2 &p_rect);
+
+	//virtual void draw_window_margins(int *black_margin, RID *black_image) override;
+	void draw_generic_textured_rect(const Rect2 &p_rect, const Rect2 &p_src);
+	void draw_lens_distortion_rect(const Rect2 &p_rect, float p_k1, float p_k2, const Vector2 &p_eye_center, float p_oversample);
+
+	virtual void reset_canvas();
+	virtual void canvas_light_shadow_buffer_update(RID p_buffer, const Transform2D &p_light_xform, int p_light_mask, float p_near, float p_far, LightOccluderInstance *p_occluders, CameraMatrix *p_xform_cache);
+
+	// Copied from RasterizerCanvasDummy:
+	virtual void canvas_debug_viewport_shadows(Light *p_lights_with_shadow) override;
+
+	RID light_create() override;
+	void light_set_texture(RID p_rid, RID p_texture) override;
+	void light_set_use_shadow(RID p_rid, bool p_enable) override;
+	void light_update_shadow(RID p_rid, int p_shadow_index, const Transform2D &p_light_xform, int p_light_mask, float p_near, float p_far, LightOccluderInstance *p_occluders) override;
+	void light_update_directional_shadow(RID p_rid, int p_shadow_index, const Transform2D &p_light_xform, int p_light_mask, float p_cull_distance, const Rect2 &p_clip_rect, LightOccluderInstance *p_occluders) override;
+
+	void render_sdf(RID p_render_target, LightOccluderInstance *p_occluders) override;
+	RID occluder_polygon_create() override;
+	void occluder_polygon_set_shape(RID p_occluder, const Vector<Vector2> &p_points, bool p_closed) override;
+	void occluder_polygon_set_cull_mode(RID p_occluder, RS::CanvasOccluderPolygonCullMode p_mode) override;
+	void set_shadow_texture_size(int p_size) override;
+
+	bool free(RID p_rid) override;
+	void update() override;
+	// End copied from RasterizerCanvasDummy.
+
+	RasterizerStorageOpenGL::Texture *_bind_canvas_texture(const RID &p_texture, const RID &p_normal_map);
+	void _set_texture_rect_mode(bool p_texture_rect, bool p_light_angle = false, bool p_modulate = false, bool p_large_vertex = false);
+
+	// NEW API
+	struct PolyData {
+		LocalVector<int> indices;
+		LocalVector<Point2> points;
+		LocalVector<Color> colors;
+		LocalVector<Point2> uvs;
+	};
+
+	RendererCanvasRender::PolygonID request_polygon(const Vector<int> &p_indices, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs = Vector<Point2>(), const Vector<int> &p_bones = Vector<int>(), const Vector<float> &p_weights = Vector<float>()) override;
+	void free_polygon(PolygonID p_polygon) override;
+
+	RasterizerPooledIndirectList<PolyData> _polydata;
+
+	//////////////////////
+	void initialize();
+	void finalize();
+
+	RasterizerCanvasBaseOpenGL();
+};
+
+#endif // OPENGL_BACKEND_ENABLED
+
+#endif // RASTERIZER_CANVAS_BASE_OPENGL_H