Add initial prototype.
This commit is contained in:
Rod Kay
185
3-mid/opengl/source/lean/geometry/opengl-geometry-textured.adb
Normal file
185
3-mid/opengl/source/lean/geometry/opengl-geometry-textured.adb
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@@ -0,0 +1,185 @@
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with
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openGL.Buffer.general,
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openGL.Shader,
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openGL.Program,
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openGL.Palette,
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openGL.Attribute,
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openGL.Texture,
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openGL.Tasks,
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openGL.Errors,
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GL.Binding,
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GL.lean,
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GL.Pointers,
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System,
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Interfaces.C.Strings,
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System.storage_Elements;
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package body openGL.Geometry.textured
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is
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use GL.lean,
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GL.Pointers,
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Interfaces,
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System;
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-----------
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-- Globals
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--
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vertex_Shader : aliased Shader.item;
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fragment_Shader : aliased Shader.item;
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the_Program : openGL.Program.view;
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white_Texture : openGL.Texture.Object;
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Name_1 : constant String := "Site";
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Name_2 : constant String := "Coords";
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Attribute_1_Name : aliased C.char_array := C.to_C (Name_1);
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Attribute_2_Name : aliased C.char_array := C.to_C (Name_2);
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Attribute_1_Name_ptr : aliased constant C.strings.chars_ptr := C.strings.to_chars_ptr (Attribute_1_Name'Access);
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Attribute_2_Name_ptr : aliased constant C.strings.chars_ptr := C.strings.to_chars_ptr (Attribute_2_Name'Access);
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---------
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-- Forge
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--
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function new_Geometry return View
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is
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use type openGL.Program.view;
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Self : constant View := new Geometry.textured.item;
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begin
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Tasks.check;
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if the_Program = null
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then -- Define the shaders and program.
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declare
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use Palette,
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Attribute.Forge,
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system.Storage_Elements;
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Sample : Vertex;
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Attribute_1 : Attribute.view;
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Attribute_2 : Attribute.view;
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white_Image : constant openGL.Image := [1 .. 2 => [1 .. 2 => +White]];
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begin
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white_Texture := openGL.Texture.Forge.to_Texture (white_Image);
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vertex_Shader .define (openGL.Shader.vertex, "assets/opengl/shader/textured.vert");
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fragment_Shader.define (openGL.Shader.fragment, "assets/opengl/shader/textured.frag");
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the_Program := new openGL.Program.item;
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the_Program.define ( vertex_Shader'Access,
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fragment_Shader'Access);
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the_Program.enable;
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Attribute_1 := new_Attribute (Name => Name_1,
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gl_Location => the_Program.attribute_Location (Name_1),
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Size => 3,
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data_Kind => Attribute.GL_FLOAT,
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Stride => textured.Vertex'Size / 8,
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Offset => 0,
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Normalized => False);
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Attribute_2 := new_Attribute (Name => Name_2,
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gl_Location => the_Program.attribute_Location (Name_2),
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Size => 2,
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data_Kind => attribute.GL_FLOAT,
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Stride => textured.Vertex'Size / 8,
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Offset => Sample.Coords.S'Address
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- Sample.Site (1)'Address,
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Normalized => False);
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the_Program.add (Attribute_1);
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the_Program.add (Attribute_2);
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glBindAttribLocation (program => the_Program.gl_Program,
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index => the_Program.Attribute (named => Name_1).gl_Location,
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name => +Attribute_1_Name_ptr);
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glBindAttribLocation (program => the_Program.gl_Program,
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index => the_Program.Attribute (named => Name_2).gl_Location,
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name => +Attribute_2_Name_ptr);
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end;
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end if;
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Self.Program_is (the_Program.all'Access);
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return Self;
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end new_Geometry;
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--------------
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-- Attributes
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--
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overriding
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function is_Transparent (Self : in Item) return Boolean
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is
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begin
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return Self.is_Transparent;
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end is_Transparent;
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package openGL_Buffer_of_geometry_Vertices is new Buffer.general (base_Object => Buffer.array_Object,
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Index => Index_t,
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Element => Vertex,
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Element_Array => Vertex_array);
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procedure Vertices_are (Self : in out Item; Now : in Vertex_array)
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is
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use openGL_Buffer_of_geometry_Vertices.Forge;
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begin
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Self.Vertices := new openGL_Buffer_of_geometry_Vertices.Object' (to_Buffer (Now,
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usage => Buffer.static_Draw));
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-- Set the bounds.
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--
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declare
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function get_Site (Index : in Index_t) return Vector_3
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is (Now (Index).Site);
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function bounding_Box is new get_Bounds (Index_t, get_Site);
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begin
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Self.Bounds_are (bounding_Box (Count => Now'Length));
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end;
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end Vertices_are;
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overriding
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procedure Indices_are (Self : in out Item; Now : in Indices;
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for_Facia : in Positive)
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is
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begin
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raise Error with "opengl gemoetry textured - 'Indices_are' ~ TODO";
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end Indices_are;
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overriding
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procedure enable_Texture (Self : in Item)
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is
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use GL,
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GL.Binding,
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openGL.Texture;
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begin
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Tasks.check;
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glActiveTexture (gl.GL_TEXTURE0);
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Errors.log;
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if Self.Texture = openGL.Texture.null_Object
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then white_Texture.enable;
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else Self.Texture .enable;
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end if;
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end enable_Texture;
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end openGL.Geometry.textured;
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