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345 | with
openGL.Tasks,
GL.Pointers,
GL.lean,
ada.Characters.latin_1,
interfaces.C.Strings;
package body openGL.Program
is
use gl.lean,
Interfaces;
compiling_in_debug_Mode : constant Boolean := True;
type Shader_view is access all Shader.item'Class;
--------------
-- Parameters
--
procedure Program_is (Self : in out Parameters; Now : in openGL.Program.view)
is
begin
Self.Program := Now;
end Program_is;
function Program (Self : in Parameters) return openGL.Program.view
is
begin
return Self.Program;
end Program;
---------
--- Forge
--
procedure define (Self : in out Item; use_vertex_Shader : in Shader.view;
use_fragment_Shader : in Shader.view)
is
begin
Tasks.check;
Self.gl_Program := glCreateProgram;
glAttachShader (Self.gl_Program, use_vertex_Shader.gl_Shader);
glAttachShader (Self.gl_Program, use_fragment_Shader.gl_Shader);
Self. vertex_Shader := use_vertex_Shader;
Self.fragment_Shader := use_fragment_Shader;
glLinkProgram (Self.gl_Program);
declare
use type C.int;
Status : aliased gl.glInt;
begin
glGetProgramiv (Self.gl_Program,
GL_LINK_STATUS,
Status'unchecked_Access);
if Status = 0
then
declare
link_Log : constant String := Self.ProgramInfoLog;
begin
Self.destroy;
raise Error with "Program link error ~ " & link_Log;
end;
end if;
end;
if compiling_in_debug_Mode
then
glValidateProgram (Self.gl_Program);
end if;
end define;
procedure define (Self : in out Item; use_vertex_Shader_File : in String;
use_fragment_Shader_File : in String)
is
use openGL.Shader;
the_vertex_Shader : constant Shader_view := new openGL.Shader.item;
the_fragment_Shader : constant Shader_view := new openGL.Shader.item;
begin
the_vertex_Shader .define (openGL.Shader.vertex, use_vertex_Shader_File);
the_fragment_Shader.define (openGL.Shader.fragment, use_fragment_Shader_File);
Self.define ( the_vertex_Shader.all'Access,
the_fragment_Shader.all'Access);
end define;
procedure destroy (Self : in out Item)
is
begin
Tasks.check;
glDeleteProgram (Self.gl_Program);
end destroy;
--------------
-- Attributes
--
function Attribute (Self : access Item'Class; Named : in String) return openGL.Attribute.view
is
begin
for Each in 1 .. Self.attribute_Count
loop
if Self.Attributes (Each).Name = Named
then
return Self.Attributes (Each);
end if;
end loop;
raise Error with "'" & Named & "' is not a valid program attribute.";
end Attribute;
function attribute_Location (Self : access Item'Class; Named : in String) return gl.GLuint
is
use gl.Pointers;
use type gl.GLint;
attribute_Name : C.strings.chars_ptr := C.Strings.new_String (Named & ada.characters.Latin_1.NUL);
begin
Tasks.check;
declare
gl_Location : constant gl.GLint := glGetAttribLocation (Self.gl_Program,
to_GLchar_access (attribute_Name));
begin
if gl_Location = -1
then
raise Error with "Requested attribute '" & Named & "' has no gl location in program.";
end if;
C.Strings.free (attribute_Name);
return gl.GLuint (gl_Location);
end;
end attribute_Location;
function is_defined (Self : in Item'Class) return Boolean
is
use type a_gl_Program;
begin
return Self.gl_Program /= 0;
end is_defined;
function ProgramInfoLog (Self : in Item) return String
is
use C, GL;
info_log_Length : aliased glInt := 0;
chars_Written : aliased glSizei := 0;
begin
Tasks.check;
glGetProgramiv (Self.gl_Program,
GL_INFO_LOG_LENGTH,
info_log_Length'unchecked_Access);
if info_log_Length = 0 then
return "";
end if;
declare
use GL.Pointers;
info_Log : aliased C.char_array := C.char_array' (1 .. C.size_t (info_log_Length) => <>);
info_Log_ptr : constant C.strings.chars_ptr := C.strings.to_chars_ptr (info_Log'unchecked_Access);
begin
glGetProgramInfoLog (Self.gl_Program,
glSizei (info_log_Length),
chars_Written'unchecked_Access,
to_GLchar_access (info_Log_ptr));
return C.to_Ada (info_Log);
end;
end ProgramInfoLog;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.bool
is
the_Variable : Variable.uniform.bool;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.int
is
the_Variable : Variable.uniform.int;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.float
is
the_Variable : Variable.uniform.float;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.vec3
is
the_Variable : Variable.uniform.vec3;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.vec4
is
the_Variable : Variable.uniform.vec4;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.mat3
is
the_Variable : Variable.uniform.mat3;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
function uniform_Variable (Self : access Item'Class; Named : in String) return Variable.uniform.mat4
is
the_Variable : Variable.uniform.mat4;
begin
the_Variable.define (Self, Named);
return the_Variable;
end uniform_Variable;
--------------
-- Operations
--
procedure add (Self : in out Item; Attribute : in openGL.Attribute.view)
is
begin
Self.attribute_Count := Self.attribute_Count + 1;
Self.Attributes (Self.attribute_Count) := Attribute;
end add;
procedure enable (Self : in out Item)
is
use type gl.GLuint;
begin
Tasks.check;
if Self.gl_Program = 0
then
Item'Class (Self).define; -- TODO: This appears to do nothing.
end if;
glUseProgram (self.gl_Program);
end enable;
procedure enable_Attributes (Self : in Item)
is
begin
for Each in 1 .. Self.attribute_Count
loop
Self.Attributes (Each).enable;
end loop;
end enable_Attributes;
procedure mvp_Transform_is (Self : in out Item; Now : in Matrix_4x4)
is
begin
Self.mvp_Transform := Now;
end mvp_Transform_is;
procedure Scale_is (Self : in out Item; Now : in Vector_3)
is
begin
Self.Scale := Now;
end Scale_is;
procedure set_Uniforms (Self : in Item)
is
the_mvp_Uniform : constant Variable.uniform.mat4 := Self.uniform_Variable ("mvp_Transform");
the_scale_Uniform : constant Variable.uniform.vec3 := Self.uniform_Variable ("Scale");
begin
the_mvp_Uniform .Value_is (Self.mvp_Transform);
the_scale_Uniform.Value_is (Self.Scale);
end set_Uniforms;
-- Privvy
--
function gl_Program (Self : in Item) return a_gl_Program
is
begin
return Self.gl_Program;
end gl_Program;
end openGL.Program;
|