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Add Gl class to manage OpenGL drawing operations for a Window.

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This commit is contained in:
Josh Holtrop 2020-12-10 20:21:17 -05:00
parent 4775435df4
commit 24b7ee9f16
2 changed files with 82 additions and 54 deletions
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66
src/jes/gui/gl.d Normal file
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@ -0,0 +1,66 @@
module jes.gui.gl;
static import gltk;
import derelict.opengl;
import jes.gui.font;
class Gl
{
alias FlatProgram = gltk.Program!("viewport_size", "2i", "color", "4f", "position", "2i");
alias TextProgram = gltk.Program!("viewport_size", "2i", "texture", "1i", "color", "4f", "position", "2i");
alias RectProgram = gltk.Program!("viewport_size", "2i", "color", "4f", "position", "2i", "size", "2i");
private FlatProgram m_flat_program;
private TextProgram m_text_program;
private RectProgram m_rect_program;
this()
{
m_flat_program = new FlatProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/flat.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/flat.f.glsl"),
"coords", 0);
m_text_program = new TextProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/text.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/text.f.glsl"),
"coords", 0);
m_text_program.set_texture(0);
m_rect_program = new RectProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/rect.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/rect.f.glsl"),
"coords", 0);
glActiveTexture(GL_TEXTURE0);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void resize(int width, int height)
{
glViewport(0, 0, width, height);
m_flat_program.use();
m_flat_program.set_viewport_size(width, height);
m_text_program.use();
m_text_program.set_viewport_size(width, height);
m_rect_program.use();
m_rect_program.set_viewport_size(width, height);
}
void draw_character(Font font, uint char_code, int x, int y, float r, float g, float b, float a)
{
m_text_program.use();
m_text_program.set_color(r, g, b, a);
m_text_program.set_position(x, y);
auto glyph = font.get_glyph(char_code);
glyph.render();
}
private gltk.Shader build_shader(GLenum shader_type, string filename)
{
auto shader = new gltk.Shader(shader_type);
shader.set_source_from_file(filename);
return shader;
}
}

70
src/jes/gui/window.d
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@ -1,23 +1,15 @@
module jes.gui.window;
static import gltk;
static import jtk;
import derelict.opengl;
import jes.gui.font;
import jes.gui.gl;
import derelict.opengl;
class Window
{
alias FlatProgram = gltk.Program!("viewport_size", "2i", "color", "4f", "position", "2i");
alias TextProgram = gltk.Program!("viewport_size", "2i", "texture", "1i", "color", "4f", "position", "2i");
alias RectProgram = gltk.Program!("viewport_size", "2i", "color", "4f", "position", "2i", "size", "2i");
private jtk.Window m_window;
private FlatProgram m_flat_program;
private TextProgram m_text_program;
private RectProgram m_rect_program;
private int m_width;
private int m_height;
private bool m_loaded;
private Gl m_gl;
Font m_font;
static Window[jtk.Window] jtk_windows;
@ -25,6 +17,7 @@ class Window
{
m_window = new jtk.Window();
jtk_windows[m_window] = this;
m_font = new Font("share/jes/fonts/freefont-ttf-20120503/FreeMono.ttf", 20);
}
void close()
@ -33,42 +26,10 @@ class Window
jtk_windows.remove(m_window);
}
private gltk.Shader build_shader(GLenum shader_type, string filename)
{
auto shader = new gltk.Shader(shader_type);
shader.set_source_from_file(filename);
return shader;
}
private void load()
{
if (!m_loaded)
{
m_flat_program = new FlatProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/flat.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/flat.f.glsl"),
"coords", 0);
m_text_program = new TextProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/text.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/text.f.glsl"),
"coords", 0);
m_rect_program = new RectProgram(
build_shader(GL_VERTEX_SHADER, "share/jes/shaders/rect.v.glsl"),
build_shader(GL_FRAGMENT_SHADER, "share/jes/shaders/rect.f.glsl"),
"coords", 0);
glActiveTexture(GL_TEXTURE0);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
m_loaded = true;
}
}
void resize(int width, int height)
{
m_width = width;
m_height = height;
load();
glViewport(0, 0, width, height);
load_gl();
m_gl.resize(width, height);
draw();
}
@ -76,17 +37,18 @@ class Window
{
glClearColor(0.5, 0.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
auto font = new Font("share/jes/fonts/freefont-ttf-20120503/FreeMono.ttf", 20);
auto glyph = font.get_glyph('h');
m_text_program.use();
m_text_program.set_viewport_size(m_width, m_height);
m_text_program.set_texture(0);
m_text_program.set_color(1.0, 1.0, 1.0, 1.0);
m_text_program.set_position(100, 10);
glyph.render();
m_gl.draw_character(m_font, 'h', 50, 50, 1.0, 0.9, 0.8, 1.0);
m_window.swap_buffers();
}
private void load_gl()
{
if (m_gl is null)
{
m_gl = new Gl();
}
}
static Window opIndex(jtk.Window jtk_window)
{
return jtk_windows[jtk_window];