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Add Gl.draw_rect().

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This commit is contained in:
Josh Holtrop 2020-12-10 20:40:03 -05:00
parent e51953445b
commit a53b53e864
2 changed files with 36 additions and 1 deletions
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36
src/jes/gui/gl.d
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@ -13,24 +13,47 @@ class Gl
private FlatProgram m_flat_program;
private TextProgram m_text_program;
private RectProgram m_rect_program;
private gltk.Array m_rect_array;
private gltk.Buffer m_rect_buffer;
this()
private void build_flat_program()
{
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);
}
private void build_text_program()
{
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.use();
m_text_program.set_texture(0);
}
private void build_rect_program()
{
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);
m_rect_array = new gltk.Array();
m_rect_array.bind();
m_rect_buffer = new gltk.Buffer(GL_ARRAY_BUFFER);
GLint[] rect_coords = [0, 0, 1, 0, 1, 1, 0, 1];
m_rect_buffer.set_buffer_data(GL_STATIC_DRAW, rect_coords);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_INT, GL_FALSE, 0, null);
}
this()
{
build_flat_program();
build_text_program();
build_rect_program();
glActiveTexture(GL_TEXTURE0);
glEnable(GL_BLEND);
@ -57,6 +80,17 @@ class Gl
glyph.render();
}
void draw_rect(int x, int y, int width, int height,
float r, float g, float b, float a)
{
m_rect_array.bind();
m_rect_program.use();
m_rect_program.set_color(r, g, b, a);
m_rect_program.set_position(x, y);
m_rect_program.set_size(width, height);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
private gltk.Shader build_shader(GLenum shader_type, string filename)
{
auto shader = new gltk.Shader(shader_type);

1
src/jes/gui/window.d
View File

@ -37,6 +37,7 @@ class Window
{
glClearColor(0.5, 0.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
m_gl.draw_rect(50, 50, 20, 20, 0.0, 0.2, 0.4, 1.0);
m_gl.draw_character(m_font, 'h', 50, 50, 1.0, 0.9, 0.8, 1.0);
m_window.swap_buffers();
}