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line.jai
58 lines (42 loc) · 1.56 KB
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line.jai
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#import "GL";
#import "Math";
Line :: struct {
start : Vector3;
end : Vector3;
start_color : Vector3;
end_color : Vector3;
line_vbo_vertex : GLuint;
line_vbo_colors : GLuint;
line_data_vertex : [2]Vector3;
line_data_colors : [2]Vector3;
}
create_line_buffers :: (line: *Line) {
glGenBuffers(1, *line.line_vbo_vertex);
glBindBuffer(GL_ARRAY_BUFFER, line.line_vbo_vertex);
glBufferData(GL_ARRAY_BUFFER, size_of(type_of(line.line_data_vertex)), *line.line_data_vertex, GL_DYNAMIC_DRAW);
glGenBuffers(1, *line.line_vbo_colors);
glBindBuffer(GL_ARRAY_BUFFER, line.line_vbo_colors);
glBufferData(GL_ARRAY_BUFFER, size_of(type_of(line.line_data_colors)), *line.line_data_colors, GL_DYNAMIC_DRAW);
}
populate_line :: (line: *Line, start: Vector3, end: Vector3, start_color: Vector3, end_color: Vector3) {
line.start = start;
line.end = end;
line.start_color = start_color;
line.end_color = end_color;
line.line_data_vertex[0] = start;
line.line_data_vertex[1] = end;
line.line_data_colors[0] = start_color;
line.line_data_colors[1] = end_color;
create_line_buffers(line);
}
draw_line :: (line: *Line) {
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, line.line_vbo_vertex);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, cast(*void)0);
glBindBuffer(GL_ARRAY_BUFFER, line.line_vbo_colors);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, cast(*void)0);
glDrawArrays(GL_LINES, 0, 2);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
}