20d9e1028c
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Bart Louwers <bart@emeel.net>
59 lines
2.0 KiB
Objective-C
59 lines
2.0 KiB
Objective-C
#import "LimeGreenStyleLayer.h"
|
|
#import <GLKit/GLKit.h>
|
|
|
|
@implementation LimeGreenStyleLayer {
|
|
GLuint _program;
|
|
GLuint _vertexShader;
|
|
GLuint _fragmentShader;
|
|
GLuint _buffer;
|
|
GLuint _aPos;
|
|
}
|
|
|
|
- (void)didMoveToMapView:(MLNMapView *)mapView {
|
|
static const GLchar *vertexShaderSource = "#version 300 es\nlayout (location = 0) in vec2 a_pos; void main() { gl_Position = vec4(a_pos, 1, 1); }";
|
|
static const GLchar *fragmentShaderSource = "#version 300 es\nout highp vec4 fragColor; void main() { fragColor = vec4(0, 0.5, 0, 0.5); }";
|
|
|
|
_program = glCreateProgram();
|
|
_vertexShader = glCreateShader(GL_VERTEX_SHADER);
|
|
_fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
|
|
|
|
glShaderSource(_vertexShader, 1, &vertexShaderSource, NULL);
|
|
glCompileShader(_vertexShader);
|
|
glAttachShader(_program, _vertexShader);
|
|
glShaderSource(_fragmentShader, 1, &fragmentShaderSource, NULL);
|
|
glCompileShader(_fragmentShader);
|
|
glAttachShader(_program, _fragmentShader);
|
|
glLinkProgram(_program);
|
|
_aPos = glGetAttribLocation(_program, "a_pos");
|
|
|
|
GLfloat triangle[] = { 0, 0.5, 0.5, -0.5, -0.5, -0.5 };
|
|
glGenBuffers(1, &_buffer);
|
|
glBindBuffer(GL_ARRAY_BUFFER, _buffer);
|
|
glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(GLfloat), triangle, GL_STATIC_DRAW);
|
|
}
|
|
|
|
- (void)drawInMapView:(MLNMapView *)mapView withContext:(MLNStyleLayerDrawingContext)context {
|
|
glUseProgram(_program);
|
|
glBindBuffer(GL_ARRAY_BUFFER, _buffer);
|
|
glEnableVertexAttribArray(_aPos);
|
|
glVertexAttribPointer(_aPos, 2, GL_FLOAT, GL_FALSE, 0, NULL);
|
|
glDisable(GL_STENCIL_TEST);
|
|
glDisable(GL_DEPTH_TEST);
|
|
glDrawArrays(GL_TRIANGLE_STRIP, 0, 3);
|
|
}
|
|
|
|
- (void)willMoveFromMapView:(MLNMapView *)mapView {
|
|
if (!_program) {
|
|
return;
|
|
}
|
|
|
|
glDeleteBuffers(1, &_buffer);
|
|
glDetachShader(_program, _vertexShader);
|
|
glDetachShader(_program, _fragmentShader);
|
|
glDeleteShader(_vertexShader);
|
|
glDeleteShader(_fragmentShader);
|
|
glDeleteProgram(_program);
|
|
}
|
|
|
|
@end
|