59 lines
1.9 KiB
Objective-C
59 lines
1.9 KiB
Objective-C
#import "LimeGreenStyleLayer.h"
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@import GLKit;
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@implementation LimeGreenStyleLayer {
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GLuint _program;
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GLuint _vertexShader;
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GLuint _fragmentShader;
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GLuint _buffer;
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GLuint _aPos;
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}
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- (void)didMoveToMapView:(MLNMapView *)mapView {
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static const GLchar *vertexShaderSource = "attribute vec2 a_pos; void main() { gl_Position = vec4(a_pos, 1, 1); }";
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static const GLchar *fragmentShaderSource = "void main() { gl_FragColor = vec4(0, 0.5, 0, 0.5); }";
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_program = glCreateProgram();
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_vertexShader = glCreateShader(GL_VERTEX_SHADER);
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_fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(_vertexShader, 1, &vertexShaderSource, NULL);
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glCompileShader(_vertexShader);
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glAttachShader(_program, _vertexShader);
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glShaderSource(_fragmentShader, 1, &fragmentShaderSource, NULL);
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glCompileShader(_fragmentShader);
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glAttachShader(_program, _fragmentShader);
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glLinkProgram(_program);
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_aPos = glGetAttribLocation(_program, "a_pos");
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GLfloat triangle[] = { 0, 0.5, 0.5, -0.5, -0.5, -0.5 };
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glGenBuffers(1, &_buffer);
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glBindBuffer(GL_ARRAY_BUFFER, _buffer);
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glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(GLfloat), triangle, GL_STATIC_DRAW);
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}
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- (void)drawInMapView:(MLNMapView *)mapView withContext:(MLNStyleLayerDrawingContext)context {
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glUseProgram(_program);
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glBindBuffer(GL_ARRAY_BUFFER, _buffer);
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glEnableVertexAttribArray(_aPos);
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glVertexAttribPointer(_aPos, 2, GL_FLOAT, GL_FALSE, 0, NULL);
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glDisable(GL_STENCIL_TEST);
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glDisable(GL_DEPTH_TEST);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 3);
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}
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- (void)willMoveFromMapView:(MLNMapView *)mapView {
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if (!_program) {
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return;
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}
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glDeleteBuffers(1, &_buffer);
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glDetachShader(_program, _vertexShader);
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glDetachShader(_program, _fragmentShader);
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glDeleteShader(_vertexShader);
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glDeleteShader(_fragmentShader);
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glDeleteProgram(_program);
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}
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@end
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