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#include <jni.h>
#include <GLES2/gl2.h>
#include <sstream>
#include <android/log.h>
#include <mbgl/style/layers/custom_layer.hpp>
// DEBUGGING
const char* LOG_TAG = "Custom Layer Example";
const char* stringFromError(GLenum err) {
switch (err) {
case GL_INVALID_ENUM:
return "GL_INVALID_ENUM";
case GL_INVALID_VALUE:
return "GL_INVALID_VALUE";
case GL_INVALID_OPERATION:
return "GL_INVALID_OPERATION";
case GL_INVALID_FRAMEBUFFER_OPERATION:
return "GL_INVALID_FRAMEBUFFER_OPERATION";
case GL_OUT_OF_MEMORY:
return "GL_OUT_OF_MEMORY";
#ifdef GL_TABLE_TOO_LARGE
case GL_TABLE_TOO_LARGE:
return "GL_TABLE_TOO_LARGE";
#endif
#ifdef GL_STACK_OVERFLOW
case GL_STACK_OVERFLOW:
return "GL_STACK_OVERFLOW";
#endif
#ifdef GL_STACK_UNDERFLOW
case GL_STACK_UNDERFLOW:
return "GL_STACK_UNDERFLOW";
#endif
#ifdef GL_CONTEXT_LOST
case GL_CONTEXT_LOST:
return "GL_CONTEXT_LOST";
#endif
default:
return "GL_UNKNOWN";
}
}
struct Error : std::runtime_error {
using std::runtime_error::runtime_error;
};
void checkError(const char *cmd, const char *file, int line) {
GLenum err = GL_NO_ERROR;
if ((err = glGetError()) != GL_NO_ERROR) {
std::ostringstream message;
message << cmd << ": Error " << stringFromError(err);
// Check for further errors
while ((err = glGetError()) != GL_NO_ERROR) {
message << ", " << stringFromError(err);
}
message << " at " << file << ":" << line;
__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, message.str().c_str());
throw Error(message.str());
}
}
#ifndef NDEBUG
#define GL_CHECK_ERROR(cmd) ([&]() { struct __MBGL_C_E { ~__MBGL_C_E() noexcept(false) { checkError(#cmd, __FILE__, __LINE__); } } __MBGL_C_E; return cmd; }())
#else
#define GL_CHECK_ERROR(cmd) (cmd)
#endif
void checkLinkStatus(GLuint program) {
GLint isLinked = 0;
glGetProgramiv(program, GL_LINK_STATUS, &isLinked);
if (isLinked == GL_FALSE) {
GLint maxLength = 0;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &maxLength);
GLchar infoLog[maxLength];
glGetProgramInfoLog(program, maxLength, &maxLength, &infoLog[0]);
__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, &infoLog[0]);
throw Error(infoLog);
}
}
void checkCompileStatus(GLuint shader) {
GLint isCompiled = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &isCompiled);
if (isCompiled == GL_FALSE) {
GLint maxLength = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &maxLength);
// The maxLength includes the NULL character
GLchar errorLog[maxLength];
glGetShaderInfoLog(shader, maxLength, &maxLength, &errorLog[0]);
__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, &errorLog[0]);
throw Error(errorLog);
}
}
// /DEBUGGING
static const GLchar * vertexShaderSource = "attribute vec2 a_pos; void main() { gl_Position = vec4(a_pos, 0, 1); }";
static const GLchar * fragmentShaderSource = "uniform highp vec4 fill_color; void main() { gl_FragColor = fill_color; }";
class ExampleCustomLayer: mbgl::style::CustomLayerHost {
public:
~ExampleCustomLayer() {
}
void initialize() {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "Initialize");
// Debug info
int maxAttrib;
GL_CHECK_ERROR(glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttrib));
__android_log_print(ANDROID_LOG_INFO, LOG_TAG, "Max vertex attributes: %i", maxAttrib);
program = GL_CHECK_ERROR(glCreateProgram());
vertexShader = GL_CHECK_ERROR(glCreateShader(GL_VERTEX_SHADER));
fragmentShader = GL_CHECK_ERROR(glCreateShader(GL_FRAGMENT_SHADER));
GL_CHECK_ERROR(glShaderSource(vertexShader, 1, &vertexShaderSource, nullptr));
GL_CHECK_ERROR(glCompileShader(vertexShader));
checkCompileStatus(vertexShader);
GL_CHECK_ERROR(glAttachShader(program, vertexShader));
GL_CHECK_ERROR(glShaderSource(fragmentShader, 1, &fragmentShaderSource, nullptr));
GL_CHECK_ERROR(glCompileShader(fragmentShader));
checkCompileStatus(fragmentShader);
GL_CHECK_ERROR(glAttachShader(program, fragmentShader));
GL_CHECK_ERROR(glLinkProgram(program));
checkLinkStatus(program);
a_pos = GL_CHECK_ERROR(glGetAttribLocation(program, "a_pos"));
fill_color = GL_CHECK_ERROR(glGetUniformLocation(program, "fill_color"));
GLfloat background[] = { -1, -1, 1, -1, -1, 1, 1, 1 };
GL_CHECK_ERROR(glGenBuffers(1, &buffer));
GL_CHECK_ERROR(glBindBuffer(GL_ARRAY_BUFFER, buffer));
GL_CHECK_ERROR(glBufferData(GL_ARRAY_BUFFER, 8 * sizeof(GLfloat), background, GL_STATIC_DRAW));
}
void render(const mbgl::style::CustomLayerRenderParameters&) {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "Render");
glUseProgram(program);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glEnableVertexAttribArray(a_pos);
glVertexAttribPointer(a_pos, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glDisable(GL_STENCIL_TEST);
glDisable(GL_DEPTH_TEST);
glUniform4fv(fill_color, 1, color);
GL_CHECK_ERROR(glUseProgram(program));
GL_CHECK_ERROR(glBindBuffer(GL_ARRAY_BUFFER, buffer));
GL_CHECK_ERROR(glEnableVertexAttribArray(a_pos));
GL_CHECK_ERROR(glVertexAttribPointer(a_pos, 2, GL_FLOAT, GL_FALSE, 0, NULL));
GL_CHECK_ERROR(glDisable(GL_STENCIL_TEST));
GL_CHECK_ERROR(glDisable(GL_DEPTH_TEST));
GL_CHECK_ERROR(glUniform4fv(fill_color, 1, color));
GL_CHECK_ERROR(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
}
void contextLost() {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "ContextLost");
program = 0;
}
void deinitialize() {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "DeInitialize");
if (program) {
glDeleteBuffers(1, &buffer);
glDetachShader(program, vertexShader);
glDetachShader(program, fragmentShader);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
glDeleteProgram(program);
}
}
GLuint program = 0;
GLuint vertexShader = 0;
GLuint fragmentShader = 0;
GLuint buffer = 0;
GLuint a_pos = 0;
GLuint fill_color = 0;
static GLfloat color[];
};
GLfloat ExampleCustomLayer::color[] = { 0.0f, 1.0f, 0.0f, 1.0f };
jlong JNICALL nativeCreateContext(JNIEnv*, jobject) {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "nativeCreateContext");
auto exampleCustomLayer = std::make_unique<ExampleCustomLayer>();
return reinterpret_cast<jlong>(exampleCustomLayer.release());
}
void JNICALL nativeSetColor(JNIEnv*, jobject, jfloat red, jfloat green, jfloat blue, jfloat alpha) {
__android_log_print(ANDROID_LOG_INFO, LOG_TAG, "nativeSetColor: %.2f, %.2f, %.2f, %.2f", red, green, blue, alpha);
ExampleCustomLayer::color[0] = red;
ExampleCustomLayer::color[1] = green;
ExampleCustomLayer::color[2] = blue;
ExampleCustomLayer::color[3] = alpha;
}
extern "C" JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *) {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "OnLoad");
JNIEnv *env = nullptr;
vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
jclass customLayerClass = env->FindClass("com/mapbox/mapboxsdk/testapp/model/customlayer/ExampleCustomLayer");
JNINativeMethod methods[] = {
{"createContext", "()J", reinterpret_cast<void *>(&nativeCreateContext)},
{"setColor", "(FFFF)V", reinterpret_cast<void *>(&nativeSetColor)}
};
if (env->RegisterNatives(customLayerClass, methods, 2) < 0) {
env->ExceptionDescribe();
return JNI_ERR;
}
return JNI_VERSION_1_6;
}
extern "C" JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *, void *) {
}
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