245 lines
8.2 KiB
C++
245 lines
8.2 KiB
C++
#include <GLES3/gl3.h>
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#include <android/log.h>
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#include <jni.h>
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#include <mbgl/style/layers/custom_layer.hpp>
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#include <sstream>
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#include <memory>
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// DEBUGGING
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const char *LOG_TAG = "Custom Layer Example";
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const char *stringFromError(GLenum err) {
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switch (err) {
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case GL_INVALID_ENUM:
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return "GL_INVALID_ENUM";
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case GL_INVALID_VALUE:
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return "GL_INVALID_VALUE";
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case GL_INVALID_OPERATION:
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return "GL_INVALID_OPERATION";
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case GL_INVALID_FRAMEBUFFER_OPERATION:
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return "GL_INVALID_FRAMEBUFFER_OPERATION";
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case GL_OUT_OF_MEMORY:
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return "GL_OUT_OF_MEMORY";
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#ifdef GL_TABLE_TOO_LARGE
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case GL_TABLE_TOO_LARGE:
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return "GL_TABLE_TOO_LARGE";
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#endif
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#ifdef GL_STACK_OVERFLOW
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case GL_STACK_OVERFLOW:
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return "GL_STACK_OVERFLOW";
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#endif
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#ifdef GL_STACK_UNDERFLOW
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case GL_STACK_UNDERFLOW:
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return "GL_STACK_UNDERFLOW";
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#endif
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#ifdef GL_CONTEXT_LOST
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case GL_CONTEXT_LOST:
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return "GL_CONTEXT_LOST";
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#endif
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default:
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return "GL_UNKNOWN";
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}
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}
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struct Error : std::runtime_error {
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using std::runtime_error::runtime_error;
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};
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void checkError(const char *cmd, const char *file, int line) {
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GLenum err = GL_NO_ERROR;
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if ((err = glGetError()) != GL_NO_ERROR) {
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std::ostringstream message;
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message << cmd << ": Error " << stringFromError(err);
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// Check for further errors
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while ((err = glGetError()) != GL_NO_ERROR) {
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message << ", " << stringFromError(err);
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}
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message << " at " << file << ":" << line;
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__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, message.str().c_str());
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throw Error(message.str());
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}
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}
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#ifndef NDEBUG
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#define GL_CHECK_ERROR(cmd) \
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([&]() { \
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struct __MBGL_C_E { \
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~__MBGL_C_E() noexcept(false) { \
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checkError(#cmd, __FILE__, __LINE__); \
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} \
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} __MBGL_C_E; \
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return cmd; \
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}())
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#else
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#define GL_CHECK_ERROR(cmd) (cmd)
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#endif
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void checkLinkStatus(GLuint program) {
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GLint isLinked = 0;
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glGetProgramiv(program, GL_LINK_STATUS, &isLinked);
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if (isLinked == GL_FALSE) {
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GLint maxLength = 0;
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glGetProgramiv(program, GL_INFO_LOG_LENGTH, &maxLength);
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GLchar infoLog[maxLength];
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glGetProgramInfoLog(program, maxLength, &maxLength, &infoLog[0]);
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__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, &infoLog[0]);
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throw Error(infoLog);
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}
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}
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void checkCompileStatus(GLuint shader) {
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GLint isCompiled = 0;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &isCompiled);
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if (isCompiled == GL_FALSE) {
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GLint maxLength = 0;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &maxLength);
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// The maxLength includes the NULL character
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GLchar errorLog[maxLength];
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glGetShaderInfoLog(shader, maxLength, &maxLength, &errorLog[0]);
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__android_log_write(ANDROID_LOG_ERROR, LOG_TAG, &errorLog[0]);
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throw Error(errorLog);
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}
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}
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// /DEBUGGING
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static const GLchar *vertexShaderSource =
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"#version 300 es\nlayout (location = 0) in vec2 a_pos; void main() { "
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"gl_Position = vec4(a_pos, 0, 1); }";
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static const GLchar *fragmentShaderSource =
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"#version 300 es\nuniform highp vec4 fill_color; out highp vec4 fragColor; "
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"void main() { fragColor = fill_color; }";
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class ExampleCustomLayer : mbgl::style::CustomLayerHost {
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public:
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~ExampleCustomLayer() {}
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void initialize() {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "Initialize");
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// Debug info
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int maxAttrib;
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GL_CHECK_ERROR(glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttrib));
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__android_log_print(ANDROID_LOG_INFO, LOG_TAG, "Max vertex attributes: %i", maxAttrib);
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program = GL_CHECK_ERROR(glCreateProgram());
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vertexShader = GL_CHECK_ERROR(glCreateShader(GL_VERTEX_SHADER));
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fragmentShader = GL_CHECK_ERROR(glCreateShader(GL_FRAGMENT_SHADER));
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GL_CHECK_ERROR(glShaderSource(vertexShader, 1, &vertexShaderSource, nullptr));
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GL_CHECK_ERROR(glCompileShader(vertexShader));
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checkCompileStatus(vertexShader);
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GL_CHECK_ERROR(glAttachShader(program, vertexShader));
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GL_CHECK_ERROR(glShaderSource(fragmentShader, 1, &fragmentShaderSource, nullptr));
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GL_CHECK_ERROR(glCompileShader(fragmentShader));
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checkCompileStatus(fragmentShader);
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GL_CHECK_ERROR(glAttachShader(program, fragmentShader));
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GL_CHECK_ERROR(glLinkProgram(program));
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checkLinkStatus(program);
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a_pos = GL_CHECK_ERROR(glGetAttribLocation(program, "a_pos"));
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fill_color = GL_CHECK_ERROR(glGetUniformLocation(program, "fill_color"));
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GLfloat background[] = {-1, -1, 1, -1, -1, 1, 1, 1};
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GL_CHECK_ERROR(glGenBuffers(1, &buffer));
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GL_CHECK_ERROR(glBindBuffer(GL_ARRAY_BUFFER, buffer));
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GL_CHECK_ERROR(glBufferData(GL_ARRAY_BUFFER, 8 * sizeof(GLfloat), background, GL_STATIC_DRAW));
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}
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void render(const mbgl::style::CustomLayerRenderParameters &) {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "Render");
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glUseProgram(program);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glEnableVertexAttribArray(a_pos);
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glVertexAttribPointer(a_pos, 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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glUniform4fv(fill_color, 1, color);
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GL_CHECK_ERROR(glUseProgram(program));
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GL_CHECK_ERROR(glBindBuffer(GL_ARRAY_BUFFER, buffer));
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GL_CHECK_ERROR(glEnableVertexAttribArray(a_pos));
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GL_CHECK_ERROR(glVertexAttribPointer(a_pos, 2, GL_FLOAT, GL_FALSE, 0, NULL));
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GL_CHECK_ERROR(glDisable(GL_STENCIL_TEST));
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GL_CHECK_ERROR(glDisable(GL_DEPTH_TEST));
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GL_CHECK_ERROR(glUniform4fv(fill_color, 1, color));
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GL_CHECK_ERROR(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
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}
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void contextLost() {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "ContextLost");
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program = 0;
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}
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void deinitialize() {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "DeInitialize");
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if (program) {
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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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}
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GLuint program = 0;
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GLuint vertexShader = 0;
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GLuint fragmentShader = 0;
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GLuint buffer = 0;
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GLuint a_pos = 0;
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GLuint fill_color = 0;
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static GLfloat color[];
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};
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GLfloat ExampleCustomLayer::color[] = {0.0f, 1.0f, 0.0f, 1.0f};
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jlong JNICALL nativeCreateContext(JNIEnv *, jobject) {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "nativeCreateContext");
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auto exampleCustomLayer = std::make_unique<ExampleCustomLayer>();
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return reinterpret_cast<jlong>(exampleCustomLayer.release());
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}
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void JNICALL nativeSetColor(JNIEnv *, jobject, jfloat red, jfloat green, jfloat blue, jfloat alpha) {
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__android_log_print(ANDROID_LOG_INFO, LOG_TAG, "nativeSetColor: %.2f, %.2f, %.2f, %.2f", red, green, blue, alpha);
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ExampleCustomLayer::color[0] = red;
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ExampleCustomLayer::color[1] = green;
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ExampleCustomLayer::color[2] = blue;
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ExampleCustomLayer::color[3] = alpha;
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}
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extern "C" JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *) {
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__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "OnLoad");
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JNIEnv *env = nullptr;
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vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
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jclass customLayerClass = env->FindClass("org/maplibre/android/testapp/model/customlayer/ExampleCustomLayer");
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JNINativeMethod methods[] = {{"createContext", "()J", reinterpret_cast<void *>(&nativeCreateContext)},
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{"setColor", "(FFFF)V", reinterpret_cast<void *>(&nativeSetColor)}};
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if (env->RegisterNatives(customLayerClass, methods, 2) < 0) {
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env->ExceptionDescribe();
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return JNI_ERR;
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}
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return JNI_VERSION_1_6;
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}
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extern "C" JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *, void *) {}
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