GLES-TEST

build.scm

(use utils)
(system "gcc test.c -lEGL -lGLESv2 -lglfw3")
(exit)

ERROR-CODE

$ ./a.exe

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
Assertion failed!

Program: C:\msys64\home\bis\gltest\a.exe
File: ../src/libANGLE/ContextState.h, Line 153

Expression: mSavedArgsType->hasDynamicType(T::TypeInfo)

test.c

#define GLFW_INCLUDE_ES2
#include <GLFW/glfw3.h>
#include <stdio.h>

void error_callback(int error, const char* desc) {
  fprintf(stdout, "%s\n", desc);
}

int main() {
  glfwInit();
  glfwSetErrorCallback(error_callback);
  glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
  glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);

  GLFWwindow* wp = glfwCreateWindow(320, 240, "test", NULL, NULL);
  glfwMakeContextCurrent(wp);

  //fprintf(stdout, "GL_VENDOR: %s\n", glGetString(GL_VENDOR));
  //fprintf(stdout, "GL_RENDERER: %s\n", glGetString(GL_RENDERER));
  //fprintf(stdout, "GL_VERSION: %s\n", glGetString(GL_VERSION));
  //fprintf(stdout, "GL_EXTENSIONS: %s\n", glGetString(GL_EXTENSIONS));

  GLuint ib;
  glGenBuffers(1, &ib);
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ib);
  unsigned short idata[] = { 0, 0 };
  glBufferData(GL_ELEMENT_ARRAY_BUFFER, 4, idata, GL_STATIC_DRAW);
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

  // VertexShader
  const char* vssource =
    "#version 100\n"
    "void main() { gl_PointSize = 10.0; gl_Position = vec4(0, 0, 0, 1); }";
  GLuint vs = glCreateShader(GL_VERTEX_SHADER);
  glShaderSource(vs, 1, &vssource, NULL);
  glCompileShader(vs);
  // FragmentShader
  const char* fssource =
    "#version 100\n"
    "void main() { gl_FragColor = vec4(1, 1, 1, 1); }";
  GLuint fs = glCreateShader(GL_FRAGMENT_SHADER);
  glShaderSource(fs, 1, &fssource, NULL);
  glCompileShader(fs);
  // Program
  GLuint program = glCreateProgram();
  glAttachShader(program, vs);
  glAttachShader(program, fs);
  glLinkProgram(program);

  while(!glfwWindowShouldClose(wp)) {
    glfwPollEvents();
    glUseProgram(program);
    glClearColor(1, 0, 0, 0);
    glClear(GL_COLOR_BUFFER_BIT);
    // ng
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ib);
    glDrawElements(GL_POINTS, 1, GL_UNSIGNED_SHORT, NULL);
    // ok
    glDrawArrays(GL_POINTS, 0, 1);
    glfwSwapBuffers(wp);
  }
  return 0;
}