static void update(void)
{
uint8_t tmp[6] = {0};
int16_t a[3] = {0};
uint8_t tmpreg = 0;
L3GD20_Read(&tmpreg, L3GD20_CTRL_REG4_ADDR, 1);
L3GD20_Read(tmp, L3GD20_OUT_X_L_ADDR, 6);
/* check in the control register 4 the data alignment (Big Endian or Little Endian)*/
if (!(tmpreg & 0x40)) {
for (int i = 0; i < 3; i++)
a[i] = (int16_t)(((uint16_t)tmp[2 * i + 1] << 8) | (uint16_t)tmp[2 * i]);
} else {
for (int i = 0; i < 3; i++)
a[i] = (int16_t)(((uint16_t)tmp[2 * i] << 8) | (uint16_t)tmp[2 * i + 1]);
}
if (STM_EVAL_PBGetState(BUTTON_USER)) {
mesh = (mesh + 1) % 3; // next mesh
r3d_primitive_winding = windings[mesh];
itoa(meshes[mesh].count / 3, info_str, 10);
strcat(info_str, " tris");
while (STM_EVAL_PBGetState(BUTTON_USER)); // debounce
}
float delta = frametime - time;
frametime = time; // make frametime a consistent time value during the frames
for (int i = 0; i < 3; i++)
axes[i] += (float)a[i] * delta / 114.285f;
if (axes[0] < 0) axes[0] = 0;
if (axes[0] > 180) axes[0] = 180;
model = mat4_mul(
mat4_rotation(axes[0], vec3(1.0f, 0.0f, 0.0f)),
mat4_rotation(axes[1], vec3(0.0f, 1.0f, 0.0f)));
if (mesh == 1) model = mat4_mul(model, mat4_scaling(vec3(0.5f, 0.5f, 0.5f)));
mv = mat4_mul(view, model);
mvp = mat4_mul(projection, mv);
}
int main(int argc, char *argv[])
{
uint32_t width = 1920, height = 1080;
LoadOpenGLESWindow(width, height);
// initial opengl state
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
glDisable(GL_CULL_FACE);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// load textures
GLfloat max_anisotropy;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &max_anisotropy);
GLuint textures[TEXTURES_NUM];
glGenTextures(TEXTURES_NUM, textures);
int i;
for (i = 0; i < TEXTURES_NUM; i++)
{
int x, y, n;
unsigned char *data = stbi_load(texture_files[i], &x, &y, &n, 3);
if (data == NULL)
{
fprintf(stderr, "Could not load file: %s", texture_files[i]);
exit(-1);
}
glBindTexture(GL_TEXTURE_2D, textures[i]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, x, y, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY, max_anisotropy);
stbi_image_free(data);
}
// load program
GLuint programObject = LoadProgram(vertex_shader, fragment_shader);
glUseProgram(programObject);
glUniform1i(glGetUniformLocation(programObject, "tex"), 0);
GLint colorUniformLocation = glGetUniformLocation(programObject, "color");
GLint transformUniformLocation = glGetUniformLocation(programObject, "transform");
// load quad data
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, quad_vertices);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, quad_texcoord);
glEnableVertexAttribArray(1);
unsigned int frames = 0;
while(1)
{
glViewport(0, 0, width, height);
// animation params
double t = (frames++) * 0.02f;
float a = 0.5f + 0.5f * sinf(t * 13.0f);
float x = 0.2f * sinf(32.0f * t) * sinf(3.5f * t);
float y = 0.1f * sinf(23.0f * t) * sinf(3.5f * t);
// camera config
mat4_t proj = mat4_perspective(50.0f, (float)width / (float)height, 0.1f, 1000.0f);
mat4_t view = mat4_mul(//mat4_mul(
mat4_translation(vec3(x, y, -3.0f)), // positioning
mat4_rotation(-90.0f, vec3(0.0f, 0.0f, 1.0f)));//, // beamer rotation
//mat4_rotation(180.0f, vec3(0.0f, 1.0f, 0.0f))); // horizontal "flip"
mat4_t vp = mat4_mul(proj, view);
// color
glUniform3f(colorUniformLocation,
a * (0.5f + 0.5f * sinf(t)),
a * (0.5f + 0.5f * sinf(1.3f * t)),
a * (0.5f + 0.5f * sinf(1.7f * t)));
// draw radials
int i;
for (i = 0; i < 3; i++)
{
mat4_t mvp = mat4_mul(vp, mat4_rotation(20.0f * cos(t * 2.0f), vec3(0.0f, 1.0f, 0.0f)));
mvp = mat4_mul(mvp, mat4_translation(vec3(0.0f, 0.8f, 0.0f)));
mvp = mat4_mul(mvp, mat4_rotation(t * 32.0f * (0.5f + (i - 1)), vec3(0.0f, 0.0f, 1.0f)));
glUniformMatrix4fv(transformUniformLocation, 1, GL_FALSE, mvp.m);
glBindTexture(GL_TEXTURE_2D, textures[RADIAL0 + i]);
glDrawArrays(GL_TRIANGLES, 0, 6);
}
// draw text
mat4_t mvp = mat4_mul(vp, mat4_rotation(60.0f * sin(t), vec3(0.0f, 1.0f, 0.0f)));
mvp = mat4_mul(mvp, mat4_translation(vec3(0.0f, -0.8f, 0.0f)));
glUniformMatrix4fv(transformUniformLocation, 1, GL_FALSE, mvp.m);
glBindTexture(GL_TEXTURE_2D, textures[TEXT]);
glDrawArrays(GL_TRIANGLES, 0, 6);
// present
eglSwapBuffers(display, surface);
}
}
