void app_initialize(App *app)
{
glGenVertexArrays(1, &app->vao);
glBindVertexArray(app->vao);
glViewport(0, 0, app->window_width, app->window_height);
app->vbo_cube = make_cube_mesh();
app->vbo_quad = make_quad_mesh();
get_attrib_location (mapping, position);
get_uniform_location(mapping, height_scale);
get_uniform_location(mapping, use_mip);
get_uniform_location(mapping, max_lod_coverage);
get_uniform_location(mapping, screen_size);
get_uniform_location(mapping, diffusemap);
get_uniform_location(mapping, heightmap);
get_uniform_location(mapping, model);
get_uniform_location(mapping, view);
get_uniform_location(mapping, projection);
get_attrib_location (backdrop, position);
get_uniform_location(backdrop, sun_dir);
get_uniform_location(backdrop, screen_size);
get_uniform_location(backdrop, inv_tan_fov);
get_uniform_location(backdrop, view);
app->current_scene = 0;
}
// call this to bind attribute names
int bind_light_shader_attributes(GLuint program) {
int errors = 0;
errors += get_attrib_location(&OGLAttr::lighting_shader.coord, "l_coord", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.mvp, "l_mvp", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.position_map, "g_position_map", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.color_map, "g_color_map", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.color_t_map, "g_color_t_map", program);
//errors += get_uniform_location(&OGLAttr::lighting_shader.normal_map, "g_normal_map", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.shadow_map, "g_shadow_map", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.shadow_mvp, "l_shadow_mvp", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.screen_size, "l_screen_size", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.val, "l_val", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.properties, "l_properties", program);
errors += get_uniform_location(&OGLAttr::lighting_shader.draw_mode, "l_draw_mode", program);
if (errors) {
printf("Could not bind one of the above variables. Aborting\n");
return errors;
}
printf("Done loading lighting shaders: %d\n", glGetError());
return 0;
}
void create_font_renderer(FontRenderer* r) {
// First create shader program
create_program_from_files(&r->sp, 2, "../shaders/text.glslv",
"../shaders/text.glslf");
// Create the vertex buffer object
glGenVertexArrays(1, &r->vao);
glBindVertexArray(r->vao);
glGenBuffers(1, &r->vbo);
// Set up attribute array
glBindBuffer(GL_ARRAY_BUFFER, r->vbo);
unsigned int pos_attrib = get_attrib_location(&r->sp, "position");
glEnableVertexAttribArray(pos_attrib);
glVertexAttribPointer(pos_attrib, 3, GL_FLOAT, GL_FALSE,
sizeof(BufferData), 0);
unsigned int tex_attrib = get_attrib_location(&r->sp, "tex_coord");
glEnableVertexAttribArray(tex_attrib);
glVertexAttribPointer(tex_attrib, 2, GL_FLOAT, GL_FALSE,
sizeof(BufferData), NULL+sizeof(vec3));
glBindVertexArray(0);
}
// call this to bind attribute names
int bind_geometry_shader_attributes(GLuint program) {
int errors = 0;
errors += get_attrib_location(&OGLAttr::geometry_shader.coord, "g_coord", program);
errors += get_attrib_location(&OGLAttr::geometry_shader.texture_coord, "g_texturecoord", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.mvp, "g_mvp", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.world_transform, "g_worldtransform", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.draw_mode, "g_drawmode", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.intensity, "g_intensity", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.alphacutoff, "g_alphacutoff", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.enable_shadows, "g_enable_shadows", program);
errors += get_uniform_location(&OGLAttr::geometry_shader.tile_texture, "tile_texture", program);
if (errors) {
printf("Could not bind one of the above variables. Aborting\n");
return errors;
}
printf("Done loading geometry shaders: %d\n", glGetError());
return 0;
}
int bind_shadow_shader_attributes(GLuint program) {
int errors = 0;
errors += get_attrib_location(&OGLAttr::shadow_shader.coord, "g_coord", program);
errors += get_uniform_location(&OGLAttr::shadow_shader.mvp, "g_mvp", program);
if (errors) {
printf("Could not bind one of the above variables. Aborting\n");
return errors;
}
printf("Done loading lighting shaders: %d\n", glGetError());
return 0;
}
void app_initialize(App *app)
{
// Make sure the required extensions are present.
const GLubyte* extensions = glGetString(GL_EXTENSIONS);
char * found_multiview2_extension = strstr ((const char*)extensions, "GL_OVR_multiview2");
char * found_multisample_multiview_extension = strstr ((const char*)extensions, "GL_OVR_multiview_multisampled_render_to_texture");
char * found_border_clamp_extension = strstr ((const char*)extensions, "GL_EXT_texture_border_clamp");
if (found_multiview2_extension == NULL)
{
LOGI("OpenGL ES 3.0 implementation does not support GL_OVR_multiview2 extension.\n");
exit(EXIT_FAILURE);
}
if (found_multisample_multiview_extension == NULL)
{
// If multisampled multiview is not supported, multisampling will not be used, so no need to exit here.
LOGI("OpenGL ES 3.0 implementation does not support GL_OVR_multiview_multisampled_render_to_texture extension.\n");
}
if (found_border_clamp_extension == NULL)
{
LOGI("OpenGL ES 3.0 implementation does not support GL_EXT_texture_border_clamp extension.\n");
exit(EXIT_FAILURE);
}
GL_CHECK(glGenVertexArrays(1, &app->vao));
GL_CHECK(glBindVertexArray(app->vao));
GL_CHECK(glViewport(0, 0, app->window_width, app->window_height));
app->vbo_cube = make_cube();
app->fb = make_eye_framebuffer(Eye_Fb_Resolution_X, Eye_Fb_Resolution_Y, Num_Views);
// The coefficients below may be calibrated by photographing an
// image containing straight lines, both vertical and horizontal,
// through the lenses of the HMD, at the position where the viewer
// would be looking through them.
// Ideally, the user would be allowed to calibrate them for their
// own eyes, through some calibration utility. The application should
// then load a stored user-profile on runtime. For now, we hardcode
// some values based on our calibration of the SM-R320 Gear VR
// lenses.
// Left lens
app->hmd.left.coefficients_red.k1 = 0.19f;
app->hmd.left.coefficients_red.k2 = 0.21f;
app->hmd.left.coefficients_red.k3 = 0.0f;
app->hmd.left.coefficients_red.p1 = 0.0f;
app->hmd.left.coefficients_red.p2 = 0.0f;
app->hmd.left.coefficients_green.k1 = 0.22f;
app->hmd.left.coefficients_green.k2 = 0.24f;
app->hmd.left.coefficients_green.k3 = 0.0f;
app->hmd.left.coefficients_green.p1 = 0.0f;
app->hmd.left.coefficients_green.p2 = 0.0f;
app->hmd.left.coefficients_blue.k1 = 0.24f;
app->hmd.left.coefficients_blue.k2 = 0.26f;
app->hmd.left.coefficients_blue.k3 = 0.0f;
app->hmd.left.coefficients_blue.p1 = 0.0f;
app->hmd.left.coefficients_blue.p2 = 0.0f;
// Right lens
app->hmd.right.coefficients_red.k1 = 0.19f;
app->hmd.right.coefficients_red.k2 = 0.21f;
app->hmd.right.coefficients_red.k3 = 0.0f;
app->hmd.right.coefficients_red.p1 = 0.0f;
app->hmd.right.coefficients_red.p2 = 0.0f;
app->hmd.right.coefficients_green.k1 = 0.22f;
app->hmd.right.coefficients_green.k2 = 0.24f;
app->hmd.right.coefficients_green.k3 = 0.0f;
app->hmd.right.coefficients_green.p1 = 0.0f;
app->hmd.right.coefficients_green.p2 = 0.0f;
app->hmd.right.coefficients_blue.k1 = 0.24f;
app->hmd.right.coefficients_blue.k2 = 0.26f;
app->hmd.right.coefficients_blue.k3 = 0.0f;
app->hmd.right.coefficients_blue.p1 = 0.0f;
app->hmd.right.coefficients_blue.p2 = 0.0f;
// These may be computed by measuring the distance between the top
// of the unscaled distorted image and the top of the screen. Denote
// this distance by Delta. The normalized view coordinate of the
// distorted image top is
// Y = 1 - 2 Delta / Screen_Size_Y
// We want to scale this coordinate such that it maps to the top of
// the view. That is,
// Y * fill_scale = 1
// Solving for fill_scale gives the equations below.
float delta = Centimeter(0.7f);
app->hmd.left.fill_scale = 1.0f / (1.0f - 2.0f * delta / Screen_Size_Y);
app->hmd.right.fill_scale = 1.0f / (1.0f - 2.0f * delta / Screen_Size_Y);
// These are computed such that the centers of the displayed framebuffers
// on the device are seperated by the viewer's IPD.
app->hmd.left.image_centre = vec2(+1.0f - Eye_IPD / (Screen_Size_X / 2.0f), 0.0f);
app->hmd.right.image_centre = vec2(-1.0f + Eye_IPD / (Screen_Size_X / 2.0f), 0.0f);
// These are computed such that the distortion takes place around
// an offset determined by the difference between lens seperation
// and the viewer's eye IPD. If the difference is zero, the distortion
// takes place around the image centre.
app->hmd.left.distort_centre = vec2((Lens_IPD - Eye_IPD) / (Screen_Size_X / 2.0f), 0.0f);
app->hmd.right.distort_centre = vec2((Eye_IPD - Lens_IPD) / (Screen_Size_X / 2.0f), 0.0f);
app->warp_mesh[0] = make_warp_mesh(app->hmd.left);
app->warp_mesh[1] = make_warp_mesh(app->hmd.right);
get_attrib_location( distort, position);
get_attrib_location( distort, uv_red_low_res);
get_attrib_location( distort, uv_green_low_res);
get_attrib_location( distort, uv_blue_low_res);
get_attrib_location( distort, uv_red_high_res);
get_attrib_location( distort, uv_green_high_res);
get_attrib_location( distort, uv_blue_high_res);
get_uniform_location(distort, layer_index);
get_uniform_location(distort, framebuffer);
get_attrib_location (cube, position);
get_attrib_location (cube, normal);
get_uniform_location(cube, projection);
get_uniform_location(cube, view);
get_uniform_location(cube, model);
}