example_texgen(void)
: scale(1.0f)
, aspect(1.0f)
{
gl.uniform(erg.scale_loc, scale, scale);
gl.disable(GL.depth_test);
}
lighting_example(
const example_params& params,
const example_state_view& state,
eagine::memory::buffer& temp_buffer
): erase_prog(params)
, light_prog(params)
, background(
temp_buffer,
(shapes::vertex_attrib_kind::position |0),
36, 72
), shape(
temp_buffer,
(shapes::vertex_attrib_kind::position |0)+
(shapes::vertex_attrib_kind::normal |1)+
(shapes::vertex_attrib_kind::wrap_coord|2),
96, 144
), shp_turns(0.0f)
, cam_orbit(0.0f)
, cam_turns(0.0f)
, cam_pitch(0.5f)
, cam_dist_dir(-1)
, cam_turn_dir(1)
, cam_elev_dir(1)
{
gl.clear_depth(1);
gl.disable(GL.cull_face);
set_projection(state);
}
void resize(const example_state_view& state)
override
{
gl.viewport(state.width(), state.height());
aspect = state.aspect();
gl.uniform(prog.scale_loc, scale*aspect, scale);
}
example_program(void)
{
shader vs(GL.vertex_shader);
vs.source(glsl_literal(
"#version 140\n"
"uniform mat4 Projection;\n"
"in vec4 Position;\n"
"in vec3 Normal;\n"
"in vec3 BoxCoord;\n"
"in vec3 TexCoord;\n"
"out vec2 vertCoord;\n"
"out vec3 vertColor1;\n"
"out vec3 vertColor2;\n"
"void main(void)\n"
"{\n"
" gl_Position = Projection*Position;\n"
" vertColor1 = mix(BoxCoord,abs(Normal),0.5);\n"
" vertColor2 = vertColor1 * 0.3;\n"
" vertCoord = TexCoord.xy*(2+TexCoord.z);\n"
"}\n"
));
vs.compile();
shader fs(GL.fragment_shader);
fs.source(glsl_literal(
"#version 140\n"
"in vec2 vertCoord;\n"
"in vec3 vertColor1;\n"
"in vec3 vertColor2;\n"
"out vec3 fragColor;\n"
"float pattern(vec2 tc)\n"
"{\n"
" return float((int(tc.x)%2+int(tc.y)%2)%2);\n"
"}\n"
"void main(void)\n"
"{\n"
" float c = pattern(vertCoord);\n"
" fragColor = mix(vertColor1, vertColor2, c);\n"
"}\n"
));
fs.compile();
attach(vs);
attach(fs);
link();
report_link_error();
gl.use(*this);
gl.query_location(projection, *this, "Projection");
}
void init(const texture_image_file& image_data)
{
gl.bind(GL.texture_2d, *this);
gl.texture_min_filter(GL.texture_2d, GL.nearest);
gl.texture_mag_filter(GL.texture_2d, GL.nearest);
gl.texture_wrap(
GL.texture_2d,
GL.texture_wrap_s,
GL.repeat
);
gl.texture_image_2d(GL.texture_2d, image_data.spec());
}
voronoi_program(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::program_source,
cstr_ref("014_voronoi.oglpprog")
);
_init(program_source_file(cstr_ref(path)));
gl.use(*this);
gl.query_location(offset_loc, *this, "Offset");
gl.query_location(scale_loc, *this, "Scale");
}
lighting_program(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::program_source,
cstr_ref("028_lighting-lt.oglpprog")
);
build_program(*this, program_source_file(cstr_ref(path)));
gl.use(*this);
gl.query_location(projection, *this, "Projection");
gl.query_location(modelview, *this, "Modelview");
}
void user_idle(const example_state_view& state)
override
{
if(state.user_idle_time() > seconds_(1))
{
const float t = value(state.frame_duration())*60;
scale *= std::pow(1.f+0.05f*t, scale_dir);
if(scale < min_scale)
{
scale_dir *= -1.f;
ofs_x_dir *= -1.f;
ofs_y_dir *= ofs_x_dir;
scale = min_scale;
}
if(scale > max_scale)
{
scale_dir *= -1.f;
ofs_y_dir *= -1.f;
ofs_x_dir *= ofs_y_dir;
scale = max_scale;
}
offset_x += ofs_x_dir*t*scale/30;
offset_y += ofs_y_dir*t*scale/30;
gl.uniform(prog.offset_loc, offset_x, offset_y);
gl.uniform(prog.scale_loc, scale*aspect, scale);
}
}
void resize(const example_state_view& state)
override
{
gl.viewport(0, 0, state.width(), state.height());
erg.set_dimensions(state.width(), state.height());
aspect = state.aspect();
}
void pointer_scrolling(const example_state_view& state)
override
{
scale *= float(std::pow(2,-state.norm_delta_pointer_z()));
if(scale < min_scale) scale = min_scale;
if(scale > max_scale) scale = max_scale;
gl.uniform(erg.scale_loc, scale*aspect, scale);
}
void set_projection(const example_state_view& state)
{
auto projection =
matrix_perspective::y(
right_angle_(),
state.aspect(),
0.5f, 50.f
)*matrix_orbiting_y_up(
vec3(),
smooth_lerp(1.5f, 5.0f, cam_orbit),
turns_(cam_turns),
smooth_oscillate(radians_(1.5f), cam_pitch)
);
gl.use(light_prog);
gl.uniform(light_prog.projection, projection);
gl.use(erase_prog);
gl.uniform(erase_prog.projection, projection);
}
void pointer_motion(const example_state_view& state)
override
{
if(state.pointer_dragging())
{
offset_x -= 2*state.norm_delta_pointer_x()*scale;
offset_y -= 2*state.norm_delta_pointer_y()*scale;
gl.uniform(prog.offset_loc, offset_x, offset_y);
}
}
cube_example(
const example_state_view& state,
eagine::memory::buffer& temp_buffer
): prog()
, cube(
temp_buffer,
shapes::vertex_attrib_kind::position+
shapes::vertex_attrib_kind::normal+
shapes::vertex_attrib_kind::box_coord+
shapes::vertex_attrib_kind::face_coord
), cam_orbit(0.5)
, cam_turns(0.12f)
, cam_pitch(0.72f)
, cam_dist_dir(-1)
, cam_turn_dir(1)
, cam_elev_dir(1)
{
gl.clear_color(0.6f, 0.6f, 0.5f, 0);
gl.clear_depth(1);
gl.enable(GL.depth_test);
set_projection(state);
}
example_voronoi(const example_params& params)
: tex(params)
, prog(params)
, screen(prog)
, ofs_x_dir(1.f)
, ofs_y_dir(1.f)
, offset_x(-0.5f)
, offset_y(0.0f)
, scale_dir(1.f)
, scale(10.0f)
, aspect(1.0f)
{
gl.disable(GL.depth_test);
}
void user_idle(const example_state_view& state)
override
{
if(state.user_idle_time() > seconds_(1))
{
using namespace eagine::math;
float new_sc = float(smooth_lerp(
min_scale,
max_scale,
value(state.exec_time())*0.4f
));
scale = interpolate_linear(new_sc, scale, 0.9f);
gl.uniform(erg.scale_loc, scale, scale);
}
}
void user_idle(const example_state_view& state)
override
{
if(state.user_idle_time() > seconds_(1))
{
const float s = value(state.frame_duration())*60;
const float dest_offset_x = -0.525929f;
const float dest_offset_y = -0.668547f;
const float c = 0.02f * s;
offset_x = c*dest_offset_x + (1-c)*offset_x;
offset_y = c*dest_offset_y + (1-c)*offset_y;
scale *= (1-0.01f*s);
if(scale < min_scale) scale = min_scale;
gl.uniform(offset_loc, offset_x, offset_y);
gl.uniform(scale_loc, scale*aspect, scale);
}
}
example_recursive_cube(void)
: tex_side(512)
, rnd_tex(tex_side)
, cube(prog)
, current_buf(0)
, rad(0.0f)
{
gl.clear_color(0.8f, 0.8f, 0.8f, 0.0f);
gl.clear_depth(1.0f);
gl.enable(GL.depth_test);
gl.enable(GL.cull_face);
gl.cull_face(GL.back);
gl.front_face(GL.ccw);
}
void render(const example_state_view& state)
override
{
gl.use(erase_prog);
gl.disable(GL.depth_test);
background.use();
background.draw();
shp_turns += 0.1f*state.frame_duration().value();
gl.use(light_prog);
gl.uniform(
light_prog.modelview,
matrix_rotation_x(turns_(shp_turns)/1)*
matrix_rotation_y(turns_(shp_turns)/2)*
matrix_rotation_z(turns_(shp_turns)/3)
);
gl.clear(GL.depth_buffer_bit);
gl.enable(GL.depth_test);
shape.use();
shape.draw();
}
example_program(void)
{
shader vs(GL.vertex_shader);
vs.source(glsl_literal(
"#version 140\n"
"uniform mat4 Projection;"
"uniform mat4 Modelview;"
"uniform vec3 LightPos;"
"in vec4 Position;\n"
"in vec3 Normal;\n"
"in vec2 TexCoord;\n"
"out vec3 vertNormal;\n"
"out vec3 vertLightDir;\n"
"out vec2 vertTexCoord;\n"
"void main(void)\n"
"{\n"
" gl_Position = Modelview*Position;\n"
" vertNormal = mat3(Modelview)*Normal;\n"
" vertLightDir = LightPos - gl_Position.xyz;\n"
" vertTexCoord = TexCoord;\n"
" gl_Position = Projection*gl_Position;\n"
"}\n"
));
vs.compile();
vs.report_compile_error();
shader fs(GL.fragment_shader);
fs.source(glsl_literal(
"#version 140\n"
"uniform sampler2D CubeTex;"
"in vec3 vertNormal;\n"
"in vec3 vertLightDir;\n"
"in vec2 vertTexCoord;\n"
"out vec4 fragColor;\n"
"void main(void)\n"
"{\n"
" float d=0.3*dot(vertNormal, normalize(vertLightDir));\n"
" float i=0.6 + max(d, 0.0);\n"
" fragColor = texture(CubeTex, vertTexCoord)*i;\n"
"}\n"
));
fs.compile();
fs.report_compile_error();
attach(vs);
attach(fs);
link();
report_link_error();
gl.use(*this);
gl.query_location(projection, *this, "Projection");
gl.query_location(modelview, *this, "Modelview");
gl.query_location(light_pos, *this, "LightPos");
gl.query_location(cube_tex, *this, "CubeTex");
}
rendered_textures(GLsizei tex_side)
{
for(GLuint i=0; i<2u; ++i)
{
texture_name tex = texs[i];
gl.active_texture(GL.texture0+i);
gl.bind(GL.texture_2d, tex);
gl.texture_min_filter(GL.texture_2d, GL.linear);
gl.texture_mag_filter(GL.texture_2d, GL.linear);
gl.texture_image_2d(
GL.texture_2d,
0,
GL.rgb,
tex_side, tex_side,
0,
GL.rgb,
GL.unsigned_byte,
const_memory_block()
);
renderbuffer_name rbo = rbos[i];
gl.bind(GL.renderbuffer, rbo);
gl.renderbuffer_storage(
GL.renderbuffer,
GL.depth_component,
tex_side, tex_side
);
framebuffer_name fbo = fbos[i];
gl.bind(GL.draw_framebuffer, fbo);
gl.framebuffer_texture_2d(
GL.draw_framebuffer,
GL.color_attachment0,
GL.texture_2d,
tex, 0
);
gl.framebuffer_renderbuffer(
GL.draw_framebuffer,
GL.depth_attachment,
GL.renderbuffer,
rbo
);
gl.viewport(tex_side, tex_side);
gl.clear(GL.color_buffer_bit);
}
gl.bind(GL.draw_framebuffer, default_framebuffer);
gl.bind(GL.renderbuffer, no_renderbuffer);
}
namespace oglplus {
static constants GL;
static operations gl;
class example_program
: public program
{
public:
uniform_location projection, modelview, light_pos, cube_tex;
example_program(void)
{
shader vs(GL.vertex_shader);
vs.source(glsl_literal(
"#version 140\n"
"uniform mat4 Projection;"
"uniform mat4 Modelview;"
"uniform vec3 LightPos;"
"in vec4 Position;\n"
"in vec3 Normal;\n"
"in vec2 TexCoord;\n"
"out vec3 vertNormal;\n"
"out vec3 vertLightDir;\n"
"out vec2 vertTexCoord;\n"
"void main(void)\n"
"{\n"
" gl_Position = Modelview*Position;\n"
" vertNormal = mat3(Modelview)*Normal;\n"
" vertLightDir = LightPos - gl_Position.xyz;\n"
" vertTexCoord = TexCoord;\n"
" gl_Position = Projection*gl_Position;\n"
"}\n"
));
vs.compile();
vs.report_compile_error();
shader fs(GL.fragment_shader);
fs.source(glsl_literal(
"#version 140\n"
"uniform sampler2D CubeTex;"
"in vec3 vertNormal;\n"
"in vec3 vertLightDir;\n"
"in vec2 vertTexCoord;\n"
"out vec4 fragColor;\n"
"void main(void)\n"
"{\n"
" float d=0.3*dot(vertNormal, normalize(vertLightDir));\n"
" float i=0.6 + max(d, 0.0);\n"
" fragColor = texture(CubeTex, vertTexCoord)*i;\n"
"}\n"
));
fs.compile();
fs.report_compile_error();
attach(vs);
attach(fs);
link();
report_link_error();
gl.use(*this);
gl.query_location(projection, *this, "Projection");
gl.query_location(modelview, *this, "Modelview");
gl.query_location(light_pos, *this, "LightPos");
gl.query_location(cube_tex, *this, "CubeTex");
}
};
class cube_model
{
private:
buffer positions;
buffer normals;
buffer texcoords;
public:
vertex_array vao;
cube_model(const program& prog)
{
const GLfloat v[8][3] = {
{-0.5f, -0.5f, -0.5f},
{+0.5f, -0.5f, -0.5f},
{-0.5f, +0.5f, -0.5f},
{+0.5f, +0.5f, -0.5f},
{-0.5f, -0.5f, +0.5f},
{+0.5f, -0.5f, +0.5f},
{-0.5f, +0.5f, +0.5f},
{+0.5f, +0.5f, +0.5f}
};
const GLint f[6][2][3] = {
{{0, 4, 2}, {2, 4, 6}},
{{5, 1, 7}, {7, 1, 3}},
{{0, 1, 4}, {4, 1, 5}},
{{6, 7, 2}, {2, 7, 3}},
{{1, 0, 3}, {3, 0, 2}},
{{4, 5, 6}, {6, 5, 7}}
};
gl.bind(vao);
const GLuint vertex_count = 6 * 2 * 3;
// positions
GLfloat vertex_data[vertex_count * 3];
for(GLuint fi=0;fi!=6;++fi)
for(GLuint ti=0;ti!=2;++ti)
for(GLuint vi=0;vi!=3;++vi)
{
for(GLuint ci=0;ci!=3;++ci)
{
vertex_data[fi*2*3*3+ti*3*3+vi*3+ci] =
v[f[fi][ti][vi]][ci];
}
}
gl.bind(GL.array_buffer, positions);
gl.buffer_data(GL.array_buffer, vertex_data, GL.static_draw);
gl.vertex_array_attrib_pointer(
vertex_attrib_location(0),
3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(vertex_attrib_location(0));
vertex_attrib_location va_p;
gl.query_location(va_p, prog, "Position");
gl.vertex_array_attrib_pointer(
va_p, 3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_p);
// normals
const GLfloat n[6][3] = {
{-1.0f, 0.0f, 0.0f},
{ 1.0f, 0.0f, 0.0f},
{ 0.0f, -1.0f, 0.0f},
{ 0.0f, 1.0f, 0.0f},
{ 0.0f, 0.0f, -1.0f},
{ 0.0f, 0.0f, 1.0f}
};
for(GLuint fi=0;fi!=6;++fi)
for(GLuint vi=0;vi!=6;++vi)
{
for(GLuint ci=0;ci!=3;++ci)
{
vertex_data[(fi*6+vi)*3+ci] = n[fi][ci];
}
}
gl.bind(GL.array_buffer, normals);
gl.buffer_data(GL.array_buffer, vertex_data, GL.static_draw);
vertex_attrib_location va_n;
gl.query_location(va_n, prog, "Normal");
gl.vertex_array_attrib_pointer(
va_n, 3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_n);
// tex-coords
const GLfloat c[6][2] = {
{0.0f, 0.0f},
{1.0f, 0.0f},
{0.0f, 1.0f},
{0.0f, 1.0f},
{1.0f, 0.0f},
{1.0f, 1.0f}
};
for(GLuint fi=0;fi!=6;++fi)
{
for(GLuint vi=0;vi!=6;++vi)
{
for(GLuint ci=0;ci!=2;++ci)
{
vertex_data[(fi*6+vi)*2+ci] = c[vi][ci];
}
}
}
gl.bind(GL.array_buffer, texcoords);
gl.buffer_data(
GL.array_buffer,
buffer_data_spec{vertex_data, vertex_count * 2},
GL.static_draw
);
vertex_attrib_location va_c;
gl.query_location(va_c, prog, "TexCoord");
gl.vertex_array_attrib_pointer(
va_c, 2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_c);
}
};
class rendered_textures
{
public:
texture_array<2> texs;
renderbuffer_array<2> rbos;
framebuffer_array<2> fbos;
rendered_textures(GLsizei tex_side)
{
for(GLuint i=0; i<2u; ++i)
{
texture_name tex = texs[i];
gl.active_texture(GL.texture0+i);
gl.bind(GL.texture_2d, tex);
gl.texture_min_filter(GL.texture_2d, GL.linear);
gl.texture_mag_filter(GL.texture_2d, GL.linear);
gl.texture_image_2d(
GL.texture_2d,
0,
GL.rgb,
tex_side, tex_side,
0,
GL.rgb,
GL.unsigned_byte,
const_memory_block()
);
renderbuffer_name rbo = rbos[i];
gl.bind(GL.renderbuffer, rbo);
gl.renderbuffer_storage(
GL.renderbuffer,
GL.depth_component,
tex_side, tex_side
);
framebuffer_name fbo = fbos[i];
gl.bind(GL.draw_framebuffer, fbo);
gl.framebuffer_texture_2d(
GL.draw_framebuffer,
GL.color_attachment0,
GL.texture_2d,
tex, 0
);
gl.framebuffer_renderbuffer(
GL.draw_framebuffer,
GL.depth_attachment,
GL.renderbuffer,
rbo
);
gl.viewport(tex_side, tex_side);
gl.clear(GL.color_buffer_bit);
}
gl.bind(GL.draw_framebuffer, default_framebuffer);
gl.bind(GL.renderbuffer, no_renderbuffer);
}
};
class example_recursive_cube
: public example
{
private:
const GLsizei tex_side;
rendered_textures rnd_tex;
example_program prog;
cube_model cube;
unsigned current_buf;
radians_t<float> rad;
public:
example_recursive_cube(void)
: tex_side(512)
, rnd_tex(tex_side)
, cube(prog)
, current_buf(0)
, rad(0.0f)
{
gl.clear_color(0.8f, 0.8f, 0.8f, 0.0f);
gl.clear_depth(1.0f);
gl.enable(GL.depth_test);
gl.enable(GL.cull_face);
gl.cull_face(GL.back);
gl.front_face(GL.ccw);
}
void resize(const example_state_view& state)
override
{
gl.viewport(state.width(), state.height());
}
bool continue_running(const example_state_view& state)
override
{
return state.user_idle_time() < seconds_(20);
}
void render(const example_state_view& state)
override
{
rad += radians_(0.5f*state.frame_duration().value());
current_buf = (current_buf+1)%2;
gl.uniform(
prog.light_pos,
vec3(cos(rad)*4, sin(rad)*4, 8)
);
gl.uniform(
prog.modelview,
matrix_rotation_x(rad*1)*
matrix_rotation_y(rad*2)*
matrix_rotation_z(rad*3)
);
// draw into the texture
gl.bind(GL.draw_framebuffer, rnd_tex.fbos[current_buf]);
gl.viewport(tex_side, tex_side);
GLfloat s = 0.5f;
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-s,+s, -s,+s, 1.0f, 5)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
// draw on screen
gl.bind(GL.draw_framebuffer, default_framebuffer);
gl.viewport(state.width(), state.height());
gl.uniform(prog.cube_tex, GLint(current_buf));
GLfloat h = 0.55f;
GLfloat w = h*state.aspect();
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-w,+w, -h,+h, 1, 3)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
}
};
std::unique_ptr<example>
make_example(
const example_args&,
const example_params&,
const example_state_view&
)
{
return std::unique_ptr<example>(new example_recursive_cube());
}
void adjust_params(example_params& params)
{
params.depth_buffer(true);
params.stencil_buffer(false);
}
bool is_example_param(const example_arg&) { return false; }
} // namespace oglplus
cube_model(const program& prog)
{
const GLfloat v[8][3] = {
{-0.5f, -0.5f, -0.5f},
{+0.5f, -0.5f, -0.5f},
{-0.5f, +0.5f, -0.5f},
{+0.5f, +0.5f, -0.5f},
{-0.5f, -0.5f, +0.5f},
{+0.5f, -0.5f, +0.5f},
{-0.5f, +0.5f, +0.5f},
{+0.5f, +0.5f, +0.5f}
};
const GLint f[6][2][3] = {
{{0, 4, 2}, {2, 4, 6}},
{{5, 1, 7}, {7, 1, 3}},
{{0, 1, 4}, {4, 1, 5}},
{{6, 7, 2}, {2, 7, 3}},
{{1, 0, 3}, {3, 0, 2}},
{{4, 5, 6}, {6, 5, 7}}
};
gl.bind(vao);
const GLuint vertex_count = 6 * 2 * 3;
// positions
GLfloat vertex_data[vertex_count * 3];
for(GLuint fi=0;fi!=6;++fi)
for(GLuint ti=0;ti!=2;++ti)
for(GLuint vi=0;vi!=3;++vi)
{
for(GLuint ci=0;ci!=3;++ci)
{
vertex_data[fi*2*3*3+ti*3*3+vi*3+ci] =
v[f[fi][ti][vi]][ci];
}
}
gl.bind(GL.array_buffer, positions);
gl.buffer_data(GL.array_buffer, vertex_data, GL.static_draw);
gl.vertex_array_attrib_pointer(
vertex_attrib_location(0),
3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(vertex_attrib_location(0));
vertex_attrib_location va_p;
gl.query_location(va_p, prog, "Position");
gl.vertex_array_attrib_pointer(
va_p, 3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_p);
// normals
const GLfloat n[6][3] = {
{-1.0f, 0.0f, 0.0f},
{ 1.0f, 0.0f, 0.0f},
{ 0.0f, -1.0f, 0.0f},
{ 0.0f, 1.0f, 0.0f},
{ 0.0f, 0.0f, -1.0f},
{ 0.0f, 0.0f, 1.0f}
};
for(GLuint fi=0;fi!=6;++fi)
for(GLuint vi=0;vi!=6;++vi)
{
for(GLuint ci=0;ci!=3;++ci)
{
vertex_data[(fi*6+vi)*3+ci] = n[fi][ci];
}
}
gl.bind(GL.array_buffer, normals);
gl.buffer_data(GL.array_buffer, vertex_data, GL.static_draw);
vertex_attrib_location va_n;
gl.query_location(va_n, prog, "Normal");
gl.vertex_array_attrib_pointer(
va_n, 3, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_n);
// tex-coords
const GLfloat c[6][2] = {
{0.0f, 0.0f},
{1.0f, 0.0f},
{0.0f, 1.0f},
{0.0f, 1.0f},
{1.0f, 0.0f},
{1.0f, 1.0f}
};
for(GLuint fi=0;fi!=6;++fi)
{
for(GLuint vi=0;vi!=6;++vi)
{
for(GLuint ci=0;ci!=2;++ci)
{
vertex_data[(fi*6+vi)*2+ci] = c[vi][ci];
}
}
}
gl.bind(GL.array_buffer, texcoords);
gl.buffer_data(
GL.array_buffer,
buffer_data_spec{vertex_data, vertex_count * 2},
GL.static_draw
);
vertex_attrib_location va_c;
gl.query_location(va_c, prog, "TexCoord");
gl.vertex_array_attrib_pointer(
va_c, 2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_c);
}
namespace oglplus {
static constants GL;
static operations gl;
class erase_program
: public program
{
private:
program_source_file
_get_source(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::program_source,
cstr_ref("028_lighting-bg.oglpprog")
);
return program_source_file(cstr_ref(path));
}
public:
uniform_location projection;
erase_program(const example_params& params)
: program(build_program(_get_source(params)))
{
gl.use(*this);
gl.query_location(projection, *this, "Projection");
}
};
class lighting_program
: public program
{
public:
uniform_location projection, modelview;
lighting_program(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::program_source,
cstr_ref("028_lighting-lt.oglpprog")
);
build_program(*this, program_source_file(cstr_ref(path)));
gl.use(*this);
gl.query_location(projection, *this, "Projection");
gl.query_location(modelview, *this, "Modelview");
}
};
class lighting_example
: public example
{
private:
erase_program erase_prog;
lighting_program light_prog;
shapes::generator_wrapper<shapes::unit_sphere_gen, 1> background;
shapes::generator_wrapper<shapes::unit_torus_gen, 3> shape;
float shp_turns;
float cam_orbit;
float cam_turns;
float cam_pitch;
short cam_dist_dir;
short cam_turn_dir;
short cam_elev_dir;
void mod_bouncing(short& dir, float& val, float inc)
{
val += inc;
if(val > 1.f)
{
val = 1.f;
dir = -1;
}
if(val < 0.f)
{
val = 0.f;
dir = +1;
}
}
void mod_cam_orbit(float inc)
{
mod_bouncing(cam_dist_dir, cam_orbit, inc);
}
void mod_cam_turns(float inc)
{
cam_turns += inc;
cam_turn_dir = (inc > 0)?1:-1;
}
void mod_cam_pitch(float inc)
{
mod_bouncing(cam_elev_dir, cam_pitch, inc);
}
void set_projection(const example_state_view& state)
{
auto projection =
matrix_perspective::y(
right_angle_(),
state.aspect(),
0.5f, 50.f
)*matrix_orbiting_y_up(
vec3(),
smooth_lerp(1.5f, 5.0f, cam_orbit),
turns_(cam_turns),
smooth_oscillate(radians_(1.5f), cam_pitch)
);
gl.use(light_prog);
gl.uniform(light_prog.projection, projection);
gl.use(erase_prog);
gl.uniform(erase_prog.projection, projection);
}
public:
lighting_example(
const example_params& params,
const example_state_view& state,
eagine::memory::buffer& temp_buffer
): erase_prog(params)
, light_prog(params)
, background(
temp_buffer,
(shapes::vertex_attrib_kind::position |0),
36, 72
), shape(
temp_buffer,
(shapes::vertex_attrib_kind::position |0)+
(shapes::vertex_attrib_kind::normal |1)+
(shapes::vertex_attrib_kind::wrap_coord|2),
96, 144
), shp_turns(0.0f)
, cam_orbit(0.0f)
, cam_turns(0.0f)
, cam_pitch(0.5f)
, cam_dist_dir(-1)
, cam_turn_dir(1)
, cam_elev_dir(1)
{
gl.clear_depth(1);
gl.disable(GL.cull_face);
set_projection(state);
}
void pointer_motion(const example_state_view& state)
override
{
if(state.pointer_dragging())
{
mod_cam_turns(-state.norm_delta_pointer_x()*0.5f);
mod_cam_pitch(-state.norm_delta_pointer_y()*1.0f);
set_projection(state);
}
}
void pointer_scrolling(const example_state_view& state)
override
{
mod_cam_orbit(-state.norm_delta_pointer_z());
set_projection(state);
}
void resize(const example_state_view& state)
override
{
gl.viewport(state.width(), state.height());
set_projection(state);
}
void user_idle(const example_state_view& state)
override
{
if(state.user_idle_time() > seconds_(1))
{
const float s = state.frame_duration().value()/5;
mod_cam_orbit(s*cam_dist_dir);
mod_cam_turns(s*cam_turn_dir);
mod_cam_pitch(s*cam_elev_dir);
set_projection(state);
}
}
void render(const example_state_view& state)
override
{
gl.use(erase_prog);
gl.disable(GL.depth_test);
background.use();
background.draw();
shp_turns += 0.1f*state.frame_duration().value();
gl.use(light_prog);
gl.uniform(
light_prog.modelview,
matrix_rotation_x(turns_(shp_turns)/1)*
matrix_rotation_y(turns_(shp_turns)/2)*
matrix_rotation_z(turns_(shp_turns)/3)
);
gl.clear(GL.depth_buffer_bit);
gl.enable(GL.depth_test);
shape.use();
shape.draw();
}
bool continue_running(const example_state_view& state)
override
{
return state.user_idle_time() < seconds_(20);
}
};
std::unique_ptr<example>
make_example(
const example_args&,
const example_params& params,
const example_state_view& state
)
{
eagine::memory::buffer temp_buffer;
return std::unique_ptr<example>(new lighting_example(
params,
state,
temp_buffer
));
}
void adjust_params(example_params& params)
{
params.depth_buffer(true);
params.stencil_buffer(false);
}
bool is_example_param(const example_arg&) { return false; }
} // namespace oglplus
erase_program(const example_params& params)
: program(build_program(_get_source(params)))
{
gl.use(*this);
gl.query_location(projection, *this, "Projection");
}
screen_shape(const program& prog)
{
gl.bind(vao);
GLfloat position_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, positions);
gl.buffer_data(GL.array_buffer, position_data, GL.static_draw);
vertex_attrib_location va_p;
gl.query_location(va_p, prog, "Position");
gl.vertex_array_attrib_pointer(
va_p,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_p);
GLfloat coord_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, coords);
gl.buffer_data(GL.array_buffer, coord_data, GL.static_draw);
vertex_attrib_location va_c;
gl.query_location(va_c, prog, "TexCoord");
gl.vertex_array_attrib_pointer(
va_c,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_c);
}
example_mandelbrot(void)
: offset_x(-0.5f)
, offset_y(0.0f)
, scale(1.0f)
, aspect(1.0f)
{
shader vs(GL.vertex_shader);
vs.source(glsl_literal(
"#version 130\n"
"uniform vec2 Offset;\n"
"uniform vec2 Scale;\n"
"in vec2 Position;\n"
"in vec2 Coord;\n"
"out vec2 vertCoord;\n"
"void main(void)\n"
"{\n"
" vertCoord = Coord*Scale+Offset;\n"
" gl_Position = vec4(Position, 0.0, 1.0);\n"
"}\n"
));
vs.compile();
shader fs(GL.fragment_shader);
fs.source(glsl_literal(
"#version 130\n"
"uniform sampler1D gradient;\n"
"in vec2 vertCoord;\n"
"out vec4 fragColor;\n"
"void main(void)\n"
"{\n"
" vec2 z = vec2(0.0, 0.0);\n"
" vec2 c = vertCoord;\n"
" int i = 0, max = 256;\n"
" while((i != max) && (distance(z, c) < 2.0))\n"
" {\n"
" vec2 zn = vec2(\n"
" z.x * z.x - z.y * z.y + c.x,\n"
" 2.0 * z.x * z.y + c.y\n"
" );\n"
" z = zn;\n"
" ++i;\n"
" }\n"
" float a = float(i)/float(max);\n"
" fragColor = texture(gradient, a+sqrt(length(c))*0.1);\n"
"} \n"
));
fs.compile();
prog.attach(vs);
prog.attach(fs);
prog.link();
gl.use(prog);
gl.query_location(offset_loc, prog, "Offset");
gl.query_location(scale_loc, prog, "Scale");
gl.uniform(offset_loc, offset_x, offset_y);
gl.bind(vao);
GLfloat position_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, positions);
gl.buffer_data(GL.array_buffer, position_data, GL.static_draw);
vertex_attrib_location va_p;
gl.query_location(va_p, prog, "Position");
gl.vertex_array_attrib_pointer(
va_p,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_p);
GLfloat coord_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, coords);
gl.buffer_data(GL.array_buffer, coord_data, GL.static_draw);
vertex_attrib_location va_c;
gl.query_location(va_c, prog, "Coord");
gl.vertex_array_attrib_pointer(
va_c,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_c);
GLfloat gradient_data[8*3];
for(int i=0; i<8*3; ++i)
{
gradient_data[i] = (std::rand() % 10000) / 10000.f;
}
gl.bind(GL.texture_1d, gradient);
gl.texture_min_filter(GL.texture_1d, GL.linear);
gl.texture_mag_filter(GL.texture_1d, GL.linear);
gl.texture_wrap(
GL.texture_1d,
GL.texture_wrap_s,
GL.repeat
);
gl.texture_image_1d(
GL.texture_1d,
0, GL.rgb,
8,
0, GL.rgb,
GL.float_,
const_memory_block{gradient_data}
);
gl.disable(GL.depth_test);
}
void resize(const example_state_view& state)
override
{
gl.viewport(state.width(), state.height());
}
namespace oglplus {
static constants GL;
static operations gl;
class voronoi_program
: public program
{
private:
void _init(const program_source_file& prog_src)
{
for(span_size_t i=0, n=prog_src.shader_source_count(); i<n; ++i)
{
shader shdr(prog_src.shader_type(i));
shdr.source(prog_src.shader_source(i));
shdr.compile();
shdr.report_compile_error();
attach(shdr);
}
link();
report_link_error();
}
public:
uniform<GLfloat> offset_loc;
uniform<GLfloat> scale_loc;
voronoi_program(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::program_source,
cstr_ref("014_voronoi.oglpprog")
);
_init(program_source_file(cstr_ref(path)));
gl.use(*this);
gl.query_location(offset_loc, *this, "Offset");
gl.query_location(scale_loc, *this, "Scale");
}
};
class random_texture
: public texture
{
private:
void init(const texture_image_file& image_data)
{
gl.bind(GL.texture_2d, *this);
gl.texture_min_filter(GL.texture_2d, GL.nearest);
gl.texture_mag_filter(GL.texture_2d, GL.nearest);
gl.texture_wrap(
GL.texture_2d,
GL.texture_wrap_s,
GL.repeat
);
gl.texture_image_2d(GL.texture_2d, image_data.spec());
}
public:
random_texture(const example_params& params)
{
std::string path = params.get_resource_file_path(
example_resource_type::texture,
cstr_ref("noise.256x256x3.oglptex")
);
init(texture_image_file(cstr_ref(path)));
}
};
class screen_shape
{
private:
buffer positions;
buffer coords;
public:
vertex_array vao;
screen_shape(const program& prog)
{
gl.bind(vao);
GLfloat position_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, positions);
gl.buffer_data(GL.array_buffer, position_data, GL.static_draw);
vertex_attrib_location va_p;
gl.query_location(va_p, prog, "Position");
gl.vertex_array_attrib_pointer(
va_p,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_p);
GLfloat coord_data[4*2] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
gl.bind(GL.array_buffer, coords);
gl.buffer_data(GL.array_buffer, coord_data, GL.static_draw);
vertex_attrib_location va_c;
gl.query_location(va_c, prog, "TexCoord");
gl.vertex_array_attrib_pointer(
va_c,
2, GL.float_,
false, 0, nullptr
);
gl.enable_vertex_array_attrib(va_c);
}
};
class example_voronoi
: public example
{
private:
random_texture tex;
voronoi_program prog;
screen_shape screen;
GLfloat ofs_x_dir, ofs_y_dir, offset_x, offset_y;
GLfloat scale_dir, scale, aspect;
static constexpr const float min_scale = 1.0f;
static constexpr const float max_scale = 100.0f;
public:
example_voronoi(const example_params& params)
: tex(params)
, prog(params)
, screen(prog)
, ofs_x_dir(1.f)
, ofs_y_dir(1.f)
, offset_x(-0.5f)
, offset_y(0.0f)
, scale_dir(1.f)
, scale(10.0f)
, aspect(1.0f)
{
gl.disable(GL.depth_test);
}
void pointer_motion(const example_state_view& state)
override
{
if(state.pointer_dragging())
{
offset_x -= 2*state.norm_delta_pointer_x()*scale;
offset_y -= 2*state.norm_delta_pointer_y()*scale;
gl.uniform(prog.offset_loc, offset_x, offset_y);
}
}
void pointer_scrolling(const example_state_view& state)
override
{
scale *= float(std::pow(2,-state.norm_delta_pointer_z()));
if(scale < min_scale) scale = min_scale;
if(scale > max_scale) scale = max_scale;
gl.uniform(prog.scale_loc, scale*aspect, scale);
}
void resize(const example_state_view& state)
override
{
gl.viewport(state.width(), state.height());
aspect = state.aspect();
gl.uniform(prog.scale_loc, scale*aspect, scale);
}
void user_idle(const example_state_view& state)
override
{
if(state.user_idle_time() > seconds_(1))
{
const float t = value(state.frame_duration())*60;
scale *= std::pow(1.f+0.05f*t, scale_dir);
if(scale < min_scale)
{
scale_dir *= -1.f;
ofs_x_dir *= -1.f;
ofs_y_dir *= ofs_x_dir;
scale = min_scale;
}
if(scale > max_scale)
{
scale_dir *= -1.f;
ofs_y_dir *= -1.f;
ofs_x_dir *= ofs_y_dir;
scale = max_scale;
}
offset_x += ofs_x_dir*t*scale/30;
offset_y += ofs_y_dir*t*scale/30;
gl.uniform(prog.offset_loc, offset_x, offset_y);
gl.uniform(prog.scale_loc, scale*aspect, scale);
}
}
bool continue_running(const example_state_view& state)
override
{
return state.user_idle_time() < seconds_(20);
}
void render(const example_state_view& /*state*/)
override
{
gl.draw_arrays(GL.triangle_strip, 0, 4);
}
};
std::unique_ptr<example>
make_example(
const example_args&,
const example_params& params,
const example_state_view&
)
{
return std::unique_ptr<example>(new example_voronoi(params));
}
void adjust_params(example_params& params)
{
params.rand_seed(1234);
params.depth_buffer(false);
params.stencil_buffer(false);
}
bool is_example_param(const example_arg&) { return false; }
} // namespace oglplus
void render(const example_state_view& state)
override
{
rad += radians_(0.5f*state.frame_duration().value());
current_buf = (current_buf+1)%2;
gl.uniform(
prog.light_pos,
vec3(cos(rad)*4, sin(rad)*4, 8)
);
gl.uniform(
prog.modelview,
matrix_rotation_x(rad*1)*
matrix_rotation_y(rad*2)*
matrix_rotation_z(rad*3)
);
// draw into the texture
gl.bind(GL.draw_framebuffer, rnd_tex.fbos[current_buf]);
gl.viewport(tex_side, tex_side);
GLfloat s = 0.5f;
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-s,+s, -s,+s, 1.0f, 5)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
// draw on screen
gl.bind(GL.draw_framebuffer, default_framebuffer);
gl.viewport(state.width(), state.height());
gl.uniform(prog.cube_tex, GLint(current_buf));
GLfloat h = 0.55f;
GLfloat w = h*state.aspect();
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-w,+w, -h,+h, 1, 3)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
}
void render(const example_state_view& /*state*/)
override
{
gl.draw_arrays(GL.triangle_strip, 0, 4);
}