628 lines
16 KiB
C++
628 lines
16 KiB
C++
#include <psemek/gfx/renderer/deferred.hpp>
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#include <psemek/gfx/program.hpp>
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#include <psemek/gfx/framebuffer.hpp>
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#include <psemek/gfx/texture.hpp>
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#include <psemek/gfx/mesh.hpp>
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#include <psemek/gfx/error.hpp>
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#include <psemek/geom/homogeneous.hpp>
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#include <psemek/cg/convex_hull_2d/graham.hpp>
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namespace psemek::gfx
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{
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char const g_buffer_pass_common[] =
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R"(#version 330
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const uint O_UNIFORM_COLOR = 1u << 0;
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const uint O_TEXTURE_COLOR = 1u << 1;
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const uint O_TRANSPARENT = 1u << 2;
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const uint O_LIT = 1u << 3;
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const uint O_CASTS_SHADOW = 1u << 4;
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const uint O_PRE_TRANSFORM = 1u << 5;
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const uint O_POST_TRANSFORM = 1u << 6;
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const uint O_INSTANCED = 1u << 7;
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uniform uint u_flag_mask;
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)";
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char const g_buffer_pass_vs[] =
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R"(
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uniform mat4 u_camera_transform;
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uniform mat4x3 u_pre_transform;
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uniform mat4x3 u_post_transform;
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layout (location = 0) in vec4 in_position;
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layout (location = 1) in vec4 in_color;
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layout (location = 2) in vec2 in_texcoord;
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layout (location = 3) in vec3 in_normal;
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layout (location = 4) in mat3x4 in_instance_transform;
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out vec3 position;
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out vec4 color;
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out vec2 texcoord;
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out vec3 normal;
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void main()
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{
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vec4 pos = in_position;
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vec3 n = in_normal;
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if ((u_flag_mask & O_PRE_TRANSFORM) != 0u)
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{
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pos = vec4(u_pre_transform * pos, 1.0);
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n = u_pre_transform * vec4(n, 0.0);
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}
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if ((u_flag_mask & O_INSTANCED) != 0u)
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{
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pos = vec4(transpose(in_instance_transform) * pos, 1.0);
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n = transpose(in_instance_transform) * vec4(n, 0.0);
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}
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if ((u_flag_mask & O_POST_TRANSFORM) != 0u)
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{
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pos = vec4(u_post_transform * pos, 1.0);
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n = u_post_transform * vec4(n, 0.0);
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}
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position = pos.xyz;
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gl_Position = u_camera_transform * pos;
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color = in_color;
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texcoord = in_texcoord;
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normal = n;
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}
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)";
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char const g_buffer_pass_fs[] =
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R"(
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uniform vec4 u_color;
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uniform sampler2D u_texture;
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uniform vec3 u_material;
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uniform float u_max_intensity;
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in vec3 position;
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in vec4 color;
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in vec2 texcoord;
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in vec3 normal;
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layout (location = 0) out vec3 out0;
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layout (location = 1) out vec4 out1;
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layout (location = 2) out vec3 out2;
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layout (location = 3) out vec3 out3;
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void main()
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{
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vec4 albedo;
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if ((u_flag_mask & O_TEXTURE_COLOR) != 0u)
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{
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vec4 base_color = texture(u_texture, texcoord);
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if ((u_flag_mask & O_UNIFORM_COLOR) != 0u)
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albedo = u_color * base_color;
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else
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albedo = base_color;
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}
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else
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{
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if ((u_flag_mask & O_UNIFORM_COLOR) != 0u)
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albedo = u_color;
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else
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albedo = color;
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}
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out0 = position;
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out1 = vec4(albedo.rgb / u_max_intensity, (u_flag_mask & O_LIT) != 0u ? 1.f : 0.f);
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out2 = normalize(normal) * 0.5 + vec3(0.5);
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out3 = u_material;
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}
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)";
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char const fullscreen_vs[] =
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R"(#version 330
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const vec4 vertices[6] = vec4[6](
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vec4(-1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, 1.0, 0.0, 1.0),
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vec4(-1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, 1.0, 0.0, 1.0),
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vec4(-1.0, 1.0, 0.0, 1.0)
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);
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out vec2 texcoord;
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void main()
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{
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gl_Position = vertices[gl_VertexID];
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texcoord = vertices[gl_VertexID].xy * 0.5 + vec2(0.5);
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}
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)";
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char const screen_vs[] =
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R"(#version 330
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layout (location = 0) in vec2 in_position;
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out vec2 texcoord;
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void main()
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{
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gl_Position = vec4(in_position, 0.0, 1.0);
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texcoord = in_position * 0.5 + vec2(0.5);
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}
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)";
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char const ambient_pass_fs[] =
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R"(#version 330
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uniform sampler2D u_g0;
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uniform sampler2D u_g1;
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uniform sampler2D u_g2;
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uniform sampler2D u_g3;
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uniform vec3 u_ambient;
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uniform float u_max_intensity;
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in vec2 texcoord;
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out vec4 out_color;
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void main()
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{
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vec4 albedo = texture(u_g1, texcoord);
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vec3 color;
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if (albedo.a < 0.5)
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color = albedo.rgb;
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else
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color = albedo.rgb * u_ambient;
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out_color = vec4(color, 1.0);
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}
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)";
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char const directional_light_pass_fs[] =
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R"(#version 330
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uniform sampler2D u_g0;
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uniform sampler2D u_g1;
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uniform sampler2D u_g2;
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uniform sampler2D u_g3;
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uniform vec3 u_light_direction;
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uniform vec3 u_light_color;
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uniform vec3 u_camera_position;
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uniform float u_max_intensity;
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in vec2 texcoord;
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out vec4 out_color;
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void main()
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{
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vec3 position = texture(u_g0, texcoord).xyz;
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vec4 albedo = texture(u_g1, texcoord);
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vec3 normal = texture(u_g2, texcoord).xyz * 2.0 - vec3(1.0);
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vec3 material = texture(u_g3, texcoord).xyz;
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vec3 view = normalize(u_camera_position - position);
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float d = dot(u_light_direction, normal);
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vec3 refl = 2.0 * normal * d - u_light_direction;
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float l = max(0.0, d) * material.x + pow(max(0.0, dot(view, refl)), material.z) * material.y;
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vec3 color = l * albedo.rgb * u_light_color * albedo.a;
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out_color = vec4(color, 1.0);
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}
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)";
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char const point_light_pass_fs[] =
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R"(#version 330
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uniform sampler2D u_g0;
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uniform sampler2D u_g1;
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uniform sampler2D u_g2;
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uniform sampler2D u_g3;
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uniform vec3 u_light_position;
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uniform vec3 u_light_color;
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uniform vec3 u_light_attenuation;
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uniform vec3 u_camera_position;
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uniform float u_max_intensity;
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in vec2 texcoord;
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out vec4 out_color;
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void main()
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{
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vec3 position = texture(u_g0, texcoord).xyz;
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vec4 albedo = texture(u_g1, texcoord);
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vec3 normal = texture(u_g2, texcoord).xyz * 2.0 - vec3(1.0);
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vec3 material = texture(u_g3, texcoord).xyz;
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vec3 view = normalize(u_camera_position - position);
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vec3 light = u_light_position - position;
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float r = length(light);
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light /= r;
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float d = dot(light, normal);
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vec3 refl = 2.0 * normal * d - light;
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float l = max(0.0, d) * material.x + pow(max(0.0, dot(view, refl)), material.z) * material.y;
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vec3 color = l * albedo.rgb * u_light_color * albedo.a / (u_light_attenuation.x + r * (u_light_attenuation.y + r * u_light_attenuation.z));
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out_color = vec4(color, 1.0);
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}
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)";
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static std::size_t bbox_to_screen_fan(geom::matrix<float, 4, 4> const & camera_transform, geom::box<float, 3> const & b, geom::point<float, 2> * result)
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{
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geom::point<float, 2> bbox_corners_screen[8];
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auto bbox_corners_screen_end = bbox_corners_screen;
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bool need_clipping = false;
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for (int z = 0; z < 2; ++z)
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{
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for (int y = 0; y < 2; ++y)
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{
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for (int x = 0; x < 2; ++x)
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{
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geom::point<float, 3> p;
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p[0] = geom::lerp<float>(b[0], x);
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p[1] = geom::lerp<float>(b[1], y);
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p[2] = geom::lerp<float>(b[2], z);
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auto q = camera_transform * geom::homogeneous(p);
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if (q[2] < -q[3] || q[2] > q[3])
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{
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need_clipping = true;
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break;
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}
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*bbox_corners_screen_end++ = {q[0] / q[3], q[1] / q[3]};
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}
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}
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}
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if (need_clipping)
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{
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// TODO: clip with near-Z manually instead of filling the entire screen
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*result++ = {-1.f, -1.f};
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*result++ = { 1.f, -1.f};
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*result++ = { 1.f, 1.f};
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*result++ = {-1.f, 1.f};
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return 4;
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}
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geom::point<float, 2> * bbox_hull_screen_it[8];
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auto bbox_hull_size = cg::graham_convex_hull(bbox_corners_screen, bbox_corners_screen_end, bbox_hull_screen_it) - bbox_hull_screen_it;
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for (std::size_t i = 0; i < bbox_hull_size; ++i)
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result[i] = *bbox_hull_screen_it[i];
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return bbox_hull_size;
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}
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struct deferred_renderer::impl
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{
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gfx::program g_buffer_pass_program{std::string(g_buffer_pass_common) + g_buffer_pass_vs, std::string(g_buffer_pass_common) + g_buffer_pass_fs};
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gfx::program ambient_pass_program{fullscreen_vs, ambient_pass_fs};
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gfx::program directional_light_pass_program{screen_vs, directional_light_pass_fs};
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gfx::program point_light_pass_program{screen_vs, point_light_pass_fs};
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// G-buffer attachments:
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// 0 - position (rbg)
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// 1 - albedo (rgb), lit (a)
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// 2 - normal (rgb)
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// 3 - material.diffuse (r), material.specular (g), material.shininess (b)
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gfx::framebuffer g_framebuffer;
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gfx::texture_2d g_buffer_texture[4];
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gfx::texture_2d g_buffer_depth;
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std::optional<geom::vector<std::size_t, 2>> g_buffer_size;
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gfx::mesh screen_mesh;
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};
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deferred_renderer::deferred_renderer()
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: pimpl_{std::make_unique<struct impl>()}
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{
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impl().g_buffer_pass_program.bind();
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impl().g_buffer_pass_program["u_texture"] = 0;
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for (std::size_t i = 0; i < 4; ++i)
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{
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impl().g_buffer_texture[i].nearest_filter();
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}
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impl().ambient_pass_program.bind();
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impl().ambient_pass_program["u_g0"] = 0;
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impl().ambient_pass_program["u_g1"] = 1;
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impl().ambient_pass_program["u_g2"] = 2;
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impl().ambient_pass_program["u_g3"] = 3;
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impl().directional_light_pass_program.bind();
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impl().directional_light_pass_program["u_g0"] = 0;
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impl().directional_light_pass_program["u_g1"] = 1;
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impl().directional_light_pass_program["u_g2"] = 2;
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impl().directional_light_pass_program["u_g3"] = 3;
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impl().point_light_pass_program.bind();
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impl().point_light_pass_program["u_g0"] = 0;
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impl().point_light_pass_program["u_g1"] = 1;
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impl().point_light_pass_program["u_g2"] = 2;
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impl().point_light_pass_program["u_g3"] = 3;
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impl().screen_mesh.setup<geom::point<float, 2>>();
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}
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deferred_renderer::~deferred_renderer() = default;
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static std::uint32_t const O_UNIFORM_COLOR = 1 << 0;
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static std::uint32_t const O_TEXTURE_COLOR = 1 << 1;
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static std::uint32_t const O_TRANSPARENT = 1 << 2;
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static std::uint32_t const O_LIT = 1 << 3;
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static std::uint32_t const O_CASTS_SHADOW = 1 << 4;
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static std::uint32_t const O_PRE_TRANSFORM = 1 << 5;
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static std::uint32_t const O_POST_TRANSFORM = 1 << 6;
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static std::uint32_t const O_INSTANCED = 1 << 7;
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std::uint32_t mask(deferred_renderer::object const & o)
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{
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std::uint32_t m = 0;
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if (o.mat.color) m |= O_UNIFORM_COLOR;
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if (o.mat.texture) m |= O_TEXTURE_COLOR;
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if (o.mat.transparent) m |= O_TRANSPARENT;
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if (o.mat.lit) m |= O_LIT;
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if (o.casts_shadow) m |= O_CASTS_SHADOW;
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if (o.pre_transform) m |= O_PRE_TRANSFORM;
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if (o.post_transform) m |= O_POST_TRANSFORM;
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if (o.mesh->is_instanced()) m |= O_INSTANCED;
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return m;
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}
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void deferred_renderer::render(std::vector<object> const & objects, options const & opts)
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{
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// Get camera info
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assert(opts.camera);
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auto const camera_transform = opts.camera->transform();
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auto const camera_position = opts.camera->position();
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// Sort objects by mask & compute bbox
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std::unordered_map<std::uint32_t, std::vector<std::size_t>> objects_by_mask;
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geom::box<float, 3> lit_bbox;
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for (std::size_t i = 0; i < objects.size(); ++i)
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{
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auto const & o = objects[i];
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assert(o.mesh);
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if (o.mat.transparent) throw std::runtime_error("Transparency is not supported yet");
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objects_by_mask[mask(objects[i])].push_back(i);
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if (o.mat.lit) lit_bbox |= o.bbox;
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}
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// TODO: frustum culling
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// Resize g-buffer if needed
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auto buffer_size = geom::cast<std::size_t>(opts.viewport.dimensions());
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if (!impl().g_buffer_size || *impl().g_buffer_size != buffer_size)
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{
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// TODO: compact normals storage
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impl().g_buffer_texture[0].load<geom::vector<gfx::float16, 3>>(buffer_size);
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impl().g_buffer_texture[1].load<geom::vector<std::uint16_t, 4>>(buffer_size);
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impl().g_buffer_texture[2].load<geom::vector<gfx::float16, 3>>(buffer_size);
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impl().g_buffer_texture[3].load<geom::vector<gfx::float16, 3>>(buffer_size);
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impl().g_buffer_depth.load<gfx::depth24_pixel>(buffer_size);
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if (!impl().g_buffer_size)
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{
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for (std::size_t i = 0; i < 4; ++i)
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{
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impl().g_framebuffer.color(impl().g_buffer_texture[i], i);
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}
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impl().g_framebuffer.depth(impl().g_buffer_depth);
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}
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impl().g_framebuffer.assert_complete();
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impl().g_buffer_size = buffer_size;
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}
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// Setup g-buffer
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impl().g_framebuffer.bind();
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gl::Viewport(0, 0, opts.viewport[0].length(), opts.viewport[1].length());
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GLenum draw_buffers[4] { gl::COLOR_ATTACHMENT0, gl::COLOR_ATTACHMENT1, gl::COLOR_ATTACHMENT2, gl::COLOR_ATTACHMENT3 };
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gl::DrawBuffers(4, draw_buffers);
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check_error();
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float buffer_1_clear[4] { 0.f, 0.f, 0.f, 0.f };
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if (opts.clear_color)
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{
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buffer_1_clear[0] = (*opts.clear_color)[0] / opts.max_intensity;
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buffer_1_clear[1] = (*opts.clear_color)[1] / opts.max_intensity;
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buffer_1_clear[2] = (*opts.clear_color)[2] / opts.max_intensity;
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}
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gl::ClearBufferfv(gl::COLOR, 1, buffer_1_clear);
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gl::ClearDepth(1.f);
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gl::Clear(gl::DEPTH_BUFFER_BIT);
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gl::Enable(gl::DEPTH_TEST);
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gl::DepthFunc(gl::LEQUAL);
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gl::Disable(gl::BLEND);
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gl::Enable(gl::CULL_FACE);
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gl::CullFace(gl::BACK);
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// Render to g-buffer
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impl().g_buffer_pass_program.bind();
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impl().g_buffer_pass_program["u_camera_transform"] = camera_transform;
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impl().g_buffer_pass_program["u_max_intensity"] = opts.max_intensity;
|
|
|
|
for (auto const & p : objects_by_mask)
|
|
{
|
|
if (p.second.empty()) continue;
|
|
|
|
std::uint32_t mask = p.first;
|
|
|
|
impl().g_buffer_pass_program["u_flag_mask"] = mask;
|
|
|
|
for (std::size_t i : p.second)
|
|
{
|
|
auto const & o = objects[i];
|
|
|
|
if (mask & O_UNIFORM_COLOR)
|
|
impl().g_buffer_pass_program["u_color"] = *o.mat.color;
|
|
|
|
if (mask & O_TEXTURE_COLOR)
|
|
{
|
|
gl::ActiveTexture(gl::TEXTURE0);
|
|
o.mat.texture->bind();
|
|
}
|
|
|
|
if (mask & O_PRE_TRANSFORM)
|
|
impl().g_buffer_pass_program["u_pre_transform"] = *o.pre_transform;
|
|
|
|
if (mask & O_POST_TRANSFORM)
|
|
impl().g_buffer_pass_program["u_post_transform"] = *o.post_transform;
|
|
|
|
impl().g_buffer_pass_program["u_material"] = geom::vector<float, 3>{o.mat.diffuse, o.mat.specular.intensity, o.mat.specular.shininess};
|
|
|
|
o.mesh->draw();
|
|
}
|
|
}
|
|
|
|
// Setup destination framebuffer
|
|
|
|
assert(opts.framebuffer);
|
|
opts.framebuffer->bind();
|
|
|
|
gl::DrawBuffer(opts.draw_buffer);
|
|
|
|
gl::Viewport(opts.viewport[0].min, opts.viewport[1].min, opts.viewport[0].length(), opts.viewport[1].length());
|
|
|
|
gl::Disable(gl::DEPTH_TEST);
|
|
gl::Disable(gl::BLEND);
|
|
|
|
gl::ActiveTexture(gl::TEXTURE0);
|
|
impl().g_buffer_texture[0].bind();
|
|
gl::ActiveTexture(gl::TEXTURE1);
|
|
impl().g_buffer_texture[1].bind();
|
|
gl::ActiveTexture(gl::TEXTURE2);
|
|
impl().g_buffer_texture[2].bind();
|
|
gl::ActiveTexture(gl::TEXTURE3);
|
|
impl().g_buffer_texture[3].bind();
|
|
|
|
impl().screen_mesh.bind();
|
|
|
|
// TODO: directional light shadows
|
|
|
|
// TODO: point light shadows
|
|
|
|
// Draw unlit & ambient layers
|
|
|
|
impl().ambient_pass_program.bind();
|
|
impl().ambient_pass_program["u_ambient"] = opts.ambient;
|
|
impl().ambient_pass_program["u_max_intensity"] = opts.max_intensity;
|
|
gl::DrawArrays(gl::TRIANGLES, 0, 6);
|
|
|
|
gl::Enable(gl::BLEND);
|
|
gl::BlendFunc(gl::ONE, gl::ONE);
|
|
|
|
// Directional lights
|
|
|
|
geom::point<float, 2> bbox_hull_screen[8];
|
|
auto lit_bbox_hull_size = bbox_to_screen_fan(camera_transform, lit_bbox, bbox_hull_screen);
|
|
impl().screen_mesh.load(bbox_hull_screen, lit_bbox_hull_size, gl::TRIANGLE_FAN);
|
|
|
|
impl().directional_light_pass_program.bind();
|
|
impl().directional_light_pass_program["u_camera_position"] = camera_position;
|
|
impl().directional_light_pass_program["u_max_intensity"] = opts.max_intensity;
|
|
|
|
for (auto const & l : opts.directional_lights)
|
|
{
|
|
impl().directional_light_pass_program["u_light_direction"] = geom::normalized(l.direction);
|
|
impl().directional_light_pass_program["u_light_color"] = l.color;
|
|
impl().screen_mesh.draw();
|
|
}
|
|
|
|
// Point lights
|
|
|
|
float min_intensity = opts.min_intensity.value_or(opts.max_intensity / 256.f);
|
|
|
|
impl().point_light_pass_program.bind();
|
|
impl().point_light_pass_program["u_camera_position"] = camera_position;
|
|
impl().point_light_pass_program["u_max_intensity"] = opts.max_intensity;
|
|
|
|
for (auto const & l : opts.point_lights)
|
|
{
|
|
float I = std::max({l.color[0], l.color[1], l.color[2]});
|
|
auto r = geom::solve_quadratic(l.attenuation.c2, l.attenuation.c1, l.attenuation.c0 - I / min_intensity);
|
|
geom::box<float, 3> light_bbox;
|
|
if (r)
|
|
{
|
|
float light_influence_radius = r->second;
|
|
|
|
for (std::size_t i = 0; i < 3; ++i)
|
|
light_bbox[i] = {l.position[i] - light_influence_radius, l.position[i] + light_influence_radius};
|
|
|
|
light_bbox &= lit_bbox;
|
|
}
|
|
else
|
|
{
|
|
light_bbox = lit_bbox;
|
|
}
|
|
|
|
auto light_bbox_hull_size = bbox_to_screen_fan(camera_transform, light_bbox, bbox_hull_screen);
|
|
impl().screen_mesh.load(bbox_hull_screen, light_bbox_hull_size, gl::TRIANGLE_FAN);
|
|
|
|
impl().point_light_pass_program["u_light_position"] = l.position;
|
|
impl().point_light_pass_program["u_light_color"] = l.color;
|
|
impl().point_light_pass_program["u_light_attenuation"] = geom::vector{l.attenuation.c0, l.attenuation.c1, l.attenuation.c2};
|
|
impl().screen_mesh.draw();
|
|
}
|
|
|
|
check_error();
|
|
}
|
|
|
|
}
|