Class: Doom::Render::HardwareRenderer

Inherits:
Renderer
  • Object
show all
Includes:
OpenGL
Defined in:
lib/doom/render/hardware_renderer.rb

Overview

GPU rasterizer hosted inside Gosu's OpenGL context. The initial backend renders real world triangles with perspective projection and depth test.

Direct Known Subclasses

RayTracingRenderer

Defined Under Namespace

Classes: Batch

Constant Summary collapse

ANIMATED_DECORATIONS = 
%w[TBLU TGRN TRED SMIT COLU CAND CBRA].freeze
VERTEX_STRIDE = 
8 * 4
MAX_LIGHTS = 
8
STATIC_LIGHTS = 
{
  44 => [0.25, 0.35, 1.0], 45 => [0.25, 1.0, 0.35],
  46 => [1.0, 0.22, 0.12], 34 => [1.0, 0.65, 0.22],
  35 => [1.0, 0.65, 0.22], 2028 => [1.0, 0.75, 0.35]
}.freeze

Constants inherited from Renderer

Renderer::SKY_TEXTUREMID, Renderer::SKY_XSCALE, Renderer::SKY_YSCALE

Instance Attribute Summary collapse

Attributes inherited from Renderer

#animations, #colormap, #combat, #cos_angle, #flats, #framebuffer, #hidden_things, #leveltime, #map, #monster_ai, #palette, #player_angle, #player_x, #player_y, #player_z, #players, #sin_angle, #skip_background_fill, #sprites, #textures, #view_player, #wad

Instance Method Summary collapse

Methods inherited from Renderer

#apply_view, #build_native_renderer, #check_plane, #draw_all_visplanes, #draw_floor_ceiling_background, #draw_sky_plane, #draw_span, #fill_uncovered_with_sector, #find_or_create_visplane, #native_wall_pass, #precompute_column_data, #render_visplane_spans, #set_player, #sprite_diagnostics

Constructor Details

#initialize ⇒ HardwareRenderer

Returns a new instance of HardwareRenderer.



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# File 'lib/doom/render/hardware_renderer.rb', line 30

def initialize(...)
  super
  @mesh = WorldMesh.new(@map, @textures)
  @geometry_signature = geometry_signature
  @gl_textures = {}
  @texture_dimensions = {}
  @gpu_batches = nil
end

Instance Attribute Details

#mesh ⇒ Object (readonly)

Returns the value of attribute mesh.



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# File 'lib/doom/render/hardware_renderer.rb', line 28

def mesh
  @mesh
end

Instance Method Details

#draw_hardware(viewport_width, viewport_height) ⇒ Object 



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# File 'lib/doom/render/hardware_renderer.rb', line 55

def draw_hardware(viewport_width, viewport_height)
  Gosu.gl do
    load_opengl_library
    glEnable(GL_DEPTH_TEST)
    glEnable(GL_CULL_FACE)
    glCullFace(GL_BACK)
    glFrontFace(GL_CCW)
    glEnable(GL_TEXTURE_2D)
    glDepthFunc(GL_LEQUAL)
    glClearColor(0.025, 0.025, 0.04, 1.0)
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

    draw_sky

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity
    aspect = viewport_width.to_f / viewport_height
    glFrustum(-1.0, 1.0, -1.0 / aspect, 1.0 / aspect, 1.0, 16_384.0)
    glMatrixMode(GL_MODELVIEW)
    glLoadMatrixf(view_matrix.pack('f16'))

    rebuild_gpu_batches if @gpu_batches.nil? || @gpu_batches_dirty
    setup_lighting

    # Invisible back faces must still occlude rooms when the camera is
    # outside the playable map, matching the classic BSP solid-wall clip.
    draw_occluder_depth_prepass
    glEnable(GL_CULL_FACE)

    draw_gpu_batches
    glDisable(GL_LIGHTING)
    glBindTexture(GL_TEXTURE_2D, 0)
    glDisable(GL_TEXTURE_2D)
    glDisable(GL_CULL_FACE)
    # Sprites should be depth-tested against walls, not sliced by the
    # floor they stand on. Preserve the color buffer, rebuild depth from
    # walls only, then draw billboarded things.
    glClear(GL_DEPTH_BUFFER_BIT)
    draw_occluder_depth_prepass(include_ceilings: true)
    draw_sprites
    capture_frame if ENV['DOOM_GL_CAPTURE'] && !@frame_captured
    glDisable(GL_DEPTH_TEST)
  end
end

#hardware? ⇒ Boolean

Returns:



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# File 'lib/doom/render/hardware_renderer.rb', line 39

def hardware?
  true
end

#render_frame ⇒ Object

Simulation still calls render_frame; hardware drawing must happen from Window#draw, inside Gosu.gl, so only reset the compatibility framebuffer.



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# File 'lib/doom/render/hardware_renderer.rb', line 45

def render_frame
  signature = geometry_signature
  if signature != @geometry_signature
    @mesh = WorldMesh.new(@map, @textures)
    @geometry_signature = signature
    @gpu_batches_dirty = true
  end
  @framebuffer.fill(0)
end