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render crab start screen + lots of opengl changes

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This commit is contained in:
Matthew Berry 2021-08-01 15:14:11 -07:00
parent 1d381e8ca8
commit 9b0a5536b5
6 changed files with 66 additions and 14 deletions
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3
src/crab/common/frontend/controllers/gb_controller.cr
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@ -1,7 +1,8 @@
class GBController < Controller
getter emu : GB::GB
class_getter extensions : Array(String) = ["gb", "gbc"]
class_getter shader : String = "gb_colors.frag"
class_getter vertex_shader : String = "identity.vert"
class_getter fragment_shader : String = "gb_colors.frag"
getter width : Int32 = 160
getter height : Int32 = 144

3
src/crab/common/frontend/controllers/gba_controller.cr
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@ -1,7 +1,8 @@
class GBAController < Controller
getter emu : GBA::GBA
class_getter extensions : Array(String) = ["gba"]
class_getter shader : String = "gba_colors.frag"
class_getter vertex_shader : String = "identity.vert"
class_getter fragment_shader : String = "gba_colors.frag"
getter width : Int32 = 240
getter height : Int32 = 160

3
src/crab/common/frontend/controllers/stubbed_controller.cr
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@ -4,7 +4,8 @@ class StubbedController < Controller
getter window_width : Int32 = 240
getter window_height : Int32 = 160
class_getter extensions = [] of String
class_getter shader : String = "stubbed_colors.frag"
class_getter vertex_shader : String = "logo_shader.vert"
class_getter fragment_shader : String = "stubbed_colors.frag"
def emu : Emu
abort "Called emu method in StubbedController"

56
src/crab/common/frontend/sdl_opengl_imgui_frontend.cr
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@ -33,6 +33,9 @@ class SDLOpenGLImGuiFrontend < Frontend
@opengl_info : OpenGLInfo
@game_texture : UInt32 = 0
@crab_texture : UInt32 = 0
def initialize(bios : String?, rom : String?)
SDL.init(SDL::Init::VIDEO | SDL::Init::AUDIO | SDL::Init::JOYSTICK)
LibSDL.joystick_open 0
@ -48,8 +51,20 @@ class SDLOpenGLImGuiFrontend < Frontend
flags: SDL::Window::Flags::OPENGL | SDL::Window::Flags::RESIZABLE
)
@gl_context = setup_gl
@shader_programs = Hash.zip(CONTROLLERS, CONTROLLERS.map { |controller| create_shader_program(controller.shader) })
LibGL.use_program(@shader_programs[@controller.class])
@shader_programs = Hash.zip(CONTROLLERS, CONTROLLERS.map { |controller| create_shader_program(controller.vertex_shader, controller.fragment_shader) })
shader_program = @shader_programs[@controller.class]
LibGL.use_program(shader_program)
if stubbed?
@crab_texture, canvas_aspect = texture_from_png("README/crab.png")
window_aspect = @window.width / @window.height
aspect = LibGL.get_uniform_location(shader_program, "aspect")
LibGL.uniform_1f(aspect, window_aspect * canvas_aspect)
scale = LibGL.get_uniform_location(shader_program, "scale")
LibGL.uniform_1f(scale, 0.5)
end
@opengl_info = OpenGLInfo.new
@io = setup_imgui
pause(true) if stubbed?
@ -59,7 +74,7 @@ class SDLOpenGLImGuiFrontend < Frontend
end
def run : NoReturn
set_clear_color(87, 88, 153)
set_clear_color(60, 61, 107)
loop do
@controller.run_until_frame unless @pause
handle_input
@ -114,6 +129,7 @@ class SDLOpenGLImGuiFrontend < Frontend
LibSDL.set_window_position(@window, LibSDL::WindowPosition::CENTERED, LibSDL::WindowPosition::CENTERED)
LibGL.viewport(0, 0, @window.width, @window.height)
LibGL.use_program(@shader_programs[@controller.class])
LibGL.disable(LibGL::BLEND)
pause(false)
end
@ -154,6 +170,12 @@ class SDLOpenGLImGuiFrontend < Frontend
end
private def render_game : Nil
aspect = LibGL.get_uniform_location(@shader_programs[@controller.class], "aspect")
LibGL.uniform_1f(aspect, 1)
scale = LibGL.get_uniform_location(@shader_programs[@controller.class], "scale")
LibGL.uniform_1f(scale, 1)
LibGL.bind_texture(LibGL::TEXTURE_2D, @game_texture)
LibGL.tex_image_2d(
LibGL::TEXTURE_2D,
0,
@ -169,7 +191,8 @@ class SDLOpenGLImGuiFrontend < Frontend
end
def render_logo : Nil
LibGL.bind_texture(LibGL::TEXTURE_2D, @crab_texture)
LibGL.draw_arrays(LibGL::TRIANGLE_STRIP, 0, 4)
end
private def stubbed? : Bool
@ -320,31 +343,44 @@ class SDLOpenGLImGuiFrontend < Frontend
gl_context = LibSDL.gl_create_context @window
LibSDL.gl_set_swap_interval(0) # disable vsync
LibGL.enable(LibGL::BLEND)
LibGL.blend_func(LibGL::SRC_ALPHA, LibGL::ONE_MINUS_SRC_ALPHA)
LibGL.gen_textures(1, out texture)
LibGL.gen_textures(1, out game_texture)
LibGL.active_texture(LibGL::TEXTURE0)
LibGL.bind_texture(LibGL::TEXTURE_2D, texture)
LibGL.bind_texture(LibGL::TEXTURE_2D, game_texture)
@game_texture = game_texture
a = [LibGL::BLUE, LibGL::GREEN, LibGL::RED, LibGL::ONE] # flip the rgba to bgra where a is always 1
a_ptr = pointerof(a).as(Int32*)
LibGL.tex_parameter_iv(LibGL::TEXTURE_2D, LibGL::TEXTURE_SWIZZLE_RGBA, a_ptr)
LibGL.tex_parameter_i(LibGL::TEXTURE_2D, LibGL::TEXTURE_MIN_FILTER, LibGL::NEAREST)
LibGL.tex_parameter_i(LibGL::TEXTURE_2D, LibGL::TEXTURE_MAG_FILTER, LibGL::NEAREST)
LibGL.gen_vertex_arrays(1, out vao) # required even if not used in modern opengl
LibGL.bind_vertex_array(vao)
gl_context
end
private def create_shader_program(shader_name : String) : UInt32
private def texture_from_png(file : String) : Tuple(UInt32, Float64)
canvas = StumpyPNG.read(file)
pixels = canvas.pixels.map &.to_rgba
LibGL.gen_textures(1, out crab_texture)
LibGL.bind_texture(LibGL::TEXTURE_2D, crab_texture)
LibGL.tex_parameter_i(LibGL::TEXTURE_2D, LibGL::TEXTURE_MIN_FILTER, LibGL::NEAREST)
LibGL.tex_parameter_i(LibGL::TEXTURE_2D, LibGL::TEXTURE_MAG_FILTER, LibGL::NEAREST)
LibGL.tex_image_2d(LibGL::TEXTURE_2D, 0, LibGL::RGBA, canvas.width, canvas.height, 0, LibGL::RGBA, LibGL::UNSIGNED_BYTE, pixels)
{crab_texture, canvas.height / canvas.width}
end
private def create_shader_program(vertex_shader, fragment_shader : String) : UInt32
shader_program = LibGL.create_program
vert_shader_id = compile_shader(File.read("#{SHADERS}/identity.vert"), LibGL::VERTEX_SHADER)
frag_shader_id = compile_shader(File.read("#{SHADERS}/#{shader_name}"), LibGL::FRAGMENT_SHADER)
vert_shader_id = compile_shader(File.read("#{SHADERS}/#{vertex_shader}"), LibGL::VERTEX_SHADER)
frag_shader_id = compile_shader(File.read("#{SHADERS}/#{fragment_shader}"), LibGL::FRAGMENT_SHADER)
LibGL.attach_shader(shader_program, vert_shader_id)
LibGL.attach_shader(shader_program, frag_shader_id)
LibGL.link_program(shader_program)
LibGL.validate_program(shader_program)
LibGL.use_program(shader_program)
shader_program
end

1
src/crab/common/shaders/gba_colors.frag
View file

@ -15,5 +15,4 @@ void main() {
30 * color.b + 230 * color.g + 10 * color.r,
220 * color.b + 10 * color.g + 50 * color.r) / 255,
vec3(1.0 / outGamma));
frag_color.a = 0.5;
}

14
src/crab/common/shaders/logo_shader.vert Normal file
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@ -0,0 +1,14 @@
#version 330 core
out vec2 tex_coord;
uniform float aspect;
uniform float scale;
const vec2 vertices[4] = vec2[](vec2(-1.0, -1.0), vec2(1.0, -1.0), vec2(-1.0, 1.0), vec2(1.0, 1.0));
void main() {
vec2 scaled_xy = vec2(vertices[gl_VertexID]) * scale;
gl_Position = vec4(scaled_xy.x, scaled_xy.y * aspect, 0.0, 1.0);
tex_coord = (vertices[gl_VertexID] + 1.0) / vec2(2.0, -2.0);
}