libs/render/src/eu/render/state.cc
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include "eu/render/state.h" | ||
| 2 | |||
| 3 | |||
| 4 | #include "eu/assert/assert.h" | ||
| 5 | #include "eu/base/cint.h" | ||
| 6 | |||
| 7 | #include "eu/render/texture.h" | ||
| 8 | #include "eu/render/uniform.h" | ||
| 9 | #include "eu/render/opengl_utils.h" | ||
| 10 | |||
| 11 | namespace eu::render | ||
| 12 | { | ||
| 13 | |||
| 14 | template<typename T> | ||
| 15 | ✗ | bool should_change(std::optional<T>* current_state, T new_state) | |
| 16 | { | ||
| 17 | // if there is a value, and that is the same... then don't update opengl | ||
| 18 | ✗ | if (*current_state && *current_state == new_state) | |
| 19 | { | ||
| 20 | ✗ | return false; | |
| 21 | } | ||
| 22 | |||
| 23 | ✗ | *current_state = new_state; | |
| 24 | ✗ | return true; | |
| 25 | } | ||
| 26 | |||
| 27 | ✗ | void apply(std::optional<bool>* current_state, bool new_state, GLenum gl_type) | |
| 28 | { | ||
| 29 | ✗ | if (should_change(current_state, new_state)) | |
| 30 | { | ||
| 31 | ✗ | if (new_state) | |
| 32 | { | ||
| 33 | ✗ | glEnable(gl_type); | |
| 34 | } | ||
| 35 | else | ||
| 36 | { | ||
| 37 | ✗ | glDisable(gl_type); | |
| 38 | } | ||
| 39 | } | ||
| 40 | ✗ | } | |
| 41 | |||
| 42 | ✗ | GLenum enum_from_c(Compare new_state) | |
| 43 | { | ||
| 44 | ✗ | switch (new_state) | |
| 45 | { | ||
| 46 | ✗ | case Compare::always: return GL_ALWAYS; | |
| 47 | ✗ | case Compare::never: return GL_NEVER; | |
| 48 | ✗ | case Compare::less: return GL_LESS; | |
| 49 | ✗ | case Compare::equal: return GL_EQUAL; | |
| 50 | ✗ | case Compare::less_equal: return GL_LEQUAL; | |
| 51 | ✗ | case Compare::greater: return GL_GREATER; | |
| 52 | ✗ | case Compare::not_equal: return GL_NOTEQUAL; | |
| 53 | ✗ | case Compare::greater_equal: return GL_GEQUAL; | |
| 54 | ✗ | default: DIE("Invalid depth func"); return GL_LESS; | |
| 55 | } | ||
| 56 | } | ||
| 57 | |||
| 58 | ✗ | GLenum enum_from_sa (StencilAction sa) | |
| 59 | { | ||
| 60 | ✗ | switch (sa) | |
| 61 | { | ||
| 62 | ✗ | case StencilAction::keep: return GL_KEEP; | |
| 63 | ✗ | case StencilAction::zero: return GL_ZERO; | |
| 64 | ✗ | case StencilAction::replace: return GL_REPLACE; | |
| 65 | ✗ | case StencilAction::increase: return GL_INCR; | |
| 66 | ✗ | case StencilAction::increase_wrap: return GL_INCR_WRAP; | |
| 67 | ✗ | case StencilAction::decrease: return GL_DECR; | |
| 68 | ✗ | case StencilAction::decrease_wrap: return GL_DECR_WRAP; | |
| 69 | ✗ | case StencilAction::invert: return GL_INVERT; | |
| 70 | ✗ | default: DIE("Invalid stencil action"); return GL_KEEP; | |
| 71 | } | ||
| 72 | }; | ||
| 73 | |||
| 74 | ✗ | StateChanger::StateChanger(State* s) | |
| 75 | ✗ | : states(s) | |
| 76 | { | ||
| 77 | ✗ | } | |
| 78 | |||
| 79 | ✗ | StateChanger& StateChanger::cull_face(bool new_state) | |
| 80 | { | ||
| 81 | ✗ | apply(&states->cull_face, new_state, GL_CULL_FACE); | |
| 82 | ✗ | return *this; | |
| 83 | } | ||
| 84 | |||
| 85 | ✗ | StateChanger& StateChanger::blending(bool new_state) | |
| 86 | { | ||
| 87 | ✗ | apply(&states->blending, new_state, GL_BLEND); | |
| 88 | ✗ | return *this; | |
| 89 | } | ||
| 90 | |||
| 91 | ✗ | StateChanger& StateChanger::depth_test(bool new_state) | |
| 92 | { | ||
| 93 | ✗ | apply(&states->depth_test, new_state, GL_DEPTH_TEST); | |
| 94 | ✗ | return *this; | |
| 95 | } | ||
| 96 | |||
| 97 | ✗ | StateChanger& StateChanger::depth_mask(bool new_state) | |
| 98 | { | ||
| 99 | ✗ | if (should_change(&states->depth_mask, new_state)) | |
| 100 | { | ||
| 101 | ✗ | glDepthMask(new_state ? GL_TRUE : GL_FALSE); | |
| 102 | } | ||
| 103 | ✗ | return *this; | |
| 104 | } | ||
| 105 | |||
| 106 | ✗ | StateChanger& StateChanger::depth_func(Compare new_state) | |
| 107 | { | ||
| 108 | ✗ | if (should_change(&states->depth_func, new_state)) | |
| 109 | { | ||
| 110 | ✗ | const auto mode = enum_from_c(new_state); | |
| 111 | ✗ | glDepthFunc(mode); | |
| 112 | } | ||
| 113 | |||
| 114 | ✗ | return *this; | |
| 115 | } | ||
| 116 | |||
| 117 | ✗ | StateChanger& StateChanger::stencil_test(bool new_state) | |
| 118 | { | ||
| 119 | ✗ | apply(&states->stencil_test, new_state, GL_STENCIL_TEST); | |
| 120 | ✗ | return *this; | |
| 121 | } | ||
| 122 | |||
| 123 | /// Set a bitmask that is ANDed with the stencil value about to be written to the buffer. | ||
| 124 | ✗ | StateChanger& StateChanger::stencil_mask(u32 new_state) | |
| 125 | { | ||
| 126 | ✗ | if (should_change(&states->stencil_mask, new_state)) | |
| 127 | { | ||
| 128 | ✗ | glStencilMask(new_state); | |
| 129 | } | ||
| 130 | |||
| 131 | ✗ | return *this; | |
| 132 | } | ||
| 133 | |||
| 134 | ✗ | StateChanger& StateChanger::stencil_func(Compare func, i32 ref, u32 mask) | |
| 135 | { | ||
| 136 | ✗ | if (should_change(&states->stencil_func, {func, ref, mask})) | |
| 137 | { | ||
| 138 | ✗ | glStencilFunc(enum_from_c(func), ref, mask); | |
| 139 | } | ||
| 140 | |||
| 141 | ✗ | return *this; | |
| 142 | } | ||
| 143 | |||
| 144 | ✗ | StateChanger& StateChanger::render_mode(RenderMode new_state) | |
| 145 | { | ||
| 146 | ✗ | if (should_change(&states->render_mode, new_state)) | |
| 147 | { | ||
| 148 | ✗ | const auto mode = ([new_state]() -> GLenum | |
| 149 | { | ||
| 150 | ✗ | switch (new_state) | |
| 151 | { | ||
| 152 | ✗ | case RenderMode::fill: return GL_FILL; | |
| 153 | ✗ | case RenderMode::line: return GL_LINE; | |
| 154 | ✗ | case RenderMode::point: return GL_POINT; | |
| 155 | ✗ | default: DIE("Invalid render mode"); return GL_FILL; | |
| 156 | } | ||
| 157 | ✗ | })(); | |
| 158 | ✗ | glPolygonMode(GL_FRONT_AND_BACK, mode); | |
| 159 | } | ||
| 160 | ✗ | return *this; | |
| 161 | } | ||
| 162 | |||
| 163 | ✗ | StateChanger& StateChanger::stencil_op(StencilAction stencil_fail, StencilAction depth_fail, StencilAction pass) | |
| 164 | { | ||
| 165 | ✗ | if (should_change(&states->stencil_op, {stencil_fail, depth_fail, pass})) | |
| 166 | { | ||
| 167 | // todo(Gustav): look into using glStencilOpSeparate instead to specify front and back faces | ||
| 168 | // https://registry.khronos.org/OpenGL-Refpages/gl4/html/glStencilOpSeparate.xhtml | ||
| 169 | ✗ | glStencilOp(enum_from_sa(stencil_fail), enum_from_sa(depth_fail), enum_from_sa(pass)); | |
| 170 | } | ||
| 171 | |||
| 172 | ✗ | return *this; | |
| 173 | } | ||
| 174 | |||
| 175 | ✗ | StateChanger& StateChanger::cull_face_mode(CullFace new_state) | |
| 176 | { | ||
| 177 | ✗ | if (should_change(&states->cull_face_mode, new_state)) | |
| 178 | { | ||
| 179 | ✗ | const auto mode = ([new_state]() -> GLenum | |
| 180 | { | ||
| 181 | ✗ | switch (new_state) | |
| 182 | { | ||
| 183 | ✗ | case CullFace::front: return GL_FRONT; | |
| 184 | ✗ | case CullFace::back: return GL_BACK; | |
| 185 | ✗ | case CullFace::front_and_back: return GL_FRONT_AND_BACK; | |
| 186 | ✗ | default: DIE("Invalid cull face mode"); return GL_BACK; | |
| 187 | } | ||
| 188 | ✗ | })(); | |
| 189 | ✗ | glCullFace(mode); | |
| 190 | } | ||
| 191 | ✗ | return *this; | |
| 192 | } | ||
| 193 | |||
| 194 | ✗ | StateChanger& StateChanger::blend_mode(Blend src, Blend dst) | |
| 195 | { | ||
| 196 | ✗ | if (should_change(&states->blend_mode, {src, dst})) | |
| 197 | { | ||
| 198 | ✗ | const auto convert = [](Blend b) -> GLenum | |
| 199 | { | ||
| 200 | ✗ | switch (b) | |
| 201 | { | ||
| 202 | ✗ | case Blend::zero: return GL_ZERO; | |
| 203 | ✗ | case Blend::one: return GL_ONE; | |
| 204 | ✗ | case Blend::src_color: return GL_SRC_COLOR; | |
| 205 | ✗ | case Blend::one_minus_src_color: return GL_ONE_MINUS_SRC_COLOR; | |
| 206 | ✗ | case Blend::dst_color: return GL_DST_COLOR; | |
| 207 | ✗ | case Blend::one_minus_dst_color: return GL_ONE_MINUS_DST_COLOR; | |
| 208 | ✗ | case Blend::src_alpha: return GL_SRC_ALPHA; | |
| 209 | ✗ | case Blend::one_minus_src_alpha: return GL_ONE_MINUS_SRC_ALPHA; | |
| 210 | ✗ | case Blend::dst_alpha: return GL_DST_ALPHA; | |
| 211 | ✗ | case Blend::one_minus_dst_alpha: return GL_ONE_MINUS_DST_ALPHA; | |
| 212 | ✗ | case Blend::constant_color: return GL_CONSTANT_COLOR; | |
| 213 | ✗ | case Blend::one_minus_constant_color: return GL_ONE_MINUS_CONSTANT_COLOR; | |
| 214 | ✗ | case Blend::constant_alpha: return GL_CONSTANT_ALPHA; | |
| 215 | ✗ | case Blend::one_minus_constant_alpha: return GL_ONE_MINUS_CONSTANT_ALPHA; | |
| 216 | ✗ | case Blend::src_alpha_saturate: return GL_SRC_ALPHA_SATURATE; | |
| 217 | ✗ | case Blend::src1_color: return GL_SRC1_COLOR; | |
| 218 | ✗ | case Blend::one_minus_src1_color: return GL_ONE_MINUS_SRC1_COLOR; | |
| 219 | ✗ | case Blend::src1_alpha: return GL_SRC1_ALPHA; | |
| 220 | ✗ | case Blend::one_minus_src1_alpha: return GL_ONE_MINUS_SRC1_ALPHA; | |
| 221 | ✗ | default: DIE("Invalid blend mode"); return GL_ZERO; | |
| 222 | } | ||
| 223 | }; | ||
| 224 | ✗ | glBlendFunc(convert(src), convert(dst)); | |
| 225 | } | ||
| 226 | ✗ | return *this; | |
| 227 | } | ||
| 228 | |||
| 229 | ✗ | StateChanger& StateChanger::activate_texture(int new_texture) | |
| 230 | { | ||
| 231 | ✗ | if (should_change(&states->active_texture, new_texture)) | |
| 232 | { | ||
| 233 | ✗ | glActiveTexture(glenum_from_int(GL_TEXTURE0 + new_texture)); | |
| 234 | } | ||
| 235 | ✗ | return *this; | |
| 236 | } | ||
| 237 | |||
| 238 | ✗ | StateChanger& StateChanger::bind_texture_2d(int slot, unsigned int texture) | |
| 239 | { | ||
| 240 | ✗ | ASSERT(slot == states->active_texture); | |
| 241 | ✗ | if (should_change(&states->texture_bound[sizet_from_int(slot)], texture)) | |
| 242 | { | ||
| 243 | ✗ | glBindTexture(GL_TEXTURE_2D, texture); | |
| 244 | } | ||
| 245 | ✗ | return *this; | |
| 246 | } | ||
| 247 | |||
| 248 | ✗ | StateChanger& StateChanger::bind_texture_cubemap(int slot, unsigned int texture) | |
| 249 | { | ||
| 250 | ✗ | ASSERT(slot == states->active_texture); | |
| 251 | ✗ | if (should_change(&states->texture_bound[sizet_from_int(slot)], texture)) | |
| 252 | { | ||
| 253 | ✗ | glBindTexture(GL_TEXTURE_CUBE_MAP, texture); | |
| 254 | } | ||
| 255 | ✗ | return *this; | |
| 256 | } | ||
| 257 | |||
| 258 | ✗ | void bind_texture_2d(State* states, const Uniform& uniform, const Texture2d& texture) | |
| 259 | { | ||
| 260 | ✗ | if (uniform.is_valid() == false) | |
| 261 | { | ||
| 262 | ✗ | return; | |
| 263 | } | ||
| 264 | ✗ | ASSERT(uniform.texture >= 0); | |
| 265 | |||
| 266 | ✗ | StateChanger{states}.activate_texture(uniform.texture).bind_texture_2d(uniform.texture, texture.id); | |
| 267 | } | ||
| 268 | |||
| 269 | ✗ | void bind_texture_2d(State* states, const Uniform& uniform, const FrameBuffer& texture) | |
| 270 | { | ||
| 271 | ✗ | if (uniform.is_valid() == false) | |
| 272 | { | ||
| 273 | ✗ | return; | |
| 274 | } | ||
| 275 | ✗ | ASSERT(uniform.texture >= 0); | |
| 276 | ✗ | ASSERT(texture.debug_is_msaa == false); | |
| 277 | |||
| 278 | ✗ | StateChanger{states}.activate_texture(uniform.texture).bind_texture_2d(uniform.texture, texture.id); | |
| 279 | } | ||
| 280 | |||
| 281 | ✗ | void bind_texture_cubemap(State* states, const Uniform& uniform, const TextureCubemap& texture) | |
| 282 | { | ||
| 283 | ✗ | if (uniform.is_valid() == false) | |
| 284 | { | ||
| 285 | ✗ | return; | |
| 286 | } | ||
| 287 | ✗ | ASSERT(uniform.texture >= 0); | |
| 288 | |||
| 289 | ✗ | StateChanger{states}.activate_texture(uniform.texture).bind_texture_cubemap(uniform.texture, texture.id); | |
| 290 | } | ||
| 291 | |||
| 292 | } // namespace eu::render | ||
| 293 |