source/core/pipelinestate.h

   1 #ifndef MSP_GL_PIPELINESTATE_H_
   2 #define MSP_GL_PIPELINESTATE_H_
   3
   4 #include <vector>
   5 #include <msp/core/noncopyable.h>
   6 #include "blend.h"
   7 #include "cullface.h"
   8 #include "depthtest.h"
   9 #include "pipelinestate_backend.h"
  10 #include "primitivetype.h"
  11 #include "rect.h"
  12 #include "stenciltest.h"
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 class Buffer;
  18 class Framebuffer;
  19 class Program;
  20 class Sampler;
  21 class Texture;
  22 class UniformBlock;
  23 class VertexSetup;
  24
  25 /**
  26 Stores state for the entire GPU pipeline.
  27
  28 Applications normally use the higher-level Renderer class rather than this.
  29 */
  30 class PipelineState: public PipelineStateBackend
  31 {
  32         friend PipelineStateBackend;
  33
  34 private:
  35         enum ResourceType: std::uint8_t
  36         {
  37                 NO_RESOURCE,
  38                 UNIFORM_BLOCK,
  39                 SAMPLED_TEXTURE,
  40                 STORAGE_TEXTURE
  41         };
  42
  43         struct BoundResource
  44         {
  45                 int binding = 0;
  46                 ResourceType type = NO_RESOURCE;
  47                 mutable bool changed = false;
  48                 mutable bool used = false;
  49                 union
  50                 {
  51                         const UniformBlock *block;
  52                         const Texture *texture;
  53                 };
  54                 union
  55                 {
  56                         const Buffer *buffer;
  57                         const Sampler *sampler;
  58                 };
  59                 int mip_level = -1;
  60
  61                 BoundResource(int b): binding(b), texture(0), sampler(0) { }
  62         };
  63
  64         enum ChangeMask
  65         {
  66                 FRAMEBUFFER = 1,
  67                 VIEWPORT = 2,
  68                 SCISSOR = 4,
  69                 SHPROG = 8,
  70                 RESOURCES = 16,
  71                 VERTEX_SETUP = 64,
  72                 FACE_CULL = 128,
  73                 DEPTH_TEST = 256,
  74                 STENCIL_TEST = 512,
  75                 BLEND = 1024,
  76                 PRIMITIVE_TYPE = 2048
  77         };
  78
  79         const Framebuffer *framebuffer = 0;
  80         Rect viewport = Rect::max();
  81         Rect scissor = Rect::max();
  82         const Program *shprog = 0;
  83         std::vector<BoundResource> resources;
  84         const VertexSetup *vertex_setup = 0;
  85         PrimitiveType primitive_type = TRIANGLES;
  86         FaceWinding front_face = COUNTERCLOCKWISE;
  87         CullMode face_cull = NO_CULL;
  88         DepthTest depth_test;
  89         StencilTest stencil_test;
  90         Blend blend;
  91
  92         template<typename T>
  93         void set(T &, const T &, unsigned);
  94 public:
  95         void set_framebuffer(const Framebuffer *);
  96         void set_viewport(const Rect &);
  97         void set_scissor(const Rect &);
  98         void set_shader_program(const Program *);
  99         void set_uniform_block(int, const UniformBlock *);
 100         void set_texture(unsigned, const Texture *, const Sampler *);
 101         void set_texture(unsigned, const Texture *, int, const Sampler *);
 102         void set_storage_texture(unsigned, const Texture *);
 103 private:
 104         void set_texture_resource(unsigned, const Texture *, int, const Sampler *);
 105 public:
 106         void set_vertex_setup(const VertexSetup *);
 107         void set_primitive_type(PrimitiveType);
 108         void set_front_face(FaceWinding);
 109         void set_face_cull(CullMode);
 110         void set_depth_test(const DepthTest &);
 111         void set_stencil_test(const StencilTest &);
 112         void set_blend(const Blend &);
 113
 114         const Framebuffer *get_framebuffer() const { return framebuffer; }
 115         const Rect &get_viewport() const { return viewport; }
 116         const Program *get_shader_program() const { return shprog; }
 117         const VertexSetup *get_vertex_setup() const { return vertex_setup; }
 118         FaceWinding get_front_face() const { return front_face; }
 119         CullMode get_face_cull() const { return face_cull; }
 120 };
 121
 122 } // namespace GL
 123 } // namespace Msp
 124
 125 #endif