src/mesa/state_tracker/st_context.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #ifndef ST_CONTEXT_H
  29 #define ST_CONTEXT_H
  30
  31 #include "mtypes.h"
  32 #include "pipe/p_state.h"
  33
  34
  35 struct st_context;
  36 struct st_region;
  37 struct st_texture_object;
  38 struct st_texture_image;
  39 struct st_fragment_program;
  40 struct draw_context;
  41 struct draw_stage;
  42 struct cso_cache;
  43 struct cso_blend;
  44
  45 #define ST_NEW_MESA                    0x1 /* Mesa state has changed */
  46 #define ST_NEW_FRAGMENT_PROGRAM        0x2
  47 #define ST_NEW_VERTEX_PROGRAM          0x4
  48
  49
  50 struct st_state_flags {
  51    GLuint mesa;
  52    GLuint st;
  53 };
  54
  55 struct st_tracked_state {
  56    const char *name;
  57    struct st_state_flags dirty;
  58    void (*update)( struct st_context *st );
  59 };
  60
  61
  62
  63
  64 struct st_context
  65 {
  66    GLcontext *ctx;
  67
  68    struct pipe_context *pipe;
  69
  70    struct draw_context *draw;  /**< For selection/feedback */
  71    struct draw_stage *feedback_stage;  /**< For GL_FEEDBACK rendermode */
  72    struct draw_stage *selection_stage;  /**< For GL_SELECT rendermode */
  73
  74    /* Some state is contained in constant objects.
  75     * Other state is just parameter values.
  76     */
  77    struct {
  78       const struct cso_alpha_test      *alpha_test;
  79       const struct cso_blend           *blend;
  80       const struct cso_sampler         *sampler[PIPE_MAX_SAMPLERS];
  81       const struct cso_depth_stencil   *depth_stencil;
  82       const struct cso_rasterizer      *rasterizer;
  83       const struct cso_fragment_shader *fs;
  84       const struct cso_vertex_shader   *vs;
  85
  86       struct pipe_blend_color  blend_color;
  87       struct pipe_clear_color_state clear_color;
  88       struct pipe_clip_state clip;
  89       struct pipe_constant_buffer constants[2];
  90       struct pipe_feedback_state feedback;
  91       struct pipe_framebuffer_state framebuffer;
  92       struct pipe_mipmap_tree *texture[PIPE_MAX_SAMPLERS];
  93       struct pipe_poly_stipple poly_stipple;
  94       struct pipe_scissor_state scissor;
  95       struct pipe_viewport_state viewport;
  96    } state;
  97
  98    struct {
  99       struct st_tracked_state tracked_state[2];
 100    } constants;
 101
 102    struct {
 103       struct gl_fragment_program *fragment_program;
 104    } cb;
 105
 106    struct {
 107       GLuint frontbuffer_dirty:1;
 108    } flags;
 109
 110    char vendor[100];
 111    char renderer[100];
 112
 113    /** Can we access the front/back color buffers as pipe_regions?
 114     * We can't with the Xlib driver...
 115     * This is a hack that should be fixed someday.
 116     */
 117    GLboolean haveFramebufferRegions;
 118
 119    /* State to be validated:
 120     */
 121    struct st_tracked_state **atoms;
 122    GLuint nr_atoms;
 123
 124    struct st_state_flags dirty;
 125
 126    GLfloat polygon_offset_scale; /* ?? */
 127
 128    /** Mapping from VERT_RESULT_x to post-transformed vertex slot */
 129    const GLuint *vertex_result_to_slot;
 130
 131    struct st_vertex_program *vp;    /**< Currently bound vertex program */
 132    struct st_fragment_program *fp;  /**< Currently bound fragment program */
 133
 134    /**
 135     * Buffer object which stores the ctx->Current.Attrib[] values.
 136     * Used for vertex array drawing when we we need an attribute for
 137     * which there's no enabled array.
 138     */
 139    struct pipe_buffer_handle *default_attrib_buffer;
 140
 141    struct cso_cache *cache;
 142 };
 143
 144
 145 /* Need this so that we can implement Mesa callbacks in this module.
 146  */
 147 static INLINE struct st_context *st_context(GLcontext *ctx)
 148 {
 149    return ctx->st;
 150 }
 151
 152
 153 extern void st_init_driver_functions(struct dd_function_table *functions);
 154
 155
 156
 157 #define Y_0_TOP 1
 158 #define Y_0_BOTTOM 2
 159
 160 static INLINE GLuint
 161 st_fb_orientation(const struct gl_framebuffer *fb)
 162 {
 163    if (fb && fb->Name == 0) {
 164       /* Drawing into a window (on-screen buffer).
 165        *
 166        * Negate Y scale to flip image vertically.
 167        * The NDC Y coords prior to viewport transformation are in the range
 168        * [y=-1=bottom, y=1=top]
 169        * Hardware window coords are in the range [y=0=top, y=H-1=bottom] where
 170        * H is the window height.
 171        * Use the viewport transformation to invert Y.
 172        */
 173       return Y_0_TOP;
 174    }
 175    else {
 176       /* Drawing into user-created FBO (very likely a texture).
 177        *
 178        * For textures, T=0=Bottom, so by extension Y=0=Bottom for rendering.
 179        */
 180       return Y_0_BOTTOM;
 181    }
 182 }
 183
 184
 185 #endif