src/mesa/vbo/vbo_private.h

   1 /*
   2  * mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * Types, functions, etc which are private to the VBO module.
  28  */
  29
  30
  31 #ifndef VBO_PRIVATE_H
  32 #define VBO_PRIVATE_H
  33
  34
  35 #include "vbo/vbo_attrib.h"
  36 #include "vbo/vbo_exec.h"
  37 #include "vbo/vbo_save.h"
  38 #include "main/mtypes.h"
  39
  40
  41 struct _glapi_table;
  42 struct _mesa_prim;
  43
  44
  45 struct vbo_context {
  46    struct gl_vertex_array currval[VBO_ATTRIB_MAX];
  47
  48    /** Map VERT_ATTRIB_x to VBO_ATTRIB_y */
  49    GLubyte map_vp_none[VERT_ATTRIB_MAX];
  50    GLubyte map_vp_arb[VERT_ATTRIB_MAX];
  51
  52    struct vbo_exec_context exec;
  53    struct vbo_save_context save;
  54
  55    /* Callback into the driver.  This must always succeed, the driver
  56     * is responsible for initiating any fallback actions required:
  57     */
  58    vbo_draw_func draw_prims;
  59
  60    /* Optional callback for indirect draws. This allows multidraws to not be
  61     * broken up, as well as for the actual count to be passed in as a separate
  62     * indirect parameter.
  63     */
  64    vbo_indirect_draw_func draw_indirect_prims;
  65 };
  66
  67
  68 static inline struct vbo_context *
  69 vbo_context(struct gl_context *ctx)
  70 {
  71    return ctx->vbo_context;
  72 }
  73
  74
  75 /**
  76  * Return VP_x token to indicate whether we're running fixed-function
  77  * vertex transformation, an NV vertex program or ARB vertex program/shader.
  78  */
  79 static inline enum vp_mode
  80 get_program_mode( struct gl_context *ctx )
  81 {
  82    if (!ctx->VertexProgram._Current)
  83       return VP_NONE;
  84    else if (ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram)
  85       return VP_NONE;
  86    else
  87       return VP_ARB;
  88 }
  89
  90
  91 /**
  92  * This is called by glBegin, glDrawArrays and glDrawElements (and
  93  * variations of those calls).  When we transition from immediate mode
  94  * drawing to array drawing we need to invalidate the array state.
  95  *
  96  * glBegin/End builds vertex arrays.  Those arrays may look identical
  97  * to glDrawArrays arrays except that the position of the elements may
  98  * be different.  For example, arrays of (position3v, normal3f) vs. arrays
  99  * of (normal3f, position3f).  So we need to make sure we notify drivers
 100  * that arrays may be changing.
 101  */
 102 static inline void
 103 vbo_draw_method(struct vbo_context *vbo, gl_draw_method method)
 104 {
 105    struct gl_context *ctx = vbo->exec.ctx;
 106
 107    if (ctx->Array.DrawMethod != method) {
 108       switch (method) {
 109       case DRAW_ARRAYS:
 110          ctx->Array._DrawArrays = vbo->exec.array.inputs;
 111          break;
 112       case DRAW_BEGIN_END:
 113          ctx->Array._DrawArrays = vbo->exec.vtx.inputs;
 114          break;
 115       case DRAW_DISPLAY_LIST:
 116          ctx->Array._DrawArrays = vbo->save.inputs;
 117          break;
 118       default:
 119          unreachable("Bad VBO drawing method");
 120       }
 121
 122       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 123       ctx->Array.DrawMethod = method;
 124    }
 125 }
 126
 127
 128 /**
 129  * Return if format is integer. The immediate mode commands only emit floats
 130  * for non-integer types, thus everything else is integer.
 131  */
 132 static inline GLboolean
 133 vbo_attrtype_to_integer_flag(GLenum format)
 134 {
 135    switch (format) {
 136    case GL_FLOAT:
 137    case GL_DOUBLE:
 138       return GL_FALSE;
 139    case GL_INT:
 140    case GL_UNSIGNED_INT:
 141    case GL_UNSIGNED_INT64_ARB:
 142       return GL_TRUE;
 143    default:
 144       unreachable("Bad vertex attribute type");
 145       return GL_FALSE;
 146    }
 147 }
 148
 149 static inline GLboolean
 150 vbo_attrtype_to_double_flag(GLenum format)
 151 {
 152    switch (format) {
 153    case GL_FLOAT:
 154    case GL_INT:
 155    case GL_UNSIGNED_INT:
 156    case GL_UNSIGNED_INT64_ARB:
 157       return GL_FALSE;
 158    case GL_DOUBLE:
 159       return GL_TRUE;
 160    default:
 161       unreachable("Bad vertex attribute type");
 162       return GL_FALSE;
 163    }
 164 }
 165
 166
 167 /**
 168  * Return default component values for the given format.
 169  * The return type is an array of fi_types, because that's how we declare
 170  * the vertex storage : floats , integers or unsigned integers.
 171  */
 172 static inline const fi_type *
 173 vbo_get_default_vals_as_union(GLenum format)
 174 {
 175    static const GLfloat default_float[4] = { 0, 0, 0, 1 };
 176    static const GLint default_int[4] = { 0, 0, 0, 1 };
 177
 178    switch (format) {
 179    case GL_FLOAT:
 180       return (fi_type *)default_float;
 181    case GL_INT:
 182    case GL_UNSIGNED_INT:
 183       return (fi_type *)default_int;
 184    default:
 185       unreachable("Bad vertex format");
 186       return NULL;
 187    }
 188 }
 189
 190
 191 /**
 192  * Compute the max number of vertices which can be stored in
 193  * a vertex buffer, given the current vertex size, and the amount
 194  * of space already used.
 195  */
 196 static inline unsigned
 197 vbo_compute_max_verts(const struct vbo_exec_context *exec)
 198 {
 199    unsigned n = (VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 200       (exec->vtx.vertex_size * sizeof(GLfloat));
 201    if (n == 0)
 202       return 0;
 203    /* Subtract one so we're always sure to have room for an extra
 204     * vertex for GL_LINE_LOOP -> GL_LINE_STRIP conversion.
 205     */
 206    n--;
 207    return n;
 208 }
 209
 210
 211 void
 212 vbo_try_prim_conversion(struct _mesa_prim *p);
 213
 214 bool
 215 vbo_can_merge_prims(const struct _mesa_prim *p0, const struct _mesa_prim *p1);
 216
 217 void
 218 vbo_merge_prims(struct _mesa_prim *p0, const struct _mesa_prim *p1);
 219
 220
 221 #endif /* VBO_PRIVATE_H */