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  * Current vertex processing mode: fixed function vs. shader.
  77  * In reality, fixed function is probably implemented by a shader but that's
  78  * not what we care about here.
  79  */
  80 enum vp_mode {
  81    VP_FF,    /**< legacy / fixed function */
  82    VP_SHADER /**< ARB vertex program or GLSL vertex shader */
  83 };
  84
  85
  86 /**
  87  * Get current vertex processing mode (fixed function vs. shader).
  88  */
  89 static inline enum vp_mode
  90 get_vp_mode( struct gl_context *ctx )
  91 {
  92    if (!ctx->VertexProgram._Current)
  93       return VP_FF;
  94    else if (ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram)
  95       return VP_FF;
  96    else
  97       return VP_SHADER;
  98 }
  99
 100
 101 /**
 102  * This is called by glBegin, glDrawArrays and glDrawElements (and
 103  * variations of those calls).  When we transition from immediate mode
 104  * drawing to array drawing we need to invalidate the array state.
 105  *
 106  * glBegin/End builds vertex arrays.  Those arrays may look identical
 107  * to glDrawArrays arrays except that the position of the elements may
 108  * be different.  For example, arrays of (position3v, normal3f) vs. arrays
 109  * of (normal3f, position3f).  So we need to make sure we notify drivers
 110  * that arrays may be changing.
 111  */
 112 static inline void
 113 vbo_draw_method(struct vbo_context *vbo, gl_draw_method method)
 114 {
 115    struct gl_context *ctx = vbo->exec.ctx;
 116
 117    if (ctx->Array.DrawMethod != method) {
 118       switch (method) {
 119       case DRAW_ARRAYS:
 120          ctx->Array._DrawArrays = vbo->exec.array.inputs;
 121          break;
 122       case DRAW_BEGIN_END:
 123          ctx->Array._DrawArrays = vbo->exec.vtx.inputs;
 124          break;
 125       case DRAW_DISPLAY_LIST:
 126          ctx->Array._DrawArrays = vbo->save.inputs;
 127          break;
 128       default:
 129          unreachable("Bad VBO drawing method");
 130       }
 131
 132       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 133       ctx->Array.DrawMethod = method;
 134    }
 135 }
 136
 137
 138 /**
 139  * Return if format is integer. The immediate mode commands only emit floats
 140  * for non-integer types, thus everything else is integer.
 141  */
 142 static inline GLboolean
 143 vbo_attrtype_to_integer_flag(GLenum format)
 144 {
 145    switch (format) {
 146    case GL_FLOAT:
 147    case GL_DOUBLE:
 148       return GL_FALSE;
 149    case GL_INT:
 150    case GL_UNSIGNED_INT:
 151    case GL_UNSIGNED_INT64_ARB:
 152       return GL_TRUE;
 153    default:
 154       unreachable("Bad vertex attribute type");
 155       return GL_FALSE;
 156    }
 157 }
 158
 159 static inline GLboolean
 160 vbo_attrtype_to_double_flag(GLenum format)
 161 {
 162    switch (format) {
 163    case GL_FLOAT:
 164    case GL_INT:
 165    case GL_UNSIGNED_INT:
 166    case GL_UNSIGNED_INT64_ARB:
 167       return GL_FALSE;
 168    case GL_DOUBLE:
 169       return GL_TRUE;
 170    default:
 171       unreachable("Bad vertex attribute type");
 172       return GL_FALSE;
 173    }
 174 }
 175
 176
 177 /**
 178  * Return default component values for the given format.
 179  * The return type is an array of fi_types, because that's how we declare
 180  * the vertex storage : floats , integers or unsigned integers.
 181  */
 182 static inline const fi_type *
 183 vbo_get_default_vals_as_union(GLenum format)
 184 {
 185    static const GLfloat default_float[4] = { 0, 0, 0, 1 };
 186    static const GLint default_int[4] = { 0, 0, 0, 1 };
 187
 188    switch (format) {
 189    case GL_FLOAT:
 190       return (fi_type *)default_float;
 191    case GL_INT:
 192    case GL_UNSIGNED_INT:
 193       return (fi_type *)default_int;
 194    default:
 195       unreachable("Bad vertex format");
 196       return NULL;
 197    }
 198 }
 199
 200
 201 /**
 202  * Compute the max number of vertices which can be stored in
 203  * a vertex buffer, given the current vertex size, and the amount
 204  * of space already used.
 205  */
 206 static inline unsigned
 207 vbo_compute_max_verts(const struct vbo_exec_context *exec)
 208 {
 209    unsigned n = (VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
 210       (exec->vtx.vertex_size * sizeof(GLfloat));
 211    if (n == 0)
 212       return 0;
 213    /* Subtract one so we're always sure to have room for an extra
 214     * vertex for GL_LINE_LOOP -> GL_LINE_STRIP conversion.
 215     */
 216    n--;
 217    return n;
 218 }
 219
 220
 221 void
 222 vbo_try_prim_conversion(struct _mesa_prim *p);
 223
 224 bool
 225 vbo_can_merge_prims(const struct _mesa_prim *p0, const struct _mesa_prim *p1);
 226
 227 void
 228 vbo_merge_prims(struct _mesa_prim *p0, const struct _mesa_prim *p1);
 229
 230
 231 #endif /* VBO_PRIVATE_H */