src/mesa/main/drawpix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "glheader.h"
  26 #include "imports.h"
  27 #include "bufferobj.h"
  28 #include "context.h"
  29 #include "drawpix.h"
  30 #include "enums.h"
  31 #include "feedback.h"
  32 #include "framebuffer.h"
  33 #include "readpix.h"
  34 #include "state.h"
  35 #include "main/dispatch.h"
  36
  37
  38 #if FEATURE_drawpix
  39
  40
  41 /**
  42  * If a fragment program is enabled, check that it's valid.
  43  * \return GL_TRUE if valid, GL_FALSE otherwise
  44  */
  45 static GLboolean
  46 valid_fragment_program(GLcontext *ctx)
  47 {
  48    return !(ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled);
  49 }
  50
  51
  52 /*
  53  * Execute glDrawPixels
  54  */
  55 static void GLAPIENTRY
  56 _mesa_DrawPixels( GLsizei width, GLsizei height,
  57                   GLenum format, GLenum type, const GLvoid *pixels )
  58 {
  59    GET_CURRENT_CONTEXT(ctx);
  60    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  61
  62    if (width < 0 || height < 0) {
  63       _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
  64       return;
  65    }
  66
  67    /* We're not using the current vertex program, and the driver may install
  68     * it's own.
  69     */
  70    _mesa_set_vp_override(ctx, GL_TRUE);
  71
  72    if (ctx->NewState) {
  73       _mesa_update_state(ctx);
  74    }
  75
  76    if (!valid_fragment_program(ctx)) {
  77       _mesa_error(ctx, GL_INVALID_OPERATION,
  78                   "glDrawPixels (invalid fragment program)");
  79       goto end;
  80    }
  81
  82    if (_mesa_error_check_format_type(ctx, format, type, GL_TRUE)) {
  83       /* the error was already recorded */
  84       goto end;
  85    }
  86
  87    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  88       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
  89                   "glDrawPixels(incomplete framebuffer)" );
  90       goto end;
  91    }
  92
  93    if (!ctx->Current.RasterPosValid) {
  94       goto end; /* no-op, not an error */
  95    }
  96
  97    if (ctx->RenderMode == GL_RENDER) {
  98       if (width > 0 && height > 0) {
  99          /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
 100          GLint x = IROUND(ctx->Current.RasterPos[0]);
 101          GLint y = IROUND(ctx->Current.RasterPos[1]);
 102
 103          if (ctx->Unpack.BufferObj->Name) {
 104             /* unpack from PBO */
 105             if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height, 1,
 106                                            format, type, pixels)) {
 107                _mesa_error(ctx, GL_INVALID_OPERATION,
 108                            "glDrawPixels(invalid PBO access)");
 109                goto end;
 110             }
 111             if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
 112                /* buffer is mapped - that's an error */
 113                _mesa_error(ctx, GL_INVALID_OPERATION,
 114                            "glDrawPixels(PBO is mapped)");
 115                goto end;
 116             }
 117          }
 118
 119          ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
 120                                 &ctx->Unpack, pixels);
 121       }
 122    }
 123    else if (ctx->RenderMode == GL_FEEDBACK) {
 124       /* Feedback the current raster pos info */
 125       FLUSH_CURRENT( ctx, 0 );
 126       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
 127       _mesa_feedback_vertex( ctx,
 128                              ctx->Current.RasterPos,
 129                              ctx->Current.RasterColor,
 130                              ctx->Current.RasterTexCoords[0] );
 131    }
 132    else {
 133       ASSERT(ctx->RenderMode == GL_SELECT);
 134       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 135    }
 136
 137 end:
 138    _mesa_set_vp_override(ctx, GL_FALSE);
 139 }
 140
 141
 142 static void GLAPIENTRY
 143 _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 144                   GLenum type )
 145 {
 146    GET_CURRENT_CONTEXT(ctx);
 147    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 148
 149    if (width < 0 || height < 0) {
 150       _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
 151       return;
 152    }
 153
 154    /* Note: more detailed 'type' checking is done by the
 155     * _mesa_source/dest_buffer_exists() calls below.  That's where we
 156     * check if the stencil buffer exists, etc.
 157     */
 158    if (type != GL_COLOR &&
 159        type != GL_DEPTH &&
 160        type != GL_STENCIL &&
 161        type != GL_DEPTH_STENCIL) {
 162       _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
 163                   _mesa_lookup_enum_by_nr(type));
 164       return;
 165    }
 166
 167    /* We're not using the current vertex program, and the driver may install
 168     * it's own.
 169     */
 170    _mesa_set_vp_override(ctx, GL_TRUE);
 171
 172    if (ctx->NewState) {
 173       _mesa_update_state(ctx);
 174    }
 175
 176    if (!valid_fragment_program(ctx)) {
 177       _mesa_error(ctx, GL_INVALID_OPERATION,
 178                   "glCopyPixels (invalid fragment program)");
 179       goto end;
 180    }
 181
 182    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
 183        ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 184       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
 185                   "glCopyPixels(incomplete framebuffer)" );
 186       goto end;
 187    }
 188
 189    if (!_mesa_source_buffer_exists(ctx, type) ||
 190        !_mesa_dest_buffer_exists(ctx, type)) {
 191       _mesa_error(ctx, GL_INVALID_OPERATION,
 192                   "glCopyPixels(missing source or dest buffer)");
 193       goto end;
 194    }
 195
 196    if (!ctx->Current.RasterPosValid || width ==0 || height == 0) {
 197       goto end; /* no-op, not an error */
 198    }
 199
 200    if (ctx->RenderMode == GL_RENDER) {
 201       /* Round to satisfy conformance tests (matches SGI's OpenGL) */
 202       if (width > 0 && height > 0) {
 203          GLint destx = IROUND(ctx->Current.RasterPos[0]);
 204          GLint desty = IROUND(ctx->Current.RasterPos[1]);
 205          ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
 206                                  type );
 207       }
 208    }
 209    else if (ctx->RenderMode == GL_FEEDBACK) {
 210       FLUSH_CURRENT( ctx, 0 );
 211       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
 212       _mesa_feedback_vertex( ctx,
 213                              ctx->Current.RasterPos,
 214                              ctx->Current.RasterColor,
 215                              ctx->Current.RasterTexCoords[0] );
 216    }
 217    else {
 218       ASSERT(ctx->RenderMode == GL_SELECT);
 219       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 220    }
 221
 222 end:
 223    _mesa_set_vp_override(ctx, GL_FALSE);
 224 }
 225
 226
 227 static void GLAPIENTRY
 228 _mesa_Bitmap( GLsizei width, GLsizei height,
 229               GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
 230               const GLubyte *bitmap )
 231 {
 232    GET_CURRENT_CONTEXT(ctx);
 233    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 234
 235    if (width < 0 || height < 0) {
 236       _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
 237       return;
 238    }
 239
 240    if (!ctx->Current.RasterPosValid) {
 241       return;    /* do nothing */
 242    }
 243
 244    if (ctx->NewState) {
 245       _mesa_update_state(ctx);
 246    }
 247
 248    if (!valid_fragment_program(ctx)) {
 249       _mesa_error(ctx, GL_INVALID_OPERATION,
 250                   "glBitmap (invalid fragment program)");
 251       return;
 252    }
 253
 254    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 255       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
 256                   "glBitmap(incomplete framebuffer)");
 257       return;
 258    }
 259
 260    if (ctx->RenderMode == GL_RENDER) {
 261       /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
 262       if (width > 0 && height > 0) {
 263          const GLfloat epsilon = 0.0001F;
 264          GLint x = IFLOOR(ctx->Current.RasterPos[0] + epsilon - xorig);
 265          GLint y = IFLOOR(ctx->Current.RasterPos[1] + epsilon - yorig);
 266
 267          if (ctx->Unpack.BufferObj->Name) {
 268             /* unpack from PBO */
 269             if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height, 1,
 270                                            GL_COLOR_INDEX, GL_BITMAP,
 271                                            (GLvoid *) bitmap)) {
 272                _mesa_error(ctx, GL_INVALID_OPERATION,
 273                            "glBitmap(invalid PBO access)");
 274                return;
 275             }
 276             if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
 277                /* buffer is mapped - that's an error */
 278                _mesa_error(ctx, GL_INVALID_OPERATION,
 279                            "glBitmap(PBO is mapped)");
 280                return;
 281             }
 282          }
 283
 284          ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
 285       }
 286    }
 287 #if _HAVE_FULL_GL
 288    else if (ctx->RenderMode == GL_FEEDBACK) {
 289       FLUSH_CURRENT(ctx, 0);
 290       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
 291       _mesa_feedback_vertex( ctx,
 292                              ctx->Current.RasterPos,
 293                              ctx->Current.RasterColor,
 294                              ctx->Current.RasterTexCoords[0] );
 295    }
 296    else {
 297       ASSERT(ctx->RenderMode == GL_SELECT);
 298       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 299    }
 300 #endif
 301
 302    /* update raster position */
 303    ctx->Current.RasterPos[0] += xmove;
 304    ctx->Current.RasterPos[1] += ymove;
 305 }
 306
 307
 308 void
 309 _mesa_init_drawpix_dispatch(struct _glapi_table *disp)
 310 {
 311    SET_Bitmap(disp, _mesa_Bitmap);
 312    SET_CopyPixels(disp, _mesa_CopyPixels);
 313    SET_DrawPixels(disp, _mesa_DrawPixels);
 314 }
 315
 316
 317 #endif /* FEATURE_drawpix */