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 "image.h"
  34 #include "readpix.h"
  35 #include "shaderobj.h"
  36 #include "state.h"
  37 #include "dispatch.h"
  38
  39
  40 #if FEATURE_drawpix
  41
  42
  43 /**
  44  * If a fragment program is enabled, check that it's valid.
  45  * \return GL_TRUE if valid, GL_FALSE otherwise
  46  */
  47 static GLboolean
  48 valid_fragment_program(struct gl_context *ctx)
  49 {
  50    return !(ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled);
  51 }
  52
  53
  54 /*
  55  * Execute glDrawPixels
  56  */
  57 static void GLAPIENTRY
  58 _mesa_DrawPixels( GLsizei width, GLsizei height,
  59                   GLenum format, GLenum type, const GLvoid *pixels )
  60 {
  61    GET_CURRENT_CONTEXT(ctx);
  62    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  63
  64    if (width < 0 || height < 0) {
  65       _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
  66       return;
  67    }
  68
  69    /* We're not using the current vertex program, and the driver may install
  70     * it's own.
  71     */
  72    _mesa_set_vp_override(ctx, GL_TRUE);
  73
  74    if (ctx->NewState) {
  75       _mesa_update_state(ctx);
  76    }
  77
  78    if (!valid_fragment_program(ctx)) {
  79       _mesa_error(ctx, GL_INVALID_OPERATION,
  80                   "glDrawPixels (invalid fragment program)");
  81       goto end;
  82    }
  83
  84    if (_mesa_error_check_format_type(ctx, format, type, GL_TRUE)) {
  85       /* the error was already recorded */
  86       goto end;
  87    }
  88
  89    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  90       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
  91                   "glDrawPixels(incomplete framebuffer)" );
  92       goto end;
  93    }
  94
  95    if (!ctx->Current.RasterPosValid) {
  96       goto end; /* no-op, not an error */
  97    }
  98
  99    if (_mesa_is_integer_format(format) &&
 100        !_mesa_is_fragment_shader_active(ctx)) {
 101       /* A fragment shader is required when drawing integer formats */
 102       _mesa_error(ctx, GL_INVALID_OPERATION,
 103                   "glDrawPixels(integer format but no fragment shader)");
 104       goto end;
 105    }
 106
 107    if (ctx->RenderMode == GL_RENDER) {
 108       if (width > 0 && height > 0) {
 109          /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
 110          GLint x = IROUND(ctx->Current.RasterPos[0]);
 111          GLint y = IROUND(ctx->Current.RasterPos[1]);
 112
 113          if (ctx->Unpack.BufferObj->Name) {
 114             /* unpack from PBO */
 115             if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height, 1,
 116                                            format, type, pixels)) {
 117                _mesa_error(ctx, GL_INVALID_OPERATION,
 118                            "glDrawPixels(invalid PBO access)");
 119                goto end;
 120             }
 121             if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
 122                /* buffer is mapped - that's an error */
 123                _mesa_error(ctx, GL_INVALID_OPERATION,
 124                            "glDrawPixels(PBO is mapped)");
 125                goto end;
 126             }
 127          }
 128
 129          ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
 130                                 &ctx->Unpack, pixels);
 131       }
 132    }
 133    else if (ctx->RenderMode == GL_FEEDBACK) {
 134       /* Feedback the current raster pos info */
 135       FLUSH_CURRENT( ctx, 0 );
 136       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
 137       _mesa_feedback_vertex( ctx,
 138                              ctx->Current.RasterPos,
 139                              ctx->Current.RasterColor,
 140                              ctx->Current.RasterTexCoords[0] );
 141    }
 142    else {
 143       ASSERT(ctx->RenderMode == GL_SELECT);
 144       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 145    }
 146
 147 end:
 148    _mesa_set_vp_override(ctx, GL_FALSE);
 149 }
 150
 151
 152 static void GLAPIENTRY
 153 _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 154                   GLenum type )
 155 {
 156    GET_CURRENT_CONTEXT(ctx);
 157    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 158
 159    if (width < 0 || height < 0) {
 160       _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
 161       return;
 162    }
 163
 164    /* Note: more detailed 'type' checking is done by the
 165     * _mesa_source/dest_buffer_exists() calls below.  That's where we
 166     * check if the stencil buffer exists, etc.
 167     */
 168    if (type != GL_COLOR &&
 169        type != GL_DEPTH &&
 170        type != GL_STENCIL &&
 171        type != GL_DEPTH_STENCIL) {
 172       _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
 173                   _mesa_lookup_enum_by_nr(type));
 174       return;
 175    }
 176
 177    /* We're not using the current vertex program, and the driver may install
 178     * it's own.
 179     */
 180    _mesa_set_vp_override(ctx, GL_TRUE);
 181
 182    if (ctx->NewState) {
 183       _mesa_update_state(ctx);
 184    }
 185
 186    if (!valid_fragment_program(ctx)) {
 187       _mesa_error(ctx, GL_INVALID_OPERATION,
 188                   "glCopyPixels (invalid fragment program)");
 189       goto end;
 190    }
 191
 192    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
 193        ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 194       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
 195                   "glCopyPixels(incomplete framebuffer)" );
 196       goto end;
 197    }
 198
 199    if (!_mesa_source_buffer_exists(ctx, type) ||
 200        !_mesa_dest_buffer_exists(ctx, type)) {
 201       _mesa_error(ctx, GL_INVALID_OPERATION,
 202                   "glCopyPixels(missing source or dest buffer)");
 203       goto end;
 204    }
 205
 206    if (!ctx->Current.RasterPosValid || width ==0 || height == 0) {
 207       goto end; /* no-op, not an error */
 208    }
 209
 210    if (ctx->RenderMode == GL_RENDER) {
 211       /* Round to satisfy conformance tests (matches SGI's OpenGL) */
 212       if (width > 0 && height > 0) {
 213          GLint destx = IROUND(ctx->Current.RasterPos[0]);
 214          GLint desty = IROUND(ctx->Current.RasterPos[1]);
 215          ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
 216                                  type );
 217       }
 218    }
 219    else if (ctx->RenderMode == GL_FEEDBACK) {
 220       FLUSH_CURRENT( ctx, 0 );
 221       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
 222       _mesa_feedback_vertex( ctx,
 223                              ctx->Current.RasterPos,
 224                              ctx->Current.RasterColor,
 225                              ctx->Current.RasterTexCoords[0] );
 226    }
 227    else {
 228       ASSERT(ctx->RenderMode == GL_SELECT);
 229       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 230    }
 231
 232 end:
 233    _mesa_set_vp_override(ctx, GL_FALSE);
 234 }
 235
 236
 237 static void GLAPIENTRY
 238 _mesa_Bitmap( GLsizei width, GLsizei height,
 239               GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
 240               const GLubyte *bitmap )
 241 {
 242    GET_CURRENT_CONTEXT(ctx);
 243    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 244
 245    if (width < 0 || height < 0) {
 246       _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
 247       return;
 248    }
 249
 250    if (!ctx->Current.RasterPosValid) {
 251       return;    /* do nothing */
 252    }
 253
 254    if (ctx->NewState) {
 255       _mesa_update_state(ctx);
 256    }
 257
 258    if (!valid_fragment_program(ctx)) {
 259       _mesa_error(ctx, GL_INVALID_OPERATION,
 260                   "glBitmap (invalid fragment program)");
 261       return;
 262    }
 263
 264    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 265       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
 266                   "glBitmap(incomplete framebuffer)");
 267       return;
 268    }
 269
 270    if (ctx->RenderMode == GL_RENDER) {
 271       /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
 272       if (width > 0 && height > 0) {
 273          const GLfloat epsilon = 0.0001F;
 274          GLint x = IFLOOR(ctx->Current.RasterPos[0] + epsilon - xorig);
 275          GLint y = IFLOOR(ctx->Current.RasterPos[1] + epsilon - yorig);
 276
 277          if (ctx->Unpack.BufferObj->Name) {
 278             /* unpack from PBO */
 279             if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height, 1,
 280                                            GL_COLOR_INDEX, GL_BITMAP,
 281                                            (GLvoid *) bitmap)) {
 282                _mesa_error(ctx, GL_INVALID_OPERATION,
 283                            "glBitmap(invalid PBO access)");
 284                return;
 285             }
 286             if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
 287                /* buffer is mapped - that's an error */
 288                _mesa_error(ctx, GL_INVALID_OPERATION,
 289                            "glBitmap(PBO is mapped)");
 290                return;
 291             }
 292          }
 293
 294          ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
 295       }
 296    }
 297 #if _HAVE_FULL_GL
 298    else if (ctx->RenderMode == GL_FEEDBACK) {
 299       FLUSH_CURRENT(ctx, 0);
 300       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
 301       _mesa_feedback_vertex( ctx,
 302                              ctx->Current.RasterPos,
 303                              ctx->Current.RasterColor,
 304                              ctx->Current.RasterTexCoords[0] );
 305    }
 306    else {
 307       ASSERT(ctx->RenderMode == GL_SELECT);
 308       /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
 309    }
 310 #endif
 311
 312    /* update raster position */
 313    ctx->Current.RasterPos[0] += xmove;
 314    ctx->Current.RasterPos[1] += ymove;
 315 }
 316
 317
 318 void
 319 _mesa_init_drawpix_dispatch(struct _glapi_table *disp)
 320 {
 321    SET_Bitmap(disp, _mesa_Bitmap);
 322    SET_CopyPixels(disp, _mesa_CopyPixels);
 323    SET_DrawPixels(disp, _mesa_DrawPixels);
 324 }
 325
 326
 327 #endif /* FEATURE_drawpix */