src/mesa/drivers/dri/intel/intel_pixel_draw.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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 portionsalloc
  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 #include "main/glheader.h"
  29 #include "main/enums.h"
  30 #include "main/image.h"
  31 #include "main/mtypes.h"
  32 #include "main/macros.h"
  33 #include "main/bufferobj.h"
  34 #include "main/teximage.h"
  35 #include "main/texenv.h"
  36 #include "main/texobj.h"
  37 #include "main/texstate.h"
  38 #include "main/texparam.h"
  39 #include "main/varray.h"
  40 #include "main/attrib.h"
  41 #include "main/enable.h"
  42 #include "main/buffers.h"
  43 #include "main/fbobject.h"
  44 #include "main/renderbuffer.h"
  45 #include "main/depth.h"
  46 #include "main/hash.h"
  47 #include "main/blend.h"
  48 #include "glapi/dispatch.h"
  49 #include "swrast/swrast.h"
  50
  51 #include "intel_screen.h"
  52 #include "intel_context.h"
  53 #include "intel_batchbuffer.h"
  54 #include "intel_blit.h"
  55 #include "intel_buffers.h"
  56 #include "intel_regions.h"
  57 #include "intel_pixel.h"
  58 #include "intel_buffer_objects.h"
  59 #include "intel_fbo.h"
  60
  61 static GLboolean
  62 intel_texture_drawpixels(GLcontext * ctx,
  63                          GLint x, GLint y,
  64                          GLsizei width, GLsizei height,
  65                          GLenum format,
  66                          GLenum type,
  67                          const struct gl_pixelstore_attrib *unpack,
  68                          const GLvoid *pixels)
  69 {
  70    struct intel_context *intel = intel_context(ctx);
  71    GLuint texname;
  72    GLfloat vertices[4][4];
  73    GLfloat texcoords[4][2];
  74    GLfloat z;
  75
  76    /* We're going to mess with texturing with no regard to existing texture
  77     * state, so if there is some set up we have to bail.
  78     */
  79    if (ctx->Texture._EnabledUnits != 0) {
  80       if (INTEL_DEBUG & DEBUG_FALLBACKS)
  81          fprintf(stderr, "glDrawPixels() fallback: texturing enabled\n");
  82       return GL_FALSE;
  83    }
  84
  85    /* Can't do textured DrawPixels with a fragment program, unless we were
  86     * to generate a new program that sampled our texture and put the results
  87     * in the fragment color before the user's program started.
  88     */
  89    if (ctx->FragmentProgram.Enabled) {
  90       if (INTEL_DEBUG & DEBUG_FALLBACKS)
  91          fprintf(stderr, "glDrawPixels() fallback: fragment program enabled\n");
  92       return GL_FALSE;
  93    }
  94
  95    /* We don't have a way to generate fragments with stencil values which
  96     * will set the resulting stencil value.
  97     */
  98    if (format == GL_STENCIL_INDEX)
  99       return GL_FALSE;
 100
 101    /* Check that we can load in a texture this big. */
 102    if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
 103        height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
 104       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 105          fprintf(stderr, "glDrawPixels() fallback: bitmap too large (%dx%d)\n",
 106                  width, height);
 107       return GL_FALSE;
 108    }
 109
 110    /* To do DEPTH_COMPONENT, we would need to change our setup to not draw to
 111     * the color buffer, and sample the texture values into the fragment depth
 112     * in a program.
 113     */
 114    if (format == GL_DEPTH_COMPONENT) {
 115       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 116          fprintf(stderr,
 117                  "glDrawPixels() fallback: format == GL_DEPTH_COMPONENT\n");
 118       return GL_FALSE;
 119    }
 120
 121    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
 122                     GL_CURRENT_BIT);
 123    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 124
 125    /* XXX: pixel store stuff */
 126    _mesa_Disable(GL_POLYGON_STIPPLE);
 127
 128    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 129    _mesa_Enable(GL_TEXTURE_2D);
 130    _mesa_GenTextures(1, &texname);
 131    _mesa_BindTexture(GL_TEXTURE_2D, texname);
 132    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 133    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 134    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 135    /*
 136    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
 137    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
 138    */
 139    _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, format,
 140                     type, pixels);
 141
 142    intel_meta_set_passthrough_transform(intel);
 143
 144    /* convert rasterpos Z from [0,1] to NDC coord in [-1,1] */
 145    z = -1.0 + 2.0 * ctx->Current.RasterPos[2];
 146
 147    /* Create the vertex buffer based on the current raster pos.  The x and y
 148     * we're handed are ctx->Current.RasterPos[0,1] rounded to integers.
 149     * We also apply the depth.  However, the W component is already multiplied
 150     * into ctx->Current.RasterPos[0,1,2] and we can ignore it at this point.
 151     */
 152    vertices[0][0] = x;
 153    vertices[0][1] = y;
 154    vertices[0][2] = z;
 155    vertices[0][3] = 1.0;
 156    vertices[1][0] = x + width * ctx->Pixel.ZoomX;
 157    vertices[1][1] = y;
 158    vertices[1][2] = z;
 159    vertices[1][3] = 1.0;
 160    vertices[2][0] = x + width * ctx->Pixel.ZoomX;
 161    vertices[2][1] = y + height * ctx->Pixel.ZoomY;
 162    vertices[2][2] = z;
 163    vertices[2][3] = 1.0;
 164    vertices[3][0] = x;
 165    vertices[3][1] = y + height * ctx->Pixel.ZoomY;
 166    vertices[3][2] = z;
 167    vertices[3][3] = 1.0;
 168
 169    texcoords[0][0] = 0.0;
 170    texcoords[0][1] = 0.0;
 171    texcoords[1][0] = 1.0;
 172    texcoords[1][1] = 0.0;
 173    texcoords[2][0] = 1.0;
 174    texcoords[2][1] = 1.0;
 175    texcoords[3][0] = 0.0;
 176    texcoords[3][1] = 1.0;
 177
 178    _mesa_VertexPointer(4, GL_FLOAT, 4 * sizeof(GLfloat), &vertices);
 179    _mesa_TexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &texcoords);
 180    _mesa_Enable(GL_VERTEX_ARRAY);
 181    _mesa_Enable(GL_TEXTURE_COORD_ARRAY);
 182    CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));
 183
 184    intel_meta_restore_transform(intel);
 185    _mesa_PopClientAttrib();
 186    _mesa_PopAttrib();
 187
 188    _mesa_DeleteTextures(1, &texname);
 189
 190    return GL_TRUE;
 191 }
 192
 193 static GLboolean
 194 intel_stencil_drawpixels(GLcontext * ctx,
 195                          GLint x, GLint y,
 196                          GLsizei width, GLsizei height,
 197                          GLenum format,
 198                          GLenum type,
 199                          const struct gl_pixelstore_attrib *unpack,
 200                          const GLvoid *pixels)
 201 {
 202    struct intel_context *intel = intel_context(ctx);
 203    GLuint texname, rb_name, fb_name, old_fb_name;
 204    GLfloat vertices[4][2];
 205    GLfloat texcoords[4][2];
 206    struct intel_renderbuffer *irb;
 207    struct intel_renderbuffer *depth_irb;
 208    struct gl_renderbuffer *rb;
 209    struct gl_pixelstore_attrib old_unpack;
 210    GLstencil *stencil_pixels;
 211    int row;
 212
 213    if (format != GL_STENCIL_INDEX)
 214       return GL_FALSE;
 215
 216    /* If there's nothing to write, we're done. */
 217    if (ctx->Stencil.WriteMask[0] == 0)
 218       return GL_TRUE;
 219
 220    /* Can't do a per-bit writemask while treating stencil as rgba data. */
 221    if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 222       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 223          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 224                  "stencil mask enabled\n");
 225       return GL_FALSE;
 226    }
 227
 228    /* We don't support stencil testing/ops here */
 229    if (ctx->Stencil.Enabled)
 230       return GL_FALSE;
 231
 232    /* We use FBOs for our wrapping of the depthbuffer into a color
 233     * destination.
 234     */
 235    if (!ctx->Extensions.EXT_framebuffer_object)
 236       return GL_FALSE;
 237
 238    /* We're going to mess with texturing with no regard to existing texture
 239     * state, so if there is some set up we have to bail.
 240     */
 241    if (ctx->Texture._EnabledUnits != 0) {
 242       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 243          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 244                  "texturing enabled\n");
 245       return GL_FALSE;
 246    }
 247
 248    /* Can't do textured DrawPixels with a fragment program, unless we were
 249     * to generate a new program that sampled our texture and put the results
 250     * in the fragment color before the user's program started.
 251     */
 252    if (ctx->FragmentProgram.Enabled) {
 253       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 254          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 255                  "fragment program enabled\n");
 256       return GL_FALSE;
 257    }
 258
 259    /* Check that we can load in a texture this big. */
 260    if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
 261        height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
 262       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 263          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 264                  "bitmap too large (%dx%d)\n",
 265                  width, height);
 266       return GL_FALSE;
 267    }
 268
 269    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
 270                     GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 271    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 272    old_fb_name = ctx->DrawBuffer->Name;
 273
 274    _mesa_Disable(GL_POLYGON_STIPPLE);
 275    _mesa_Disable(GL_DEPTH_TEST);
 276    _mesa_Disable(GL_STENCIL_TEST);
 277
 278    /* Unpack the supplied stencil values into a ubyte buffer. */
 279    assert(sizeof(GLstencil) == sizeof(GLubyte));
 280    stencil_pixels = _mesa_malloc(width * height * sizeof(GLstencil));
 281    for (row = 0; row < height; row++) {
 282       GLvoid *source = _mesa_image_address2d(unpack, pixels,
 283                                              width, height,
 284                                              GL_COLOR_INDEX, type,
 285                                              row, 0);
 286       _mesa_unpack_stencil_span(ctx, width, GL_UNSIGNED_BYTE,
 287                                 stencil_pixels +
 288                                 row * width * sizeof(GLstencil),
 289                                 type, source, unpack, ctx->_ImageTransferState);
 290    }
 291
 292    /* Take the current depth/stencil renderbuffer, and make a new one wrapping
 293     * it which will be treated as GL_RGBA8 so we can render to it as a color
 294     * buffer.
 295     */
 296    depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
 297    irb = intel_create_renderbuffer(GL_RGBA8);
 298    rb = &irb->Base;
 299    irb->Base.Width = depth_irb->Base.Width;
 300    irb->Base.Height = depth_irb->Base.Height;
 301    intel_renderbuffer_set_region(irb, depth_irb->region);
 302
 303    /* Create a name for our renderbuffer, which lets us use other mesa
 304     * rb functions for convenience.
 305     */
 306    _mesa_GenRenderbuffersEXT(1, &rb_name);
 307    irb->Base.RefCount++;
 308    _mesa_HashInsert(ctx->Shared->RenderBuffers, rb_name, &irb->Base);
 309
 310    /* Bind the new renderbuffer to the color attachment point. */
 311    _mesa_GenFramebuffersEXT(1, &fb_name);
 312    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb_name);
 313    _mesa_FramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
 314                                     GL_COLOR_ATTACHMENT0_EXT,
 315                                     GL_RENDERBUFFER_EXT,
 316                                     rb_name);
 317    /* Choose to render to the color attachment. */
 318    _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
 319
 320    _mesa_DepthMask(GL_FALSE);
 321    _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
 322
 323    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 324    _mesa_Enable(GL_TEXTURE_2D);
 325    _mesa_GenTextures(1, &texname);
 326    _mesa_BindTexture(GL_TEXTURE_2D, texname);
 327    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 328    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 329    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 330    old_unpack = ctx->Unpack;
 331    ctx->Unpack = ctx->DefaultPacking;
 332    _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0,
 333                     GL_RED, GL_UNSIGNED_BYTE, stencil_pixels);
 334    ctx->Unpack = old_unpack;
 335    _mesa_free(stencil_pixels);
 336
 337    intel_meta_set_passthrough_transform(intel);
 338
 339    vertices[0][0] = x;
 340    vertices[0][1] = y;
 341    vertices[1][0] = x + width * ctx->Pixel.ZoomX;
 342    vertices[1][1] = y;
 343    vertices[2][0] = x + width * ctx->Pixel.ZoomX;
 344    vertices[2][1] = y + height * ctx->Pixel.ZoomY;
 345    vertices[3][0] = x;
 346    vertices[3][1] = y + height * ctx->Pixel.ZoomY;
 347
 348    texcoords[0][0] = 0.0;
 349    texcoords[0][1] = 0.0;
 350    texcoords[1][0] = 1.0;
 351    texcoords[1][1] = 0.0;
 352    texcoords[2][0] = 1.0;
 353    texcoords[2][1] = 1.0;
 354    texcoords[3][0] = 0.0;
 355    texcoords[3][1] = 1.0;
 356
 357    _mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
 358    _mesa_TexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &texcoords);
 359    _mesa_Enable(GL_VERTEX_ARRAY);
 360    _mesa_Enable(GL_TEXTURE_COORD_ARRAY);
 361    CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));
 362
 363    intel_meta_restore_transform(intel);
 364
 365    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, old_fb_name);
 366
 367    _mesa_PopClientAttrib();
 368    _mesa_PopAttrib();
 369
 370    _mesa_DeleteTextures(1, &texname);
 371    _mesa_DeleteFramebuffersEXT(1, &fb_name);
 372    _mesa_DeleteRenderbuffersEXT(1, &rb_name);
 373
 374    return GL_TRUE;
 375 }
 376
 377 void
 378 intelDrawPixels(GLcontext * ctx,
 379                 GLint x, GLint y,
 380                 GLsizei width, GLsizei height,
 381                 GLenum format,
 382                 GLenum type,
 383                 const struct gl_pixelstore_attrib *unpack,
 384                 const GLvoid * pixels)
 385 {
 386    if (intel_texture_drawpixels(ctx, x, y, width, height, format, type,
 387                                 unpack, pixels))
 388       return;
 389
 390    if (intel_stencil_drawpixels(ctx, x, y, width, height, format, type,
 391                                 unpack, pixels))
 392       return;
 393
 394    if (INTEL_DEBUG & DEBUG_PIXEL)
 395       _mesa_printf("%s: fallback to swrast\n", __FUNCTION__);
 396
 397    _swrast_DrawPixels(ctx, x, y, width, height, format, type,
 398                       unpack, pixels);
 399 }