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/teximage.h"
  33 #include "main/texenv.h"
  34 #include "main/texobj.h"
  35 #include "main/texstate.h"
  36 #include "main/texparam.h"
  37 #include "main/varray.h"
  38 #include "main/attrib.h"
  39 #include "main/enable.h"
  40 #include "main/buffers.h"
  41 #include "main/fbobject.h"
  42 #include "main/depth.h"
  43 #include "main/hash.h"
  44 #include "main/blend.h"
  45 #include "swrast/swrast.h"
  46 #include "drivers/common/meta.h"
  47
  48 #include "intel_context.h"
  49 #include "intel_batchbuffer.h"
  50 #include "intel_blit.h"
  51 #include "intel_buffers.h"
  52 #include "intel_regions.h"
  53 #include "intel_pixel.h"
  54 #include "intel_fbo.h"
  55
  56
  57 /** XXX compare perf of this vs. _mesa_meta_DrawPixels(STENCIL) */
  58 static GLboolean
  59 intel_stencil_drawpixels(GLcontext * ctx,
  60                          GLint x, GLint y,
  61                          GLsizei width, GLsizei height,
  62                          GLenum format,
  63                          GLenum type,
  64                          const struct gl_pixelstore_attrib *unpack,
  65                          const GLvoid *pixels)
  66 {
  67    struct intel_context *intel = intel_context(ctx);
  68    GLuint texname, rb_name, fb_name, old_fb_name;
  69    GLfloat vertices[4][2];
  70    struct intel_renderbuffer *irb;
  71    struct intel_renderbuffer *depth_irb;
  72    struct gl_renderbuffer *rb;
  73    struct gl_pixelstore_attrib old_unpack;
  74    GLstencil *stencil_pixels;
  75    int row, y1, y2;
  76    GLint old_active_texture;
  77    GLboolean rendering_to_fbo = ctx->DrawBuffer->Name != 0;
  78
  79    if (format != GL_STENCIL_INDEX)
  80       return GL_FALSE;
  81
  82    /* If there's nothing to write, we're done. */
  83    if (ctx->Stencil.WriteMask[0] == 0)
  84       return GL_TRUE;
  85
  86    /* Can't do a per-bit writemask while treating stencil as rgba data. */
  87    if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
  88       if (INTEL_DEBUG & DEBUG_FALLBACKS)
  89          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
  90                  "stencil mask enabled\n");
  91       return GL_FALSE;
  92    }
  93
  94    /* We don't support stencil testing/ops here */
  95    if (ctx->Stencil._Enabled)
  96       return GL_FALSE;
  97
  98    /* We use FBOs for our wrapping of the depthbuffer into a color
  99     * destination.
 100     */
 101    if (!ctx->Extensions.EXT_framebuffer_object)
 102       return GL_FALSE;
 103
 104    /* We're going to mess with texturing with no regard to existing texture
 105     * state, so if there is some set up we have to bail.
 106     */
 107    if (ctx->Texture._EnabledUnits != 0) {
 108       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 109          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 110                  "texturing enabled\n");
 111       return GL_FALSE;
 112    }
 113
 114    /* Can't do textured DrawPixels with a fragment program, unless we were
 115     * to generate a new program that sampled our texture and put the results
 116     * in the fragment color before the user's program started.
 117     */
 118    if (ctx->FragmentProgram.Enabled) {
 119       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 120          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 121                  "fragment program enabled\n");
 122       return GL_FALSE;
 123    }
 124
 125    /* Check that we can load in a texture this big. */
 126    if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
 127        height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
 128       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 129          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 130                  "bitmap too large (%dx%d)\n",
 131                  width, height);
 132       return GL_FALSE;
 133    }
 134
 135    if (!ctx->Extensions.ARB_texture_non_power_of_two &&
 136        (!is_power_of_two(width) || !is_power_of_two(height))) {
 137       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 138          fprintf(stderr,
 139                  "glDrawPixels(GL_STENCIL_INDEX) fallback: NPOT texture\n");
 140       return GL_FALSE;
 141    }
 142
 143    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
 144                     GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 145    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 146    old_fb_name = ctx->DrawBuffer->Name;
 147    old_active_texture = ctx->Texture.CurrentUnit;
 148
 149    _mesa_Disable(GL_POLYGON_STIPPLE);
 150    _mesa_Disable(GL_DEPTH_TEST);
 151    _mesa_Disable(GL_STENCIL_TEST);
 152
 153    /* Unpack the supplied stencil values into a ubyte buffer. */
 154    assert(sizeof(GLstencil) == sizeof(GLubyte));
 155    stencil_pixels = _mesa_malloc(width * height * sizeof(GLstencil));
 156    for (row = 0; row < height; row++) {
 157       GLvoid *source = _mesa_image_address2d(unpack, pixels,
 158                                              width, height,
 159                                              GL_COLOR_INDEX, type,
 160                                              row, 0);
 161       _mesa_unpack_stencil_span(ctx, width, GL_UNSIGNED_BYTE,
 162                                 stencil_pixels +
 163                                 row * width * sizeof(GLstencil),
 164                                 type, source, unpack, ctx->_ImageTransferState);
 165    }
 166
 167    /* Take the current depth/stencil renderbuffer, and make a new one wrapping
 168     * it which will be treated as GL_RGBA8 so we can render to it as a color
 169     * buffer.
 170     */
 171    depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
 172    irb = intel_create_renderbuffer(MESA_FORMAT_ARGB8888);
 173    rb = &irb->Base;
 174    irb->Base.Width = depth_irb->Base.Width;
 175    irb->Base.Height = depth_irb->Base.Height;
 176    intel_renderbuffer_set_region(irb, depth_irb->region);
 177
 178    /* Create a name for our renderbuffer, which lets us use other mesa
 179     * rb functions for convenience.
 180     */
 181    _mesa_GenRenderbuffersEXT(1, &rb_name);
 182    irb->Base.RefCount++;
 183    _mesa_HashInsert(ctx->Shared->RenderBuffers, rb_name, &irb->Base);
 184
 185    /* Bind the new renderbuffer to the color attachment point. */
 186    _mesa_GenFramebuffersEXT(1, &fb_name);
 187    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb_name);
 188    _mesa_FramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
 189                                     GL_COLOR_ATTACHMENT0_EXT,
 190                                     GL_RENDERBUFFER_EXT,
 191                                     rb_name);
 192    /* Choose to render to the color attachment. */
 193    _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
 194
 195    _mesa_DepthMask(GL_FALSE);
 196    _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
 197
 198    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 199    _mesa_Enable(GL_TEXTURE_2D);
 200    _mesa_GenTextures(1, &texname);
 201    _mesa_BindTexture(GL_TEXTURE_2D, texname);
 202    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 203    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 204    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 205    old_unpack = ctx->Unpack;
 206    ctx->Unpack = ctx->DefaultPacking;
 207    _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0,
 208                     GL_RED, GL_UNSIGNED_BYTE, stencil_pixels);
 209    ctx->Unpack = old_unpack;
 210    _mesa_free(stencil_pixels);
 211
 212    meta_set_passthrough_transform(&intel->meta);
 213
 214    /* Since we're rendering to the framebuffer as if it was an FBO,
 215     * if it's the window system we have to flip the coordinates.
 216     */
 217    if (rendering_to_fbo) {
 218       y1 = y;
 219       y2 = y + height * ctx->Pixel.ZoomY;
 220    } else {
 221       y1 = irb->Base.Height - (y + height * ctx->Pixel.ZoomY);
 222       y2 = irb->Base.Height - y;
 223    }
 224    vertices[0][0] = x;
 225    vertices[0][1] = y1;
 226    vertices[1][0] = x + width * ctx->Pixel.ZoomX;
 227    vertices[1][1] = y1;
 228    vertices[2][0] = x + width * ctx->Pixel.ZoomX;
 229    vertices[2][1] = y2;
 230    vertices[3][0] = x;
 231    vertices[3][1] = y2;
 232
 233    _mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
 234    _mesa_Enable(GL_VERTEX_ARRAY);
 235    meta_set_default_texrect(&intel->meta);
 236
 237    _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 238
 239    meta_restore_texcoords(&intel->meta);
 240    meta_restore_transform(&intel->meta);
 241
 242    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + old_active_texture);
 243    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, old_fb_name);
 244
 245    _mesa_PopClientAttrib();
 246    _mesa_PopAttrib();
 247
 248    _mesa_DeleteTextures(1, &texname);
 249    _mesa_DeleteFramebuffersEXT(1, &fb_name);
 250    _mesa_DeleteRenderbuffersEXT(1, &rb_name);
 251
 252    return GL_TRUE;
 253 }
 254
 255 void
 256 intelDrawPixels(GLcontext * ctx,
 257                 GLint x, GLint y,
 258                 GLsizei width, GLsizei height,
 259                 GLenum format,
 260                 GLenum type,
 261                 const struct gl_pixelstore_attrib *unpack,
 262                 const GLvoid * pixels)
 263 {
 264 #if 0
 265    /* XXX this function doesn't seem to work reliably even when all
 266     * the pre-requisite conditions are met.
 267     * Note that this function is never hit with conform.
 268     * Fall back to swrast because even the _mesa_meta_DrawPixels() approach
 269     * isn't working because of an apparent stencil bug.
 270     */
 271    if (intel_stencil_drawpixels(ctx, x, y, width, height, format, type,
 272                                 unpack, pixels))
 273       return;
 274 #else
 275    (void) intel_stencil_drawpixels; /* silence warning */
 276    if (format == GL_STENCIL_INDEX) {
 277       _swrast_DrawPixels(ctx, x, y, width, height, format, type,
 278                          unpack, pixels);
 279       return;
 280    }
 281 #endif
 282
 283    _mesa_meta_DrawPixels(ctx, x, y, width, height, format, type,
 284                          unpack, pixels);
 285 }