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