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