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 "main/viewport.h"
  49 #include "glapi/dispatch.h"
  50 #include "swrast/swrast.h"
  51 #include "drivers/common/meta.h"
  52
  53 #include "intel_screen.h"
  54 #include "intel_context.h"
  55 #include "intel_batchbuffer.h"
  56 #include "intel_blit.h"
  57 #include "intel_buffers.h"
  58 #include "intel_regions.h"
  59 #include "intel_pixel.h"
  60 #include "intel_buffer_objects.h"
  61 #include "intel_fbo.h"
  62
  63
  64 /** XXX compare perf of this vs. _mesa_meta_draw_pixels(STENCIL) */
  65 static GLboolean
  66 intel_stencil_drawpixels(GLcontext * ctx,
  67                          GLint x, GLint y,
  68                          GLsizei width, GLsizei height,
  69                          GLenum format,
  70                          GLenum type,
  71                          const struct gl_pixelstore_attrib *unpack,
  72                          const GLvoid *pixels)
  73 {
  74    struct intel_context *intel = intel_context(ctx);
  75    GLuint texname, rb_name, fb_name, old_fb_name;
  76    GLfloat vertices[4][2];
  77    struct intel_renderbuffer *irb;
  78    struct intel_renderbuffer *depth_irb;
  79    struct gl_renderbuffer *rb;
  80    struct gl_pixelstore_attrib old_unpack;
  81    GLstencil *stencil_pixels;
  82    int row, y1, y2;
  83    GLint old_active_texture;
  84    GLboolean rendering_to_fbo = ctx->DrawBuffer->Name != 0;
  85
  86    if (format != GL_STENCIL_INDEX)
  87       return GL_FALSE;
  88
  89    /* If there's nothing to write, we're done. */
  90    if (ctx->Stencil.WriteMask[0] == 0)
  91       return GL_TRUE;
  92
  93    /* Can't do a per-bit writemask while treating stencil as rgba data. */
  94    if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
  95       if (INTEL_DEBUG & DEBUG_FALLBACKS)
  96          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
  97                  "stencil mask enabled\n");
  98       return GL_FALSE;
  99    }
 100
 101    /* We don't support stencil testing/ops here */
 102    if (ctx->Stencil._Enabled)
 103       return GL_FALSE;
 104
 105    /* We use FBOs for our wrapping of the depthbuffer into a color
 106     * destination.
 107     */
 108    if (!ctx->Extensions.EXT_framebuffer_object)
 109       return GL_FALSE;
 110
 111    /* We're going to mess with texturing with no regard to existing texture
 112     * state, so if there is some set up we have to bail.
 113     */
 114    if (ctx->Texture._EnabledUnits != 0) {
 115       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 116          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 117                  "texturing enabled\n");
 118       return GL_FALSE;
 119    }
 120
 121    /* Can't do textured DrawPixels with a fragment program, unless we were
 122     * to generate a new program that sampled our texture and put the results
 123     * in the fragment color before the user's program started.
 124     */
 125    if (ctx->FragmentProgram.Enabled) {
 126       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 127          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 128                  "fragment program enabled\n");
 129       return GL_FALSE;
 130    }
 131
 132    /* Check that we can load in a texture this big. */
 133    if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
 134        height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
 135       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 136          fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
 137                  "bitmap too large (%dx%d)\n",
 138                  width, height);
 139       return GL_FALSE;
 140    }
 141
 142    if (!ctx->Extensions.ARB_texture_non_power_of_two &&
 143        (!is_power_of_two(width) || !is_power_of_two(height))) {
 144       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 145          fprintf(stderr,
 146                  "glDrawPixels(GL_STENCIL_INDEX) fallback: NPOT texture\n");
 147       return GL_FALSE;
 148    }
 149
 150    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
 151                     GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 152    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 153    old_fb_name = ctx->DrawBuffer->Name;
 154    old_active_texture = ctx->Texture.CurrentUnit;
 155
 156    _mesa_Disable(GL_POLYGON_STIPPLE);
 157    _mesa_Disable(GL_DEPTH_TEST);
 158    _mesa_Disable(GL_STENCIL_TEST);
 159
 160    /* Unpack the supplied stencil values into a ubyte buffer. */
 161    assert(sizeof(GLstencil) == sizeof(GLubyte));
 162    stencil_pixels = _mesa_malloc(width * height * sizeof(GLstencil));
 163    for (row = 0; row < height; row++) {
 164       GLvoid *source = _mesa_image_address2d(unpack, pixels,
 165                                              width, height,
 166                                              GL_COLOR_INDEX, type,
 167                                              row, 0);
 168       _mesa_unpack_stencil_span(ctx, width, GL_UNSIGNED_BYTE,
 169                                 stencil_pixels +
 170                                 row * width * sizeof(GLstencil),
 171                                 type, source, unpack, ctx->_ImageTransferState);
 172    }
 173
 174    /* Take the current depth/stencil renderbuffer, and make a new one wrapping
 175     * it which will be treated as GL_RGBA8 so we can render to it as a color
 176     * buffer.
 177     */
 178    depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
 179    irb = intel_create_renderbuffer(GL_RGBA8);
 180    rb = &irb->Base;
 181    irb->Base.Width = depth_irb->Base.Width;
 182    irb->Base.Height = depth_irb->Base.Height;
 183    intel_renderbuffer_set_region(irb, depth_irb->region);
 184
 185    /* Create a name for our renderbuffer, which lets us use other mesa
 186     * rb functions for convenience.
 187     */
 188    _mesa_GenRenderbuffersEXT(1, &rb_name);
 189    irb->Base.RefCount++;
 190    _mesa_HashInsert(ctx->Shared->RenderBuffers, rb_name, &irb->Base);
 191
 192    /* Bind the new renderbuffer to the color attachment point. */
 193    _mesa_GenFramebuffersEXT(1, &fb_name);
 194    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb_name);
 195    _mesa_FramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
 196                                     GL_COLOR_ATTACHMENT0_EXT,
 197                                     GL_RENDERBUFFER_EXT,
 198                                     rb_name);
 199    /* Choose to render to the color attachment. */
 200    _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
 201
 202    _mesa_DepthMask(GL_FALSE);
 203    _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
 204
 205    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 206    _mesa_Enable(GL_TEXTURE_2D);
 207    _mesa_GenTextures(1, &texname);
 208    _mesa_BindTexture(GL_TEXTURE_2D, texname);
 209    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 210    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 211    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 212    old_unpack = ctx->Unpack;
 213    ctx->Unpack = ctx->DefaultPacking;
 214    _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0,
 215                     GL_RED, GL_UNSIGNED_BYTE, stencil_pixels);
 216    ctx->Unpack = old_unpack;
 217    _mesa_free(stencil_pixels);
 218
 219    meta_set_passthrough_transform(&intel->meta);
 220
 221    /* Since we're rendering to the framebuffer as if it was an FBO,
 222     * if it's the window system we have to flip the coordinates.
 223     */
 224    if (rendering_to_fbo) {
 225       y1 = y;
 226       y2 = y + height * ctx->Pixel.ZoomY;
 227    } else {
 228       y1 = irb->Base.Height - (y + height * ctx->Pixel.ZoomY);
 229       y2 = irb->Base.Height - y;
 230    }
 231    vertices[0][0] = x;
 232    vertices[0][1] = y1;
 233    vertices[1][0] = x + width * ctx->Pixel.ZoomX;
 234    vertices[1][1] = y1;
 235    vertices[2][0] = x + width * ctx->Pixel.ZoomX;
 236    vertices[2][1] = y2;
 237    vertices[3][0] = x;
 238    vertices[3][1] = y2;
 239
 240    _mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
 241    _mesa_Enable(GL_VERTEX_ARRAY);
 242    meta_set_default_texrect(&intel->meta);
 243
 244    _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 245
 246    meta_restore_texcoords(&intel->meta);
 247    meta_restore_transform(&intel->meta);
 248
 249    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + old_active_texture);
 250    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, old_fb_name);
 251
 252    _mesa_PopClientAttrib();
 253    _mesa_PopAttrib();
 254
 255    _mesa_DeleteTextures(1, &texname);
 256    _mesa_DeleteFramebuffersEXT(1, &fb_name);
 257    _mesa_DeleteRenderbuffersEXT(1, &rb_name);
 258
 259    return GL_TRUE;
 260 }
 261
 262 void
 263 intelDrawPixels(GLcontext * ctx,
 264                 GLint x, GLint y,
 265                 GLsizei width, GLsizei height,
 266                 GLenum format,
 267                 GLenum type,
 268                 const struct gl_pixelstore_attrib *unpack,
 269                 const GLvoid * pixels)
 270 {
 271    if (intel_stencil_drawpixels(ctx, x, y, width, height, format, type,
 272                                 unpack, pixels))
 273       return;
 274
 275    _mesa_meta_draw_pixels(ctx, x, y, width, height, format, type,
 276                           unpack, pixels);
 277 }