src/mesa/drivers/dri/intel/intel_pixel.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/enums.h"
  29 #include "main/state.h"
  30 #include "main/context.h"
  31 #include "main/enable.h"
  32 #include "main/matrix.h"
  33 #include "main/viewport.h"
  34 #include "swrast/swrast.h"
  35 #include "shader/arbprogram.h"
  36 #include "shader/program.h"
  37
  38 #include "intel_context.h"
  39 #include "intel_pixel.h"
  40 #include "intel_regions.h"
  41
  42 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  43
  44 static GLenum
  45 effective_func(GLenum func, GLboolean src_alpha_is_one)
  46 {
  47    if (src_alpha_is_one) {
  48       if (func == GL_SRC_ALPHA)
  49          return GL_ONE;
  50       if (func == GL_ONE_MINUS_SRC_ALPHA)
  51          return GL_ZERO;
  52    }
  53
  54    return func;
  55 }
  56
  57 /**
  58  * Check if any fragment operations are in effect which might effect
  59  * glDraw/CopyPixels.
  60  */
  61 GLboolean
  62 intel_check_blit_fragment_ops(GLcontext * ctx, GLboolean src_alpha_is_one)
  63 {
  64    if (ctx->NewState)
  65       _mesa_update_state(ctx);
  66
  67    if (ctx->FragmentProgram._Enabled) {
  68       DBG("fallback due to fragment program\n");
  69       return GL_FALSE;
  70    }
  71
  72    if (ctx->Color.BlendEnabled &&
  73        (effective_func(ctx->Color.BlendSrcRGB, src_alpha_is_one) != GL_ONE ||
  74         effective_func(ctx->Color.BlendDstRGB, src_alpha_is_one) != GL_ZERO ||
  75         ctx->Color.BlendEquationRGB != GL_FUNC_ADD ||
  76         effective_func(ctx->Color.BlendSrcA, src_alpha_is_one) != GL_ONE ||
  77         effective_func(ctx->Color.BlendDstA, src_alpha_is_one) != GL_ZERO ||
  78         ctx->Color.BlendEquationA != GL_FUNC_ADD)) {
  79       DBG("fallback due to blend\n");
  80       return GL_FALSE;
  81    }
  82
  83    if (ctx->Texture._EnabledUnits) {
  84       DBG("fallback due to texturing\n");
  85       return GL_FALSE;
  86    }
  87
  88    if (!(ctx->Color.ColorMask[0] &&
  89          ctx->Color.ColorMask[1] &&
  90          ctx->Color.ColorMask[2] &&
  91          ctx->Color.ColorMask[3])) {
  92       DBG("fallback due to color masking\n");
  93       return GL_FALSE;
  94    }
  95
  96    if (ctx->Color.AlphaEnabled) {
  97       DBG("fallback due to alpha\n");
  98       return GL_FALSE;
  99    }
 100
 101    if (ctx->Depth.Test) {
 102       DBG("fallback due to depth test\n");
 103       return GL_FALSE;
 104    }
 105
 106    if (ctx->Fog.Enabled) {
 107       DBG("fallback due to fog\n");
 108       return GL_FALSE;
 109    }
 110
 111    if (ctx->_ImageTransferState) {
 112       DBG("fallback due to image transfer\n");
 113       return GL_FALSE;
 114    }
 115
 116    if (ctx->Stencil._Enabled) {
 117       DBG("fallback due to image stencil\n");
 118       return GL_FALSE;
 119    }
 120
 121    if (ctx->RenderMode != GL_RENDER) {
 122       DBG("fallback due to render mode\n");
 123       return GL_FALSE;
 124    }
 125
 126    return GL_TRUE;
 127 }
 128
 129
 130 GLboolean
 131 intel_check_meta_tex_fragment_ops(GLcontext * ctx)
 132 {
 133    if (ctx->NewState)
 134       _mesa_update_state(ctx);
 135
 136    /* Some of _ImageTransferState (scale, bias) could be done with
 137     * fragment programs on i915.
 138     */
 139    return !(ctx->_ImageTransferState || ctx->Fog.Enabled ||     /* not done yet */
 140             ctx->Texture._EnabledUnits || ctx->FragmentProgram._Enabled);
 141 }
 142
 143 /* The intel_region struct doesn't really do enough to capture the
 144  * format of the pixels in the region.  For now this code assumes that
 145  * the region is a display surface and hence is either ARGB8888 or
 146  * RGB565.
 147  * XXX FBO: If we'd pass in the intel_renderbuffer instead of region, we'd
 148  * know the buffer's pixel format.
 149  *
 150  * \param format  as given to glDraw/ReadPixels
 151  * \param type  as given to glDraw/ReadPixels
 152  */
 153 GLboolean
 154 intel_check_blit_format(struct intel_region * region,
 155                         GLenum format, GLenum type)
 156 {
 157    if (region->cpp == 4 &&
 158        (type == GL_UNSIGNED_INT_8_8_8_8_REV ||
 159         type == GL_UNSIGNED_BYTE) && format == GL_BGRA) {
 160       return GL_TRUE;
 161    }
 162
 163    if (region->cpp == 2 &&
 164        type == GL_UNSIGNED_SHORT_5_6_5_REV && format == GL_BGR) {
 165       return GL_TRUE;
 166    }
 167
 168    if (INTEL_DEBUG & DEBUG_PIXEL)
 169       fprintf(stderr, "%s: bad format for blit (cpp %d, type %s format %s)\n",
 170               __FUNCTION__, region->cpp,
 171               _mesa_lookup_enum_by_nr(type), _mesa_lookup_enum_by_nr(format));
 172
 173    return GL_FALSE;
 174 }
 175
 176 void
 177 intel_meta_set_passthrough_transform(struct intel_context *intel)
 178 {
 179    GLcontext *ctx = &intel->ctx;
 180
 181    intel->meta.saved_vp_x = ctx->Viewport.X;
 182    intel->meta.saved_vp_y = ctx->Viewport.Y;
 183    intel->meta.saved_vp_width = ctx->Viewport.Width;
 184    intel->meta.saved_vp_height = ctx->Viewport.Height;
 185    intel->meta.saved_matrix_mode = ctx->Transform.MatrixMode;
 186
 187    intel->internal_viewport_call = GL_TRUE;
 188    _mesa_Viewport(0, 0, ctx->DrawBuffer->Width, ctx->DrawBuffer->Height);
 189    intel->internal_viewport_call = GL_FALSE;
 190
 191    _mesa_MatrixMode(GL_PROJECTION);
 192    _mesa_PushMatrix();
 193    _mesa_LoadIdentity();
 194    _mesa_Ortho(0, ctx->DrawBuffer->Width, 0, ctx->DrawBuffer->Height, 1, -1);
 195
 196    _mesa_MatrixMode(GL_MODELVIEW);
 197    _mesa_PushMatrix();
 198    _mesa_LoadIdentity();
 199 }
 200
 201 void
 202 intel_meta_restore_transform(struct intel_context *intel)
 203 {
 204    _mesa_MatrixMode(GL_PROJECTION);
 205    _mesa_PopMatrix();
 206    _mesa_MatrixMode(GL_MODELVIEW);
 207    _mesa_PopMatrix();
 208
 209    _mesa_MatrixMode(intel->meta.saved_matrix_mode);
 210
 211    intel->internal_viewport_call = GL_TRUE;
 212    _mesa_Viewport(intel->meta.saved_vp_x, intel->meta.saved_vp_y,
 213                   intel->meta.saved_vp_width, intel->meta.saved_vp_height);
 214    intel->internal_viewport_call = GL_FALSE;
 215 }
 216
 217 /**
 218  * Set up a vertex program to pass through the position and first texcoord
 219  * for pixel path.
 220  */
 221 void
 222 intel_meta_set_passthrough_vertex_program(struct intel_context *intel)
 223 {
 224    GLcontext *ctx = &intel->ctx;
 225    static const char *vp =
 226       "!!ARBvp1.0\n"
 227       "TEMP vertexClip;\n"
 228       "DP4 vertexClip.x, state.matrix.mvp.row[0], vertex.position;\n"
 229       "DP4 vertexClip.y, state.matrix.mvp.row[1], vertex.position;\n"
 230       "DP4 vertexClip.z, state.matrix.mvp.row[2], vertex.position;\n"
 231       "DP4 vertexClip.w, state.matrix.mvp.row[3], vertex.position;\n"
 232       "MOV result.position, vertexClip;\n"
 233       "MOV result.texcoord[0], vertex.texcoord[0];\n"
 234       "MOV result.color, vertex.color;\n"
 235       "END\n";
 236
 237    assert(intel->meta.saved_vp == NULL);
 238
 239    _mesa_reference_vertprog(ctx, &intel->meta.saved_vp,
 240                             ctx->VertexProgram.Current);
 241    if (intel->meta.passthrough_vp == NULL) {
 242       GLuint prog_name;
 243       _mesa_GenPrograms(1, &prog_name);
 244       _mesa_BindProgram(GL_VERTEX_PROGRAM_ARB, prog_name);
 245       _mesa_ProgramStringARB(GL_VERTEX_PROGRAM_ARB,
 246                              GL_PROGRAM_FORMAT_ASCII_ARB,
 247                              strlen(vp), (const GLubyte *)vp);
 248       _mesa_reference_vertprog(ctx, &intel->meta.passthrough_vp,
 249                                ctx->VertexProgram.Current);
 250       _mesa_DeletePrograms(1, &prog_name);
 251    }
 252
 253    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 254    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 255                             intel->meta.passthrough_vp);
 256    ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 257                            &intel->meta.passthrough_vp->Base);
 258
 259    intel->meta.saved_vp_enable = ctx->VertexProgram.Enabled;
 260    _mesa_Enable(GL_VERTEX_PROGRAM_ARB);
 261 }
 262
 263 /**
 264  * Restores the previous vertex program after
 265  * intel_meta_set_passthrough_vertex_program()
 266  */
 267 void
 268 intel_meta_restore_vertex_program(struct intel_context *intel)
 269 {
 270    GLcontext *ctx = &intel->ctx;
 271
 272    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 273    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 274                             intel->meta.saved_vp);
 275    _mesa_reference_vertprog(ctx, &intel->meta.saved_vp, NULL);
 276    ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 277                            &ctx->VertexProgram.Current->Base);
 278
 279    if (!intel->meta.saved_vp_enable)
 280       _mesa_Disable(GL_VERTEX_PROGRAM_ARB);
 281 }
 282
 283 /**
 284  * Binds the given program string to GL_FRAGMENT_PROGRAM_ARB, caching the
 285  * program object.
 286  */
 287 void
 288 intel_meta_set_fragment_program(struct intel_context *intel,
 289                                 struct gl_fragment_program **prog,
 290                                 const char *prog_string)
 291 {
 292    GLcontext *ctx = &intel->ctx;
 293    assert(intel->meta.saved_fp == NULL);
 294
 295    _mesa_reference_fragprog(ctx, &intel->meta.saved_fp,
 296                             ctx->FragmentProgram.Current);
 297    if (*prog == NULL) {
 298       GLuint prog_name;
 299       _mesa_GenPrograms(1, &prog_name);
 300       _mesa_BindProgram(GL_FRAGMENT_PROGRAM_ARB, prog_name);
 301       _mesa_ProgramStringARB(GL_FRAGMENT_PROGRAM_ARB,
 302                              GL_PROGRAM_FORMAT_ASCII_ARB,
 303                              strlen(prog_string), (const GLubyte *)prog_string);
 304       _mesa_reference_fragprog(ctx, prog, ctx->FragmentProgram.Current);
 305       /* Note that DeletePrograms unbinds the program on us */
 306       _mesa_DeletePrograms(1, &prog_name);
 307    }
 308
 309    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 310    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, *prog);
 311    ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, &((*prog)->Base));
 312
 313    intel->meta.saved_fp_enable = ctx->FragmentProgram.Enabled;
 314    _mesa_Enable(GL_FRAGMENT_PROGRAM_ARB);
 315 }
 316
 317 /**
 318  * Restores the previous fragment program after
 319  * intel_meta_set_fragment_program()
 320  */
 321 void
 322 intel_meta_restore_fragment_program(struct intel_context *intel)
 323 {
 324    GLcontext *ctx = &intel->ctx;
 325
 326    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 327    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 328                             intel->meta.saved_fp);
 329    _mesa_reference_fragprog(ctx, &intel->meta.saved_fp, NULL);
 330    ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 331                            &ctx->FragmentProgram.Current->Base);
 332
 333    if (!intel->meta.saved_fp_enable)
 334       _mesa_Disable(GL_FRAGMENT_PROGRAM_ARB);
 335 }
 336
 337 void
 338 intelInitPixelFuncs(struct dd_function_table *functions)
 339 {
 340    functions->Accum = _swrast_Accum;
 341    if (!getenv("INTEL_NO_BLIT")) {
 342       functions->Bitmap = intelBitmap;
 343       functions->CopyPixels = intelCopyPixels;
 344       functions->DrawPixels = intelDrawPixels;
 345 #ifdef I915
 346       functions->ReadPixels = intelReadPixels;
 347 #endif
 348    }
 349 }
 350
 351 void
 352 intel_free_pixel_state(struct intel_context *intel)
 353 {
 354    GLcontext *ctx = &intel->ctx;
 355
 356    _mesa_reference_vertprog(ctx, &intel->meta.passthrough_vp, NULL);
 357    _mesa_reference_fragprog(ctx, &intel->meta.bitmap_fp, NULL);
 358 }
 359