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