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/matrix.h"
  40 #include "main/varray.h"
  41 #include "main/attrib.h"
  42 #include "main/enable.h"
  43 #include "glapi/dispatch.h"
  44 #include "swrast/swrast.h"
  45
  46 #include "intel_screen.h"
  47 #include "intel_context.h"
  48 #include "intel_batchbuffer.h"
  49 #include "intel_blit.h"
  50 #include "intel_buffers.h"
  51 #include "intel_regions.h"
  52 #include "intel_pixel.h"
  53 #include "intel_buffer_objects.h"
  54
  55
  56 static GLboolean
  57 intel_texture_drawpixels(GLcontext * ctx,
  58                          GLint x, GLint y,
  59                          GLsizei width, GLsizei height,
  60                          GLenum format,
  61                          GLenum type,
  62                          const struct gl_pixelstore_attrib *unpack,
  63                          const GLvoid *pixels)
  64 {
  65    GLuint texname;
  66    GLfloat vertices[4][4];
  67    GLfloat texcoords[4][2];
  68
  69    /* We're going to mess with texturing with no regard to existing texture
  70     * state, so if there is some set up we have to bail.
  71     */
  72    if (ctx->Texture._EnabledUnits != 0)
  73       return GL_FALSE;
  74
  75    /* Can't do textured DrawPixels with a fragment program, unless we were
  76     * to generate a new program that sampled our texture and put the results
  77     * in the fragment color before the user's program started.
  78     */
  79    if (ctx->FragmentProgram.Enabled)
  80       return GL_FALSE;
  81
  82    /* Don't even want to think about it */
  83    if (format == GL_COLOR_INDEX)
  84       return GL_FALSE;
  85
  86    /* We don't have a way to generate fragments with stencil values which *
  87     * will set the resulting stencil value.
  88     */
  89    if (format == GL_STENCIL_INDEX)
  90       return GL_FALSE;
  91
  92    /* To do DEPTH_COMPONENT, we would need to change our setup to not draw to
  93     * the color buffer, and sample the texture values into the fragment depth
  94     * in a program.
  95     */
  96    if (format == GL_DEPTH_COMPONENT)
  97       return GL_FALSE;
  98
  99    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT | GL_TEXTURE_BIT |
 100                     GL_CURRENT_BIT);
 101    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 102
 103    /* XXX: pixel store stuff */
 104    _mesa_Disable(GL_POLYGON_STIPPLE);
 105
 106    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 107    _mesa_Enable(GL_TEXTURE_2D);
 108    _mesa_GenTextures(1, &texname);
 109    _mesa_BindTexture(GL_TEXTURE_2D, texname);
 110    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 111    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 112    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 113    /*
 114    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
 115    _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
 116    */
 117    _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, format,
 118                     type, pixels);
 119
 120    _mesa_MatrixMode(GL_PROJECTION);
 121    _mesa_PushMatrix();
 122    _mesa_LoadIdentity();
 123    _mesa_Ortho(0, ctx->DrawBuffer->Width, 0, ctx->DrawBuffer->Height, 1, -1);
 124
 125    _mesa_MatrixMode(GL_MODELVIEW);
 126    _mesa_PushMatrix();
 127    _mesa_LoadIdentity();
 128
 129    vertices[0][0] = x;
 130    vertices[0][1] = y;
 131    vertices[0][2] = ctx->Current.RasterPos[2];
 132    vertices[0][3] = ctx->Current.RasterPos[3];
 133    vertices[1][0] = x + width * ctx->Pixel.ZoomX;
 134    vertices[1][1] = y;
 135    vertices[1][2] = ctx->Current.RasterPos[2];
 136    vertices[1][3] = ctx->Current.RasterPos[3];
 137    vertices[2][0] = x + width * ctx->Pixel.ZoomX;
 138    vertices[2][1] = y + height * ctx->Pixel.ZoomY;
 139    vertices[2][2] = ctx->Current.RasterPos[2];
 140    vertices[2][3] = ctx->Current.RasterPos[3];
 141    vertices[3][0] = x;
 142    vertices[3][1] = y + height * ctx->Pixel.ZoomY;
 143    vertices[3][2] = ctx->Current.RasterPos[2];
 144    vertices[3][3] = ctx->Current.RasterPos[3];
 145
 146    texcoords[0][0] = 0.0;
 147    texcoords[0][1] = 0.0;
 148    texcoords[1][0] = 1.0;
 149    texcoords[1][1] = 0.0;
 150    texcoords[2][0] = 1.0;
 151    texcoords[2][1] = 1.0;
 152    texcoords[3][0] = 0.0;
 153    texcoords[3][1] = 1.0;
 154
 155    _mesa_VertexPointer(4, GL_FLOAT, 4 * sizeof(GLfloat), &vertices);
 156    _mesa_TexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &texcoords);
 157    _mesa_Enable(GL_VERTEX_ARRAY);
 158    _mesa_Enable(GL_TEXTURE_COORD_ARRAY);
 159    CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));
 160
 161    _mesa_MatrixMode(GL_PROJECTION);
 162    _mesa_PopMatrix();
 163    _mesa_MatrixMode(GL_MODELVIEW);
 164    _mesa_PopMatrix();
 165    _mesa_PopClientAttrib();
 166    _mesa_PopAttrib();
 167
 168    _mesa_DeleteTextures(1, &texname);
 169
 170    return GL_TRUE;
 171 }
 172
 173 void
 174 intelDrawPixels(GLcontext * ctx,
 175                 GLint x, GLint y,
 176                 GLsizei width, GLsizei height,
 177                 GLenum format,
 178                 GLenum type,
 179                 const struct gl_pixelstore_attrib *unpack,
 180                 const GLvoid * pixels)
 181 {
 182    if (intel_texture_drawpixels(ctx, x, y, width, height, format, type,
 183                                 unpack, pixels))
 184       return;
 185
 186    if (INTEL_DEBUG & DEBUG_PIXEL)
 187       _mesa_printf("%s: fallback to swrast\n", __FUNCTION__);
 188
 189    if (ctx->FragmentProgram._Current == ctx->FragmentProgram._TexEnvProgram) {
 190       /*
 191        * We don't want the i915 texenv program to be applied to DrawPixels.
 192        * This is really just a performance optimization (mesa will other-
 193        * wise happily run the fragment program on each pixel in the image).
 194        */
 195       struct gl_fragment_program *fpSave = ctx->FragmentProgram._Current;
 196    /* can't just set current frag prog to 0 here as on buffer resize
 197       we'll get new state checks which will segfault. Remains a hack. */
 198       ctx->FragmentProgram._Current = NULL;
 199       ctx->FragmentProgram._UseTexEnvProgram = GL_FALSE;
 200       ctx->FragmentProgram._Active = GL_FALSE;
 201       _swrast_DrawPixels( ctx, x, y, width, height, format, type,
 202                           unpack, pixels );
 203       ctx->FragmentProgram._Current = fpSave;
 204       ctx->FragmentProgram._UseTexEnvProgram = GL_TRUE;
 205       ctx->FragmentProgram._Active = GL_TRUE;
 206       _swrast_InvalidateState(ctx, _NEW_PROGRAM);
 207    }
 208    else {
 209       _swrast_DrawPixels( ctx, x, y, width, height, format, type,
 210                           unpack, pixels );
 211    }
 212 }