dri/intel/intel_pixel_draw.c

/**************************************************************************
 *
 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portionsalloc
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "main/glheader.h"
#include "main/enums.h"
#include "main/image.h"
#include "main/mtypes.h"
#include "main/macros.h"
#include "main/bufferobj.h"
#include "main/teximage.h"
#include "main/texenv.h"
#include "main/texobj.h"
#include "main/texstate.h"
#include "main/texparam.h"
#include "main/varray.h"
#include "main/attrib.h"
#include "main/enable.h"
#include "main/buffers.h"
#include "main/fbobject.h"
#include "main/renderbuffer.h"
#include "main/depth.h"
#include "main/hash.h"
#include "main/blend.h"
#include "glapi/dispatch.h"
#include "swrast/swrast.h"

#include "intel_screen.h"
#include "intel_context.h"
#include "intel_batchbuffer.h"
#include "intel_blit.h"
#include "intel_buffers.h"
#include "intel_regions.h"
#include "intel_pixel.h"
#include "intel_buffer_objects.h"
#include "intel_fbo.h"

static GLboolean
intel_texture_drawpixels(GLcontext * ctx,
			 GLint x, GLint y,
			 GLsizei width, GLsizei height,
			 GLenum format,
			 GLenum type,
			 const struct gl_pixelstore_attrib *unpack,
			 const GLvoid *pixels)
{
   struct intel_context *intel = intel_context(ctx);
   GLuint texname;
   GLfloat vertices[4][4];
   GLfloat texcoords[4][2];

   /* We're going to mess with texturing with no regard to existing texture
    * state, so if there is some set up we have to bail.
    */
   if (ctx->Texture._EnabledUnits != 0) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels() fallback: texturing enabled\n");
      return GL_FALSE;
   }

   /* Can't do textured DrawPixels with a fragment program, unless we were
    * to generate a new program that sampled our texture and put the results
    * in the fragment color before the user's program started.
    */
   if (ctx->FragmentProgram.Enabled) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels() fallback: fragment program enabled\n");
      return GL_FALSE;
   }

   /* We don't have a way to generate fragments with stencil values which *
    * will set the resulting stencil value.
    */
   if (format == GL_STENCIL_INDEX)
      return GL_FALSE;

   /* Check that we can load in a texture this big. */
   if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
       height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels() fallback: bitmap too large (%dx%d)\n",
		 width, height);
      return GL_FALSE;
   }

   /* To do DEPTH_COMPONENT, we would need to change our setup to not draw to
    * the color buffer, and sample the texture values into the fragment depth
    * in a program.
    */
   if (format == GL_DEPTH_COMPONENT) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr,
		 "glDrawPixels() fallback: format == GL_DEPTH_COMPONENT\n");
      return GL_FALSE;
   }

   _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
		    GL_CURRENT_BIT);
   _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);

   /* XXX: pixel store stuff */
   _mesa_Disable(GL_POLYGON_STIPPLE);

   _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
   _mesa_Enable(GL_TEXTURE_2D);
   _mesa_GenTextures(1, &texname);
   _mesa_BindTexture(GL_TEXTURE_2D, texname);
   _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
   /*
   _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
   _mesa_TexEnvf(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
   */
   _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, format,
		    type, pixels);

   intel_meta_set_passthrough_transform(intel);

   /* Create the vertex buffer based on the current raster pos.  The x and y
    * we're handed are ctx->Current.RasterPos[0,1] rounded to integers.
    * We also apply the depth.  However, the W component is already multiplied
    * into ctx->Current.RasterPos[0,1,2] and we can ignore it at this point.
    */
   vertices[0][0] = x;
   vertices[0][1] = y;
   vertices[0][2] = ctx->Current.RasterPos[2];
   vertices[0][3] = 1.0;
   vertices[1][0] = x + width * ctx->Pixel.ZoomX;
   vertices[1][1] = y;
   vertices[1][2] = ctx->Current.RasterPos[2];
   vertices[1][3] = 1.0;
   vertices[2][0] = x + width * ctx->Pixel.ZoomX;
   vertices[2][1] = y + height * ctx->Pixel.ZoomY;
   vertices[2][2] = ctx->Current.RasterPos[2];
   vertices[2][3] = 1.0;
   vertices[3][0] = x;
   vertices[3][1] = y + height * ctx->Pixel.ZoomY;
   vertices[3][2] = ctx->Current.RasterPos[2];
   vertices[3][3] = 1.0;

   texcoords[0][0] = 0.0;
   texcoords[0][1] = 0.0;
   texcoords[1][0] = 1.0;
   texcoords[1][1] = 0.0;
   texcoords[2][0] = 1.0;
   texcoords[2][1] = 1.0;
   texcoords[3][0] = 0.0;
   texcoords[3][1] = 1.0;

   _mesa_VertexPointer(4, GL_FLOAT, 4 * sizeof(GLfloat), &vertices);
   _mesa_TexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &texcoords);
   _mesa_Enable(GL_VERTEX_ARRAY);
   _mesa_Enable(GL_TEXTURE_COORD_ARRAY);
   CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));

   intel_meta_restore_transform(intel);
   _mesa_PopClientAttrib();
   _mesa_PopAttrib();

   _mesa_DeleteTextures(1, &texname);

   return GL_TRUE;
}

static GLboolean
intel_stencil_drawpixels(GLcontext * ctx,
			 GLint x, GLint y,
			 GLsizei width, GLsizei height,
			 GLenum format,
			 GLenum type,
			 const struct gl_pixelstore_attrib *unpack,
			 const GLvoid *pixels)
{
   struct intel_context *intel = intel_context(ctx);
   GLuint texname, rb_name, fb_name, old_fb_name;
   GLfloat vertices[4][2];
   GLfloat texcoords[4][2];
   struct intel_renderbuffer *irb;
   struct intel_renderbuffer *depth_irb;
   struct gl_renderbuffer *rb;
   struct gl_pixelstore_attrib old_unpack;
   GLstencil *stencil_pixels;
   int row;

   if (format != GL_STENCIL_INDEX)
      return GL_FALSE;

   /* If there's nothing to write, we're done. */
   if (ctx->Stencil.WriteMask[0] == 0)
      return GL_TRUE;

   /* Can't do a per-bit writemask while treating stencil as rgba data. */
   if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
		 "stencil mask enabled\n");
      return GL_FALSE;
   }

   /* We use FBOs for our wrapping of the depthbuffer into a color
    * destination.
    */
   if (!ctx->Extensions.EXT_framebuffer_object)
      return GL_FALSE;

   /* We're going to mess with texturing with no regard to existing texture
    * state, so if there is some set up we have to bail.
    */
   if (ctx->Texture._EnabledUnits != 0) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
		 "texturing enabled\n");
      return GL_FALSE;
   }

   /* Can't do textured DrawPixels with a fragment program, unless we were
    * to generate a new program that sampled our texture and put the results
    * in the fragment color before the user's program started.
    */
   if (ctx->FragmentProgram.Enabled) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
		 "fragment program enabled\n");
      return GL_FALSE;
   }

   /* Check that we can load in a texture this big. */
   if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
       height > (1 << (ctx->Const.MaxTextureLevels - 1))) {
      if (INTEL_DEBUG & DEBUG_FALLBACKS)
	 fprintf(stderr, "glDrawPixels(STENCIL_INDEX) fallback: "
		 "bitmap too large (%dx%d)\n",
		 width, height);
      return GL_FALSE;
   }

   _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
		    GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
   old_fb_name = ctx->DrawBuffer->Name;

   _mesa_Disable(GL_POLYGON_STIPPLE);
   _mesa_Disable(GL_DEPTH_TEST);
   _mesa_Disable(GL_STENCIL_TEST);

   /* Unpack the supplied stencil values into a ubyte buffer. */
   assert(sizeof(GLstencil) == sizeof(GLubyte));
   stencil_pixels = _mesa_malloc(width * height * sizeof(GLstencil));
   for (row = 0; row < height; row++) {
      GLvoid *source = _mesa_image_address2d(unpack, pixels,
					     width, height,
					     GL_COLOR_INDEX, type,
					     row, 0);
      _mesa_unpack_stencil_span(ctx, width, GL_UNSIGNED_BYTE,
				stencil_pixels +
				row * width * sizeof(GLstencil),
				type, source, unpack, ctx->_ImageTransferState);
   }

   /* Take the current depth/stencil renderbuffer, and make a new one wrapping
    * it which will be treated as GL_RGBA8 so we can render to it as a color
    * buffer.
    */
   depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
   irb = intel_create_renderbuffer(GL_RGBA8);
   rb = &irb->Base;
   irb->Base.Width = depth_irb->Base.Width;
   irb->Base.Height = depth_irb->Base.Height;
   intel_renderbuffer_set_region(irb, depth_irb->region);

   /* Create a name for our renderbuffer, which lets us use other mesa
    * rb functions for convenience.
    */
   _mesa_GenRenderbuffersEXT(1, &rb_name);
   irb->Base.RefCount++;
   _mesa_HashInsert(ctx->Shared->RenderBuffers, rb_name, &irb->Base);

   /* Bind the new renderbuffer to the color attachment point. */
   _mesa_GenFramebuffersEXT(1, &fb_name);
   _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb_name);
   _mesa_FramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
				    GL_COLOR_ATTACHMENT0_EXT,
				    GL_RENDERBUFFER_EXT,
				    rb_name);
   /* Choose to render to the color attachment. */
   _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);

   _mesa_DepthMask(GL_FALSE);
   _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);

   _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
   _mesa_Enable(GL_TEXTURE_2D);
   _mesa_GenTextures(1, &texname);
   _mesa_BindTexture(GL_TEXTURE_2D, texname);
   _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   _mesa_TexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
   old_unpack = ctx->Unpack;
   ctx->Unpack = ctx->DefaultPacking;
   _mesa_TexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0,
		    GL_RED, GL_UNSIGNED_BYTE, stencil_pixels);
   ctx->Unpack = old_unpack;
   _mesa_free(stencil_pixels);

   intel_meta_set_passthrough_transform(intel);

   vertices[0][0] = x;
   vertices[0][1] = y;
   vertices[1][0] = x + width * ctx->Pixel.ZoomX;
   vertices[1][1] = y;
   vertices[2][0] = x + width * ctx->Pixel.ZoomX;
   vertices[2][1] = y + height * ctx->Pixel.ZoomY;
   vertices[3][0] = x;
   vertices[3][1] = y + height * ctx->Pixel.ZoomY;

   texcoords[0][0] = 0.0;
   texcoords[0][1] = 0.0;
   texcoords[1][0] = 1.0;
   texcoords[1][1] = 0.0;
   texcoords[2][0] = 1.0;
   texcoords[2][1] = 1.0;
   texcoords[3][0] = 0.0;
   texcoords[3][1] = 1.0;

   _mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
   _mesa_TexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &texcoords);
   _mesa_Enable(GL_VERTEX_ARRAY);
   _mesa_Enable(GL_TEXTURE_COORD_ARRAY);
   CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));

   intel_meta_restore_transform(intel);

   _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, old_fb_name);

   _mesa_PopClientAttrib();
   _mesa_PopAttrib();

   _mesa_DeleteTextures(1, &texname);
   _mesa_DeleteFramebuffersEXT(1, &fb_name);
   _mesa_DeleteRenderbuffersEXT(1, &rb_name);

   return GL_TRUE;
}

void
intelDrawPixels(GLcontext * ctx,
                GLint x, GLint y,
                GLsizei width, GLsizei height,
                GLenum format,
                GLenum type,
                const struct gl_pixelstore_attrib *unpack,
                const GLvoid * pixels)
{
   if (intel_texture_drawpixels(ctx, x, y, width, height, format, type,
				unpack, pixels))
      return;

   if (intel_stencil_drawpixels(ctx, x, y, width, height, format, type,
				unpack, pixels))
      return;

   if (INTEL_DEBUG & DEBUG_PIXEL)
      _mesa_printf("%s: fallback to swrast\n", __FUNCTION__);

   if (ctx->FragmentProgram._Current == ctx->FragmentProgram._TexEnvProgram) {
      /*
       * We don't want the i915 texenv program to be applied to DrawPixels.
       * This is really just a performance optimization (mesa will other-
       * wise happily run the fragment program on each pixel in the image).
       */
      struct gl_fragment_program *fpSave = ctx->FragmentProgram._Current;
   /* can't just set current frag prog to 0 here as on buffer resize
      we'll get new state checks which will segfault. Remains a hack. */
      ctx->FragmentProgram._Current = NULL;
      ctx->FragmentProgram._UseTexEnvProgram = GL_FALSE;
      ctx->FragmentProgram._Active = GL_FALSE;
      _swrast_DrawPixels( ctx, x, y, width, height, format, type,
                          unpack, pixels );
      ctx->FragmentProgram._Current = fpSave;
      ctx->FragmentProgram._UseTexEnvProgram = GL_TRUE;
      ctx->FragmentProgram._Active = GL_TRUE;
      _swrast_InvalidateState(ctx, _NEW_PROGRAM);
   }
   else {
      _swrast_DrawPixels( ctx, x, y, width, height, format, type,
                          unpack, pixels );
   }
}