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/*

 * Copyright (C) 2004  David Airlie   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, sublicense,

 * 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 shall be included

 * in all copies or substantial portions 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 NONINFRINGEMENT.  IN NO EVENT SHALL

 * DAVID AIRLIE 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/colormac.h"

#include "main/macros.h"

#include "main/atifragshader.h"

#include "swrast/s_atifragshader.h"

#include "swrast/s_context.h"

/**

 * State for executing ATI fragment shader.

 */

struct atifs_machine

{

   GLfloat Registers[6][4];         /** six temporary registers */

   GLfloat PrevPassRegisters[6][4];

   GLfloat Inputs[2][4];   /** Primary, secondary input colors */

};

/**

 * Fetch a texel.

 */

static void

fetch_texel(struct gl_context * ctx, const GLfloat texcoord[4], GLfloat lambda,

	    GLuint unit, GLfloat color[4])

{

   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   /* XXX use a float-valued TextureSample routine here!!! */

   swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,

                               1, (const GLfloat(*)[4]) texcoord,

                               &lambda, (GLfloat (*)[4]) color);

}

static void

apply_swizzle(GLfloat values[4], GLuint swizzle)

{

   GLfloat s, t, r, q;

   s = values[0];

   t = values[1];

   r = values[2];

   q = values[3];

   switch (swizzle) {

   case GL_SWIZZLE_STR_ATI:

      values[0] = s;

      values[1] = t;

      values[2] = r;

      break;

   case GL_SWIZZLE_STQ_ATI:

      values[0] = s;

      values[1] = t;

      values[2] = q;

      break;

   case GL_SWIZZLE_STR_DR_ATI:

      values[0] = s / r;

      values[1] = t / r;

      values[2] = 1 / r;

      break;

   case GL_SWIZZLE_STQ_DQ_ATI:

/* make sure q is not 0 to avoid problems later with infinite values (texture lookup)? */

      if (q == 0.0F)

         q = 0.000000001F;

      values[0] = s / q;

      values[1] = t / q;

      values[2] = 1.0F / q;

      break;

   }

   values[3] = 0.0;

}

static void

apply_src_rep(GLint optype, GLuint rep, GLfloat * val)

{

   GLint i;

   GLint start, end;

   if (!rep)

      return;

   start = optype ? 3 : 0;

   end = 4;

   for (i = start; i < end; i++) {

      switch (rep) {

      case GL_RED:

	 val[i] = val[0];

	 break;

      case GL_GREEN:

	 val[i] = val[1];

	 break;

      case GL_BLUE:

	 val[i] = val[2];

	 break;

      case GL_ALPHA:

	 val[i] = val[3];

	 break;

      }

   }

}

static void

apply_src_mod(GLint optype, GLuint mod, GLfloat * val)

{

   GLint i;

   GLint start, end;

   if (!mod)

      return;

   start = optype ? 3 : 0;

   end = 4;

   for (i = start; i < end; i++) {

      if (mod & GL_COMP_BIT_ATI)

	 val[i] = 1 - val[i];

      if (mod & GL_BIAS_BIT_ATI)

	 val[i] = val[i] - 0.5F;

      if (mod & GL_2X_BIT_ATI)

	 val[i] = 2 * val[i];

      if (mod & GL_NEGATE_BIT_ATI)

	 val[i] = -val[i];

   }

}

static void

apply_dst_mod(GLuint optype, GLuint mod, GLfloat * val)

{

   GLint i;

   GLint has_sat = mod & GL_SATURATE_BIT_ATI;

   GLint start, end;

   mod &= ~GL_SATURATE_BIT_ATI;

   start = optype ? 3 : 0;

   end = optype ? 4 : 3;

   for (i = start; i < end; i++) {

      switch (mod) {

      case GL_2X_BIT_ATI:

	 val[i] = 2 * val[i];

	 break;

      case GL_4X_BIT_ATI:

	 val[i] = 4 * val[i];

	 break;

      case GL_8X_BIT_ATI:

	 val[i] = 8 * val[i];

	 break;

      case GL_HALF_BIT_ATI:

	 val[i] = val[i] * 0.5F;

	 break;

      case GL_QUARTER_BIT_ATI:

	 val[i] = val[i] * 0.25F;

	 break;

      case GL_EIGHTH_BIT_ATI:

	 val[i] = val[i] * 0.125F;

	 break;

      }

      if (has_sat) {

	 if (val[i] < 0.0F)

	    val[i] = 0.0F;

	 else if (val[i] > 1.0F)

	    val[i] = 1.0F;

      }

      else {

	 if (val[i] < -8.0F)

	    val[i] = -8.0F;

	 else if (val[i] > 8.0F)

	    val[i] = 8.0F;

      }

   }

}

static void

write_dst_addr(GLuint optype, GLuint mod, GLuint mask, GLfloat * src,

	       GLfloat * dst)

{

   GLint i;

   apply_dst_mod(optype, mod, src);

   if (optype == ATI_FRAGMENT_SHADER_COLOR_OP) {

      if (mask) {

	 if (mask & GL_RED_BIT_ATI)

	    dst[0] = src[0];

	 if (mask & GL_GREEN_BIT_ATI)

	    dst[1] = src[1];

	 if (mask & GL_BLUE_BIT_ATI)

	    dst[2] = src[2];

      }

      else {

	 for (i = 0; i < 3; i++)

	    dst[i] = src[i];

      }

   }

   else

      dst[3] = src[3];

}

static void

finish_pass(struct atifs_machine *machine)

{

   GLint i;

   for (i = 0; i < 6; i++) {

      COPY_4V(machine->PrevPassRegisters[i], machine->Registers[i]);

   }

}

struct ati_fs_opcode_st ati_fs_opcodes[] = {

   {GL_ADD_ATI, 2},

   {GL_SUB_ATI, 2},

   {GL_MUL_ATI, 2},

   {GL_MAD_ATI, 3},

   {GL_LERP_ATI, 3},

   {GL_MOV_ATI, 1},

   {GL_CND_ATI, 3},

   {GL_CND0_ATI, 3},

   {GL_DOT2_ADD_ATI, 3},

   {GL_DOT3_ATI, 2},

   {GL_DOT4_ATI, 2}

};

static void

handle_pass_op(struct atifs_machine *machine, struct atifs_setupinst *texinst,

	       const SWspan *span, GLuint column, GLuint idx)

{

   GLuint swizzle = texinst->swizzle;

   GLuint pass_tex = texinst->src;

   if (pass_tex >= GL_TEXTURE0_ARB && pass_tex <= GL_TEXTURE7_ARB) {

      pass_tex -= GL_TEXTURE0_ARB;

      COPY_4V(machine->Registers[idx],

	      span->array->attribs[FRAG_ATTRIB_TEX0 + pass_tex][column]);

   }

   else if (pass_tex >= GL_REG_0_ATI && pass_tex <= GL_REG_5_ATI) {

      pass_tex -= GL_REG_0_ATI;

      COPY_4V(machine->Registers[idx], machine->PrevPassRegisters[pass_tex]);

   }

   apply_swizzle(machine->Registers[idx], swizzle);

}

static void

handle_sample_op(struct gl_context * ctx, struct atifs_machine *machine,

		 struct atifs_setupinst *texinst, const SWspan *span,

		 GLuint column, GLuint idx)

{

/* sample from unit idx using texinst->src as coords */

   GLuint swizzle = texinst->swizzle;

   GLuint coord_source = texinst->src;

   GLfloat tex_coords[4] = { 0 };

   if (coord_source >= GL_TEXTURE0_ARB && coord_source <= GL_TEXTURE7_ARB) {

      coord_source -= GL_TEXTURE0_ARB;

      COPY_4V(tex_coords,

              span->array->attribs[FRAG_ATTRIB_TEX0 + coord_source][column]);

   }

   else if (coord_source >= GL_REG_0_ATI && coord_source <= GL_REG_5_ATI) {

      coord_source -= GL_REG_0_ATI;

      COPY_4V(tex_coords, machine->PrevPassRegisters[coord_source]);

   }

   apply_swizzle(tex_coords, swizzle);

   fetch_texel(ctx, tex_coords, 0.0F, idx, machine->Registers[idx]);

}

#define SETUP_SRC_REG(optype, i, x)		\

do {						\

   COPY_4V(src[optype][i], x); 			\

} while (0)

/**

 * Execute the given fragment shader.

 * NOTE: we do everything in single-precision floating point

 * \param ctx - rendering context

 * \param shader - the shader to execute

 * \param machine - virtual machine state

 * \param span - the SWspan we're operating on

 * \param column - which pixel [i] we're operating on in the span

 */

static void

execute_shader(struct gl_context *ctx, const struct ati_fragment_shader *shader,

	       struct atifs_machine *machine, const SWspan *span,

               GLuint column)

{

   GLuint pc;

   struct atifs_instruction *inst;

   struct atifs_setupinst *texinst;

   GLint optype;

   GLuint i;

   GLint j, pass;

   GLint dstreg;

   GLfloat src[2][3][4];

   GLfloat zeros[4] = { 0.0, 0.0, 0.0, 0.0 };

   GLfloat ones[4] = { 1.0, 1.0, 1.0, 1.0 };

   GLfloat dst[2][4], *dstp;

   for (pass = 0; pass < shader->NumPasses; pass++) {

      if (pass > 0)

	 finish_pass(machine);

      for (j = 0; j < MAX_NUM_FRAGMENT_REGISTERS_ATI; j++) {

	 texinst = &shader->SetupInst[pass][j];

	 if (texinst->Opcode == ATI_FRAGMENT_SHADER_PASS_OP)

	    handle_pass_op(machine, texinst, span, column, j);

	 else if (texinst->Opcode == ATI_FRAGMENT_SHADER_SAMPLE_OP)

	    handle_sample_op(ctx, machine, texinst, span, column, j);

      }

      for (pc = 0; pc < shader->numArithInstr[pass]; pc++) {

	 inst = &shader->Instructions[pass][pc];

	 /* setup the source registers for color and alpha ops */

	 for (optype = 0; optype < 2; optype++) {

 	    for (i = 0; i < inst->ArgCount[optype]; i++) {

	       GLint index = inst->SrcReg[optype][i].Index;

	       if (index >= GL_REG_0_ATI && index <= GL_REG_5_ATI)

		  SETUP_SRC_REG(optype, i,

				machine->Registers[index - GL_REG_0_ATI]);

	       else if (index >= GL_CON_0_ATI && index <= GL_CON_7_ATI) {

		  if (shader->LocalConstDef & (1 << (index - GL_CON_0_ATI))) {

		     SETUP_SRC_REG(optype, i,

				shader->Constants[index - GL_CON_0_ATI]);

		  } else {

		     SETUP_SRC_REG(optype, i,

				ctx->ATIFragmentShader.GlobalConstants[index - GL_CON_0_ATI]);

		  }

	       }

	       else if (index == GL_ONE)

		  SETUP_SRC_REG(optype, i, ones);

	       else if (index == GL_ZERO)

		  SETUP_SRC_REG(optype, i, zeros);

	       else if (index == GL_PRIMARY_COLOR_EXT)

		  SETUP_SRC_REG(optype, i,

				machine->Inputs[ATI_FS_INPUT_PRIMARY]);

	       else if (index == GL_SECONDARY_INTERPOLATOR_ATI)

		  SETUP_SRC_REG(optype, i,

				machine->Inputs[ATI_FS_INPUT_SECONDARY]);

	       apply_src_rep(optype, inst->SrcReg[optype][i].argRep,

			     src[optype][i]);

	       apply_src_mod(optype, inst->SrcReg[optype][i].argMod,

			     src[optype][i]);

	    }

	 }

	 /* Execute the operations - color then alpha */

	 for (optype = 0; optype < 2; optype++) {

	    if (inst->Opcode[optype]) {

	       switch (inst->Opcode[optype]) {

	       case GL_ADD_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   src[optype][0][i] + src[optype][1][i];

		     }

		  else

		     dst[optype][3] = src[optype][0][3] + src[optype][1][3];

		  break;

	       case GL_SUB_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   src[optype][0][i] - src[optype][1][i];

		     }

		  else

		     dst[optype][3] = src[optype][0][3] - src[optype][1][3];

		  break;

	       case GL_MUL_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   src[optype][0][i] * src[optype][1][i];

		     }

		  else

		     dst[optype][3] = src[optype][0][3] * src[optype][1][3];

		  break;

	       case GL_MAD_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   src[optype][0][i] * src[optype][1][i] +

			   src[optype][2][i];

		     }

		  else

		     dst[optype][3] =

			src[optype][0][3] * src[optype][1][3] +

			src[optype][2][3];

		  break;

	       case GL_LERP_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   src[optype][0][i] * src[optype][1][i] + (1 -

								    src

								    [optype]

								    [0][i]) *

			   src[optype][2][i];

		     }

		  else

		     dst[optype][3] =

			src[optype][0][3] * src[optype][1][3] + (1 -

								 src[optype]

								 [0][3]) *

			src[optype][2][3];

		  break;

	       case GL_MOV_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] = src[optype][0][i];

		     }

		  else

		     dst[optype][3] = src[optype][0][3];

		  break;

	       case GL_CND_ATI:

		  if (!optype) {

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   (src[optype][2][i] >

			    0.5) ? src[optype][0][i] : src[optype][1][i];

		     }

		  }

		  else {

		     dst[optype][3] =

			(src[optype][2][3] >

			 0.5) ? src[optype][0][3] : src[optype][1][3];

		  }

		  break;

	       case GL_CND0_ATI:

		  if (!optype)

		     for (i = 0; i < 3; i++) {

			dst[optype][i] =

			   (src[optype][2][i] >=

			    0) ? src[optype][0][i] : src[optype][1][i];

		     }

		  else {

		     dst[optype][3] =

			(src[optype][2][3] >=

			 0) ? src[optype][0][3] : src[optype][1][3];

		  }

		  break;

	       case GL_DOT2_ADD_ATI:

		  {

		     GLfloat result;

		     /* DOT 2 always uses the source from the color op */

		     /* could save recalculation of dot products for alpha inst */

		     result = src[0][0][0] * src[0][1][0] +

			src[0][0][1] * src[0][1][1] + src[0][2][2];

		     if (!optype) {

			for (i = 0; i < 3; i++) {

			   dst[optype][i] = result;

			}

		     }

		     else

			dst[optype][3] = result;

		  }

		  break;

	       case GL_DOT3_ATI:

		  {

		     GLfloat result;

		     /* DOT 3 always uses the source from the color op */

		     result = src[0][0][0] * src[0][1][0] +

			src[0][0][1] * src[0][1][1] +

			src[0][0][2] * src[0][1][2];

		     if (!optype) {

			for (i = 0; i < 3; i++) {

			   dst[optype][i] = result;

			}

		     }

		     else

			dst[optype][3] = result;

		  }

		  break;

	       case GL_DOT4_ATI:

		  {

		     GLfloat result;

		     /* DOT 4 always uses the source from the color op */

		     result = src[0][0][0] * src[0][1][0] +

			src[0][0][1] * src[0][1][1] +

			src[0][0][2] * src[0][1][2] +

			src[0][0][3] * src[0][1][3];

		     if (!optype) {

			for (i = 0; i < 3; i++) {

			   dst[optype][i] = result;

			}

		     }

		     else

			dst[optype][3] = result;

		  }

		  break;

	       }

	    }

	 }

	 /* write out the destination registers */

	 for (optype = 0; optype < 2; optype++) {

	    if (inst->Opcode[optype]) {

	       dstreg = inst->DstReg[optype].Index;

	       dstp = machine->Registers[dstreg - GL_REG_0_ATI];

	       if ((optype == 0) || ((inst->Opcode[1] != GL_DOT2_ADD_ATI) &&

		  (inst->Opcode[1] != GL_DOT3_ATI) && (inst->Opcode[1] != GL_DOT4_ATI)))

	          write_dst_addr(optype, inst->DstReg[optype].dstMod,

			      inst->DstReg[optype].dstMask, dst[optype],

			      dstp);

	       else

		  write_dst_addr(1, inst->DstReg[0].dstMod, 0, dst[1], dstp);

	    }

	 }

      }

   }

}

/**

 * Init fragment shader virtual machine state.

 */

static void

init_machine(struct gl_context * ctx, struct atifs_machine *machine,

	     const struct ati_fragment_shader *shader,

	     const SWspan *span, GLuint col)

{

   GLfloat (*inputs)[4] = machine->Inputs;

   GLint i, j;

   for (i = 0; i < 6; i++) {

      for (j = 0; j < 4; j++)

	 machine->Registers[i][j] = 0.0;

   }

   COPY_4V(inputs[ATI_FS_INPUT_PRIMARY], span->array->attribs[FRAG_ATTRIB_COL0][col]);

   COPY_4V(inputs[ATI_FS_INPUT_SECONDARY], span->array->attribs[FRAG_ATTRIB_COL1][col]);

}

/**

 * Execute the current ATI shader program, operating on the given span.

 */

void

_swrast_exec_fragment_shader(struct gl_context * ctx, SWspan *span)

{

   const struct ati_fragment_shader *shader = ctx->ATIFragmentShader.Current;

   struct atifs_machine machine;

   GLuint i;

   /* incoming colors should be floats */

   ASSERT(span->array->ChanType == GL_FLOAT);

   for (i = 0; i < span->end; i++) {

      if (span->array->mask[i]) {

	 init_machine(ctx, &machine, shader, span, i);

	 execute_shader(ctx, shader, &machine, span, i);

         /* store result color */

	 {

	    const GLfloat *colOut = machine.Registers[0];

            /*fprintf(stderr,"outputs %f %f %f %f\n",

              colOut[0], colOut[1], colOut[2], colOut[3]); */

            COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0][i], colOut);

	 }

      }

   }

}