Implement shadow samplers and dFdx(), dFdy() code generation.

6 files changed, 120 insertions, 70 deletions

diff --git a/src/mesa/shader/slang/library/slang_fragment_builtin.gc b/src/mesa/shader/slang/library/slang_fragment_builtin.gc
index 1c099a673b3..034672370ae 100644
--- a/src/mesa/shader/slang/library/slang_fragment_builtin.gc
+++ b/src/mesa/shader/slang/library/slang_fragment_builtin.gc
@@ -120,28 +120,48 @@ vec4 texture3DProj(const sampler3D sampler, const vec4 coord, const float bias)
 
 vec4 textureCube(const samplerCube sampler, const vec3 coord, const float bias)
 {
-   __asm vec4_texcube __retVal, sampler, coord, bias;
+   vec4 coord4;
+   coord4.xyz = coord;
+   coord4.w = bias;
+   __asm vec4_texcube __retVal, sampler, coord4;
 }
 
 
+// For shadow textures, we use the regular tex instructions since they should
+// do the depth comparison step.
+
 vec4 shadow1D(const sampler1DShadow sampler, const vec3 coord, const float bias)
 {
-   __asm vec4_shad1d __retVal, sampler, coord, bias;
+   vec4 coord4;
+   coord4.xyz = coord;
+   coord4.w = bias;
+   __asm vec4_texb1d __retVal, sampler, coord4;
 }
 
 vec4 shadow1DProj(const sampler1DShadow sampler, const vec4 coord, const float bias)
 {
-    return shadow1D (sampler, vec3 (coord.s / coord.q, 0.0, coord.p / coord.q), bias);
+   vec4 pcoord;
+   pcoord.x = coord.x / coord.w;
+   pcoord.z = coord.z;
+   pcoord.w = bias;
+   __asm vec4_texb1d __retVal, sampler, pcoord;
 }
 
 vec4 shadow2D(const sampler2DShadow sampler, const vec3 coord, const float bias)
 {
-   __asm vec4_shad2d __retVal, sampler, coord, bias;
+   vec4 coord4;
+   coord4.xyz = coord;
+   coord4.w = bias;
+   __asm vec4_texb2d __retVal, sampler, coord4;
 }
 
 vec4 shadow2DProj(const sampler2DShadow sampler, const vec4 coord, const float bias)
 {
-   return shadow2D (sampler, vec3 (coord.s / coord.q, coord.t / coord.q, coord.p / coord.q), bias);
+   vec4 pcoord;
+   pcoord.xy = coord.xy / coord.w;
+   pcoord.z = coord.z;
+   pcoord.w = bias;
+   __asm vec4_texb2d __retVal, sampler, pcoord;
 }
 
 
@@ -152,59 +172,67 @@ vec4 shadow2DProj(const sampler2DShadow sampler, const vec4 coord, const float b
 // 8.8 Fragment Processing Functions
 //
 
-float dFdx (float p) {
-    // XXX:
-    return 0.001;
+float dFdx(const float p)
+{
+   __asm vec4_ddx __retVal.x, p.xxxx;
 }
 
-vec2 dFdx (vec2 p) {
-    // XXX:
-    return vec2 (0.001);
+vec2 dFdx(const vec2 p)
+{
+   __asm vec4_ddx __retVal.xy, p.xyyy;
 }
 
-vec3 dFdx (vec3 p) {
-    // XXX:
-    return vec3 (0.001);
+vec3 dFdx(const vec3 p)
+{
+   __asm vec4_ddx __retVal.xyz, p.xyzz;
 }
 
-vec4 dFdx (vec4 p) {
-    // XXX:
-    return vec4 (0.001);
+vec4 dFdx(const vec4 p)
+{
+   __asm vec4_ddx __retVal, p;
 }
 
-float dFdy (float p) {
-    // XXX:
-    return 0.001;
+float dFdy(const float p)
+{
+   __asm vec4_ddy __retVal.x, p.xxxx;
 }
 
-vec2 dFdy (vec2 p) {
-    // XXX:
-    return vec2 (0.001);
+vec2 dFdy(const vec2 p)
+{
+   __asm vec4_ddy __retVal.xy, p.xyyy;
 }
 
-vec3 dFdy (vec3 p) {
-    // XXX:
-    return vec3 (0.001);
+vec3 dFdy(const vec3 p)
+{
+   __asm vec4_ddy __retVal.xyz, p.xyzz;
 }
 
-vec4 dFdy (vec4 p) {
-    // XXX:
-    return vec4 (0.001);
+vec4 dFdy(const vec4 p)
+{
+   __asm vec4_ddy __retVal, p;
 }
 
-float fwidth (float p) {
-    return abs (dFdx (p)) + abs (dFdy (p));
+float fwidth (const float p)
+{
+   // XXX hand-write with __asm
+   return abs(dFdx(p)) + abs(dFdy(p));
 }
 
-vec2 fwidth (vec2 p) {
-    return abs (dFdx (p)) + abs (dFdy (p));
+vec2 fwidth(const vec2 p)
+{
+   // XXX hand-write with __asm
+   return abs(dFdx(p)) + abs(dFdy(p));
 }
 
-vec3 fwidth (vec3 p) {
-    return abs (dFdx (p)) + abs (dFdy (p));
+vec3 fwidth(const vec3 p)
+{
+   // XXX hand-write with __asm
+   return abs(dFdx(p)) + abs(dFdy(p));
 }
 
-vec4 fwidth (vec4 p) {
-    return abs (dFdx (p)) + abs (dFdy (p));
+vec4 fwidth(const vec4 p)
+{
+   // XXX hand-write with __asm
+   return abs(dFdx(p)) + abs(dFdy(p));
 }
 
diff --git a/src/mesa/shader/slang/library/slang_fragment_builtin_gc.h b/src/mesa/shader/slang/library/slang_fragment_builtin_gc.h
index a7249ea561d..8b8202ea2f9 100644
--- a/src/mesa/shader/slang/library/slang_fragment_builtin_gc.h
+++ b/src/mesa/shader/slang/library/slang_fragment_builtin_gc.h
@@ -52,36 +52,48 @@
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diff --git a/src/mesa/shader/slang/slang_assemble.c b/src/mesa/shader/slang/slang_assemble.c
index 3995f0f31fb..05574d0e561 100644
--- a/src/mesa/shader/slang/slang_assemble.c
+++ b/src/mesa/shader/slang/slang_assemble.c
@@ -756,6 +756,8 @@ static const struct
    {"vec4_texcube", slang_asm_vec4_texcube, slang_asm_none},
    {"vec4_shad1d", slang_asm_vec4_shad1d, slang_asm_none},
    {"vec4_shad2d", slang_asm_vec4_shad2d, slang_asm_none},
+   {"vec4_ddx", 0, slang_asm_none},
+   {"vec4_ddy", 0, slang_asm_none},
     /* GL_MESA_shader_debug */
    {"float_print", slang_asm_float_deref, slang_asm_float_print},
    {"int_print", slang_asm_int_deref, slang_asm_int_print},
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 968fdcdd16c..79261ee29a6 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -619,6 +619,8 @@ static slang_asm_info AsmInfo[] = {
    { "vec4_frac", IR_FRAC, 1, 1 },
    { "vec4_abs", IR_ABS, 1, 1 },
    { "vec4_negate", IR_NEG, 1, 1 },
+   { "vec4_ddx", IR_DDX, 1, 1 },
+   { "vec4_ddy", IR_DDY, 1, 1 },
    /* float binary op */
    { "float_add", IR_ADD, 1, 2 },
    { "float_subtract", IR_SUB, 1, 2 },
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index c62a07d97a1..87a3f3f337c 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -77,6 +77,8 @@ static slang_ir_info IrInfo[] = {
    { IR_FRAC, "IR_FRAC", OPCODE_FRC, 4, 1 },
    { IR_ABS, "IR_ABS", OPCODE_ABS, 4, 1 },
    { IR_NEG, "IR_NEG", 0/*spec case*/, 4, 1 },
+   { IR_DDX, "IR_DDX", OPCODE_DDX, 4, 1 },
+   { IR_DDX, "IR_DDY", OPCODE_DDX, 4, 1 },
    { IR_SIN, "IR_SIN", OPCODE_SIN, 1, 1 },
    { IR_COS, "IR_COS", OPCODE_COS, 1, 1 },
    /* other */
@@ -701,6 +703,8 @@ emit(slang_gen_context *gc, slang_ir_node *n, struct gl_program *prog)
    case IR_ABS:
    case IR_SIN:
    case IR_COS:
+   case IR_DDX:
+   case IR_DDY:
       return emit_unop(gc, n, prog);
    case IR_TEX:
    case IR_TEXB:
diff --git a/src/mesa/shader/slang/slang_ir.h b/src/mesa/shader/slang/slang_ir.h
index 273964a8f06..b106e85dbb5 100644
--- a/src/mesa/shader/slang/slang_ir.h
+++ b/src/mesa/shader/slang/slang_ir.h
@@ -74,6 +74,8 @@ typedef enum
    IR_FRAC,
    IR_ABS,     /* absolute value */
    IR_NEG,     /* negate */
+   IR_DDX,     /* derivative w.r.t. X */
+   IR_DDY,     /* derivative w.r.t. Y */
    IR_SIN,     /* sine */
    IR_COS,     /* cosine */
    IR_NOT,     /* logical not */