91 lines
2.1 KiB
Plaintext
91 lines
2.1 KiB
Plaintext
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; Example PICA200 vertex shader
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; Uniforms
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.fvec projection[4], modelView[4]
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.fvec lightVec, lightHalfVec, lightClr, material[4]
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.alias mat_amb material[0]
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.alias mat_dif material[1]
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.alias mat_spe material[2]
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.alias mat_emi material[3]
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; Constants
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.constf myconst(0.0, 1.0, -1.0, -0.5)
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.alias zeros myconst.xxxx ; Vector full of zeros
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.alias ones myconst.yyyy ; Vector full of ones
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; Outputs
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.out outpos position
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.out outtc0 texcoord0
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.out outclr color
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; Inputs (defined as aliases for convenience)
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.alias inpos v0
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.alias intex v1
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.alias innrm v2
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.proc main
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; Force the w component of inpos to be 1.0
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mov r0.xyz, inpos
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mov r0.w, ones
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; r1 = modelView * inpos
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dp4 r1.x, modelView[0], r0
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dp4 r1.y, modelView[1], r0
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dp4 r1.z, modelView[2], r0
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dp4 r1.w, modelView[3], r0
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; outpos = projection * r1
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dp4 outpos.x, projection[0], r1
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dp4 outpos.y, projection[1], r1
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dp4 outpos.z, projection[2], r1
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dp4 outpos.w, projection[3], r1
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; outtex = intex
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mov outtc0, intex
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; Transform the normal vector with the modelView matrix
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; r1 = normalize(modelView * innrm)
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mov r0.xyz, innrm
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mov r0.w, zeros
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dp4 r1.x, modelView[0], r0
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dp4 r1.y, modelView[1], r0
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dp4 r1.z, modelView[2], r0
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mov r1.w, zeros
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dp3 r2, r1, r1 ; r2 = x^2+y^2+z^2 for each component
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rsq r2, r2 ; r2 = 1/sqrt(r2) ''
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mul r1, r2, r1 ; r1 = r1*r2
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; Calculate the diffuse level (r0.x) and the shininess level (r0.y)
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; r0.x = max(0, -(lightVec * r1))
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; r0.y = max(0, (-lightHalfVec[i]) * r1) ^ 2
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dp3 r0.x, lightVec, r1
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add r0.x, zeros, -r0
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dp3 r0.y, -lightHalfVec, r1
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max r0, zeros, r0
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mul r0.y, r0, r0
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; Accumulate the vertex color in r1, initializing it to the emission color
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mov r1, mat_emi
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; r1 += specularColor * lightClr * shininessLevel
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mul r2, lightClr, r0.yyyy
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mul r2, mat_spe, r2
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add r1, r2, r1
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; r1 += diffuseColor * lightClr * diffuseLevel
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mul r2, lightClr, r0.xxxx
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mul r2, mat_dif, r2
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add r1, r2, r1
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; r1 += ambientColor * lightClr
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mov r2, lightClr
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mul r2, mat_amb, r2
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add r1, r2, r1
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; outclr = clamp r1 to [0,1]
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min outclr, ones, r1
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; We're finished
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end
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.end
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