Refactor runner and installation scripts for improved functionality

- Removed the `--disable-hiprt` flag from the runner command, simplifying the rendering options for users.
- Updated the `jiggablend-runner` script and README to reflect the removal of the HIPRT control flag, enhancing clarity in usage instructions.
- Enhanced the installation script to provide clearer examples for running the jiggablend manager and runner, improving user experience during setup.
- Implemented a more robust GPU backend detection mechanism, allowing for better compatibility with various hardware configurations.

internal/runner/tasks/processor.go

@@ -11,8 +11,6 @@ import (
 	"jiggablend/pkg/executils"
 	"jiggablend/pkg/types"
 	"os/exec"
-	"strconv"
-	"strings"
 	"sync"
 	"time"
 )
@@ -43,23 +41,25 @@ type Context struct {
 
 	// GPULockedOut is set when the runner has detected a GPU error (e.g. HIP) and disables GPU for all jobs.
 	GPULockedOut bool
-	// HasHIP is true when the runner detected HIP (AMD) devices at startup. Used to force CPU for Blender < 4.x only when HIP is present.
-	HasHIP bool
-	// GPUDetectionFailed is true when startup GPU backend detection could not run; we force CPU for all versions (could not determine HIP vs NVIDIA).
+	// HasAMD is true when the runner detected AMD devices at startup.
+	HasAMD bool
+	// HasNVIDIA is true when the runner detected NVIDIA GPUs at startup.
+	HasNVIDIA bool
+	// HasIntel is true when the runner detected Intel GPUs (e.g. Arc) at startup.
+	HasIntel bool
+	// GPUDetectionFailed is true when startup GPU backend detection could not run; we force CPU for all versions (backend availability unknown).
 	GPUDetectionFailed bool
 	// OnGPUError is called when a GPU error line is seen in render logs; typically sets runner GPU lockout.
 	OnGPUError func()
 	// ForceCPURendering is a runner-level override that forces CPU rendering for all jobs.
 	ForceCPURendering bool
-	// DisableHIPRT is a runner-level override that disables HIPRT acceleration in Blender.
-	DisableHIPRT bool
 }
 
 // ErrJobCancelled indicates the manager-side job was cancelled during execution.
 var ErrJobCancelled = errors.New("job cancelled")
 
 // NewContext creates a new task context. frameEnd should be >= frame; if 0 or less than frame, it is treated as single-frame (frameEnd = frame).
-// gpuLockedOut is the runner's current GPU lockout state; hasHIP means the runner has HIP (AMD) devices (force CPU for Blender < 4.x only when true); gpuDetectionFailed means detection failed at startup (force CPU for all versions—could not determine HIP vs NVIDIA); onGPUError is called when a GPU error is detected in logs (may be nil).
+// gpuLockedOut is the runner's current GPU lockout state; gpuDetectionFailed means detection failed at startup (force CPU for all versions); onGPUError is called when a GPU error is detected in logs (may be nil).
 func NewContext(
 	taskID, jobID int64,
 	jobName string,
@@ -75,10 +75,11 @@ func NewContext(
 	encoder *encoding.Selector,
 	processes *executils.ProcessTracker,
 	gpuLockedOut bool,
-	hasHIP bool,
+	hasAMD bool,
+	hasNVIDIA bool,
+	hasIntel bool,
 	gpuDetectionFailed bool,
 	forceCPURendering bool,
-	disableHIPRT bool,
 	onGPUError func(),
 ) *Context {
 	if frameEnd < frameStart {
@@ -101,10 +102,11 @@ func NewContext(
 		Encoder:            encoder,
 		Processes:          processes,
 		GPULockedOut:       gpuLockedOut,
-		HasHIP:             hasHIP,
+		HasAMD:             hasAMD,
+		HasNVIDIA:          hasNVIDIA,
+		HasIntel:           hasIntel,
 		GPUDetectionFailed: gpuDetectionFailed,
 		ForceCPURendering:  forceCPURendering,
-		DisableHIPRT:       disableHIPRT,
 		OnGPUError:         onGPUError,
 	}
 }
@@ -187,8 +189,7 @@ func (c *Context) ShouldEnableExecution() bool {
 }
 
 // ShouldForceCPU returns true if GPU should be disabled and CPU rendering forced
-// (runner GPU lockout, GPU detection failed at startup for any version, metadata force_cpu,
-// or Blender < 4.x when the runner has HIP).
+// (runner GPU lockout, GPU detection failed at startup, or metadata force_cpu).
 func (c *Context) ShouldForceCPU() bool {
 	if c.ForceCPURendering {
 		return true
@@ -196,17 +197,10 @@ func (c *Context) ShouldForceCPU() bool {
 	if c.GPULockedOut {
 		return true
 	}
-	// Detection failed at startup: we could not determine HIP vs NVIDIA, so force CPU for all versions.
+	// Detection failed at startup: backend availability unknown, so force CPU for all versions.
 	if c.GPUDetectionFailed {
 		return true
 	}
-	v := c.GetBlenderVersion()
-	major := parseBlenderMajor(v)
-	isPre4 := v != "" && major >= 0 && major < 4
-	// Blender < 4.x: force CPU when runner has HIP (no official HIP support).
-	if isPre4 && c.HasHIP {
-		return true
-	}
 	if c.Metadata != nil && c.Metadata.RenderSettings.EngineSettings != nil {
 		if v, ok := c.Metadata.RenderSettings.EngineSettings["force_cpu"]; ok {
 			if b, ok := v.(bool); ok && b {
@@ -217,21 +211,6 @@ func (c *Context) ShouldForceCPU() bool {
 	return false
 }
 
-// parseBlenderMajor returns the major version number from a string like "4.2.3" or "3.6".
-// Returns -1 if the version cannot be parsed.
-func parseBlenderMajor(version string) int {
-	version = strings.TrimSpace(version)
-	if version == "" {
-		return -1
-	}
-	parts := strings.SplitN(version, ".", 2)
-	major, err := strconv.Atoi(parts[0])
-	if err != nil {
-		return -1
-	}
-	return major
-}
-
 // IsJobCancelled checks whether the manager marked this job as cancelled.
 func (c *Context) IsJobCancelled() (bool, error) {
 	if c.Manager == nil {